chore: bump version to 1.16

- 修复备份自身应用时 force-stop 导致闪退（加入 context.packageName 排除）
- 流式备份重写：放弃 FIFO + --stdin，改用临时目录 + 标准 restic backup，支持 SMB/WebDAV
- 流式备份目录结构改为 per-app 子目录，与普通备份兼容
- 配置页新增「导入配置」按钮（importConfig）
- 修复导入配置后密码丢失（密码占位符 stored-in-keystore 未从 PasswordManager 恢复）
- 修复 RestoreScreen 恢复操作缺少 cacheDir/backendDomain 配置
- 修复 REST 桥 HEAD /config 在 SMB 下假阴性（回退到 download 确认）
- 修复 isArchiveSafe 安全检测拒绝 /data/data/ 和 /data/user_de/ 路径
- 修正流式备份中 zstd 二进制路径（cacheDir.parentFile 少一层 files/）
- loadResticSnapshot/loadResticAppDetails 兼容新旧流式备份目录结构
- 新增 BackupViewModel、BackendExecutor、PasswordManager 等文件

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,33 @@
+---
+name: Bug 报告
+about: 报告一个 Bug 帮助我们改进
+title: '[Bug] '
+labels: bug
+assignees: ''
+---
+
+**问题描述**
+清晰简洁地描述这个 Bug。
+
+**复现步骤**
+1. 打开应用...
+2. 点击...
+3. 看到错误...
+
+**预期行为**
+您期望发生什么。
+
+**实际行为**
+实际发生了什么。
+
+**截图/日志**
+如有错误截图或 logcat 输出，请附在此处。
+
+**环境信息**
+- 应用版本: [如 v1.14]
+- 设备型号: [如 Pixel 6]
+- Android 版本: [如 Android 14]
+- Root 方案: [Magisk / KernelSU / APatch / 无]
+
+**其他信息**
+任何可能有助于诊断问题的其他信息。

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,99 @@
+name: Bug 报告
+description: 报告一个 Bug 帮助我们改进
+title: "[Bug] "
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        感谢您花时间报告这个问题！请尽可能详细地填写以下信息。
+
+  - type: textarea
+    id: description
+    attributes:
+      label: 问题描述
+      description: 清晰简洁地描述这个 Bug 是什么
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: 复现步骤
+      description: 复现该问题的具体步骤
+      placeholder: |
+        1. 打开应用...
+        2. 点击...
+        3. 看到错误...
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: 预期行为
+      description: 您期望发生什么
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: 实际行为
+      description: 实际发生了什么
+    validations:
+      required: true
+
+  - type: textarea
+    id: screenshot
+    attributes:
+      label: 截图/日志
+      description: 如有错误截图或 logcat 输出，请附在这里
+    validations:
+      required: false
+
+  - type: input
+    id: version
+    attributes:
+      label: 应用版本
+      description: 您正在使用的版本号（可在设置中查看）
+      placeholder: "v1.14"
+    validations:
+      required: true
+
+  - type: input
+    id: device
+    attributes:
+      label: 设备型号
+      placeholder: "Pixel 6 / Xiaomi 14"
+    validations:
+      required: true
+
+  - type: input
+    id: android
+    attributes:
+      label: Android 版本
+      placeholder: "Android 14"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: root
+    attributes:
+      label: Root 方案
+      options:
+        - Magisk
+        - KernelSU
+        - APatch
+        - 其他
+        - 无 Root
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: 其他信息
+      description: 任何可能有助于诊断问题的其他信息
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: 讨论区
+    url: https://github.com/sakuradairong/android-backup-gui/discussions
+    about: 如需提问或讨论功能，请使用 Discussion

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,19 @@
+---
+name: 功能请求
+about: 为这个项目提一个新功能建议
+title: '[Feature] '
+labels: enhancement
+assignees: ''
+---
+
+**使用场景**
+这个功能解决了什么问题？在什么场景下需要？
+
+**期望方案**
+您期望的行为或交互方式是什么样的。
+
+**替代方案**
+您考虑过其他替代方案吗？
+
+**附加信息**
+如有截图、参考实现或其他上下文，请附在此处。

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,43 @@
+name: 功能请求
+description: 为这个项目提一个新功能建议
+title: "[Feature] "
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        感谢您花时间提出改进建议！请描述您想要的功能。
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: 使用场景
+      description: 这个功能解决了什么问题？在什么场景下需要？
+      placeholder: "当我使用...功能时，发现...不够方便"
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: 期望方案
+      description: 您期望的行为或交互方式是什么样的
+      placeholder: "希望在某某页面添加一个...按钮，点击后..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: 替代方案
+      description: 您考虑过其他替代方案吗？
+    validations:
+      required: false
+
+  - type: textarea
+    id: context
+    attributes:
+      label: 附加信息
+      description: 如有截图、参考实现或其他上下文，请附在这里
+    validations:
+      required: false

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,30 @@
+## 变更摘要
+
+<!-- 简要描述此 PR 的变更内容 -->
+
+## 关联 Issue
+
+<!-- 如果有，请关联相关的 Issue（如 Fixes #123）-->
+
+## 变更类型
+
+- [ ] Bug 修复
+- [ ] 新功能
+- [ ] 重构/代码优化
+- [ ] 文档更新
+- [ ] 测试
+- [ ] 其他
+
+## 测试清单
+
+- [ ] `./gradlew lint` 通过
+- [ ] `./gradlew test` 通过
+- [ ] 已在真机/模拟器上测试
+
+## 截图（如有 UI 变更）
+
+<!-- UI 变更请附上前后对比截图 -->
+
+## 其他说明
+
+<!-- 任何需要 reviewer 了解的额外信息 -->

.github/workflows/ci.yml

@@ -24,6 +24,8 @@ jobs:
 
       - name: Lint
         run: ./gradlew lint
+      - name: Test
+        run: ./gradlew test
 
       - name: Build release APK
         run: ./gradlew assembleRelease

.gitignore

@@ -21,4 +21,5 @@ release.keystore
 memory:*
 
 # Restic test repository (contains encryption keys)
-test/
+/test/
+kmboxnet

.omp/lsp.json

@@ -0,0 +1,12 @@
+{
+  "servers": {
+    "kotlin-lsp": {
+      "command": "kotlin-language-server",
+      "args": [],
+      "fileTypes": [".kt", ".kts"],
+      "rootMarkers": ["build.gradle", "settings.gradle"],
+      "warmupTimeoutMs": 60000
+    }
+  },
+  "idleTimeoutMs": 600000
+}

.pi/wow.yaml

@@ -0,0 +1,10 @@
+# Project-level wow-pi configuration for android-backup-gui
+contexts:
+  - AGENTS.md
+  - docs/contexts/*.md
+
+inject:
+  enabled: true
+  overrideExisting: false
+  envFiles:
+    - .env

AGENTS.md

@@ -1,7 +1,7 @@
 <!-- gitnexus:start -->
 # GitNexus — Code Intelligence
 
-This project is indexed by GitNexus as **android-backup-gui** (922 symbols, 2334 relationships, 79 execution flows). Use the GitNexus MCP tools to understand code, assess impact, and navigate safely.
+This project is indexed by GitNexus as **android-backup-gui** (1734 symbols, 4049 relationships, 110 execution flows). Use the GitNexus MCP tools to understand code, assess impact, and navigate safely.
 
 > If any GitNexus tool warns the index is stale, run `npx gitnexus analyze` in terminal first.
 

CLAUDE.md

@@ -1,7 +1,7 @@
 <!-- gitnexus:start -->
 # GitNexus — Code Intelligence
 
-This project is indexed by GitNexus as **android-backup-gui** (922 symbols, 2334 relationships, 79 execution flows). Use the GitNexus MCP tools to understand code, assess impact, and navigate safely.
+This project is indexed by GitNexus as **android-backup-gui** (1734 symbols, 4049 relationships, 110 execution flows). Use the GitNexus MCP tools to understand code, assess impact, and navigate safely.
 
 > If any GitNexus tool warns the index is stale, run `npx gitnexus analyze` in terminal first.
 

CODE_OF_CONDUCT.md

@@ -0,0 +1,39 @@
+# 贡献者公约行为准则
+
+## 我们的承诺
+
+为了营造一个开放、友好的环境，我们作为贡献者和维护者承诺：无论年龄、体型、残疾、种族、性别认同与表达、经验水平、国籍、个人外貌、种族、宗教或性取向如何，参与我们的项目和社区的每个人都不会受到骚扰。
+
+## 我们的标准
+
+有助于营造积极环境的行为包括：
+
+- 使用友好和包容的语言
+- 尊重不同的观点和经验
+- 优雅地接受建设性批评
+- 关注对社区最有利的事情
+- 对其他社区成员表示同理心
+
+不可接受的行为包括：
+
+- 使用带有性暗示的语言或图像，以及不受欢迎的性关注或挑逗
+- 挑衅、侮辱/贬损性评论，以及人身或政治攻击
+- 公开或私下骚扰
+- 未经明确许可发布他人的私人信息（如地址或电子邮件）
+- 在专业环境中可能被合理认为不合适的其他行为
+
+## 我们的责任
+
+项目维护者有责任明确可接受行为的标准，并应对任何不可接受行为采取适当和公平的纠正措施。
+
+## 适用范围
+
+本行为准则适用于项目空间和公共空间，当个人代表项目或其社区时同样适用。
+
+## 执行
+
+如有滥用、骚扰或其他不可接受行为，请联系项目团队。所有投诉将得到审查和调查，并将给出必要且适当的回应。
+
+## 归属
+
+本行为准则改编自 [Contributor Covenant](https://www.contributor-covenant.org) 2.1 版，可在 https://www.contributor-covenant.org/version/2/1/code_of_conduct.html 查看。

CONTRIBUTING.md

@@ -0,0 +1,103 @@
+# 贡献指南
+
+感谢您对 **Android Backup GUI** 的关注！欢迎通过 Issue 和 Pull Request 参与贡献。
+
+## 目录
+
+- [开发环境](#开发环境)
+- [构建项目](#构建项目)
+- [提交 Issue](#提交-issue)
+- [提交 Pull Request](#提交-pull-request)
+- [代码风格](#代码风格)
+
+## 开发环境
+
+- **JDK**: 17+
+- **Android SDK**: API 34（targetSdk 34, minSdk 24）
+- **IDE**: Android Studio Hedgehog+ 或 IntelliJ IDEA
+- **Gradle**: 8.2（通过 Gradle Wrapper 自动使用）
+
+### 首次构建
+
+```bash
+# 克隆仓库
+git clone https://github.com/sakuradairong/android-backup-gui.git
+cd android-backup-gui
+
+# 确认 Android SDK 路径（创建 local.properties 如果不存在）
+echo "sdk.dir=/path/to/Android/Sdk" > local.properties
+
+# 构建 debug APK
+./gradlew assembleDebug
+```
+
+## 构建项目
+
+```bash
+# 运行 lint 检查
+./gradlew lint
+
+# 运行单元测试
+./gradlew test
+
+# 构建 release APK（需配置签名）
+./gradlew assembleRelease
+```
+
+> **注意**: Release 构建需要 `app/release.keystore` 文件，以及 `KEYSTORE_PASSWORD` 和 `KEY_PASSWORD` 环境变量。开发调试请使用 `assembleDebug`。
+
+## 提交 Issue
+
+### Bug 报告
+
+请确保包含以下信息：
+
+1. **设备信息**: Android 版本、设备型号、是否 root
+2. **环境**: restic 版本（如有）、root 方案（Magisk / KernelSU / APatch）
+3. **复现步骤**: 详细的操作步骤
+4. **预期行为**: 您期望发生什么
+5. **实际行为**: 实际发生了什么
+6. **日志**: 相关的 logcat 输出或错误截图
+
+### 功能请求
+
+请说明：
+
+1. **使用场景**: 这个功能解决什么问题
+2. **期望方案**: 期望的行为或交互方式
+3. **替代方案**: 您考虑过的其他方案
+
+## 提交 Pull Request
+
+1. **Fork** 本仓库
+2. 创建功能分支: `git checkout -b feature/your-feature`
+3. **确保代码通过 lint 和测试**:
+   ```bash
+   ./gradlew lint test
+   ```
+4. 提交变更:
+   ```bash
+   git commit -m "feat: 简洁描述变更内容"
+   ```
+5. 推送到您的 Fork: `git push origin feature/your-feature`
+6. 创建 Pull Request 到 `main` 分支
+
+### PR 要求
+
+- 每个 PR 专注于一个功能或修复
+- 提交信息遵循 [Conventional Commits](https://www.conventionalcommits.org/) 规范
+- 新增功能应包含对应的单元测试
+- UI 变更请在 PR 描述中附上截图
+- 确保 `./gradlew lint test` 通过
+
+## 代码风格
+
+- 使用 Kotlin 官方代码风格（Kotlin Coding Conventions）
+- 使用 `ktlint` 检查代码格式（`./gradlew lint` 包含）
+- compose 相关代码遵循 Jetpack Compose 编码规范
+- 命名使用直观的英文（不推荐拼音）
+- 对复杂逻辑编写简明注释
+
+## 许可
+
+贡献即表示您同意您的贡献将在 [GPL-3.0](LICENSE) 许可下发布。

LICENSE

@@ -0,0 +1,675 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
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+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
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+you modify it: responsibilities to respect the freedom of others.
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+
+  Developers that use the GNU GPL protect your rights with two steps:
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+  For the developers' and authors' protection, the GPL clearly explains
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+
+  Some devices are designed to deny users access to install or run
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+
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+
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+  "This License" refers to version 3 of the GNU General Public License.
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+

README.md

@@ -1,129 +1,155 @@
 # Android Backup GUI
 
-Android 应用备份与恢复工具，集成 [restic](https://restic.net/) 实现增量去重备份，支持 WebDAV / SMB 远程仓库。
+Android 应用备份与恢复工具，通过 **root 权限** 实现应用的完整备份（APK + 用户数据 + OBB + SSAID + 权限 + WiFi 配置），集成 [restic](https://restic.net/) 实现增量去重备份，支持 SMB / WebDAV 远程仓库。
 
 ## 功能
 
 - **应用扫描** — 自动列出第三方应用，支持系统应用白名单
-- **APK + 数据备份** — 备份 APK 文件、应用数据目录、OBB 数据、SSAID、权限、WiFi 配置
-- **并行备份/恢复** — 备份并发数 3（Semaphore(3)），恢复并发数 2（Semaphore(2)）
-- **存档完整性校验** — 备份后自动 zstd/gzip 校验数据归档
-- **restic 增量去重** — 内建 `librestic.so`（~24MB），支持本地和远端仓库
-- **远程后端** — WebDAV（如 123 云盘）/ SMB 协议，本地临时仓库 + 自动双向同步 + 进度回调
-- **配置持久化** — 仓库路径、密码、后端参数保存在 `backup_settings.conf`
-- **快照管理** — 初始化仓库、查看统计、按策略清理旧快照（保留 7 天/4 周/3 月）
-- **应用名显示** — 使用 `PackageManager` 解析应用名，优先显示中文名，回退包名
+- **APK + 数据备份** — 备份 APK 文件、应用数据目录、OBB 数据、SSAID、SSAID 广告标识、AppOps 权限、WiFi 配置
+- **多用户支持** — 从配置页选择 Android 用户（主用户 / 工作资料），持久化到配置文件
+- **并行备份/恢复** — 备份并发 3（Semaphore），恢复并发 2（Semaphore）
+- **存档完整性校验** — 备份后自动 zstd/gzip 校验 + tar 结构验证
+- **restic 增量去重** — 内建 `librestic.so`（~24MB），SSD 加密快照，增量备份
+- **远程后端** — 本地 REST 桥 + NanoHTTPD 将 SMB/WebDAV 协议翻译为 restic 可直接访问的 REST API
+- **流式备份** — FIFO 管道对接 `restic backup --stdin`，无需本地暂存
+- **配置持久化** — 仓库路径、密码、后端参数、目标用户保存在 `backup_settings.conf`
+- **快照管理** — 初始化、查看统计、按策略清理旧快照（保留 7 天/4 周/3 月）、解锁
+- **累积快照** — 从历史快照读取元数据，合并为增量累积备份
+- **应用名显示** — 备份时缓存应用名称到 `app_details.json`，已卸载应用也显示中文名
 
 ## 技术栈
 
-- Kotlin / Android SDK
-- [kotlinx-serialization](https://github.com/Kotlin/kotlinx.serialization)（JSON 解析，取代 org.json）
-- Coroutines + StateFlow（面向状态架构）
-- Android ViewModel + lifecycle-runtime-ktx
+- Kotlin / Android SDK (minSdk 24, targetSdk 34)
+- **Jetpack Compose + Material 3** UI
+- ViewModel + StateFlow + SharedFlow（面向状态架构）
+- kotlinx-serialization（JSON 解析）
 - restic 0.17+ 二进制（编译为 `librestic.so`）
 - sardine-android (WebDAV 客户端)
-- SMBJ (jcifs-ng) (SMB 客户端)
-- Material 3 UI
-- Root shell with Mutex + timeout (120s)
+- jcifs-ng (SMB 客户端)
+- NanoHTTPD（REST 桥服务器）
+- libsu（Magisk / KernelSU / APatch root shell）
+- Kotest + MockK（单元测试）
 
 ## 架构
 
 ```
-BackupFragment / RestoreFragment / ConfigFragment  (UI)
-       │                         │
-       │  viewModels()           │  observe StateFlow
-       ▼                         ▼
-ConfigViewModel                 ResticWrapper
-  └─ StateFlow<ConfigUiState>      ├── ResticBackup       (备份)
-                                   ├── ResticRestore      (恢复 + dump)
-                                   ├── ResticSnapshotOps  (快照列表)
-                                   ├── ResticMaintenance  (forget/prune/check/stats)
-                                   ├── ResticRepoInit     (init)
-                                   ├── ResticCommandRunner(进程执行)
-                                   ├── ResticEnvResolver  (环境变量)
-                                   ├── RemoteSyncManager  (同步编排)
-                                   └── RemoteTransport    (文件传输接口)
-                                         ├── WebdavTransport (sardine, 8KB 分块)
-                                         └── SmbTransport    (jcifs-ng, 8KB 分块 + 签名)
+┌─────────────────────────────────────────────┐
+│  UI 层 (Jetpack Compose + Material 3)       │
+│  AppScaffold → BackupScreen / RestoreScreen │
+│              / ConfigScreen                  │
+│              / ConfigViewModel (StateFlow)   │
+├─────────────────────────────────────────────┤
+│  业务逻辑层 (backup/)                        │
+│  BackupOperation   → root shell tar/cp      │
+│  RestoreOperation  → root shell pm install  │
+│  StreamingBackup   → FIFO pipe → restic     │
+│  ResticWrapper     → facade 委托给:          │
+│    ├── ResticBackup      (备份)              │
+│    ├── ResticRestore     (恢复 + dump)       │
+│    ├── ResticSnapshotOps (快照列表/forget)    │
+│    ├── ResticMaintenance (prune/check/stats) │
+│    └── ResticRepoInit    (init)              │
+│  ResticCommandRunner → ProcessBuilder       │
+│  ResticEnvResolver   → 环境变量构建           │
+│  RestBridgeRunner    → ResticRestBridge      │
+│  RemoteTransport     → file I/O 接口          │
+│    ├── WebdavTransport (sardine, 8KB 分块)    │
+│    └── SmbTransport (jcifs-ng, 8KB 分块)      │
+├─────────────────────────────────────────────┤
+│  Root 层 (root/)                             │
+│  RootShell → libsu (Magisk/KernelSU/APatch)  │
+├─────────────────────────────────────────────┤
+│  Service 层                                  │
+│  BackupService → Foreground Service          │
+├─────────────────────────────────────────────┤
+│  原生二进制 (jniLibs)                          │
+│  librestic.so / libtar_bin.so / libzstd_bin  │
+└─────────────────────────────────────────────┘
 ```
 
-### 数据流
+### 数据流（一次备份）
 
 ```
-1. BackupOperation.backupApps()  ─── 本地 APP 备份到 outputDir
-                                      │
-2. WifiManager.backup(outputDir)     WiFi 配置
-                                      │
-3. ResticWrapper.backup(paths=[outputDir])  ─── restic 快照
-       │
-       ├── RemoteSyncManager.withRemoteSync()
-       │     ├── syncFromRemote  (WebDAV/SMB: 下载远端差异)
-       │     ├── action()        (restic backup/restore 命令)
-       │     └── syncToRemote    (WebDAV/SMB: 上传本地差异)
-       │
-       └── RemoteTransport
-             ├── upload(download)
-             │     ├── onProgress(TransferProgress)      ← 阶段 ("connecting" / "transferring" / "completed")
-             │     └── onByteProgress(ByteProgress)      ← 8KB 粒度字节进度
-             │
-             └── protocol 实现: SmbTransport / WebdavTransport
+用户选择应用 → 扫描 (AppScanner.enumerateUsers / scanThirdParty)
+    ↓
+创建 Backup_ 目录 → 写入 appList.txt + app_details.json
+    ↓
+并行 (Semaphore=3) 为每个应用:
+    ├── 备份 APK (cp → app目录/包名.apk)
+    ├── 备份数据 (tar zstd → 包名_data.tar.zst)
+    ├── 备份 OBB (tar → 包名_obb.tar.zst)
+    ├── 备份 SSAID (提取 → ssaid.txt)
+    ├── 备份图标 (snapshot cache / aapt)
+    └── 备份权限 (dumpsys → permissions.txt)
+    ↓
+WiFi 备份 → WifiManager.backup()
+    ↓
+(可选) ResticWrapper.backup() → restic 快照到远程仓库
 ```
 
-### restic 远程仓库流程
+### 远程仓库（REST 桥模式）
 
 ```
-1. syncFromRemote: PROPFIND 递归列出远端文件 → 下载差异文件到本地临时仓库
-   → 发出 TransferProgress("list") / TransferProgress("download") / TransferProgress("delete_stale")
-2. runRestic: 在本地临时仓库执行 restic 命令 (backup / restore / snapshots / init ...)
-3. syncToRemote: 递归遍历本地临时仓库 → 上传差异文件到远端
-   → 发出 TransferProgress("upload") / TransferProgress("delete_stale") / TransferProgress("complete")
+Restic CLI ←→ ResticRestBridge (NanoHTTPD, 127.0.0.1:random)
+                      ↓
+              RemoteTransport (SMB/WebDAV)
 ```
 
-远端同步基于内容大小比较，跳过同名等长文件；自动删除远端/本地过时文件。
+restic 通过 REST HTTP API 与本地桥通信，桥接器将请求翻译为 SMB/WebDAV 文件操作。
+无需本地 staging 仓库，restic 直接读写远程存储。
 
-### 关键设计
+## 构建
 
-- **导航栏索引** — 使用 `FragmentPagerAdapter` + 三个子 Fragment
-- **href 自引用过滤** — WebDAV 服务器常将目录自身作为 PROPFIND 响应条目，通过比较资源 href 与请求 URL 精确过滤
-- **根目录 404 保护** — 根目录返回 404 视为致命错误（防止限流导致误删本地文件），子目录 404 安全跳过
-- **指数退避重试** — DNS 超时、5xx 错误、连接拒绝等瞬时故障自动重试（1s/2s/4s），最多 3 次
-- **双向递归同步** — BFS 遍历远端目录树，深度限制 3 层，适配 restic 仓库结构
-- **双向递归递归过滤** — 脏删除（walkLocalFile filter，适配临时仓库模式）
-- **SmbException 精确处理** — 区分 `STATUS_OBJECT_NAME_NOT_FOUND`(0xC0000034) / `STATUS_OBJECT_NAME_COLLISION`(0xC0000035)
-- **标签解析** — `PackageManager.getApplicationLabel()` 批量解析，无 root 需求，比 `dumpsys package` 快 10x+
-- **ConfigViewModel** — `StateFlow<ConfigUiState>` 驱动配置 UI，`viewModelScope` 管理 restic 操作生命周期
-- **进度回调线程安全** — TransferProgress 统一由 `withRemoteSync` 分派至 Main 线程；ByteProgress 留在 IO（8KB 粒度）
-- **并发安全性** — `RootShell` 使用 `Mutex` + `withTimeout(120s)`；远程同步使用 `Mutex`；`BackupOperation`/`RestoreOperation` 使用 `Semaphore` + `AtomicInteger`
-- **SMB 签名可选** — `smbSigning` 构造参数（默认 true），兼容旧 SMB 服务器
-- **文件大小限制** — WebDAV 上传 50MB 上限（防止 ByteArray OOM）
-- **存档完整性校验** — 备份后 zstd/gzip 验证数据归档，校验失败回告
+### 版本历史
 
-## 编译
+| 版本 | 更新内容 |
+|------|---------|
+| v1.14 | 修复 shell 转义/管道死锁/配置序列化缺陷，新增配置导出与 BackupConfig 单元测试 |
+| v1.13 | Compose Material 3 UI 重构、Unlock 支持、ResticBinary 启动初始化、修复 500 错误和刷新竞态 |
+| v1.12 | 引擎 + Compose Material 3 UI 重构 |
+| v1.11 | 构建系统改进、LSP 支持 |
+| v1.10 | 后端桥接稳定性提升 |
+| v1.9 | 远程后端优化 |
+| v1.8 | 快照管理增强 |
+| v1.7 | 多用户支持 |
+| v1.6 | 累积快照 |
+| v1.5 | 修复签名配置 |
+| v1.4 | APK 体积优化（R8 + shrinkResources），25MB → 11.8MB |
+| v1.3 | 累积快照、AppResult 类型化错误、kotlinx-serialization |
+
+### 编译命令
 
 ```bash
 # Debug APK
 ./gradlew assembleDebug
 
-# Release (需配置签名)
-./gradlew assembleRelease
+# Release APK（需配置签名）
+KEYSTORE_PASSWORD=<密码> KEY_PASSWORD=<密码> ./gradlew assembleRelease
 ```
 
-`librestic.so` 需放在 `app/src/main/jniLibs/arm64-v8a/` 目录下，在 `build.gradle` 中禁用 `extractNativeLibs` 前的 `useLegacyPackaging`。
+> Release 构建需要 `app/release.keystore`；原生库放在 `jniLibs/arm64-v8a/`。
 
 ## 使用说明
 
-1. Android 设备需具备 **root 权限**（用于 `pm path`、`dumpsys`、文件访问等）
-2. 在「设置」页签配置 restic 仓库参数（后端类型、URL、路径、密码）
-3. 点击「初始化」创建仓库（远程后端需 WebDAV/SMB 服务已运行）
-4. 在「备份」页签选择应用，点击「开始备份」
-5. 在「恢复」页签选择备份目录或 restic 快照，点击「开始恢复」
+1. Android 设备需 **root 权限**（Magisk / KernelSU / APatch）
+2. 在「配置」页签设置备份选项 + restic 仓库参数
+3. 切换「备份用户」选项（多用户设备）
+4. 在「备份」页签选择应用 → 开始备份
+5. 在「恢复」页签选择本地备份或 restic 快照 → 开始恢复
 
-### WebDAV 配置示例
+### 远程后端配置
 
-| 字段 | 值 |
-|------|-----|
-| 后端 | WebDAV |
-| 地址 | `https://webdav.123pan.cn/webdav` |
-| 用户名 | 手机号 |
-| 密码 | 应用密码 |
-| 仓库存放路径 | `back` |
+| 字段 | WebDAV 示例 | SMB 示例 |
+|------|-------------|----------|
+| 后端 | WebDAV | SMB |
+| 地址 | `https://webdav.example.com` | `192.168.1.165` |
+| 用户名 | 账号 | Windows 用户名 |
+| 密码 | 密码 | Windows 密码 |
+| 共享名称 | — | `back` |
+| 仓库存放路径 | `backup` | `backup` |
+
+### 注意事项
+
+- 应用卸载会清除 `backup_settings.conf`，建议定期导出配置
+- Restic 仓库需先「初始化」才能使用（自动检测已有仓库）
+- SMB 密码错误多次会导致 Windows 账户锁定，需在服务器上解锁

SECURITY.md

@@ -0,0 +1,24 @@
+# 安全策略
+
+## 支持的版本
+
+| 版本   | 支持状态          |
+|--------|-------------------|
+| v1.14  | ✅ 积极支持       |
+| v1.13  | ✅ 积极支持       |
+| < v1.13| ❌ 不再支持       |
+
+## 报告安全漏洞
+
+如果您发现安全漏洞，**请不要在 GitHub Issues 中公开披露**。请通过以下方式私下报告：
+
+1. 在仓库中创建一个 [Security Advisory](https://github.com/sakuradairong/android-backup-gui/security/advisories/new)
+2. 或发送邮件至（待设置，目前请使用 Security Advisory）
+
+我们会尽快确认并回应，通常在 **48 小时内**。
+
+### 安全注意事项
+
+- 本应用需要 root 权限运行，请确保从可信来源下载 APK
+- 备份数据使用 restic 加密存储，请妥善保管仓库密码
+- 如发现敏感信息泄露，请立即通过 Security Advisory 联系我们

accessibility-review-report.md

@@ -0,0 +1,303 @@
+# 无障碍审查报告 — Android Backup GUI
+
+**审查阶段**：第三层 — 可维护性与用户体验  
+**审查技能**：accessibility (WCAG 2.2)  
+**审查日期**：2026-06-06  
+**项目规模**：37 个源文件  
+**审查范围**：UI 相关 4 个 Fragment/Activity、4 个布局 XML、菜单、资源文件  
+
+---
+
+## 严重程度说明
+
+| 级别 | 定义 |
+|------|------|
+| **严重** | 用户无法完成核心操作，或屏幕阅读器完全无法识别交互元素 |
+| **高** | 严重阻碍无障碍使用，有合理的替代方案但未实现 |
+| **中** | 影响使用体验，但用户可通过变通方式完成任务 |
+| **低** | 体验可改进点，非阻塞性 |
+
+---
+
+## 发现汇总
+
+| # | 文件 | 行号 | 问题 | 严重程度 |
+|---|------|------|------|----------|
+| 1 | PackageListAdapter.kt | 61-69, 116 | `TextView` 模拟按钮(排除数据切换)缺少无障碍角色 | **严重** |
+| 2 | PackageListAdapter.kt | 76-88 | `MaterialCardView` 点击区域未合并无障碍语义 | **高** |
+| 3 | PackageListAdapter.kt | 52-53 | `CheckBox` 缺少对应应用的 `contentDescription` | **高** |
+| 4 | PackageListAdapter.kt | 109-115 | 排除数据切换状态未以文字方式通知 | **中** |
+| 5 | fragment_backup.xml | 168-169 | statusText 缺少无障碍实时区域 | **高** |
+| 6 | fragment_restore.xml | 90-91 | statusText 缺少无障碍实时区域 | **高** |
+| 7 | fragment_config.xml | 384-390 | configStatusText 缺少无障碍实时区域 | **高** |
+| 8 | fragment_backup.xml | 152-160 | progressBar 开始/结束状态无无障碍通知 | **中** |
+| 9 | fragment_restore.xml | 73-81 | progressBar 开始/结束状态无无障碍通知 | **中** |
+| 10 | fragment_backup.xml | 100-133 | 排序/全选按钮文本仅 11sp，不符合可缩放要求 | **中** |
+| 11 | fragment_backup.xml | 39-43 | "用户:" 标签与 Spinner 无程序化关联 | **中** |
+| 12 | fragment_backup.xml | 59-65 | "输出目录:" 标签与目录显示无程序化关联 | **低** |
+| 13 | fragment_restore.xml | 49-53 | "用户:" 标签与 Spinner 无程序化关联 | **中** |
+| 14 | PackageListAdapter.kt | 61-69 | "数据"文本排除切换触摸目标可能不足 48dp | **中** |
+| 15 | MainActivity.kt | 93-100 | BottomNavigation 缺少 `contentDescription` 仅凭图标导航 | **低** |
+
+---
+
+## 详细发现
+
+### 发现 1：`TextView` 模拟按钮 — 排除数据切换(严重)
+
+**文件**：`PackageListAdapter.kt`  
+**行号**：61-69（创建），116（点击监听器）  
+**问题**：使用 `TextView`（非标准按钮控件）实现点击交互。`TextView` 默认不向 TalkBack 宣告其可点击角色。屏幕阅读器用户听到"数据"但不知道可以点击切换。
+
+```kotlin
+// 第 61-69 行：创建
+val et = TextView(ctx).apply {
+    id = R.id.excludeToggle
+    // ...
+}
+
+// 第 116 行：添加点击
+toggle.setOnClickListener {
+    dataToggleCb(pkg, !excluded)
+}
+```
+
+**修复建议**：  
+- 方案A(最优)：改用 `MaterialButton` 或 `ImageButton` 替代 `TextView`，并设置 `contentDescription`。  
+- 方案B(最小改动)：在 `TextView` 上显式设置 `focusable = true`、`clickable = true`，并设置 `contentDescription` 说明其作用和状态。  
+- 添加 `stateDescription` 或更新 `contentDescription` 反映当前切换状态（"点击排除数据备份" / "点击包含数据备份"）。
+
+---
+
+### 发现 2：卡片点击区域无障碍语义缺失(高)
+
+**文件**：`PackageListAdapter.kt`  
+**行号**：76-88  
+**问题**：`MaterialCardView` 上设置了 `setOnClickListener` 用于切换 CheckBox，但 TalkBack 视卡片为一个独立可点击元素，未与内部 CheckBox 的角色合并。用户无法明确知道点击卡片的效果是切换选中状态。
+
+```kotlin
+// 第 76 行
+card.setOnClickListener {
+    val pos = holder.adapterPosition
+    // ... 切换 checkbox
+}
+```
+
+**修复建议**：  
+- 为卡片设置 `contentDescription` 关联应用名和选中状态。  
+- 或为卡片添加 `role = Role.Button` 的语义，合并内部子元素的无障碍信息。  
+- 最佳实践是在 `onBindViewHolder` 中更新卡片的 `contentDescription` 为"勾选 ${app.label}"或"取消勾选 ${app.label}"。
+
+---
+
+### 发现 3：CheckBox 缺少对应描述(高)
+
+**文件**：`PackageListAdapter.kt`  
+**行号**：52-53（创建），92-102（绑定）  
+**问题**：CheckBox 在代码中创建且未设置 `contentDescription`。虽然旁边有 `TextView` 显示应用名，但程序化关联不完善。
+
+```kotlin
+// 第 52-53 行
+val cb = CheckBox(ctx).apply {
+    id = R.id.checkbox
+    // 没有 contentDescription
+}
+```
+
+**修复建议**：在 `onBindViewHolder`（第 96 行设置 `textView.text` 之后）为 checkbox 设置 `contentDescription`：
+
+```kotlin
+holder.checkbox.contentDescription = "选择 ${app.label.ifEmpty { pkg }}"
+```
+
+当选中/取消时同步更新描述。
+
+---
+
+### 发现 4：排除数据切换状态缺少文字通知(中)
+
+**文件**：`PackageListAdapter.kt`  
+**行号**：109-115  
+**问题**：排除数据开关通过 `paintFlags`（删除线）和 `isSelected` 来表示状态，这些仅视觉变化不会被 TalkBack 识别。用户无法知道当前是否已排除数据。
+
+```kotlin
+// 第 109-115 行
+toggle.text = "数据"
+toggle.paintFlags = if (excluded) {
+    toggle.paintFlags or android.graphics.Paint.STRIKE_THRU_TEXT_FLAG
+} else {
+    toggle.paintFlags and android.graphics.Paint.STRIKE_THRU_TEXT_FLAG.inv()
+}
+toggle.isSelected = excluded
+```
+
+**修复建议**：显式更新 `contentDescription`：
+
+```kotlin
+toggle.contentDescription = if (excluded) {
+    "排除 ${app.label.ifEmpty { pkg }} 的用户数据备份"
+} else {
+    "包含 ${app.label.ifEmpty { pkg }} 的用户数据备份"
+}
+```
+
+---
+
+### 发现 5/6/7：状态文字缺少无障碍实时区域(高)
+
+**文件**：
+- `fragment_backup.xml` 第 168-169 行（statusText）
+- `fragment_restore.xml` 第 90-91 行（statusText）  
+- `fragment_config.xml` 第 384-390 行（configStatusText）
+
+**问题**：三个状态文字 View 均未设置 `accessibilityLiveRegion`。当代码调用 `updateStatus()` 或 `applyState()` 更新文本内容时，TalkBack 不会自动朗读变化。
+
+**修复建议**：在布局 XML 中添加：
+```xml
+android:accessibilityLiveRegion="polite"
+```
+
+同时，建议在 `BackupFragment.kt:406` 的 `updateStatus` 方法和 `ConfigFragment.kt:136` 设置状态文本后手动触发无障碍事件，确保 TalkBack 播报：
+```kotlin
+binding.statusText.sendAccessibilityEvent(
+    AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED
+)
+```
+
+---
+
+### 发现 8/9：进度指示器状态无通知(中)
+
+**文件**：
+- `fragment_backup.xml` 第 152-160 行（progressBar）
+- `fragment_restore.xml` 第 73-81 行（progressBar）
+
+**问题**：`LinearProgressIndicator` 的 `visibility` 在 `VISIBLE`/`GONE` 之间切换（`BackupFragment.kt:402`、`RestoreFragment.kt:395`），但 TalkBack 不会主动通知用户加载开始或结束。
+
+**修复建议**：在 `setRunning()` 方法中切换进度条可见性时，同步更新 `statusText` 并确保其 `accessibilityLiveRegion` 生效。例如在显示进度条时更新 statusText 为"正在加载…"，隐藏时更新为"加载完成"。
+
+---
+
+### 发现 10：排序/全选按钮文本过小(中)
+
+**文件**：`fragment_backup.xml`  
+**行号**：100-133  
+**问题**：排序和全选按钮的 `android:textSize` 设置为 `11sp`。
+
+```xml
+<Button android:textSize="11sp" ... />
+```
+
+`11sp` 远低于 Android 推荐的 `14sp` 最小可读文本大小。当用户开启大字模式时，文本可读性受影响。此外按钮使用 `layout_weight="1"` 分布宽度，在窄屏上按钮宽度可能不足 48dp。
+
+**修复建议**：  
+- 将文本大小提升至 `14sp` 以上。  
+- 添加 `android:minWidth="48dp"` 确保触摸区域不小于 48dp。  
+- 考虑使用图标+文字的紧凑布局替代纯文字小按钮。
+
+---
+
+### 发现 11/13："用户:" 标签缺少程序化关联(中)
+
+**文件**：
+- `fragment_backup.xml` 第 39-43 行
+- `fragment_restore.xml` 第 49-53 行
+
+**问题**："用户:" 是一个独立的 `TextView`，与后面的 `Spinner` 无程序化关联。TalkBack 用户需自行推断两者关系。
+
+**修复建议**：为 `TextView` 添加 `android:labelFor="@id/userSelector"` 属性：
+```xml
+<TextView
+    android:labelFor="@+id/userSelector"
+    ... />
+```
+
+---
+
+### 发现 12："输出目录:" 标签缺少程序化关联(低)
+
+**文件**：`fragment_backup.xml`  
+**行号**：59-65  
+
+**问题**："输出目录:" 标签之后是 `outputPathLabel`（显示路径的 TextView）和"修改"按钮。标签与路径显示之间无程序化关联。
+
+**修复建议**：为输出目录标签添加 `labelFor` 指向 `outputPathLabel`，或将其合并为带标题的可操作区域。
+
+---
+
+### 发现 14：排除数据切换触摸目标可能不足 48dp(中)
+
+**文件**：`PackageListAdapter.kt`  
+**行号**：61-69  
+
+**问题**："数据"文本是纯 `TextView`，没有设置 `minWidth` 或 `minHeight`。点击区域仅限于文本包裹范围，可能小于 Android 推荐的 48dp 最小触摸目标。
+
+```kotlin
+val et = TextView(ctx).apply {
+    id = R.id.excludeToggle
+    // 没有 minWidth/minHeight 或最小 padding 保证触摸区域
+}
+```
+
+**修复建议**：添加最小触摸尺寸：
+```kotlin
+val et = TextView(ctx).apply {
+    // ...
+    minWidth = resources.getDimensionPixelSize(
+        android.R.dimen.app_icon_size // 48dp
+    )
+    minimumHeight = resources.getDimensionPixelSize(
+        android.R.dimen.app_icon_size
+    )
+}
+```
+
+或改用 `MaterialButton` 替代。
+
+---
+
+### 发现 15：BottomNavigation 缺少 ContentDescription(低)
+
+**文件**：
+- `MainActivity.kt` 第 93-100 行  
+- `res/menu/bottom_nav.xml` 第 2-15 行
+
+**问题**：BottomNavigationView 的菜单项包含 `android:title` 文本，但 `android:icon` 引用图标(`@drawable/ic_backup` 等)未设置 `android:contentDescription`。虽然 `android:title` 可被 TalkBack 读取，但图标作为装饰元素应标记为 `android:importantForAccessibility="no"` 以避免冗余播报。
+
+**建议**：在菜单 XML 中为图标装饰属性添加声明（需在 menu 中设置 `app:iconContentDescription` 或在代码中设置）。不过由于 `labelVisibilityMode="labeled"`，title 总是可见的，TalkBack 可以通过 title 识别，此项优先级较低。
+
+---
+
+## 总结
+
+### 按严重程度统计
+
+| 严重程度 | 数量 |
+|----------|------|
+| 严重 | 1 |
+| 高 | 4 |
+| 中 | 8 |
+| 低 | 2 |
+| **总计** | **15** |
+
+### 按文件分布
+
+| 文件 | 发现问题数 | 最严重问题 |
+|------|-----------|-----------|
+| PackageListAdapter.kt | 5 | 严重 — TextView 模拟按钮 |
+| fragment_backup.xml | 5 | 高 — 缺少无障碍实时区域 |
+| fragment_restore.xml | 3 | 高 — 缺少无障碍实时区域 |
+| fragment_config.xml | 1 | 高 — 缺少无障碍实时区域 |
+| MainActivity.kt | 1 | 低 — BottomNavigation 图标描述 |
+
+### 最优先修复项（共 5 项）
+
+1. **PackageListAdapter.kt:61-69** — `TextView` 模拟按钮改为语义化按钮并添加 `contentDescription`
+2. **PackageListAdapter.kt:76-88** — 卡片点击区域合并无障碍信息，添加选中/未选中的状态文字
+3. **PackageListAdapter.kt:52-53** — CheckBox 绑定应用名作为 `contentDescription`
+4. **fragment_backup.xml:168, fragment_restore.xml:90, fragment_config.xml:385** — 为所有状态文字添加 `accessibilityLiveRegion="polite"`
+5. **PackageListAdapter.kt:109-115** — 排除切换状态同步到 `contentDescription`
+
+### 项目整体无障碍评估
+
+该应用大量使用 Material Design 3 标准组件，这些组件内置了基本无障碍支持（如 TalkBack 可识别 Button、Switch、CheckBox 等）。主要无障碍缺陷集中在**程序化创建的列表项**（`PackageListAdapter`）和**动态状态更新**缺乏通知机制。修复优先级建议从 PackageListAdapter 的 5 个问题开始，它们影响最核心的交互流程（应用选择和排除数据）。配置页面的无障碍支持较好（使用 TextInputLayout + hint 提供标签）。总体评分 **6/10**，完成上述修复后可提升至 **8/10**。

app/build.gradle

@@ -1,6 +1,21 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlinx-serialization'
+apply plugin: 'org.jetbrains.kotlinx.kover'
+
+kover {
+    reports {
+        filters {
+            excludes {
+                classes(
+                    "*.BuildConfig",
+                    "*.R",
+                    "*.R\$*"
+                )
+            }
+        }
+    }
+}
 
 android {
     namespace "com.example.androidbackupgui"
@@ -9,35 +24,45 @@ android {
         applicationId "com.example.androidbackupgui"
         minSdk 24
         targetSdk 34
-        versionCode 2
-        versionName "1.1"
+        versionCode 16
+        versionName "1.16"
     }
     buildFeatures {
-        viewBinding true
+        compose = true
+    }
+    composeOptions {
+        kotlinCompilerExtensionVersion = "1.5.1"
     }
     lint {
         disable 'QueryAllPackagesPermission'
     }
     signingConfigs {
         release {
-            def keystoreFile = file("release.keystore")
-            if (keystoreFile.exists()) {
-                storeFile keystoreFile
-                storePassword System.getenv("KEYSTORE_PASSWORD") ?: "android"
-                keyAlias "release"
-                keyPassword System.getenv("KEY_PASSWORD") ?: "android"
-            }
+            storeFile rootProject.file("app/release.keystore")
+            storePassword System.getenv("KEYSTORE_PASSWORD")
+            keyAlias "release"
+            keyPassword System.getenv("KEY_PASSWORD")
+            v1SigningEnabled true
+            v2SigningEnabled true
         }
     }
     buildTypes {
         release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
-            if (file("release.keystore").exists()) {
-                signingConfig signingConfigs.release
+            if (rootProject.file("app/release.keystore").exists()) {
+                def ksPass = System.getenv("KEYSTORE_PASSWORD")
+                def kPass = System.getenv("KEY_PASSWORD")
+                if (ksPass != null && kPass != null) {
+                    signingConfig signingConfigs.release
+                }
             }
         }
     }
+    testOptions {
+        unitTests.all {
+
+            useJUnitPlatform()
+        }
+    }
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17
         targetCompatibility JavaVersion.VERSION_17
@@ -49,27 +74,56 @@ android {
         jniLibs {
             useLegacyPackaging true
         }
+        resources {
+            excludes += [
+                'org/bouncycastle/pqc/crypto/picnic/lowmcL5.bin.properties',
+                'org/bouncycastle/pqc/crypto/picnic/lowmcL3.bin.properties',
+                'org/bouncycastle/pqc/crypto/picnic/lowmcL1.bin.properties',
+            ]
+        }
     }
 }
 
 dependencies {
+    // Compose BOM (manages all Compose library versions)
+    implementation platform('androidx.compose:compose-bom:2024.02.00')
+    implementation 'androidx.compose.material3:material3'
+    implementation 'androidx.compose.ui:ui'
+    implementation 'androidx.compose.ui:ui-tooling-preview'
+    implementation 'androidx.compose.foundation:foundation'
+    implementation 'androidx.compose.material:material-icons-extended'
+    implementation 'androidx.activity:activity-compose:1.8.2'
+    debugImplementation 'androidx.compose.ui:ui-tooling'
+
     implementation "org.jetbrains.kotlin:kotlin-stdlib:1.9.0"
     implementation 'androidx.core:core-ktx:1.12.0'
+    implementation 'androidx.security:security-crypto:1.1.0-alpha06'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'com.google.android.material:material:1.11.0'
-    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
     implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.7.0'
     implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.7.0'
-    implementation 'androidx.preference:preference-ktx:1.2.1'
-    implementation 'androidx.fragment:fragment-ktx:1.6.2'
-    implementation 'androidx.viewpager2:viewpager2:1.0.0'
+    implementation 'androidx.lifecycle:lifecycle-runtime-compose:2.7.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-compose:2.7.0'
     implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.3"
 
     // 方案A: jcifs-ng (SMB) + sardine-android (WebDAV) 替代 rclone serve
-    implementation "eu.agno3.jcifs:jcifs-ng:2.1.10"
-    implementation "com.github.thegrizzlylabs:sardine-android:v0.9"
+    implementation("eu.agno3.jcifs:jcifs-ng:2.1.10") {
+        exclude group: 'org.bouncycastle'
+    }
+    implementation("com.github.thegrizzlylabs:sardine-android:v0.9") {
+        exclude group: 'xpp3'
+        exclude group: 'stax'
+    }
     implementation "org.slf4j:slf4j-android:1.7.36"
 
     // root shell via libsu (Magisk/KernelSU/APatch)
     implementation 'com.github.topjohnwu:libsu:6.0.0'
+    // Full BouncyCastle provider (includes MD4 required by jcifs-ng SMB)
+    implementation 'org.bouncycastle:bcprov-jdk15to18:1.77'
+    implementation 'org.nanohttpd:nanohttpd:2.3.1'
+    testImplementation "io.kotest:kotest-runner-junit5:5.9.1"
+    testImplementation "io.kotest:kotest-assertions-core:5.9.1"
+    testImplementation "io.kotest:kotest-property:5.9.1"
+    testImplementation "io.mockk:mockk:1.13.12"
+    testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.3"
 }

app/proguard-rules.pro

@@ -1 +1,58 @@
-# Add project specific ProGuard rules here.
+# ProGuard/R8 rules for Android Backup GUI
+# ==========================================
+
+# --- kotlinx.serialization ---
+# Keep @SerialName classes and companion serializer fields
+-keepattributes *Annotation*, InnerClasses
+-dontnote kotlinx.serialization.AnnotationsKt
+-keepclassmembers class kotlinx.serialization.json.** {
+    *** Companion;
+}
+-keepclasseswithmembers class kotlinx.serialization.json.** {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+-keep,includedescriptorclasses class com.example.androidbackupgui.**$$serializer { *; }
+-keepclassmembers class com.example.androidbackupgui.** {
+    *** Companion;
+}
+-keepclasseswithmembers class com.example.androidbackupgui.** {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# --- NanoHTTPD ---
+# NanoHTTPD (package fi.iki.elonen despite Maven group org.nanohttpd)
+-keep class fi.iki.elonen.** { *; }
+
+# --- RemoteTransport (WebDAV/SMB) ---
+-keep class com.example.androidbackupgui.backup.RemoteTransport { *; }
+
+# --- Data classes (serialization) ---
+-keep class com.example.androidbackupgui.backup.ResticProgress { *; }
+-keep class com.example.androidbackupgui.backup.BackupSummary { *; }
+-keep class com.example.androidbackupgui.backup.ResticSnapshot { *; }
+-keep class com.example.androidbackupgui.backup.RestoreProgress { *; }
+-keep class com.example.androidbackupgui.backup.BackupConfig { *; }
+-keep class com.example.androidbackupgui.backup.AppError { *; }
+-keep class com.example.androidbackupgui.backup.AppResult { *; }
+
+
+# --- RemoteTransport implementations ---
+-keep class com.example.androidbackupgui.backup.SmbTransport { *; }
+-keep class com.example.androidbackupgui.backup.WebdavTransport { *; }
+
+# --- WifiManager (called from UI, kept for safety) ---
+-keep class com.example.androidbackupgui.backup.WifiManager { *; }
+# --- Keep data models used by kotlinx.serialization ---
+## Keep all model classes that may be referenced via @Serializable
+-keep class com.example.androidbackupgui.model.** { *; }
+
+# --- Keep R classes (referenced by code) ---
+-keep class com.example.androidbackupgui.R { *; }
+
+
+
+# --- jcifs-ng (SMB) — keep class/member names for reflection (was MD4Provider) ---
+-keep class jcifs.util.Crypto { *; }
+-keep class jcifs.smb.NtlmUtil { *; }
+-keep class jcifs.ntlmssp.Type3Message { *; }
+-keep class jcifs.smb.NtlmContext { *; }

app/src/main/AndroidManifest.xml

@@ -5,9 +5,12 @@
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
 
     <application
-        android:allowBackup="true"
+        android:allowBackup="false"
         android:extractNativeLibs="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
@@ -22,6 +25,11 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <service
+            android:name=".backup.BackupService"
+            android:exported="false"
+            android:foregroundServiceType="dataSync" />
     </application>
 
 </manifest>

app/src/main/java/com/example/androidbackupgui/MainActivity.kt

@@ -1,83 +1,49 @@
 package com.example.androidbackupgui
-
 import android.os.Bundle
-import androidx.appcompat.app.AppCompatActivity
-import androidx.core.view.ViewCompat
-import androidx.core.view.WindowCompat
-import androidx.core.view.WindowInsetsCompat
-import androidx.fragment.app.Fragment
-import androidx.lifecycle.lifecycleScope
-import androidx.fragment.app.FragmentActivity
-import androidx.viewpager2.adapter.FragmentStateAdapter
-import androidx.viewpager2.widget.ViewPager2
-import com.example.androidbackupgui.databinding.ActivityMainBinding
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.ui.Modifier
+import com.example.androidbackupgui.backup.LogUtil
+import com.example.androidbackupgui.backup.MissingAlgoProvider
+import com.example.androidbackupgui.backup.PasswordManager
+import com.example.androidbackupgui.backup.ResticBinary
+import com.example.androidbackupgui.backup.defaultResticWrapper
 import com.example.androidbackupgui.root.RootShell
-import com.example.androidbackupgui.ui.BackupFragment
-import com.example.androidbackupgui.ui.ConfigFragment
-import com.example.androidbackupgui.ui.RestoreFragment
+import com.example.androidbackupgui.ui.AppScaffold
+import com.example.androidbackupgui.ui.theme.AppTheme
 import com.google.android.material.color.DynamicColors
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-
-class MainActivity : AppCompatActivity() {
-
-    private lateinit var binding: ActivityMainBinding
-
-    private val pageTitles = listOf("应用备份", "应用恢复", "备份配置")
 
+class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
 
+        // Apply Dynamic Colors (Material You) if available
         DynamicColors.applyToActivitiesIfAvailable(application)
-        WindowCompat.setDecorFitsSystemWindows(window, false)
+        RootShell.configure()
 
-        binding = ActivityMainBinding.inflate(layoutInflater)
-        setContentView(binding.root)
+        // Initialize restic binary path
+        ResticBinary.prepare(this)?.let { defaultResticWrapper.binaryPath = it }
 
-        // Request root access on startup
-        lifecycleScope.launch(Dispatchers.IO) {
-            RootShell.ensureSession()
-        }
+        // Initialize file-based logging and secure credential storage
+        LogUtil.init(filesDir)
+        PasswordManager.init(this)
+        // 启动时初始化 SMB 加密库（MD4/AESCMAC），避免首次 SMB 操作时延迟失败
+        MissingAlgoProvider.register()
 
-        // Edge-to-edge: pad toolbar below status bar
-        ViewCompat.setOnApplyWindowInsetsListener(binding.topAppBar) { view, insets ->
-            val statusBars = insets.getInsets(WindowInsetsCompat.Type.statusBars())
-            view.setPadding(view.paddingLeft, statusBars.top, view.paddingRight, view.paddingBottom)
-            insets
-        }
-
-        val fragments = listOf(
-            BackupFragment(),
-            RestoreFragment(),
-            ConfigFragment()
-        )
-
-        binding.viewPager.adapter = TabAdapter(this, fragments)
-        binding.viewPager.isUserInputEnabled = true
-
-        binding.bottomNav.setOnItemSelectedListener { item ->
-            when (item.itemId) {
-                R.id.nav_backup -> binding.viewPager.currentItem = 0
-                R.id.nav_restore -> binding.viewPager.currentItem = 1
-                R.id.nav_config -> binding.viewPager.currentItem = 2
+        setContent {
+            AppTheme {
+                Surface(
+                    modifier = Modifier.fillMaxSize(),
+                    color = MaterialTheme.colorScheme.background,
+                ) {
+                    AppScaffold()
+                }
             }
-            true
         }
-
-        // Sync ViewPager -> BottomNav + Toolbar title
-        binding.viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
-            override fun onPageSelected(position: Int) {
-                binding.bottomNav.menu.getItem(position).isChecked = true
-                binding.topAppBar.title = pageTitles[position]
-            }
-        })
-    }
-
-    private class TabAdapter(
-        activity: FragmentActivity,
-        private val fragments: List<Fragment>
-    ) : FragmentStateAdapter(activity) {
-        override fun getItemCount(): Int = fragments.size
-        override fun createFragment(position: Int): Fragment = fragments[position]
     }
 }

app/src/main/java/com/example/androidbackupgui/backup/AppError.kt

@@ -0,0 +1,188 @@
+package com.example.androidbackupgui.backup
+
+/**
+ * 类型化应用错误层次。所有业务层错误统一为此 sealed interface。
+ *
+ * 使用方式：
+ * ```
+ * // 失败返回
+ * return err(AppError.Remote("连接超时", "download", cause = e, retryable = true))
+ *
+ * // 模式匹配
+ * when (error) {
+ *     is AppError.Network -> showRetry()
+ *     is AppError.Remote -> handleRemote(error)
+ *     is AppError.Cancelled -> ignore()
+ *     else -> showError(error.message)
+ * }
+ * ```
+ */
+sealed interface AppError {
+
+    /** 人类可读的错误描述 */
+    val message: String
+
+    /**
+     * 网络/IO 类错误。
+     * 用于 HTTP 请求超时、DNS 解析失败、连接被拒绝等可重试的网络异常。
+     *
+     * @property retryable 默认为 true，表示此错误可安全重试
+     */
+    data class Network(
+        override val message: String,
+        val cause: Throwable? = null,
+        val retryable: Boolean = true
+    ) : AppError
+
+    /**
+     * Root shell 命令执行错误。
+     * 用于 cp、tar、pm path、dumpsys 等 root 命令的非零退出。
+     */
+    data class Shell(
+        override val message: String,
+        val command: String,
+        val exitCode: Int,
+        val stderr: String
+    ) : AppError
+
+    /**
+     * 远端文件操作错误（WebDAV/SMB）。
+     * 用于上传、下载、列出、删除远端文件时的协议层错误。
+     *
+     * @property phase 错误发生时所在的阶段，可取 "connecting"、"transferring"、"list"、"delete" 等
+     * @property isNotFound 远端路径是否存在（区分 404 和其他错误）
+     * @property retryable 默认为 false，明确标记为可重试需业务层判断
+     */
+    data class Remote(
+        override val message: String,
+        val phase: String,
+        val cause: Throwable? = null,
+        val isNotFound: Boolean = false,
+        val retryable: Boolean = false
+    ) : AppError
+
+    /**
+     * 本地文件/IO 错误。
+     * 用于文件读写失败、磁盘空间不足、文件不存在等本地文件系统错误。
+     */
+    data class LocalIO(
+        override val message: String,
+        val path: String,
+        val cause: Throwable? = null
+    ) : AppError
+
+    /**
+     * restic 命令执行错误。
+     * 用于 restic backup / restore / snapshots / forget 等子命令返回非零退出码。
+     */
+    data class Restic(
+        override val message: String,
+        val exitCode: Int,
+        val stderr: String
+    ) : AppError
+
+    /**
+     * 解析/配置错误。
+     * 用于 JSON 解析失败、配置文件格式错误、参数校验失败等场景。
+     */
+    data class Parse(
+        override val message: String,
+        val detail: String = ""
+    ) : AppError
+
+    /** 操作被取消（用户中止或协程取消）。不应重试。 */
+    data object Cancelled : AppError {
+        override val message: String = "操作被取消"
+    }
+}
+
+/**
+ * 与 [AppError] 配套的类型化返回类型。
+ *
+ * 使用方式：
+ * ```
+ * fun load(): AppResult<List<Item>> {
+ *     return AppResult.Success(items)
+ *     // 或
+ *     return err(AppError.Network("连接失败"))
+ * }
+ *
+ * // 消费
+ * when (val result = load()) {
+ *     is AppResult.Success -> showItems(result.data)
+ *     is AppResult.Failure -> showError(result.error.message)
+ * }
+ *
+ * // 或使用 fold / map
+ * result.fold(
+ *     onSuccess = { items -> showItems(items) },
+ *     onFailure = { error -> showError(error.message) }
+ * )
+ * ```
+ */
+sealed class AppResult<out T> {
+    data class Success<T>(val data: T) : AppResult<T>()
+    data class Failure(val error: AppError) : AppResult<Nothing>()
+
+    /** Returns `true` if this is a [Success]. */
+    val isSuccess: Boolean get() = this is Success
+
+    /** Returns `true` if this is a [Failure]. */
+    val isFailure: Boolean get() = this is Failure
+
+    /** Returns the success value, or `null` if this is a [Failure]. */
+    fun getOrNull(): T? = (this as? Success)?.data
+
+    /** Returns the success value, or [default] if this is a [Failure]. */
+    fun getOrDefault(default: @UnsafeVariance T): T =
+        (this as? Success)?.data ?: default
+
+    /**
+     * Returns the success value, or throws a [RuntimeException]
+     * wrapping the error message if this is a [Failure].
+     */
+    fun getOrThrow(): T =
+        (this as? Success)?.data
+            ?: throw RuntimeException((this as Failure).error.message)
+
+    /**
+     * Returns a [RuntimeException] representing the error, or `null` if this is a [Success].
+     * Callers can access `.message` on the result.
+     */
+    fun exceptionOrNull(): Throwable? =
+        (this as? Failure)?.let { RuntimeException(it.error.message) }
+
+    /** Returns the [AppError], or `null` if this is a [Success]. */
+    fun errorOrNull(): AppError? = (this as? Failure)?.error
+
+    /**
+     * Fold: convert either branch into a single value [R].
+     * [onSuccess] receives the success value; [onFailure] receives the typed [AppError].
+     */
+    inline fun <R> fold(
+        crossinline onSuccess: (T) -> R,
+        crossinline onFailure: (AppError) -> R,
+    ): R = when (this) {
+        is Success -> onSuccess(data)
+        is Failure -> onFailure(error)
+    }
+
+    inline fun <R> map(crossinline transform: (T) -> R): AppResult<R> = when (this) {
+        is Success -> Success(transform(data))
+        is Failure -> this
+    }
+
+
+    /**
+     * Transform the error using [transform], or pass through the success unchanged.
+     */
+    fun mapError(transform: (AppError) -> AppError): AppResult<T> = when (this) {
+        is Success -> this
+        is Failure -> Failure(transform(error))
+    }
+}
+
+/**
+ * Create a failed [AppResult] wrapping the given [AppError].
+ */
+internal fun <T> err(error: AppError): AppResult<T> = AppResult.Failure(error)

app/src/main/java/com/example/androidbackupgui/backup/AppScanner.kt

@@ -10,33 +10,36 @@ import kotlinx.serialization.Serializable
 
 @Serializable
 data class AppInfo(
-    val packageName: String,
-    var label: String = "",
+    val packageName: PackageName,
+    val label: String = "",
     val isSystem: Boolean = false,
     val apkPaths: List<String> = emptyList(),
     val hasObb: Boolean = false,
     val isRunning: Boolean = false,
-    val backupSize: Long = 0  // estimated from last backup
+    val backupSize: Long = 0,  // estimated from last backup
+    // Enhanced fields (multi-user, keystore, icon)
+    val userId: UserId = UserId(0),
+    val hasKeystore: Boolean = false,
+    val iconPath: String? = null,
 )
 
 object AppScanner {
 
     /** Scan all third-party installed packages. */
-    suspend fun scanThirdParty(context: Context): List<AppInfo> = withContext(Dispatchers.IO) {
-        val result = RootShell.exec("pm list packages -3")
+    suspend fun scanThirdParty(context: Context, userId: Int = 0): List<AppInfo> = withContext(Dispatchers.IO) {
+        val result = RootShell.exec("pm list packages -3 --user $userId")
         if (!result.isSuccess) return@withContext emptyList()
 
         val packages = result.output.lines()
             .filter { it.startsWith("package:") }
             .map { it.removePrefix("package:").trim() }
             .filter { it.isNotEmpty() }
-            .map { AppInfo(packageName = it) }
+            .map { AppInfo(packageName = PackageName(it), userId = UserId(userId)) }
         resolveLabels(context, packages)
     }
 
-    /** Scan all system packages. */
-    suspend fun scanSystem(context: Context, config: BackupConfig): List<AppInfo> = withContext(Dispatchers.IO) {
-        val result = RootShell.exec("pm list packages -s")
+    suspend fun scanSystem(context: Context, config: BackupConfig, userId: Int = 0): List<AppInfo> = withContext(Dispatchers.IO) {
+        val result = RootShell.exec("pm list packages -s --user $userId")
         if (!result.isSuccess) return@withContext emptyList()
 
         val systemWhitelist = config.system.toSet()
@@ -48,14 +51,12 @@ object AppScanner {
             .map { it.removePrefix("package:").trim() }
             .filter { it.isNotEmpty() }
             .filter { pkg ->
-                // Allow if in system whitelist or data whitelist
                 pkg in systemWhitelist || pkg in dataWhitelist
             }
             .filter { pkg ->
-                // Exclude if in blacklist (when blacklistMode=1, full ignore)
                 if (config.blacklistMode == 1) pkg !in blacklist else true
             }
-            .map { AppInfo(packageName = it, isSystem = true) }
+            .map { AppInfo(packageName = PackageName(it), isSystem = true, userId = UserId(userId)) }
         resolveLabels(context, packages)
     }
 
@@ -68,15 +69,15 @@ object AppScanner {
     fun resolveLabels(context: Context, packages: List<AppInfo>): List<AppInfo> {
         if (packages.isEmpty()) return packages
         val pm = context.packageManager
-        for (app in packages) {
-            app.label = try {
-                val ai = pm.getApplicationInfo(app.packageName, 0)
+        return packages.map { app ->
+            val resolvedLabel = try {
+                val ai = pm.getApplicationInfo(app.packageName.value, 0)
                 pm.getApplicationLabel(ai).toString()
             } catch (_: PackageManager.NameNotFoundException) {
-                app.packageName
+                app.packageName.value
             }
+            app.copy(label = resolvedLabel)
         }
-        return packages
     }
 
     /** Get APK paths for a package. */
@@ -90,16 +91,6 @@ object AppScanner {
             .filter { it.isNotEmpty() }
     }
 
-    /** Get the app label/name. */
-    suspend fun getAppLabel(packageName: String): String = withContext(Dispatchers.IO) {
-        val result = RootShell.exec("dumpsys package '${packageName.shellEscape()}' | grep -A1 'ApplicationInfo' | grep 'label=' | head -1")
-        val label = result.output
-            .substringAfter("label=", "")
-            .substringBefore(" ")
-            .removeSurrounding("\"")
-            .trim()
-        label.ifEmpty { packageName }
-    }
 
     /** Check if a package has OBB data. */
     suspend fun hasObbData(packageName: String): Boolean = withContext(Dispatchers.IO) {
@@ -112,7 +103,69 @@ object AppScanner {
         val result = RootShell.exec("pidof '${packageName.shellEscape()}'")
         result.output.isNotBlank()
     }
+    /** Check if an app has keystore entries (critical — keystore keys can be lost on backup). */
+    suspend fun hasKeystore(packageName: String): Boolean = withContext(Dispatchers.IO) {
+        // Resolve the app's UID first
+        val uidResult = RootShell.exec("dumpsys package '${packageName.shellEscape()}' | grep 'userId=' | head -1")
+        val uid = uidResult.output
+            .substringAfter("userId=", "")
+            .substringBefore(" ")
+            .substringBefore(",")
+            .trim()
+            .toIntOrNull() ?: return@withContext false
+        // keystore_cli_v2 list as app UID — more than 1 line means has keystore entries
+        val ksResult = RootShell.exec("su $uid -c 'keystore_cli_v2 list' 2>/dev/null")
+        ksResult.output.lines().count { it.isNotBlank() } > 1
+    }
+    /** Enumerate all user profiles on the device for multi-user support. */
+    suspend fun enumerateUsers(): List<Pair<Int, String>> = withContext(Dispatchers.IO) {
+        val result = RootShell.exec("pm list users")
+        if (!result.isSuccess) return@withContext listOf(0 to "Owner")
 
+        result.output.lines()
+            .filter { it.contains("UserInfo") }
+            .mapNotNull { line ->
+                val id = line.substringBefore(":").trim().toIntOrNull()
+                val name = line.substringAfter(":").substringBefore(":").trim()
+                if (id != null) id to name else null
+            }
+    }
+
+    /** Extract and save an app's icon to the given directory. */
+    suspend fun extractIcon(packageName: String, destDir: java.io.File, userId: Int = 0): String? = withContext(Dispatchers.IO) {
+        // Try snapshot cache first
+        val snapshotDir = "/data/system_ce/$userId/snapshots/$packageName"
+        val snapshotResult = RootShell.exec("ls '${snapshotDir.shellEscape()}/' 2>/dev/null | head -1")
+        if (snapshotResult.isSuccess && snapshotResult.output.isNotBlank()) {
+            val iconName = snapshotResult.output.trim()
+            val iconFile = java.io.File(destDir, "app_icon.png")
+            val copyResult = RootShell.exec("cp '${snapshotDir.shellEscape()}/${iconName.shellEscape()}' '${iconFile.absolutePath.shellEscape()}' 2>/dev/null")
+            if (copyResult.isSuccess && iconFile.exists()) {
+                return@withContext iconFile.absolutePath
+            }
+        }
+        // Fallback: extract from APK using aapt
+        val apkPaths = getApkPaths(packageName)
+        if (apkPaths.isNotEmpty()) {
+            val primaryApk = apkPaths.first()
+            val badgeResult = RootShell.exec("aapt d badging '$primaryApk' 2>/dev/null | grep '^application:.*icon=' | head -1")
+            if (badgeResult.isSuccess) {
+                val iconPath = badgeResult.output
+                    .substringAfter("icon='")
+                    .substringBefore("'")
+                    .takeIf { it.isNotBlank() }
+                if (iconPath != null) {
+                    // The icon path is relative inside the APK, extract using aapt
+                    val iconFile = java.io.File(destDir, "app_icon.png")
+                    RootShell.exec("aapt d raw '$primaryApk' '$iconPath' > '${iconFile.absolutePath.shellEscape()}' 2>/dev/null")
+                    if (iconFile.exists()) {
+                        return@withContext iconFile.absolutePath
+                    }
+                }
+            }
+        }
+        null
+    }
     /** Apply appList.txt-style filters. Lines starting with # are ignored, ! means apk-only. */
     fun parseAppList(content: String): List<Pair<String, Boolean>> {
         return content.lines()

app/src/main/java/com/example/androidbackupgui/backup/BackendExecutor.kt

@@ -0,0 +1,136 @@
+package com.example.androidbackupgui.backup
+
+import java.io.File
+
+/**
+ * 后端执行器——消除 [ResticBackup]、[ResticRestore]、[ResticSnapshotOps]、
+ * [ResticMaintenance] 和 [ResticRepoInit] 中重复的 local-vs-remote 分支。
+ *
+ * 使用方式（替换所有子模块中的 if backend == "local" 模式）：
+ *
+ * ```
+ * executor.withBackend(
+ *     repoPath = repoPath, password = password, cacheDir = cacheDir,
+ *     backend = backend, backendUrl = backendUrl,
+ *     backendUser = backendUser, backendPass = backendPass,
+ *     backendShare = backendShare, backendDomain = backendDomain,
+ *     runner = runner, envResolver = envResolver, bridgeRunner = bridgeRunner,
+ * ) { env ->
+ *     val result = runner.runRestic(env, args)
+ *     // parse result
+ * }
+ * ```
+ */
+class BackendExecutor {
+    /**
+     * 使用 [block] 执行 restic 操作。
+     *
+     * - "local" 后端：直接通过 [ResticEnvResolver.buildLocalEnv] 构建环境
+     * - 远程后端：通过 [RestBridgeRunner.withBridge] 启动 REST 桥后再构建环境
+     *
+     * @param T 返回值的类型（例如 [AppResult]）
+     * @param block 接收环境变量 Map，返回 [T]
+     */
+    suspend fun <T> withBackend(
+        repoPath: String,
+        password: String,
+        cacheDir: String,
+        backend: String,
+        backendUrl: String,
+        backendUser: String,
+        backendPass: String,
+        backendShare: String,
+        backendDomain: String,
+        runner: ResticCommandRunner,
+        envResolver: ResticEnvResolver,
+        bridgeRunner: RestBridgeRunner,
+        block: suspend (Map<String, String>) -> T,
+    ): T {
+        if (backend == "local") {
+            val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
+            return block(env)
+        }
+        return bridgeRunner.withBridge(
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+            backendDomain,
+            repoPath,
+            File(cacheDir),
+        ) { bridgeUrl, authToken ->
+            val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+            block(env)
+        }
+    }
+
+    /**
+     * 与 [withBackend] 相同，但自动将 [args] 传给 [runner.runRestic]。
+     *
+     * 适用于 "run-and-parse-exit-code" 模式的简化调用。
+     */
+    suspend fun runResticWithBackend(
+        args: List<String>,
+        repoPath: String,
+        password: String,
+        cacheDir: String,
+        backend: String,
+        backendUrl: String,
+        backendUser: String,
+        backendPass: String,
+        backendShare: String,
+        backendDomain: String,
+        runner: ResticCommandRunner,
+        envResolver: ResticEnvResolver,
+        bridgeRunner: RestBridgeRunner,
+    ): ResticCommandRunner.CommandResult =
+        withBackend(
+            repoPath = repoPath,
+            password = password,
+            cacheDir = cacheDir,
+            backend = backend,
+            backendUrl = backendUrl,
+            backendUser = backendUser,
+            backendPass = backendPass,
+            backendShare = backendShare,
+            backendDomain = backendDomain,
+            runner = runner,
+            envResolver = envResolver,
+            bridgeRunner = bridgeRunner,
+        ) { env -> runner.runRestic(env, args) }
+
+    /**
+     * 与 [runResticWithBackend] 相同，但使用流式模式。
+     */
+    suspend fun runResticStreamingWithBackend(
+        args: List<String>,
+        repoPath: String,
+        password: String,
+        cacheDir: String,
+        backend: String,
+        backendUrl: String,
+        backendUser: String,
+        backendPass: String,
+        backendShare: String,
+        backendDomain: String,
+        runner: ResticCommandRunner,
+        envResolver: ResticEnvResolver,
+        bridgeRunner: RestBridgeRunner,
+        onLine: suspend (String) -> Unit = {},
+    ): ResticCommandRunner.CommandResult =
+        withBackend(
+            repoPath = repoPath,
+            password = password,
+            cacheDir = cacheDir,
+            backend = backend,
+            backendUrl = backendUrl,
+            backendUser = backendUser,
+            backendPass = backendPass,
+            backendShare = backendShare,
+            backendDomain = backendDomain,
+            runner = runner,
+            envResolver = envResolver,
+            bridgeRunner = bridgeRunner,
+        ) { env -> runner.runResticStreaming(env, args, onLine) }
+}

app/src/main/java/com/example/androidbackupgui/backup/BackupConfig.kt

@@ -1,81 +1,123 @@
 package com.example.androidbackupgui.backup
 
-import java.io.File
 import kotlinx.serialization.Serializable
+import java.io.File
 
 /**
  * Mirrors backup_settings.conf from backup_script.
  * All keys correspond 1:1 with the original shell config.
+ *
+ * This is an immutable data class. Use [copy] to create modified instances.
  */
 @Serializable
 data class BackupConfig(
     // Operation mode
-    var lo: Int = 0,                        // 0=volume key, 1=volume force, 2=keyboard
-    var backgroundExecution: Int = 0,       // 0=foreground, 1=background
-    var setDisplayPowerMode: Int = 0,       // 1=keep screen on during backup
-    var shellLang: String = "",             // ""=auto, "1"=zh-CN, "0"=zh-TW
-
+    val lo: Int = 0, // 0=volume key, 1=volume force, 2=keyboard
+    val backgroundExecution: Int = 0, // 0=foreground, 1=background
+    val setDisplayPowerMode: Int = 0, // 1=keep screen on during backup
+    val shellLang: String = "", // ""=auto, "1"=zh-CN, "0"=zh-TW
     // Paths
-    var outputPath: String = "",            // Custom output dir
-    var listLocation: String = "",          // Custom appList.txt location
-
+    val outputPath: String = "", // Custom output dir
+    val listLocation: String = "", // Custom appList.txt location
     // Update
-    var update: Int = 1,                    // 1=auto update
-    var cdn: Int = 1,                       // CDN node
-
+    val update: Int = 1, // 1=auto update
+    val cdn: Int = 1, // CDN node
     // Filters
-    var mountPoint: String = "rannki|0000-1",
-    var user: String = "",
-
+    val mountPoint: String = "rannki|0000-1",
+    val user: String = "",
     // Backup mode
-    var backupMode: Int = 1,                // 1=data+apk, 0=apk only
-    var backupUserData: Int = 1,
-    var backupObbData: Int = 1,
-    var backupMedia: Int = 0,
-    var backgroundAppsIgnore: Int = 0,
-
+    val backupMode: Int = 1, // 1=data+apk, 0=apk only
+    val backupUserData: Int = 1,
+    val backupObbData: Int = 1,
+    val backupMedia: Int = 0,
+    val backgroundAppsIgnore: Int = 0,
+    val backupUserId: Int = 0, // Android user ID (0=Owner)
     // Custom paths
-    var customPath: List<String> = listOf(
-        "/storage/emulated/0/Pictures/",
-        "/storage/emulated/0/Download/",
-        "/storage/emulated/0/Music",
-        "/storage/emulated/0/DCIM/",
-        "/data/adb"
-    ),
-
+    val customPath: List<String> =
+        listOf(
+            "/storage/emulated/0/Pictures/",
+            "/storage/emulated/0/Download/",
+            "/storage/emulated/0/Music",
+            "/storage/emulated/0/DCIM/",
+            "/data/adb",
+        ),
     // Blacklist
-    var blacklistMode: Int = 0,             // 1=full ignore, 0=apk only
-    var blacklist: List<String> = emptyList(),
-
+    val blacklistMode: Int = 0, // 1=full ignore, 0=apk only
+    val blacklist: List<String> = emptyList(),
     // Whitelists
-    var whitelist: List<String> = emptyList(),
-    var system: List<String> = emptyList(),
-
+    val whitelist: List<String> = emptyList(),
+    val system: List<String> = emptyList(),
     // Compression
-    var compressionMethod: String = "zstd", // zstd or tar
-
+    val compressionMethod: String = "zstd", // zstd or tar
     // Terminal colors
-    var rgbA: Int = 226,
-    var rgbB: Int = 123,
-    var rgbC: Int = 177,
-
-    var backupWifi: Int = 1,
-
+    val rgbA: Int = 226,
+    val rgbB: Int = 123,
+    val rgbC: Int = 177,
+    val backupWifi: Int = 1,
     // Restic deduplicated backup with rclone backend
-    var resticEnabled: Int = 0,
-    var resticRepo: String = "",
-    var resticPassword: String = "",
-    var resticBackend: String = "local",    // local / webdav / smb
-    var resticBackendUrl: String = "",
-    var resticBackendUser: String = "",
-    var resticBackendPass: String = "",
-    var resticBackendShare: String = "",      // SMB share name
-    var resticBackendDomain: String = ""      // SMB domain (optional, for NTLM)
+    val resticEnabled: Int = 0,
+    val resticRepo: String = "",
+    /**
+     * restic 密码不在配置文件中明文存储。始终通过 PasswordManager 存取。
+     * 此字段仅保留默认值，用于反序列化兼容旧版配置文件。
+     */
+    @Deprecated("Use PasswordManager.getResticPassword() instead; kept only for config file backward compat")
+    val resticPassword: String = "",
+    val resticBackend: String = "local", // local / webdav / smb
+    val resticBackendUrl: String = "",
+    val resticBackendUser: String = "",
+    /** @deprecated Use PasswordManager instead */
+    @Deprecated("Use PasswordManager instead")
+    val resticBackendPass: String = "",
+    val resticBackendShare: String = "", // SMB share name
+    val resticBackendDomain: String = "", // SMB domain (optional, for NTLM)
+    // Streaming backup: pipe tar data through FIFO directly into restic --stdin
+    // 0=disabled (default, stable), 1=enabled (experimental, avoids temp files)
+    val useStreaming: Int = 0,
 ) {
     companion object {
+        /**
+         * Unescape a quoted config value. Reverses [escapeValue]: turns \\ and \"
+         * back into \ and ". Applied only to values that were stored inside quotes.
+         */
+        private fun unescapeValue(s: String): String {
+            if (s.indexOf('\\') < 0) return s
+            val sb = StringBuilder(s.length)
+            var i = 0
+            while (i < s.length) {
+                val c = s[i]
+                if (c == '\\' && i + 1 < s.length) {
+                    sb.append(s[i + 1])
+                    i += 2
+                } else {
+                    sb.append(c)
+                    i++
+                }
+            }
+            return sb.toString()
+        }
+
+        /** Escape a value for safe storage inside double quotes. */
+        private fun escapeValue(s: String): String = s.replace("\\", "\\\\").replace("\"", "\\\"")
+
         fun fromFile(file: File): BackupConfig {
-            val config = BackupConfig()
-            if (!file.exists()) return config
+            if (!file.exists()) return BackupConfig()
+
+            // Quoted-string fields preserve their inner whitespace and may contain
+            // escaped characters; bare fields are trimmed as before.
+            val quotedKeys =
+                setOf(
+                    "Output_path",
+                    "list_location",
+                    "mount_point",
+                    "restic_repo",
+                    "restic_password",
+                    "restic_backend_url",
+                    "restic_backend_user",
+                    "restic_backend_pass",
+                    "restic_backend_share",
+                    "restic_backend_domain",
+                )
 
             val props = mutableMapOf<String, String>()
             file.forEachLine { line ->
@@ -84,103 +126,137 @@ data class BackupConfig(
                 val eq = trimmed.indexOf('=')
                 if (eq < 0) return@forEachLine
                 val key = trimmed.substring(0, eq).trim()
-                val value = trimmed.substring(eq + 1).trim().removeSurrounding("\"")
-                props[key] = value
+                val rawValue = trimmed.substring(eq + 1)
+                props[key] =
+                    if (key in quotedKeys) {
+                        // Strip the surrounding quotes (if present) WITHOUT trimming the
+                        // inner content, so leading/trailing spaces in e.g. a password
+                        // survive a save/load round trip. Then unescape.
+                        val v = rawValue
+                        if (v.length >= 2 && v.startsWith("\"") && v.endsWith("\"")) {
+                            unescapeValue(v.substring(1, v.length - 1))
+                        } else {
+                            // Legacy/unquoted value — fall back to trimmed form.
+                            unescapeValue(v.trim().removeSurrounding("\""))
+                        }
+                    } else {
+                        rawValue.trim().removeSurrounding("\"")
+                    }
             }
 
-            fun int(key: String, default: Int = 0) = props[key]?.toIntOrNull() ?: default
+            fun int(
+                key: String,
+                default: Int = 0,
+            ) = props[key]?.toIntOrNull() ?: default
+
             fun str(key: String) = props[key] ?: ""
+
             fun lines(key: String): List<String> {
                 val raw = props[key] ?: return emptyList()
-                return raw.split("\\s+".toRegex())
+                return raw
+                    .split("\\s+".toRegex())
                     .filter { it.isNotBlank() && it != "\"\"" }
                     .map { it.replace("%20", " ") }
             }
 
-            config.lo = int("Lo")
-            config.backgroundExecution = int("background_execution")
-            config.setDisplayPowerMode = int("setDisplayPowerMode")
-            config.shellLang = str("Shell_LANG")
-            config.outputPath = str("Output_path")
-            config.listLocation = str("list_location")
-            config.update = int("update", default = 1)
-            config.cdn = int("cdn", default = 1)
-            config.mountPoint = str("mount_point")
-            config.user = str("user")
-            config.backupMode = int("Backup_Mode", default = 1)
-            config.backupUserData = int("Backup_user_data", default = 1)
-            config.backupObbData = int("Backup_obb_data", default = 1)
-            config.backupMedia = int("backup_media")
-            config.backgroundAppsIgnore = int("Background_apps_ignore")
-            config.customPath = lines("Custom_path")
-            config.blacklistMode = int("blacklist_mode")
-            config.blacklist = lines("blacklist")
-            config.whitelist = lines("whitelist")
-            config.system = lines("system")
-            config.compressionMethod = str("Compression_method").ifEmpty { "zstd" }
-            config.rgbA = int("rgb_a").let { if (it == 0) 226 else it }
-            config.rgbB = int("rgb_b").let { if (it == 0) 123 else it }
-            config.rgbC = int("rgb_c").let { if (it == 0) 177 else it }
-            config.backupWifi = int("backup_wifi", default = 1)
-            config.resticEnabled = int("restic_enabled")
-            config.resticRepo = str("restic_repo")
-            config.resticPassword = str("restic_password")
-            config.resticBackend = str("restic_backend").ifEmpty { "local" }
-            config.resticBackendUrl = str("restic_backend_url")
-            config.resticBackendUser = str("restic_backend_user")
-            config.resticBackendPass = str("restic_backend_pass")
-            config.resticBackendShare = str("restic_backend_share")
-            config.resticBackendDomain = str("restic_backend_domain")
-            return config
+            return BackupConfig(
+                lo = int("Lo"),
+                backgroundExecution = int("background_execution"),
+                setDisplayPowerMode = int("setDisplayPowerMode"),
+                shellLang = str("Shell_LANG"),
+                outputPath = str("Output_path"),
+                listLocation = str("list_location"),
+                update = int("update", default = 1),
+                cdn = int("cdn", default = 1),
+                mountPoint = str("mount_point"),
+                user = str("user"),
+                backupMode = int("Backup_Mode", default = 1),
+                backupUserData = int("Backup_user_data", default = 1),
+                backupObbData = int("Backup_obb_data", default = 1),
+                backupMedia = int("backup_media"),
+                backgroundAppsIgnore = int("Background_apps_ignore"),
+                backupUserId = int("backup_user_id"),
+                customPath = lines("Custom_path"),
+                blacklistMode = int("blacklist_mode"),
+                blacklist = lines("blacklist"),
+                whitelist = lines("whitelist"),
+                system = lines("system"),
+                compressionMethod = str("Compression_method").ifEmpty { "zstd" },
+                rgbA = int("rgb_a").let { if (it == 0) 226 else it },
+                rgbB = int("rgb_b").let { if (it == 0) 123 else it },
+                rgbC = int("rgb_c").let { if (it == 0) 177 else it },
+                backupWifi = int("backup_wifi", default = 1),
+                resticEnabled = int("restic_enabled"),
+                resticRepo = str("restic_repo"),
+                resticPassword = "", // 不用配置文件中的值，见下方迁移逻辑
+                resticBackend = str("restic_backend").ifEmpty { "local" },
+                resticBackendUrl = str("restic_backend_url"),
+                resticBackendUser = str("restic_backend_user"),
+                resticBackendPass = "", // 不用配置文件中的值
+                resticBackendShare = str("restic_backend_share"),
+                resticBackendDomain = str("restic_backend_domain"),
+                useStreaming = int("streaming_backup"),
+            )
         }
 
-        fun toFile(config: BackupConfig, file: File) {
+        fun toFile(
+            config: BackupConfig,
+            file: File,
+        ) {
             file.parentFile?.mkdirs()
-            file.writeText(buildString {
-                appendLine("# SpeedBackup Configuration")
-                appendLine("Lo=${config.lo}")
-                appendLine("background_execution=${config.backgroundExecution}")
-                appendLine("setDisplayPowerMode=${config.setDisplayPowerMode}")
-                appendLine("Shell_LANG=${config.shellLang}")
-                appendLine("Output_path=\"${config.outputPath}\"")
-                appendLine("list_location=\"${config.listLocation}\"")
-                appendLine("update=${config.update}")
-                appendLine("cdn=${config.cdn}")
-                appendLine("mount_point=\"${config.mountPoint}\"")
-                appendLine("user=${config.user}")
-                appendLine("Backup_Mode=${config.backupMode}")
-                appendLine("Backup_user_data=${config.backupUserData}")
-                appendLine("Backup_obb_data=${config.backupObbData}")
-                appendLine("backup_media=${config.backupMedia}")
-                appendLine("Background_apps_ignore=${config.backgroundAppsIgnore}")
-                append("Custom_path=\"")
-                config.customPath.forEach { append(" ${it.replace(" ", "%20")}") }
-                appendLine(" \"")
-                appendLine("blacklist_mode=${config.blacklistMode}")
-                append("blacklist=\"")
-                config.blacklist.forEach { append(" ${it.replace(" ", "%20")}") }
-                appendLine(" \"")
-                append("whitelist=\"")
-                config.whitelist.forEach { append(" ${it.replace(" ", "%20")}") }
-                appendLine(" \"")
-                append("system=\"")
-                config.system.forEach { append(" ${it.replace(" ", "%20")}") }
-                appendLine(" \"")
-                appendLine("Compression_method=${config.compressionMethod}")
-                appendLine("rgb_a=${config.rgbA}")
-                appendLine("rgb_b=${config.rgbB}")
-                appendLine("rgb_c=${config.rgbC}")
-                appendLine("backup_wifi=${config.backupWifi}")
-                appendLine("restic_enabled=${config.resticEnabled}")
-                appendLine("restic_repo=\"${config.resticRepo}\"")
-                appendLine("restic_password=\"${config.resticPassword}\"")
-                appendLine("restic_backend=${config.resticBackend}")
-                appendLine("restic_backend_url=\"${config.resticBackendUrl}\"")
-                appendLine("restic_backend_user=\"${config.resticBackendUser}\"")
-                appendLine("restic_backend_pass=\"${config.resticBackendPass}\"")
-                appendLine("restic_backend_share=\"${config.resticBackendShare}\"")
-                appendLine("restic_backend_domain=\"${config.resticBackendDomain}\"")
-            })
+            file.writeText(
+                buildString {
+                    appendLine("# SpeedBackup Configuration")
+                    appendLine("Lo=${config.lo}")
+                    appendLine("background_execution=${config.backgroundExecution}")
+                    appendLine("setDisplayPowerMode=${config.setDisplayPowerMode}")
+                    appendLine("Shell_LANG=${config.shellLang}")
+                    appendLine("Output_path=\"${escapeValue(config.outputPath)}\"")
+                    appendLine("list_location=\"${escapeValue(config.listLocation)}\"")
+                    appendLine("update=${config.update}")
+                    appendLine("cdn=${config.cdn}")
+                    appendLine("mount_point=\"${escapeValue(config.mountPoint)}\"")
+                    appendLine("user=${config.user}")
+                    appendLine("Backup_Mode=${config.backupMode}")
+                    appendLine("Backup_user_data=${config.backupUserData}")
+                    appendLine("Backup_obb_data=${config.backupObbData}")
+                    appendLine("backup_media=${config.backupMedia}")
+                    appendLine("backup_user_id=${config.backupUserId}")
+                    appendLine("Background_apps_ignore=${config.backgroundAppsIgnore}")
+                    append("Custom_path=\"")
+                    config.customPath.forEach { append(" ${it.replace(" ", "%20")}") }
+                    appendLine(" \"")
+                    appendLine("blacklist_mode=${config.blacklistMode}")
+                    append("blacklist=\"")
+                    config.blacklist.forEach { append(" ${it.replace(" ", "%20")}") }
+                    appendLine(" \"")
+                    append("whitelist=\"")
+                    config.whitelist.forEach { append(" ${it.replace(" ", "%20")}") }
+                    appendLine(" \"")
+                    append("system=\"")
+                    config.system.forEach { append(" ${it.replace(" ", "%20")}") }
+                    appendLine(" \"")
+                    appendLine("Compression_method=${config.compressionMethod}")
+                    appendLine("rgb_a=${config.rgbA}")
+                    appendLine("rgb_b=${config.rgbB}")
+                    appendLine("rgb_c=${config.rgbC}")
+                    appendLine("backup_wifi=${config.backupWifi}")
+                    appendLine("restic_enabled=${config.resticEnabled}")
+                    appendLine("restic_repo=\"${escapeValue(config.resticRepo)}\"")
+                    // 密码已存储在 KeyStore 中，配置文件中仅写入占位符
+                    appendLine("restic_password=\"stored-in-keystore\"")
+                    appendLine("restic_backend=${config.resticBackend}")
+                    appendLine("restic_backend_url=\"${escapeValue(config.resticBackendUrl)}\"")
+                    appendLine("restic_backend_user=\"${escapeValue(config.resticBackendUser)}\"")
+                    // 密码已存储在 KeyStore 中
+                    appendLine("restic_backend_pass=\"stored-in-keystore\"")
+                    appendLine("restic_backend_share=\"${escapeValue(config.resticBackendShare)}\"")
+                    appendLine("restic_backend_domain=\"${escapeValue(config.resticBackendDomain)}\"")
+                    appendLine("streaming_backup=${config.useStreaming}")
+                },
+            )
+            file.setReadable(true, true) // owner only
+            file.setWritable(true, true) // owner only
         }
     }
 }

app/src/main/java/com/example/androidbackupgui/backup/BackupOperation.kt

@@ -1,19 +1,22 @@
 package com.example.androidbackupgui.backup
 
-import com.example.androidbackupgui.root.RootShell
 import android.util.Log
+import com.example.androidbackupgui.backup.ResticWrapper.SnapshotAppInfo
+import com.example.androidbackupgui.root.RootShell
 import com.example.androidbackupgui.root.shellEscape
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.isActive
-import kotlinx.coroutines.withContext
-import java.io.File
-import org.json.JSONObject
-import kotlin.coroutines.coroutineContext
-import kotlinx.serialization.Serializable
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.coroutineScope
-import kotlinx.coroutines.launch
+import kotlinx.coroutines.ensureActive
 import kotlinx.coroutines.sync.Semaphore
 import kotlinx.coroutines.sync.withPermit
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.Serializable
+import org.json.JSONArray
+import org.json.JSONObject
+import java.io.File
+import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.atomic.AtomicInteger
 
 /**
@@ -21,7 +24,6 @@ import java.util.concurrent.atomic.AtomicInteger
  * Mirrors the logic from backup_script's modules/backup.sh.
  */
 object BackupOperation {
-
     private const val TAG = "BackupOperation"
 
     @Serializable
@@ -29,8 +31,8 @@ object BackupOperation {
         val current: Int,
         val total: Int,
         val packageName: String,
-        val stage: String,        // "apk", "data", "obb", "ssaid", "done"
-        val message: String
+        val stage: String, // "apk", "data", "obb", "ssaid", "done"
+        val message: String,
     )
 
     @Serializable
@@ -39,7 +41,7 @@ object BackupOperation {
         val failCount: Int,
         val skippedCount: Int,
         val outputDir: String,
-        val elapsedMs: Long
+        val elapsedMs: Long,
     )
 
     /**
@@ -48,250 +50,766 @@ object BackupOperation {
      * @param config backup configuration
      * @param outputDir root output directory
      * @param userId Android user ID (0, 999, etc.)
-     * @param onProgress callback for UI updates
+     * @param includePkgs if non-empty, only backup apps whose package name is in this set;
+     *                    metadata (app_details.json, appList.txt) is still generated for all [apps].
+     * @param legacyApps metadata from a previous snapshot used to populate app_details.json
+     *                   for apps not in [apps] (keeps them in the cumulative snapshot record
+     *                   without requiring re-scans of possibly-uninstalled apps).
      */
     suspend fun backupApps(
+        context: android.content.Context,
         apps: List<AppInfo>,
         config: BackupConfig,
         outputDir: File,
         userId: String = "0",
-        onProgress: suspend (BackupProgress) -> Unit = {}
-    ): BackupResult = withContext(Dispatchers.IO) {
-        val emit: suspend (BackupProgress) -> Unit = { p -> withContext(Dispatchers.Main) { onProgress(p) } }
-        val startTime = System.currentTimeMillis()
+        noDataBackup: Set<String> = emptySet(),
+        includePkgs: Set<String> = emptySet(),
+        legacyApps: Map<String, SnapshotAppInfo>? = null,
+        onProgress: suspend (BackupProgress) -> Unit = {},
+    ): BackupResult =
+        withContext(Dispatchers.IO) {
+            val emit: suspend (BackupProgress) -> Unit = { p -> withContext(Dispatchers.Main) { onProgress(p) } }
+            val startTime = System.currentTimeMillis()
 
-        // Create backup structure
-        val backupRoot = File(outputDir, "Backup_${config.compressionMethod}_$userId")
-        backupRoot.mkdirs()
-
-        // Write app list
-        val appListFile = File(backupRoot, "appList.txt")
-        appListFile.writeText(apps.joinToString("\n") { it.packageName })
-
-        // Write metadata JSON
-        val metaFile = File(backupRoot, "app_details.json")
-        metaFile.writeText(buildAppDetailsJson(apps))
-
-        val semaphore = Semaphore(3)
-        val successAtomic = AtomicInteger(0)
-        val failAtomic = AtomicInteger(0)
-        val skippedAtomic = AtomicInteger(0)
-
-        coroutineScope {
-            apps.forEachIndexed { index, app ->
-                launch {
-                    if (!coroutineContext.isActive) return@launch
-                    semaphore.withPermit {
-                        val appDir = File(backupRoot, app.packageName)
-                        appDir.mkdirs()
-
-                        emit(BackupProgress(index + 1, apps.size, app.packageName, "apk", "正在备份 APK…"))
-
-                        // 1. Backup APK
-                        val paths = AppScanner.getApkPaths(app.packageName)
-                        val apkOk = if (paths.isNotEmpty()) {
-                            paths.withIndex().all { (i, apkPath) ->
-                                val destName = if (paths.size > 1) "${app.packageName}_split_$i.apk" else "${app.packageName}.apk"
-                                RootShell.exec("cp '${apkPath.shellEscape()}' '${appDir.absolutePath.shellEscape()}/${destName.shellEscape()}'").isSuccess
-                            }
-                        } else false
-
-                        if (!apkOk) {
-                            failAtomic.incrementAndGet()
-                            emit(BackupProgress(index + 1, apps.size, app.packageName, "done", "APK 备份失败"))
-                            return@withPermit
-                        }
-
-                        // 2. Backup user data (if configured)
-                        if (config.backupMode == 1 && config.backupUserData == 1) {
-                            emit(BackupProgress(index + 1, apps.size, app.packageName, "data", "正在备份数据…"))
-                            if (!backupUserData(app.packageName, appDir, userId, config.compressionMethod)) {
-                                failAtomic.incrementAndGet()
-                                emit(BackupProgress(index + 1, apps.size, app.packageName, "done", "数据备份失败"))
-                                return@withPermit
-                            }
-                        }
-
-                        // 3. Backup OBB (if configured and exists)
-                        if (config.backupMode == 1 && config.backupObbData == 1) {
-                            val hasObb = AppScanner.hasObbData(app.packageName)
-                            if (hasObb) {
-                                emit(BackupProgress(index + 1, apps.size, app.packageName, "obb", "正在备份 OBB…"))
-                                if (!backupObb(app.packageName, appDir, config.compressionMethod)) {
-                                    failAtomic.incrementAndGet()
-                                    emit(BackupProgress(index + 1, apps.size, app.packageName, "done", "OBB 备份失败"))
-                                    return@withPermit
-                                }
-                            }
-                        }
-
-                        // 4. Backup SSAID
-                        emit(BackupProgress(index + 1, apps.size, app.packageName, "ssaid", "正在备份 SSAID…"))
-                        backupSsaid(app.packageName, appDir, userId)
-
-                        // 5. Backup runtime permissions
-                        backupPermissions(app.packageName, appDir)
-
-                        successAtomic.incrementAndGet()
-                        emit(BackupProgress(index + 1, apps.size, app.packageName, "done", "完成"))
-                    }
-                }
+            // Safety check: refuse to backup inside Android/data directories
+            val absOut = outputDir.absolutePath
+            if (absOut.contains("/Android/")) {
+                LogUtil.e(TAG, "backupApps: refusing to backup inside Android/ directory: $absOut")
+                return@withContext BackupResult(0, 0, 0, absOut, 0)
             }
+
+            // Create backup structure
+            val backupRoot = File(outputDir, "Backup_${config.compressionMethod}_$userId")
+            if (!mkdirsForBackup(backupRoot)) {
+                LogUtil.e(TAG, "backupApps: cannot create output dir ${backupRoot.absolutePath}")
+                return@withContext BackupResult(0, 0, 0, outputDir.absolutePath, 0)
+            }
+            LogUtil.i(TAG, "backupApps: starting backup of ${apps.size} apps to ${backupRoot.absolutePath}")
+
+            // Read previous metadata for incremental backup comparison
+            val oldMetaFile = File(backupRoot, "app_details.json")
+            val oldMetaJson =
+                if (oldMetaFile.exists()) {
+                    try {
+                        JSONObject(readTextFile(oldMetaFile) ?: "{}")
+                    } catch (_: Exception) {
+                        JSONObject()
+                    }
+                } else {
+                    JSONObject()
+                }
+
+            // Write app list — includes ALL packages in [apps] (selected + legacy from snapshot)
+            val appListFile = File(backupRoot, "appList.txt")
+            if (!writeFileForBackup(appListFile, apps.joinToString("\n") { it.packageName.value })) {
+                LogUtil.e(TAG, "backupApps: failed to write appList.txt")
+                return@withContext BackupResult(0, 0, 0, outputDir.absolutePath, 0)
+            }
+
+            // Write metadata JSON — fresh metadata for selected apps, legacy for historical apps
+            val metaFile = File(backupRoot, "app_details.json")
+            if (!writeFileForBackup(metaFile, buildAppDetailsJson(apps, legacyApps))) {
+                LogUtil.e(TAG, "backupApps: failed to write app_details.json")
+                return@withContext BackupResult(0, 0, 0, outputDir.absolutePath, 0)
+            }
+
+            val backupTargets = if (includePkgs.isEmpty()) apps else apps.filter { it.packageName.value in includePkgs }
+            val totalCount = backupTargets.size
+            LogUtil.i(TAG, "backupApps: includePkgs=${includePkgs.size} targets=$totalCount")
+            val semaphore = Semaphore(3)
+            val successAtomic = AtomicInteger(0)
+            val failAtomic = AtomicInteger(0)
+            val skippedAtomic = AtomicInteger(0)
+            // Collect per-app extra metadata for app_details.json
+            val perAppExtraMap = ConcurrentHashMap<String, PerAppExtra>()
+
+            coroutineScope {
+                backupTargets
+                    .mapIndexed { index, app ->
+                        async {
+                            semaphore.withPermit {
+                                ensureActive()
+                                val pkgName = app.packageName.value
+                                val appDir = File(backupRoot, pkgName)
+                                appDir.mkdirs()
+
+                                // ── Incremental check: compare APK version ──
+                                val oldEntry = oldMetaJson.optJSONObject(pkgName)
+                                val oldApkVersion = oldEntry?.optString("apk_version", null)
+                                var installedVersion: String? = null
+                                var apkChanged = true
+                                if (oldApkVersion != null) {
+                                    val vResult = RootShell.exec("dumpsys package '$pkgName' | grep versionCode | head -1")
+                                    installedVersion =
+                                        vResult.output
+                                            .substringAfter("versionCode=")
+                                            .substringBefore(" ")
+                                            .filter { it.isDigit() }
+                                            .takeIf { it.isNotEmpty() }
+                                    if (installedVersion != null && oldApkVersion == installedVersion) {
+                                        apkChanged = false
+                                        Log.d(TAG, "backupApps: $pkgName APK $oldApkVersion unchanged, skipping")
+                                    }
+                                }
+
+                                // 1. Backup APK (only if version changed)
+                                if (apkChanged) {
+                                    emit(BackupProgress(index + 1, totalCount, pkgName, "apk", "正在备份 APK…"))
+                                    val paths = AppScanner.getApkPaths(pkgName)
+                                    if (paths.isNotEmpty()) {
+                                        val cpOk =
+                                            paths.withIndex().all { (i, apkPath) ->
+                                                val destName = if (paths.size > 1) "${pkgName}_split_$i.apk" else "$pkgName.apk"
+                                                RootShell
+                                                    .exec(
+                                                        "cp '${apkPath.shellEscape()}' '${appDir.absolutePath.shellEscape()}/${destName.shellEscape()}'",
+                                                    ).isSuccess
+                                            }
+                                        if (!cpOk) LogUtil.w(TAG, "backupApps: APK cp failed for $pkgName, continuing")
+                                    }
+                                } else {
+                                    skippedAtomic.incrementAndGet()
+                                    emit(BackupProgress(index + 1, totalCount, pkgName, "apk", "APK无变化，跳过"))
+                                }
+
+                                // Keystore check
+                                val hasKeystore = AppScanner.hasKeystore(pkgName)
+                                if (hasKeystore) emit(BackupProgress(index + 1, totalCount, pkgName, "data", "⚠ 包含密钥库条目"))
+
+                                // ── Size-based data incremental skip ──
+                                var skipData = false
+                                if (!apkChanged) {
+                                    // APK unchanged: check if data sizes match
+                                    val oldUserSize =
+                                        try {
+                                            oldEntry?.optJSONObject("user")?.optString("Size", null)?.toLongOrNull()
+                                        } catch (
+                                            _: Exception,
+                                        ) {
+                                            null
+                                        }
+                                    val oldObbSize =
+                                        try {
+                                            oldEntry?.optJSONObject("obb")?.optString("Size", null)?.toLongOrNull()
+                                        } catch (
+                                            _: Exception,
+                                        ) {
+                                            null
+                                        }
+                                    if (oldUserSize != null || oldObbSize != null) {
+                                        skipData = true
+                                        Log.d(TAG, "backupApps: $pkgName data sizes known from backup, will compare after tar")
+                                    }
+                                }
+
+                                // ── Per-app size tracking ──
+                                var userSize: Long? = null
+                                var userDeSize: Long? = null
+                                var dataSize: Long? = null
+                                var obbSize: Long? = null
+
+                                // Force-stop before data backup for consistency
+                                // 排除应用自身（避免自杀）和已知常驻应用
+                                if (config.backupMode == 1 && !skipData) {
+                                    if (pkgName !in listOf("bin.mt.plus", "com.termux", "bin.mt.plus.canary", context.packageName)) {
+                                        RootShell.exec("am force-stop --user $userId '$pkgName' 2>/dev/null")
+                                    }
+                                }
+
+                                // 2. Backup user data
+                                if (config.backupMode == 1 && config.backupUserData == 1 && !skipData) {
+                                    if (pkgName in noDataBackup) {
+                                        emit(BackupProgress(index + 1, totalCount, pkgName, "data", "跳过数据备份（已排除）"))
+                                    } else {
+                                        emit(BackupProgress(index + 1, totalCount, pkgName, "data", "正在备份数据…"))
+                                        val udResult = backupUserData(context, pkgName, appDir, userId, config.compressionMethod)
+                                        userSize = udResult.first
+                                        userDeSize = udResult.second
+                                        if (udResult.first == null) {
+                                            failAtomic.incrementAndGet()
+                                            emit(BackupProgress(index + 1, totalCount, pkgName, "done", "数据备份失败"))
+                                            return@withPermit
+                                        }
+                                    }
+                                } else if (skipData) {
+                                    emit(BackupProgress(index + 1, totalCount, pkgName, "data", "数据无变化，跳过"))
+                                }
+
+                                // 3. Backup OBB
+                                if (config.backupMode == 1 && config.backupObbData == 1 && !skipData) {
+                                    val hasObb = AppScanner.hasObbData(pkgName)
+                                    if (hasObb) {
+                                        emit(BackupProgress(index + 1, totalCount, pkgName, "obb", "正在备份 OBB…"))
+                                        obbSize = backupObb(pkgName, appDir, config.compressionMethod)
+                                        if (obbSize == null) {
+                                            failAtomic.incrementAndGet()
+                                            emit(BackupProgress(index + 1, totalCount, pkgName, "done", "OBB 备份失败"))
+                                            return@withPermit
+                                        }
+                                    }
+                                }
+
+                                // 3.5 Backup external data
+                                if (config.backupMode == 1 && config.backupUserData == 1 && !skipData) {
+                                    if (pkgName !in noDataBackup) {
+                                        emit(BackupProgress(index + 1, totalCount, pkgName, "data", "正在备份外部数据…"))
+                                        dataSize = backupExternalData(pkgName, appDir, userId, config.compressionMethod)
+                                    }
+                                }
+
+                                // 4. Backup SSAID
+                                emit(BackupProgress(index + 1, totalCount, pkgName, "ssaid", "正在备份 SSAID…"))
+                                backupSsaid(pkgName, appDir, userId)
+
+                                // Icon + permissions (always, for completeness)
+                                val iconPath = AppScanner.extractIcon(pkgName, appDir, app.userId.value)
+                                if (iconPath != null) Log.d(TAG, "backupApps: saved icon for $pkgName -> $iconPath")
+                                backupPermissions(pkgName, appDir)
+
+                                // Save per-app metadata for enhanced app_details.json
+                                val ssaidValue = readTextFile(File(appDir, "ssaid.txt"))?.trim()
+                                val permText = readTextFile(File(appDir, "permissions.txt"))
+                                val permissionsJson =
+                                    if (permText != null) {
+                                        try {
+                                            val parsed = JSONObject()
+                                            permText.lines().forEach { line ->
+                                                val name = line.substringBefore(":").trim()
+                                                val granted = line.contains("granted=true")
+                                                if (name.contains(".")) parsed.put(name, if (granted) "granted:true" else "granted:false")
+                                            }
+                                            parsed
+                                        } catch (_: Exception) {
+                                            null
+                                        }
+                                    } else {
+                                        null
+                                    }
+
+                                perAppExtraMap[pkgName] =
+                                    PerAppExtra(
+                                        ssaid = ssaidValue,
+                                        permissions = permissionsJson,
+                                        keystore = hasKeystore,
+                                        userSize = userSize,
+                                        userDeSize = userDeSize,
+                                        dataSize = dataSize,
+                                        obbSize = obbSize,
+                                    )
+
+                                successAtomic.incrementAndGet()
+                                emit(BackupProgress(index + 1, totalCount, pkgName, "done", "完成"))
+                            }
+                        }
+                    }.awaitAll()
+            }
+
+            val elapsed = System.currentTimeMillis() - startTime
+            RootShell.exec("chmod -R 0755 '${backupRoot.absolutePath}'")
+
+            val successCount = successAtomic.get()
+            val failCount = failAtomic.get()
+            val skippedCount = skippedAtomic.get()
+
+            LogUtil.i(TAG, "backupApps: completed — success=$successCount fail=$failCount skipped=$skippedCount elapsed=${elapsed}ms")
+
+            // Re-write metadata files with enhanced app_details.json (includes per-app extas)
+            val metaJson = buildAppDetailsJson(apps, legacyApps, perAppExtraMap.ifEmpty { null })
+            writeFileForBackup(File(backupRoot, "app_details.json"), metaJson)
+
+            BackupResult(
+                successCount = successCount,
+                failCount = failCount,
+                skippedCount = skippedCount,
+                outputDir = backupRoot.absolutePath,
+                elapsedMs = elapsed,
+            )
         }
 
-        val elapsed = System.currentTimeMillis() - startTime
-        RootShell.exec("chmod -R 0755 '${backupRoot.absolutePath}'")
-
-        BackupResult(
-            successCount = successAtomic.get(),
-            failCount = failAtomic.get(),
-            skippedCount = skippedAtomic.get(),
-            outputDir = backupRoot.absolutePath,
-            elapsedMs = elapsed
-        )
-    }
-
-
-    private suspend fun backupUserData(
+    /**
+     * 备份单个应用的用户数据（/data/data + /data/user_de）。
+     *
+     * 使用 tar + zstd/gzip 创建应用数据存档，支持 3 种回退策略：
+     * 1. 通过 nsenter 直接 tar
+     * 2. 直接 tar 路径（跳过 test -d）
+     * 3. 通过 /proc/1/root 全局挂载命名空间
+     *
+     * @return Pair(userSize, userDeSize)，任一失败时为 null
+     */
+    internal suspend fun backupUserData(
+        context: android.content.Context,
         packageName: String,
         appDir: File,
         userId: String,
-        compression: String
-    ): Boolean {
+        compression: String,
+    ): Pair<Long?, Long?> {
         val pkgEsc = packageName.shellEscape()
         val outputFile = "${appDir.absolutePath.shellEscape()}/${pkgEsc}_data.tar"
-        val isZstd = compression == "zstd"
+
+        // Resolve bundled binary paths (fall back to system PATH if not bundled)
+        val bundledTar = BinaryResolver.tarPath(context)
+        val tarCmd = bundledTar ?: "tar"
+
+        var isZstd = compression == "zstd"
+        val bundledZstd = if (isZstd) BinaryResolver.zstdPath(context) else null
+        val zstdCmd = bundledZstd ?: "zstd"
+        if (isZstd && bundledZstd == null) {
+            val zstdCheck = RootShell.exec("$zstdCmd --version 2>/dev/null")
+            if (!zstdCheck.isSuccess) {
+                Log.w(TAG, "backupUserData: zstd not available, falling back to gzip")
+                isZstd = false
+            }
+        }
         val archiveExt = if (isZstd) ".zst" else ".gz"
         val archiveRaw = File(appDir, "${packageName}_data.tar$archiveExt")
 
-        Log.d(TAG, "backupUserData: $packageName checking dirs")
+        // Helper: check file exists and has size > 0, using root shell for FUSE paths
+        suspend fun archiveHasData(): Boolean =
+            BackupOperation.backupPathExists(archiveRaw) &&
+                (archiveRaw.length() > 0 || BackupOperation.backupFileSize(archiveRaw) > 0L)
+
+        Log.d(TAG, "backupUserData: $packageName checking dirs (tar=$tarCmd zstd=$zstdCmd)")
 
         val rawPkg = packageName
         val dataPaths = listOf("/data/data/$rawPkg", "/data/user_de/$userId/$rawPkg")
+        val dataExcludes = listOf(".ota", "cache", "lib", "code_cache", "no_backup")
 
-        // 1. Try direct paths (app's mount namespace)
-        val dirs = dataPaths.filter { RootShell.exec("test -d $it").isSuccess }.toMutableList()
-        var result: RootShell.ShellResult? = null
+        // 1. Try direct paths after nsenter namespace switch
         var archiveCreated = false
+        var result: RootShell.ShellResult? = null
 
+        val dirs = dataPaths.filter { RootShell.exec("test -d '${it.shellEscape()}'").isSuccess }.toMutableList()
         if (dirs.isNotEmpty()) {
             Log.d(TAG, "backupUserData: $packageName test -d found dirs=$dirs")
-            result = runTar(dirs, outputFile, isZstd)
-            archiveCreated = result?.isSuccess == true
+            result = runTar(dirs, outputFile, isZstd, tarCmd, zstdCmd, excludes = dataExcludes)
+            archiveCreated = archiveHasData()
+            Log.d(TAG, "backupUserData: $packageName step1 exit=${result?.exitCode} err='${result?.error?.take(100)}'")
         } else {
-            // 2. Try tar directly on direct paths (may fail in isolated namespace)
             Log.d(TAG, "backupUserData: $packageName test -d all failed, trying tar directly")
-            result = runTar(dataPaths, outputFile, isZstd)
-            archiveCreated = result?.isSuccess == true || (archiveRaw.exists() && archiveRaw.length() > 0)
+            result = runTar(dataPaths, outputFile, isZstd, tarCmd, zstdCmd, excludes = dataExcludes)
+            archiveCreated = archiveHasData()
+            Log.d(TAG, "backupUserData: $packageName step2 exit=${result?.exitCode} err='${result?.error?.take(100)}'")
         }
 
-        // 3. If still failed, try via /proc/1/root (global mount namespace)
-        //    Use cd to avoid tar packing the /proc/1/root/ prefix into the archive.
+        // 3. Fallback via /proc/1/root (global mount namespace)
         if (!archiveCreated) {
-            Log.w(TAG, "backupUserData: $packageName direct access failed, trying via /proc/1/root (global namespace)")
-            val globalRelPaths = dataPaths.map { it.removePrefix("/") }  // e.g. "data/data/tv.danmaku.bili"
-            val excludeArgs = "--exclude='cache' --exclude='code_cache' --exclude='lib' --exclude='no_backup'"
-            val globalCmd = if (isZstd) {
-                "cd /proc/1/root && tar $excludeArgs -cf - ${globalRelPaths.joinToString(" ")} 2>/dev/null | zstd -T0 -o '$outputFile.zst'"
-            } else {
-                "cd /proc/1/root && tar $excludeArgs -czf '$outputFile.gz' ${globalRelPaths.joinToString(" ")} 2>/dev/null"
-            }
+            Log.w(TAG, "backupUserData: $packageName step3 trying /proc/1/root")
+            val globalRelPaths = dataPaths.map { it.removePrefix("/") }
+            val globalCmd =
+                if (isZstd) {
+                    "cd /proc/1/root && set -o pipefail; $tarCmd --exclude='.ota' --exclude='cache' --exclude='code_cache' --exclude='lib' --exclude='no_backup' -cf - ${globalRelPaths.joinToString(
+                        " ",
+                    ) { "'${it.shellEscape()}'" }} 2>/dev/null | $zstdCmd -T0 -o '$outputFile.zst'"
+                } else {
+                    "cd /proc/1/root && $tarCmd --exclude='.ota' --exclude='cache' --exclude='code_cache' --exclude='lib' --exclude='no_backup' -czf '$outputFile.gz' ${globalRelPaths.joinToString(
+                        " ",
+                    ) { "'${it.shellEscape()}'" }} 2>/dev/null"
+                }
             result = RootShell.exec(globalCmd)
-            archiveCreated = result?.isSuccess == true || (archiveRaw.exists() && archiveRaw.length() > 0)
+            archiveCreated = archiveHasData()
+            Log.d(TAG, "backupUserData: $packageName step3 exit=${result?.exitCode} err='${result?.error?.take(100)}'")
         }
 
-        // 4. Last resort: try su -Z (Magisk SELinux context switch) — on Magisk 30+,
-        //    the app's su context (untrusted_app) cannot see other apps' /data/data/.
-        //    Switching to u:r:magisk:s0 lifts the SELinux restriction.
         if (!archiveCreated) {
-            Log.w(TAG, "backupUserData: $packageName /proc/1/root failed, trying su -Z magisk context")
-            val excludeArgs = "--exclude='cache' --exclude='code_cache' --exclude='lib' --exclude='no_backup'"
-            val dirList = dataPaths.joinToString(" ")
-            val rawOut = appDir.absolutePath + "/" + packageName + "_data.tar"
-            val innerCmd = if (isZstd) {
-                "tar $excludeArgs -cf - $dirList 2>/dev/null | zstd -T0 -o '${rawOut}.zst'"
+            LogUtil.w(TAG, "backupUserData: $packageName all methods failed — no data dirs (or inaccessible)")
+            return null to null
+        }
+
+        // Verify compression integrity
+        val verifyOk =
+            if (isZstd) {
+                RootShell.exec("$zstdCmd -t '$outputFile.zst' 2>/dev/null").isSuccess
             } else {
-                "tar $excludeArgs -czf '${rawOut}.gz' $dirList 2>/dev/null"
+                RootShell.exec("gzip -t '$outputFile.gz' 2>/dev/null").isSuccess
             }
-            result = RootShell.exec("su -Z u:r:magisk:s0 -c \"$innerCmd\" 2>/dev/null")
-            archiveCreated = result?.isSuccess == true || (archiveRaw.exists() && archiveRaw.length() > 0)
-        }
-
-        if (!archiveCreated) {
-            Log.w(TAG, "backupUserData: $packageName all methods failed — no data dirs to backup (or inaccessible)")
-            return true
-        }
-        // Verify integrity
-        val verifyOk = if (isZstd) {
-            RootShell.exec("zstd -t '$outputFile.zst' 2>/dev/null").isSuccess
-        } else {
-            RootShell.exec("gzip -t '$outputFile.gz' 2>/dev/null").isSuccess
-        }
         if (!verifyOk) {
             Log.e(TAG, "backupUserData: $packageName integrity check FAILED")
+            return null to null
         }
-        return verifyOk
+
+        // Validate tar archive structure
+        val tarValidateOk =
+            if (isZstd) {
+                RootShell.exec("$zstdCmd -d -c '$outputFile.zst' 2>/dev/null | tar -tf - > /dev/null 2>&1").isSuccess
+            } else {
+                RootShell.exec("tar -tf '$outputFile.gz' > /dev/null 2>&1").isSuccess
+            }
+        if (!tarValidateOk) {
+            Log.e(TAG, "backupUserData: $packageName tar archive structure validation FAILED")
+            return null to null
+        }
+        return archiveRaw.length() to 0L // Return (userSize, userDeSize) — combined in one file
     }
 
-    /** Run tar for given paths, building the appropriate zstd/gzip command. */
-    private suspend fun runTar(
+    /**
+     * 运行 tar 命令，自动选择 zstd 或 gzip 压缩。
+     */
+    internal suspend fun runTar(
         dirs: List<String>,
         outputFile: String,
-        isZstd: Boolean
+        isZstd: Boolean,
+        tarCmd: String = "tar",
+        zstdCmd: String = "zstd",
+        excludes: List<String> = emptyList(),
     ): RootShell.ShellResult {
-        val excludeArgs = "--exclude='cache' --exclude='code_cache' --exclude='lib' --exclude='no_backup'"
-        val dirList = dirs.joinToString(" ")
+        val excludeArgs =
+            if (excludes.isNotEmpty()) {
+                excludes.joinToString(" ") { "--exclude='${it.shellEscape()}'" }
+            } else {
+                ""
+            }
         return if (isZstd) {
-            RootShell.exec("tar $excludeArgs -cf - $dirList 2>/dev/null | zstd -T0 -o '$outputFile.zst'")
+            RootShell.exec(
+                "set -o pipefail; $tarCmd -cf - $excludeArgs ${dirs.joinToString(
+                    " ",
+                ) { "'${it.shellEscape()}'" }} 2>/dev/null | $zstdCmd -T0 -o '$outputFile.zst'",
+            )
         } else {
-            RootShell.exec("tar $excludeArgs -czf '$outputFile.gz' $dirList 2>/dev/null")
+            RootShell.exec("$tarCmd -czf $excludeArgs '$outputFile.gz' ${dirs.joinToString(" ") { "'${it.shellEscape()}'" }} 2>/dev/null")
         }
     }
 
-    private suspend fun backupObb(packageName: String, appDir: File, compression: String): Boolean {
+    /**
+     * 备份单个应用的 OBB 数据文件夹。
+     * @return obbSize 或 null（失败时）
+     */
+    internal suspend fun backupObb(
+        packageName: String,
+        appDir: File,
+        compression: String,
+    ): Long? {
         val obbDir = "/storage/emulated/0/Android/obb/${packageName.shellEscape()}"
         val escapedAppDir = appDir.absolutePath.shellEscape()
         val escapedPkg = packageName.shellEscape()
-        val result = when (compression) {
-            "zstd" -> RootShell.exec("tar -cf - '$obbDir' 2>/dev/null | zstd -T0 -o '$escapedAppDir/${escapedPkg}_obb.tar.zst'")
-            else -> RootShell.exec("tar -czf '$escapedAppDir/${escapedPkg}_obb.tar.gz' '$obbDir' 2>/dev/null")
-        }
+        // Exclude cache and backup temp files from OBB archive
+        val obbExcludes = "--exclude='cache' --exclude='Backup_*'"
+        val result =
+            when (compression) {
+                "zstd" -> {
+                    RootShell.exec(
+                        "set -o pipefail; tar -cf - $obbExcludes '$obbDir' 2>/dev/null | zstd -T0 -o '$escapedAppDir/${escapedPkg}_obb.tar.zst'",
+                    )
+                }
+
+                else -> {
+                    RootShell.exec("tar -czf $obbExcludes '$escapedAppDir/${escapedPkg}_obb.tar.gz' '$obbDir' 2>/dev/null")
+                }
+            }
         if (!result.isSuccess) {
             Log.e(TAG, "Failed to backup OBB for $packageName: exit=${result.exitCode} err=${result.error}")
-            return false
+            return null
         }
-        val archive = if (compression == "zstd") "$escapedAppDir/${escapedPkg}_obb.tar.zst" else "$escapedAppDir/${escapedPkg}_obb.tar.gz"
-        val verifyCmd = if (compression == "zstd") "zstd -t '$archive' 2>/dev/null" else "gzip -t '$archive' 2>/dev/null"
+        val obbArchiveExt = if (compression == "zstd") ".zst" else ".gz"
+        val obbFile = File(appDir, "${packageName}_obb.tar$obbArchiveExt")
+        val obbArchivePath = obbFile.absolutePath.shellEscape()
+        val verifyCmd = if (compression == "zstd") "zstd -t '$obbArchivePath' 2>/dev/null" else "gzip -t '$obbArchivePath' 2>/dev/null"
         val verificationOk = RootShell.exec(verifyCmd).isSuccess
         if (!verificationOk) {
             Log.e(TAG, "OBB archive integrity check FAILED for $packageName")
         }
-        return verificationOk
+        // Validate OBB tar structure
+        val tarListCmd =
+            if (compression == "zstd") {
+                "zstd -d -c '$obbArchivePath' 2>/dev/null | tar -tf - > /dev/null 2>&1"
+            } else {
+                "tar -tf '$obbArchivePath' > /dev/null 2>&1"
+            }
+        val tarOk = RootShell.exec(tarListCmd).isSuccess
+        if (!tarOk) {
+            Log.e(TAG, "OBB tar structure validation FAILED for $packageName")
+        }
+        return if (verificationOk && tarOk) BackupOperation.backupFileSize(obbFile) else null
     }
 
-    private suspend fun backupSsaid(packageName: String, appDir: File, userId: String) {
+    /**
+     * 备份单个应用的外部数据目录（/data/media/<userId>/Android/data/<pkg>）。
+     * @return dataSize 或 null（目录不存在或失败）
+     */
+    internal suspend fun backupExternalData(
+        packageName: String,
+        appDir: File,
+        userId: String,
+        compression: String,
+    ): Long? {
+        val pkgEsc = packageName.shellEscape()
+        val externalDataDir = "/data/media/$userId/Android/data/$pkgEsc"
+
+        // Check if the directory exists
+        val checkResult = RootShell.exec("test -d '$externalDataDir' && echo 1 || echo 0")
+        if (checkResult.output.trim() != "1") {
+            Log.d(TAG, "backupExternalData: $packageName — no external data dir at $externalDataDir")
+            return 0L // Not an error, just no data
+        }
+
+        val archiveExt = if (compression == "zstd") ".zst" else ".gz"
+        val archiveFile = File(appDir, "${packageName}_external_data.tar$archiveExt")
+        val archivePath = archiveFile.absolutePath.shellEscape()
+        val dataExcludes = "--exclude='cache' --exclude='Backup_*' --exclude='.ota'"
+
+        val result =
+            if (compression == "zstd") {
+                RootShell.exec(
+                    "set -o pipefail; tar -cf - $dataExcludes '$externalDataDir' 2>/dev/null | zstd -T0 -o '$archivePath'",
+                )
+            } else {
+                RootShell.exec("tar -czf $dataExcludes '$archivePath' '$externalDataDir' 2>/dev/null")
+            }
+
+        if (!result.isSuccess) {
+            Log.w(TAG, "backupExternalData: $packageName tar failed: ${result.error}")
+            return null
+        }
+
+        // Verify compression integrity
+        val verifyCmd = if (compression == "zstd") "zstd -t '$archivePath' 2>/dev/null" else "gzip -t '$archivePath' 2>/dev/null"
+        val verificationOk = RootShell.exec(verifyCmd).isSuccess
+        if (!verificationOk) {
+            Log.e(TAG, "backupExternalData: $packageName integrity check FAILED")
+            return null
+        }
+
+        // Validate tar structure
+        val tarListCmd =
+            if (compression == "zstd") {
+                "zstd -d -c '$archivePath' 2>/dev/null | tar -tf - > /dev/null 2>&1"
+            } else {
+                "tar -tf '$archivePath' > /dev/null 2>&1"
+            }
+        val tarOk = RootShell.exec(tarListCmd).isSuccess
+        if (!tarOk) {
+            Log.e(TAG, "backupExternalData: $packageName tar structure validation FAILED")
+            return null
+        }
+
+        Log.i(TAG, "backupExternalData: $packageName backed up (size=${archiveFile.length()})")
+        return BackupOperation.backupFileSize(archiveFile)
+    }
+
+    /**
+     * 备份单个应用的 SSAID（设置安全标识符）。
+     * 从 settings_ssaid.xml 中提取。
+     */
+    internal suspend fun backupSsaid(
+        packageName: String,
+        appDir: File,
+        userId: String,
+    ) {
         val ssaidFile = "/data/system/users/${userId.shellEscape()}/settings_ssaid.xml"
-        val result = RootShell.exec("grep '${packageName.shellEscape()}' '$ssaidFile' 2>/dev/null")
-        if (result.output.isNotBlank()) {
-            File(appDir, "ssaid.txt").writeText(result.output)
+        // Parse XML value attribute for this package's SSAID entry
+        val result = RootShell.exec("cat '$ssaidFile' 2>/dev/null")
+        if (!result.isSuccess || result.output.isBlank()) return
+        val ssaidLine =
+            result.output.lines().firstOrNull { line ->
+                line.contains("packageName=\"$packageName\"") || line.contains("packageName='$packageName'")
+            }
+        val value =
+            ssaidLine
+                ?.substringAfter("value=\"")
+                ?.substringBefore("\"")
+                ?.takeIf { it.isNotBlank() }
+        if (value != null) {
+            val ssaidFile = File(appDir, "ssaid.txt")
+            if (!writeFileForBackup(ssaidFile, value)) {
+                Log.w(TAG, "backupSsaid: failed to write ssaid.txt for $packageName")
+            } else {
+                Log.d(TAG, "backupSsaid: backed up SSAID for $packageName = $value")
+            }
         }
     }
 
-    private suspend fun backupPermissions(packageName: String, appDir: File) {
+    /**
+     * 备份单个应用的运行时权限状态。
+     */
+    internal suspend fun backupPermissions(
+        packageName: String,
+        appDir: File,
+    ) {
         val result = RootShell.exec("dumpsys package '${packageName.shellEscape()}' | grep -E 'granted=(true|false)'")
         if (result.output.isNotBlank()) {
-            File(appDir, "permissions.txt").writeText(result.output)
+            val permFile = File(appDir, "permissions.txt")
+            if (!writeFileForBackup(permFile, result.output)) {
+                Log.w(TAG, "backupPermissions: failed to write permissions.txt for $packageName")
+            }
         }
     }
 
-    private fun buildAppDetailsJson(apps: List<AppInfo>): String {
+    internal suspend fun buildAppDetailsJson(
+        apps: List<AppInfo>,
+        legacyApps: Map<String, SnapshotAppInfo>? = null,
+        perAppExtra: Map<String, PerAppExtra>? = null,
+    ): String {
         val root = JSONObject()
+        val now = java.text.SimpleDateFormat("yyyy.MM.dd HH:mm:ss", java.util.Locale.US).format(java.util.Date())
         for (app in apps) {
             val entry = JSONObject()
             entry.put("label", app.label)
             entry.put("isSystem", app.isSystem)
-            root.put(app.packageName, entry)
+            entry.put("PackageName", app.packageName.value)
+
+            // APK versionCode for incremental skip
+            val versionResult = RootShell.exec("dumpsys package '${app.packageName.value.shellEscape()}' | grep versionCode | head -1")
+            val apkVersion =
+                versionResult.output
+                    .substringAfter("versionCode=")
+                    .substringBefore(" ")
+                    .filter { it.isDigit() }
+                    .takeIf { it.isNotEmpty() }
+            if (apkVersion != null) entry.put("apk_version", apkVersion)
+
+            // APK file sizes
+            val paths = AppScanner.getApkPaths(app.packageName.value)
+            val sizes =
+                paths.map { path ->
+                    val result = RootShell.exec("stat -c%s '${path.shellEscape()}'")
+                    if (result.isSuccess) result.output.trim().toLongOrNull() ?: 0L else 0L
+                }
+            entry.put("apkSizes", JSONArray(sizes))
+
+            // Per-app extra data collected during backup
+            val extra = perAppExtra?.get(app.packageName.value)
+            if (extra != null) {
+                if (extra.ssaid != null) entry.put("Ssaid", extra.ssaid)
+                if (extra.permissions != null) entry.put("permissions", extra.permissions)
+                if (extra.keystore) entry.put("keystore", "true")
+
+                fun putSize(
+                    key: String,
+                    value: Long?,
+                ) {
+                    if (value != null) {
+                        val obj = JSONObject()
+                        obj.put("Size", value.toString())
+                        entry.put(key, obj)
+                    }
+                }
+                putSize("user", extra.userSize)
+                putSize("user_de", extra.userDeSize)
+                putSize("data", extra.dataSize)
+                putSize("obb", extra.obbSize)
+            }
+
+            val timeObj = JSONObject()
+            timeObj.put("date", now)
+            entry.put("Backup time", timeObj)
+
+            root.put(app.packageName.value, entry)
+        }
+        // Legacy apps from previous snapshot
+        val legacyMap = legacyApps ?: emptyMap()
+        for ((pkg, legacy) in legacyMap) {
+            if (!root.has(pkg)) {
+                val entry = JSONObject()
+                entry.put("label", legacy.label)
+                entry.put("isSystem", legacy.isSystem)
+                entry.put("apkSizes", JSONArray(legacy.apkSizes))
+                root.put(pkg, entry)
+            }
         }
         return root.toString(2)
     }
+
+    /**
+     * Per-app extra metadata collected during backup write phase.
+     */
+    internal data class PerAppExtra(
+        val ssaid: String? = null,
+        val permissions: org.json.JSONObject? = null,
+        val keystore: Boolean = false,
+        val userSize: Long? = null,
+        val userDeSize: Long? = null,
+        val dataSize: Long? = null,
+        val obbSize: Long? = null,
+    )
+
+    /** Create backup output directory, falling back to root shell [mkdir -p]. */
+    internal suspend fun mkdirsForBackup(dir: File): Boolean {
+        if (dir.isDirectory) return true
+        if (dir.mkdirs()) return true
+        val result = RootShell.exec("mkdir -p '${dir.absolutePath.shellEscape()}'")
+        return result.isSuccess && dir.isDirectory
+    }
+
+    /** Write text to a file, falling back to root shell (base64 + cat). */
+    internal suspend fun writeFileForBackup(
+        file: File,
+        text: String,
+    ): Boolean {
+        try {
+            mkdirsForBackup(file.parentFile ?: return false)
+            file.writeText(text)
+            return true
+        } catch (_: Exception) {
+            // fall through
+        }
+        try {
+            mkdirsForBackup(file.parentFile ?: return false)
+            val b64 = android.util.Base64.encodeToString(text.toByteArray(), android.util.Base64.NO_WRAP)
+            val result = RootShell.exec("echo '${b64.shellEscape()}' | base64 -d > '${file.absolutePath.shellEscape()}'")
+            return result.isSuccess
+        } catch (e: Exception) {
+            Log.w(TAG, "writeFileForBackup: all methods failed for ${file.absolutePath}", e)
+            return false
+        }
+    }
+
+    /** Read file content, falling back to root shell [cat]. Returns null on failure. */
+    internal suspend fun readTextFile(file: File): String? {
+        try {
+            if (file.exists()) return file.readText()
+        } catch (_: Exception) {
+            // fall through
+        }
+        try {
+            val result = RootShell.exec("cat '${file.absolutePath.shellEscape()}' 2>/dev/null")
+            if (result.isSuccess && result.output.isNotBlank()) return result.output
+        } catch (_: Exception) {
+            // fall through
+        }
+        return null
+    }
+
+    /** Check if a path is a directory, falling back to root shell [test -d]. */
+    internal suspend fun backupIsDirectory(dir: File): Boolean {
+        if (dir.isDirectory()) return true
+        val result = RootShell.exec("test -d '${dir.absolutePath.shellEscape()}' && echo 1 || echo 0")
+        return result.output.trim() == "1"
+    }
+
+    /** Get file size via root shell [stat] when Java File.length() returns 0 on FUSE. */
+    internal suspend fun backupFileSize(file: File): Long {
+        val javaSize = file.length()
+        if (javaSize > 0L) return javaSize
+        val result = RootShell.exec("stat -c%s '${file.absolutePath.shellEscape()}' 2>/dev/null")
+        return result.output.trim().toLongOrNull() ?: 0L
+    }
+
+    /** Check if a file/directory exists, falling back to root shell [test -e]. */
+    internal suspend fun backupPathExists(file: File): Boolean {
+        if (file.exists()) return true
+        val result = RootShell.exec("test -e '${file.absolutePath.shellEscape()}' && echo 1 || echo 0")
+        return result.output.trim() == "1"
+    }
+
+    /**
+     * List immediate children in a directory, falling back to root shell [ls -1].
+     * Returns relative names only (not full paths).
+     */
+    internal suspend fun listBackupFiles(dir: File): List<String>? {
+        try {
+            val javaFiles = dir.listFiles()
+            if (javaFiles != null) {
+                val names = javaFiles.map { it.name }
+                if (names.isNotEmpty()) return names
+            }
+        } catch (_: Exception) {
+            // fall through
+        }
+        try {
+            val result = RootShell.exec("ls -1 '${dir.absolutePath.shellEscape()}' 2>/dev/null")
+            if (!result.isSuccess || result.output.isBlank()) return null
+            return result.output.lines().filter { it.isNotBlank() }
+        } catch (_: Exception) {
+            return null
+        }
+    }
 }

app/src/main/java/com/example/androidbackupgui/backup/BackupService.kt

@@ -0,0 +1,73 @@
+package com.example.androidbackupgui.backup
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.Service
+import android.content.Intent
+import android.os.Build
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+
+/**
+ * Foreground service to keep the process alive during long backup/restore operations.
+ * Prevents Android from killing the app during extended operations.
+ */
+class BackupService : Service() {
+
+    companion object {
+        const val CHANNEL_ID = "backup_service_channel"
+        const val NOTIFICATION_ID = 1001
+        const val ACTION_START_BACKUP = "com.example.androidbackupgui.action.START_BACKUP"
+        const val ACTION_STOP_BACKUP = "com.example.androidbackupgui.action.STOP_BACKUP"
+        const val EXTRA_STATUS_TEXT = "status_text"
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        createNotificationChannel()
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        when (intent?.action) {
+            ACTION_START_BACKUP -> {
+                val statusText = intent.getStringExtra(EXTRA_STATUS_TEXT) ?: "正在备份…"
+                val notification = createNotification(statusText)
+                startForeground(NOTIFICATION_ID, notification)
+            }
+            ACTION_STOP_BACKUP -> {
+                stopForeground(STOP_FOREGROUND_REMOVE)
+                stopSelf()
+            }
+        }
+        return START_NOT_STICKY
+    }
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    private fun createNotificationChannel() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val channel = NotificationChannel(
+                CHANNEL_ID,
+                "备份服务",
+                NotificationManager.IMPORTANCE_LOW
+            ).apply {
+                description = "后台备份任务持续运行通知"
+                setShowBadge(false)
+            }
+            val manager = getSystemService(NotificationManager::class.java)
+            manager.createNotificationChannel(channel)
+        }
+    }
+
+    private fun createNotification(text: String): Notification {
+        return NotificationCompat.Builder(this, CHANNEL_ID)
+            .setContentTitle("Android Backup")
+            .setContentText(text)
+            .setSmallIcon(android.R.drawable.ic_menu_upload)
+            .setOngoing(true)
+            .setSilent(true)
+            .setPriority(NotificationCompat.PRIORITY_LOW)
+            .build()
+    }
+}

app/src/main/java/com/example/androidbackupgui/backup/BinaryResolver.kt

@@ -0,0 +1,49 @@
+package com.example.androidbackupgui.backup
+
+import android.content.Context
+import android.util.Log
+import java.io.File
+
+/**
+ * Resolves paths to binaries bundled in jniLibs.
+ * Android's PackageManager extracts lib*.so from jniLibs to nativeLibraryDir.
+ * We copy them to app-private dir (writable, executable) for ProcessBuilder use.
+ */
+object BinaryResolver {
+    private const val TAG = "BinaryResolver"
+
+    private var tarPath: String? = null
+    private var zstdPath: String? = null
+
+    fun tarPath(context: Context): String? = cacheOrResolve(context, "libtar_bin.so", "tar_bin", ::tarPath) { tarPath = it }
+    fun zstdPath(context: Context): String? = cacheOrResolve(context, "libzstd_bin.so", "zstd_bin", ::zstdPath) { zstdPath = it }
+
+    private fun cacheOrResolve(
+        context: Context, libName: String, destName: String,
+        cache: () -> String?, setCache: (String?) -> Unit
+    ): String? {
+        val cached = cache()
+        if (cached != null) return cached
+        val resolved = resolve(context, libName, destName)
+        setCache(resolved)
+        return resolved
+    }
+
+    private fun resolve(context: Context, libName: String, destName: String): String? {
+        val nativeLibDir = context.applicationInfo.nativeLibraryDir
+        val source = File(nativeLibDir, libName)
+        if (!source.isFile) {
+            Log.e(TAG, "$libName NOT FOUND at ${source.absolutePath}")
+            return null
+        }
+        val dest = File(context.filesDir, "bin/$destName")
+        if (!dest.exists() || dest.length() != source.length() || !dest.canExecute()) {
+            dest.parentFile?.mkdirs()
+            if (dest.exists()) dest.delete()
+            source.inputStream().use { src -> dest.outputStream().use { out -> src.copyTo(out) } }
+            dest.setExecutable(true)
+        }
+        Log.i(TAG, "ready: $libName -> ${dest.absolutePath} (${dest.length()} bytes) canExec=${dest.canExecute()}")
+        return dest.absolutePath
+    }
+}

app/src/main/java/com/example/androidbackupgui/backup/DomainTypes.kt

@@ -0,0 +1,68 @@
+package com.example.androidbackupgui.backup
+
+import kotlinx.serialization.Serializable
+
+/**
+ * 类型安全的包名包装。
+ *
+ * 使用 [value] 获取原始字符串，用于 Android API 调用和 shell 命令。
+ *
+ * 构造函数验证包名格式符合 Android 命名规范（字母开头、包含至少一个点、
+ * 仅包含字母数字下划线连字符和点），以防止注入攻击和防止 shell 转义绕过。
+ *
+ * 如果包名来源不可信，请使用 [PackageName.safe] 安全创建。
+ */
+@JvmInline
+@Serializable
+value class PackageName(
+    val value: String,
+) {
+    init {
+        require(value.isNotBlank()) { "PackageName must not be blank" }
+        require(PACKAGE_NAME_REGEX.matches(value)) {
+            "Invalid Android package name: '$value' - must start with a letter, " +
+                "contain at least one dot, and only [a-zA-Z0-9_-] characters (dot only as separator)"
+        }
+    }
+
+    override fun toString(): String = value
+
+    companion object {
+        /**
+         * Android 包名正则：字母开头、至少一个点、仅允许标准字符。
+         * 此正则与 [restoreSsaid] 中的校验一致。
+         */
+        private val PACKAGE_NAME_REGEX =
+            Regex(
+                "^[a-zA-Z][a-zA-Z0-9_-]*(\\.[a-zA-Z][a-zA-Z0-9_-]*)+" +
+                    "$",
+            )
+
+        /**
+         * 安全创建 [PackageName]，如果包名无效则返回 null。
+         * 适用于外部输入（appList.txt、扫描结果等）的防御性校验。
+         */
+        fun safe(value: String): PackageName? = if (value.isNotBlank() && PACKAGE_NAME_REGEX.matches(value)) PackageName(value) else null
+    }
+}
+
+/**
+ * 类型安全的用户 ID 包装。
+ *
+ * 使用 [value] 获取原始整数值。默认值 0 表示主用户 (Owner)。
+ */
+@JvmInline
+@Serializable
+value class UserId(
+    val value: Int,
+) {
+    init {
+        require(value >= 0) { "UserId must be non-negative, got $value" }
+    }
+
+    override fun toString(): String = value.toString()
+
+    companion object {
+        val Owner = UserId(0)
+    }
+}

app/src/main/java/com/example/androidbackupgui/backup/FormatUtil.kt

@@ -0,0 +1,12 @@
+package com.example.androidbackupgui.backup
+
+import java.util.Locale
+
+/** Format byte count to human-readable string (e.g. "1.5 MB"). */
+fun formatSize(bytes: Long): String {
+    if (bytes < 1024) return "$bytes B"
+    val units = arrayOf("KB", "MB", "GB", "TB")
+    val exp = (63 - bytes.countLeadingZeroBits()) / 10
+    val value = bytes.toDouble() / (1L shl (exp * 10))
+    return "%.1f %s".format(Locale.US, value, units[exp - 1].coerceAtMost(units.last()))
+}

app/src/main/java/com/example/androidbackupgui/backup/LogUtil.kt

@@ -0,0 +1,85 @@
+package com.example.androidbackupgui.backup
+
+import android.util.Log
+import java.io.File
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+import java.util.concurrent.Executors
+
+/**
+ * File-based logger with rotation support.
+ * Writes logs to [baseDir]/logs/YYYY-MM-dd.log, keeping up to [maxDays] days.
+ * Also dispatches to Android Logcat for real-time visibility.
+ */
+object LogUtil {
+
+    private const val TAG = "LogUtil"
+    private const val MAX_DAYS = 7
+
+    private var baseDir: File? = null
+    private val executor = Executors.newSingleThreadExecutor()
+    private val dateFormat = SimpleDateFormat("yyyy-MM-dd", Locale.US)
+    private val timestampFormat = SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS", Locale.US)
+
+    fun init(baseDir: File) {
+        this.baseDir = baseDir
+        executor.execute { rotateLogs() }
+    }
+
+    fun i(tag: String, message: String) {
+        Log.i(tag, message)
+        writeLog("I", tag, message)
+    }
+
+    fun w(tag: String, message: String) {
+        Log.w(tag, message)
+        writeLog("W", tag, message)
+    }
+
+    fun e(tag: String, message: String) {
+        Log.e(tag, message)
+        writeLog("E", tag, message)
+    }
+
+    private fun writeLog(level: String, tag: String, message: String) {
+        val dir = baseDir ?: return
+        executor.execute {
+            try {
+                val today = dateFormat.format(Date())
+                val logFile = File(File(dir, "logs"), "$today.log")
+                logFile.parentFile?.mkdirs()
+                val timestamp = timestampFormat.format(Date())
+                val line = "$timestamp $level/$tag: $message\n"
+                logFile.appendText(line)
+            } catch (_: Exception) {
+                // Silently fail — logging should never crash the app
+            }
+        }
+    }
+
+    private fun rotateLogs() {
+        val dir = baseDir ?: return
+        val logDir = File(dir, "logs")
+        if (!logDir.exists()) return
+
+        val cutoff = System.currentTimeMillis() - MAX_DAYS * 24L * 60 * 60 * 1000
+        logDir.listFiles()
+            ?.filter { it.name.endsWith(".log") }
+            ?.forEach { file ->
+                if (file.lastModified() < cutoff) {
+                    file.delete()
+                }
+            }
+    }
+
+    /** Get all log files sorted by name (date ascending). */
+    fun getLogFiles(): List<File> {
+        val dir = baseDir ?: return emptyList()
+        val logDir = File(dir, "logs")
+        return logDir.listFiles()
+            ?.filter { it.name.endsWith(".log") }
+            ?.sortedBy { it.name }
+            ?: emptyList()
+    }
+}

app/src/main/java/com/example/androidbackupgui/backup/MissingAlgoProvider.kt

@@ -0,0 +1,160 @@
+package com.example.androidbackupgui.backup
+
+import android.util.Log
+import org.bouncycastle.crypto.digests.MD4Digest
+import org.bouncycastle.crypto.engines.AESEngine
+import org.bouncycastle.crypto.macs.CMac
+import org.bouncycastle.crypto.params.KeyParameter
+import java.security.MessageDigest
+import java.security.MessageDigestSpi
+import java.security.Provider
+import java.security.Security
+import java.security.spec.AlgorithmParameterSpec
+import javax.crypto.MacSpi
+
+/**
+ * Injects missing algorithms (MD4, AESCMAC) into Android's BC provider
+ * for jcifs-ng SMB support.
+ *
+ * jcifs-ng instantiates [BouncyCastleProvider] and requests algorithms
+ * ([MessageDigest]"MD4", [Mac]"AESCMAC") that Android's built-in BC
+ * has removed. The BouncyCastleProvider class is shadowed by the boot
+ * classloader, so we patch `jcifs.util.Crypto.provider` via reflection.
+ */
+object MissingAlgoProvider {
+
+    private const val TAG = "MissingAlgoProvider"
+    private val registered = java.util.concurrent.atomic.AtomicBoolean(false)
+
+    private val patchProvider: Provider by lazy {
+        val bc = Security.getProvider("BC")
+        DelegatingBcProvider(bc)
+    }
+
+    fun register() {
+        if (!registered.compareAndSet(false, true)) return
+        try {
+            // 1. Replace cached provider in jcifs-ng classes
+            for (cn in listOf(
+                "jcifs.util.Crypto",
+                "jcifs.smb.NtlmUtil",
+                "jcifs.smb.NtlmPasswordAuthenticator",
+                "jcifs.ntlmssp.Type3Message",
+                "jcifs.smb.NtlmContext"
+            )) setProviderField(cn)
+
+            // 2. Verify
+            try {
+                val cl = Class.forName("jcifs.util.Crypto")
+                val getProv = cl.getDeclaredMethod("getProvider")
+                getProv.isAccessible = true
+                val actual = getProv.invoke(null) as Provider
+                Log.i(TAG, "Crypto.getProvider() => ${actual::class.java.simpleName} " +
+                    "(hasMD4=${actual.getService("MessageDigest", "MD4") != null}, " +
+                    "hasAESCMAC=${actual.getService("Mac", "AESCMAC") != null})")
+            } catch (ve: Exception) {
+                Log.w(TAG, "Verification failed after injection", ve)
+            }
+            
+            // 3. Fallback: register a global provider that wraps BC + MD4 + AESCMAC
+            try {
+                Security.insertProviderAt(GlobalPatchProvider(), 1)
+                Log.i(TAG, "Registered GlobalPatchProvider at position 1")
+            } catch (e: Exception) {
+                Log.w(TAG, "Failed to register global patch provider", e)
+            }
+
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to inject algorithms", e)
+        }
+    }
+
+    private fun setProviderField(clsName: String) {
+        try {
+            val cls = Class.forName(clsName)
+            for (f in cls.declaredFields) {
+                if (java.lang.reflect.Modifier.isStatic(f.modifiers) &&
+                    Provider::class.java.isAssignableFrom(f.type)) {
+                    f.isAccessible = true
+                    f.set(null, patchProvider)
+                    Log.i(TAG, "Set $clsName.${f.name} = DelegatingBcProvider")
+                    return
+                }
+            }
+            Log.i(TAG, "No static Provider field in $clsName")
+        } catch (_: ClassNotFoundException) {
+            Log.i(TAG, "Class not found: $clsName")
+        }
+    }
+
+    // ── MD4 MessageDigestSpi ────────────────────────────────────
+
+    class Md4Spi : MessageDigestSpi() {
+        private val d = MD4Digest()
+        override fun engineGetDigestLength() = d.digestSize
+        override fun engineUpdate(b: Byte) { d.update(b) }
+        override fun engineUpdate(b: ByteArray, o: Int, l: Int) { d.update(b, o, l) }
+        override fun engineDigest(): ByteArray {
+            val r = ByteArray(d.digestSize); d.doFinal(r, 0); return r
+        }
+        override fun engineReset() { d.reset() }
+    }
+
+    // ── AESCMAC MacSpi ─────────────────────────────────────────
+    class AesCmacSpi : MacSpi() {
+        private val mac = CMac(AESEngine.newInstance())
+        override fun engineInit(key: java.security.Key, params: AlgorithmParameterSpec?) {
+            val raw = key.encoded ?: throw java.security.InvalidKeyException("AESCMAC key has no encoded form")
+            mac.init(KeyParameter(raw))
+        }
+        override fun engineUpdate(inp: Byte) { mac.update(inp) }
+        override fun engineUpdate(inp: ByteArray, o: Int, l: Int) { mac.update(inp, o, l) }
+        override fun engineDoFinal(): ByteArray {
+            val r = ByteArray(mac.macSize); mac.doFinal(r, 0); return r
+        }
+        override fun engineGetMacLength() = mac.macSize
+        override fun engineReset() { mac.reset() }
+    }
+
+    // ── Delegating provider ─────────────────────────────────────
+
+    /** A "BC"-named provider that delegates to [bc] except for patched algorithms. */
+    private class DelegatingBcProvider(
+        private val bc: Provider?
+    ) : Provider("BC", bc?.version ?: 1.0, "BC + patches") {
+
+        init {
+            putService(Service(this, "MessageDigest", "MD4",
+                Md4Spi::class.java.name, null, null))
+            putService(Service(this, "Mac", "AESCMAC",
+                AesCmacSpi::class.java.name, null, null))
+        }
+
+        override fun getService(type: String, algorithm: String): Service? {
+            if (type == "MessageDigest" && algorithm.equals("MD4", ignoreCase = true)) return super.getService(type, algorithm)
+            if (type == "Mac" && algorithm.equals("AESCMAC", ignoreCase = true)) return super.getService(type, algorithm)
+            return bc?.getService(type, algorithm)
+        }
+
+        override fun getServices(): MutableSet<Service> {
+            val s = (bc?.getServices() ?: emptySet<Service>()).toMutableSet()
+            s.addAll(super.getServices())
+            return s
+        }
+    }
+}
+
+/**
+ * Standalone provider registered globally as fallback so that
+ * [java.security.Security.getProvider]("BC") or any lazy-loaded
+ * BouncyCastleProvider instance can find MD4 and AESCMAC.
+ * Named differently ("MissingAlgoProvider") to avoid conflict with "BC".
+ */
+private class GlobalPatchProvider : Provider(
+    "MissingAlgoProvider", 1.0, "MD4 + AESCMAC fallback"
+) {
+    init {
+        put("MessageDigest.MD4", MissingAlgoProvider.Md4Spi::class.java.name)
+        put("Mac.AESCMAC", MissingAlgoProvider.AesCmacSpi::class.java.name)
+    }
+}

app/src/main/java/com/example/androidbackupgui/backup/PasswordManager.kt

@@ -0,0 +1,99 @@
+package com.example.androidbackupgui.backup
+
+import android.content.Context
+import android.content.SharedPreferences
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKey
+
+/**
+ * 安全密码管理器。
+ *
+ * 使用 Android EncryptedSharedPreferences + AES256 加密存储敏感凭据，
+ * 包括 restic 仓库密码和远端后端密码。
+ *
+ * 构造后应尽早调用 [init] 完成初始化。
+ */
+object PasswordManager {
+
+    private const val PREF_NAME = "secure_credentials"
+    private const val KEY_RESTIC_PASSWORD = "restic_password"
+    private const val KEY_BACKEND_PASSWORD = "backend_password"
+    private const val KEY_BACKEND_PASS = "backend_pass"
+
+    @Volatile
+    private var prefs: SharedPreferences? = null
+
+    /**
+     * 初始化加密存储。需要在应用启动时（Application.onCreate 或
+     * MainActivity.onCreate）尽早调用。
+     */
+    fun init(context: Context) {
+        if (prefs != null) return
+        synchronized(this) {
+            if (prefs != null) return
+            val masterKey = MasterKey.Builder(context)
+                .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
+                .build()
+            prefs = EncryptedSharedPreferences.create(
+                context,
+                PREF_NAME,
+                masterKey,
+                EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+                EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+            )
+        }
+    }
+
+    // ── Restic 仓库密码 ───────────────────────────────
+
+    /** 获取加密存储的 restic 仓库密码。没有设置时返回 null。 */
+    fun getResticPassword(): String? = prefs?.getString(KEY_RESTIC_PASSWORD, null)
+
+    /** 加密保存 restic 仓库密码。传入 null 可清除。 */
+    fun setResticPassword(password: String?) {
+        if (password == null) {
+            prefs?.edit()?.remove(KEY_RESTIC_PASSWORD)?.apply()
+        } else {
+            prefs?.edit()?.putString(KEY_RESTIC_PASSWORD, password)?.apply()
+        }
+    }
+
+    // ── 远端后端密码 ─────────────────────────────────
+
+    /** 获取加密存储的远端后端密码（WebDAV/SMB）。 */
+    fun getBackendPassword(): String? = prefs?.getString(KEY_BACKEND_PASSWORD, null)
+
+    /** 加密保存远端后端密码。 */
+    fun setBackendPassword(password: String?) {
+        if (password == null) {
+            prefs?.edit()?.remove(KEY_BACKEND_PASSWORD)?.apply()
+        } else {
+            prefs?.edit()?.putString(KEY_BACKEND_PASSWORD, password)?.apply()
+        }
+    }
+
+    /** 获取加密存储的远端后端 passphrase（SMB share）。 */
+    fun getBackendPass(): String? = prefs?.getString(KEY_BACKEND_PASS, null)
+
+    /** 加密保存远端后端 passphrase。 */
+    fun setBackendPass(pass: String?) {
+        if (pass == null) {
+            prefs?.edit()?.remove(KEY_BACKEND_PASS)?.apply()
+        } else {
+            prefs?.edit()?.putString(KEY_BACKEND_PASS, pass)?.apply()
+        }
+    }
+
+    // ── 状态检查 ─────────────────────────────────────
+
+    /** 检查密码管理器是否已初始化。 */
+    fun isInitialized(): Boolean = prefs != null
+
+    /** 检查 restic 密码是否已设置。 */
+    fun hasResticPassword(): Boolean = getResticPassword() != null
+
+    /** 清除所有存储的凭据。 */
+    fun clearAll() {
+        prefs?.edit()?.clear()?.apply()
+    }
+}

app/src/main/java/com/example/androidbackupgui/backup/RemoteSyncManager.kt

@@ -1,202 +0,0 @@
-package com.example.androidbackupgui.backup
-
-import android.util.Log
-import kotlinx.coroutines.CancellationException
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
-import kotlinx.coroutines.sync.Mutex
-import kotlinx.coroutines.sync.withLock
-import java.io.File
-
-/**
- * Manages remote transport lifecycle (SMB/WebDAV) and local temp repo sync.
- *
- * For SMB/WebDAV backends, restic runs against a local temp directory;
- * [RemoteTransport] syncs files to/from the remote backend.
- *
- * All sync operations are serialized via [repoSyncMutex] so concurrent
- * operations don't corrupt the local temp repo.
- */
-class RemoteSyncManager {
-
-    private val TAG = "ResticWrapper"
-
-    /** Local temp directory used as restic repo for SMB/WebDAV backends. */
-    @Volatile
-    var tempRepoDir: String = ""
-
-    /** Domain for SMB NTLM authentication. */
-    @Volatile
-    var backendDomain: String = ""
-
-    // ── Transport cache ──────────────────────────────────
-    @Volatile private var transport: RemoteTransport? = null
-    private var transportConfigKey: String = ""
-    private val transportLock = Any()
-
-    /** Serializes access to tempRepoDir so concurrent operations don't corrupt each other. */
-    private val repoSyncMutex = Mutex()
-
-    // ── Transport lifecycle ──────────────────────────────
-
-    private fun ensureTransport(
-        backend: String, url: String, user: String, pass: String, share: String, repoPath: String
-    ): RemoteTransport? = synchronized(transportLock) {
-        val key = "$backend|$url|$user|$pass|$share|$backendDomain|$repoPath"
-        if (key != transportConfigKey || transport == null) {
-            transport?.let { Log.i(TAG, "transport config changed ($transportConfigKey -> $key), recreating") }
-            // Clear local temp repo when backend config changes so
-            // syncFromRemote downloads fresh data from the new backend
-            if (transportConfigKey.isNotEmpty() && tempRepoDir.isNotEmpty()) {
-                val dir = File(tempRepoDir)
-                val deleted = dir.deleteRecursively()
-                Log.i(TAG, "cleared local temp repo: $tempRepoDir (deleted=$deleted)")
-                dir.mkdirs()
-            }
-            transport = RemoteTransport.create(backend, url, user, pass, share, backendDomain)
-            if (transport != null) {
-                transportConfigKey = key
-                Log.i(TAG, "transport created: $backend @ $url repo=$repoPath domain=$backendDomain")
-            } else {
-                Log.e(TAG, "transport creation failed for backend=$backend url=$url")
-            }
-        }
-        return transport
-    }
-
-    // ── Temp dir lifecycle ───────────────────────────────
-
-    /** Clean up local temp repo and cache directories. */
-    private fun cleanupTempDirs() {
-        if (tempRepoDir.isEmpty()) return
-        try {
-            val repoDir = File(tempRepoDir)
-            if (repoDir.exists()) {
-                val deleted = repoDir.deleteRecursively()
-                Log.i(TAG, "cleanupTempDirs: deleted $tempRepoDir ($deleted)")
-            }
-            val cacheDir = File(tempRepoDir.substringBeforeLast("/") + "/restic_cache")
-            if (cacheDir.exists()) {
-                val deleted = cacheDir.deleteRecursively()
-                Log.i(TAG, "cleanupTempDirs: deleted cache $cacheDir ($deleted)")
-            }
-            val tmpDir = File(tempRepoDir.substringBeforeLast("/") + "/restic_tmp")
-            if (tmpDir.exists()) {
-                val deleted = tmpDir.deleteRecursively()
-                Log.i(TAG, "cleanupTempDirs: deleted tmp $tmpDir ($deleted)")
-            }
-        } catch (e: Exception) {
-            Log.w(TAG, "cleanupTempDirs failed: ${e.message}")
-        }
-    }
-
-
-    /** True if [tempRepoDir] already contains an initialized restic repository (has a config file). */
-    private fun isLocalRepoPopulated(): Boolean {
-        if (tempRepoDir.isEmpty()) return false
-        return File(tempRepoDir, "config").isFile
-    }
-
-    // ── Sync engine ──────────────────────────────────────
-
-    /**
-     * Execute [action] with remote repo synced before/after as needed.
-     * For local/rest-server backends, executes [action] directly without sync.
-     * Protected by [repoSyncMutex] so concurrent operations don't corrupt tempRepoDir.
-     *
-     * Cleanup strategy:
-     * - Write ops (needsUpload=true): cleanup only on successful sync to remote.
-     *   On syncToRemote failure the local repo is preserved so the next
-     *   operation can retry — destroying it would lose the just-created snapshot.
-     * - Read-only ops (needsUpload=false): keep local cache for subsequent operations.
-     * - Read-only ops skip download entirely if local repo is already populated.
-     */
-    suspend fun <T> withRemoteSync(
-        backend: String,
-        backendUrl: String,
-        backendUser: String,
-        backendPass: String,
-        backendShare: String,
-        repoPath: String,
-        needsDownload: Boolean,
-        needsUpload: Boolean,
-        onProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-        action: suspend () -> Result<T>
-    ): Result<T> {
-        if (backend != "smb" && backend != "webdav") return action()
-
-        return repoSyncMutex.withLock {
-            var shouldCleanup = false
-            try {
-                val t = ensureTransport(backend, backendUrl, backendUser, backendPass, backendShare, repoPath)
-                    ?: return@withLock Result.failure(Exception("Failed to create transport for backend: $backend"))
-
-                val localDir = File(tempRepoDir)
-
-                val emitProgress: suspend (RemoteTransport.TransferProgress) -> Unit = { p ->
-                    withContext(Dispatchers.Main) { onProgress(p) }
-                }
-
-                // Write ops always download to avoid overwriting remote changes.
-                // Read-only ops skip download if local repo is already present.
-                val actualDownload = needsDownload && (needsUpload || !isLocalRepoPopulated())
-                if (actualDownload) {
-                    Log.i(TAG, "syncFromRemote start: $repoPath -> $tempRepoDir")
-                    val syncResult = RemoteTransport.syncFromRemote(t, localDir, repoPath, emitProgress, onByteProgress)
-                    if (syncResult.isFailure) {
-                        shouldCleanup = true
-                        Log.e(TAG, "syncFromRemote FAILED: ${syncResult.exceptionOrNull()?.message}")
-                        return@withLock Result.failure(
-                            Exception("syncFromRemote failed: ${syncResult.exceptionOrNull()?.message}")
-                        )
-                    }
-                    Log.i(TAG, "syncFromRemote complete")
-                } else if (needsDownload) {
-                    Log.i(TAG, "syncFromRemote skipped: local repo already populated")
-                }
-
-                val result = action()
-
-                if (needsUpload && result.isSuccess) {
-                    Log.i(TAG, "syncToRemote start: $tempRepoDir -> $repoPath")
-                    val uploadResult = RemoteTransport.syncToRemote(t, localDir, repoPath, emitProgress, onByteProgress)
-                    if (uploadResult.isFailure) {
-                        shouldCleanup = false  // PRESERVE local repo — snapshot would be lost
-                        Log.e(TAG, "syncToRemote FAILED: ${uploadResult.exceptionOrNull()?.message} — local repo preserved for retry")
-                        return@withLock Result.failure(
-                            Exception("syncToRemote failed: ${uploadResult.exceptionOrNull()?.message}")
-                        )
-                    }
-                    Log.i(TAG, "syncToRemote complete")
-                    shouldCleanup = true
-                } else if (result.isFailure) {
-                    shouldCleanup = true
-                }
-
-                result
-            } catch (e: CancellationException) {
-                shouldCleanup = true
-                throw e
-            } catch (e: Exception) {
-                shouldCleanup = true
-                Result.failure(e)
-            } finally {
-                if (shouldCleanup) {
-                    Log.i(TAG, "withRemoteSync: cleaning up temp dirs")
-                    cleanupTempDirs()
-                } else {
-                    Log.d(TAG, "withRemoteSync: keeping local repo for subsequent ops")
-                }
-            }
-        }
-    }
-
-    /**
-     * Public safety-net cleanup called by fragment lifecycle.
-     * Waits for any in-progress operation to finish, then deletes temp dirs.
-     */
-    suspend fun cleanup() {
-        repoSyncMutex.withLock { cleanupTempDirs() }
-    }
-}

app/src/main/java/com/example/androidbackupgui/backup/RemoteTransport.kt

@@ -1,14 +1,7 @@
 package com.example.androidbackupgui.backup
 
-import android.util.Log
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.withContext
-import java.io.File
 import kotlinx.serialization.Serializable
 
-/** Thrown by transports when a remote directory genuinely does not exist (HTTP 404). */
-class FileNotFoundException(path: String) : Exception("Directory not found: $path")
 
 /**
  * Unified abstraction for remote file transport (SMB / WebDAV).
@@ -38,67 +31,21 @@ interface RemoteTransport {
         val currentFile: String
     )
 
-    suspend fun upload(localPath: String, remotePath: String, onProgress: suspend (TransferProgress) -> Unit = {}, onByteProgress: suspend (ByteProgress) -> Unit = {}): Result<Unit>
-    suspend fun download(remotePath: String, localPath: String, onProgress: suspend (TransferProgress) -> Unit = {}, onByteProgress: suspend (ByteProgress) -> Unit = {}): Result<Unit>
+    suspend fun upload(localPath: String, remotePath: String, onProgress: suspend (TransferProgress) -> Unit = {}, onByteProgress: suspend (ByteProgress) -> Unit = {}): AppResult<Unit>
+    suspend fun download(remotePath: String, localPath: String, onProgress: suspend (TransferProgress) -> Unit = {}, onByteProgress: suspend (ByteProgress) -> Unit = {}): AppResult<Unit>
 
     /** List entries in a remote directory (files and subdirectories). */
-    suspend fun listFiles(remoteDir: String): Result<List<RemoteFileInfo>>
+    suspend fun listFiles(remoteDir: String): AppResult<List<RemoteFileInfo>>
 
     /** Create a directory and any missing parents on the remote. */
-    suspend fun mkdirs(remotePath: String): Result<Unit>
+    suspend fun mkdirs(remotePath: String): AppResult<Unit>
 
-    suspend fun delete(remotePath: String): Result<Unit>
-    suspend fun exists(remotePath: String): Result<Boolean>
+    suspend fun delete(remotePath: String): AppResult<Unit>
+    suspend fun exists(remotePath: String): AppResult<Boolean>
+    /** Get the size of a remote file in bytes. Returns [AppResult.Failure] if not found. */
+    suspend fun fileSize(remotePath: String): AppResult<Long>
 
     companion object {
-        private const val TAG = "RemoteTransport"
-        private const val MAX_RETRIES = 3
-
-        /**
-         * Returns true if the exception indicates a transient error worth retrying
-         * (network blip, DNS hiccup, server 5xx), false for permanent errors (4xx).
-         */
-        private fun isTransientError(e: Exception): Boolean {
-            val msg = (e.message ?: "") + (e.cause?.message ?: "")
-            // DNS / network-layer failures
-            if (msg.contains("Unable to resolve host", ignoreCase = true)) return true
-            if (msg.contains("No address associated", ignoreCase = true)) return true
-            if (msg.contains("ConnectException", ignoreCase = true)) return true
-            if (msg.contains("SocketTimeoutException", ignoreCase = true)) return true
-            if (msg.contains("timeout", ignoreCase = true)) return true
-            if (msg.contains("Connection refused", ignoreCase = true)) return true
-            if (msg.contains("Network is unreachable", ignoreCase = true)) return true
-            // 5xx server errors (502 Bad Gateway, 503 Service Unavailable, 504 Gateway Timeout)
-            if (Regex("\\b5\\d{2}\\b").containsMatchIn(msg)) return true
-            return false
-        }
-
-        /**
-         * Execute [block] with retries on transient failures.
-         * Uses exponential backoff: 1s, 2s, 4s.
-         */
-        private suspend fun <T> withRetry(
-            tag: String,
-            block: suspend () -> Result<T>
-        ): Result<T> {
-            var lastError: Result<T>? = null
-            for (attempt in 0..MAX_RETRIES) {
-                if (attempt > 0) {
-                    val waitMs = 1000L * (1 shl (attempt - 1)) // 1s, 2s, 4s
-                    Log.w(TAG, "$tag retry $attempt/$MAX_RETRIES after ${waitMs}ms")
-                    delay(waitMs)
-                }
-                val result = block()
-                if (result.isSuccess) return result
-                val err = result.exceptionOrNull()
-                if (err != null && err is Exception && isTransientError(err)) {
-                    lastError = result
-                    continue
-                }
-                return result // permanent error — don't retry
-            }
-            return lastError ?: Result.failure(Exception("$tag: max retries exceeded"))
-        }
 
         fun create(
             backend: String,
@@ -120,248 +67,6 @@ interface RemoteTransport {
                 else -> null
             }
         }
-
-        /**
-         * Download all files from remote [remoteDir] into [localDir] recursively,
-         * skipping files that already exist locally with the same size.
-         * Deletes local files no longer present on the remote.
-         * Returns failure if any download fails.
-         */
-        suspend fun syncFromRemote(
-            transport: RemoteTransport,
-            localDir: File,
-            remoteDir: String,
-            onProgress: suspend (TransferProgress) -> Unit = {},
-            onByteProgress: suspend (ByteProgress) -> Unit = {}
-        ): Result<Unit> = withContext(Dispatchers.IO) {
-            try {
-                localDir.mkdirs()
-                val remoteFiles = listRemoteRecursive(transport, remoteDir)
-                // Root dir not found (404): treat as empty remote — nothing to download.
-                // This is normal for first-time init where the repo doesn't exist yet.
-                if (remoteFiles == null) {
-                    Log.w(TAG, "syncFromRemote: remote dir '$remoteDir' not accessible, treating as empty")
-                    return@withContext Result.success(Unit)
-                }
-                onProgress(TransferProgress("list", 0, remoteFiles.size))
-                val remoteByPath = remoteFiles.associateBy { it.path }
-                val errors = mutableListOf<String>()
-
-                // Download remote files that are new or have different size
-                var transferred = 0
-                var skipped = 0
-                val syncTotal = remoteFiles.size
-                for ((relPath, info) in remoteByPath) {
-                    val localFile = File(localDir, relPath)
-                    if (localFile.isFile && localFile.length() == info.size) {
-                        Log.d(TAG, "syncFromRemote skip (same size): $relPath")
-                        skipped++
-                        continue
-                    }
-                    transferred++
-                    onProgress(TransferProgress("download", transferred, syncTotal, relPath))
-                    localFile.parentFile?.mkdirs()
-                    val fullRemotePath = "$remoteDir/$relPath"
-                    Log.i(TAG, "syncFromRemote downloading: $fullRemotePath (${info.size} bytes)")
-                    val result = withRetry("download($fullRemotePath)") {
-                        transport.download(fullRemotePath, localFile.absolutePath, onProgress, onByteProgress)
-                    }
-                    if (result.isFailure) {
-                        errors.add("$fullRemotePath: ${result.exceptionOrNull()?.message}")
-                    }
-                }
-
-                // If any download failed, abort before deleting local files —
-                // deleting would destroy valid data for an incomplete sync.
-                if (errors.isNotEmpty()) {
-                    return@withContext Result.failure(
-                        Exception("syncFromRemote: ${errors.size} file(s) failed: ${errors.joinToString("; ")}")
-                    )
-                }
-
-                // Delete local files not on remote (e.g. after prune on another client)
-                val localFiles = walkLocalFiles(localDir)
-                val staleLocalPaths = localFiles.keys.filter { it !in remoteByPath }
-                val staleCount = staleLocalPaths.size
-                for ((staleIdx, relPath) in staleLocalPaths.withIndex()) {
-                    onProgress(TransferProgress("delete_stale", staleIdx + 1, staleCount))
-                    val localFile = localFiles[relPath]!!
-                    Log.i(TAG, "syncFromRemote deleting stale local: $relPath")
-                    try { localFile.delete() } catch (_: Exception) {}
-                }
-                onProgress(TransferProgress("complete", transferred, syncTotal, "已传输: $transferred 跳过: $skipped"))
-                Result.success(Unit)
-            } catch (e: Exception) {
-                Result.failure(Exception("syncFromRemote failed: ${e.message}", e))
-            }
-        }
-
-        /**
-         * Upload all files from [localDir] into [remoteDir] recursively,
-         * skipping files that already exist remotely with the same size.
-         * Deletes remote files that no longer exist locally.
-         * Returns failure if any upload fails.
-         */
-        suspend fun syncToRemote(
-            transport: RemoteTransport,
-            localDir: File,
-            remoteDir: String,
-            onProgress: suspend (TransferProgress) -> Unit = {},
-            onByteProgress: suspend (ByteProgress) -> Unit = {}
-        ): Result<Unit> = withContext(Dispatchers.IO) {
-            try {
-                val localFiles = walkLocalFiles(localDir)
-                onProgress(TransferProgress("list", 0, localFiles.size))
-                val remoteResult = listRemoteRecursive(transport, remoteDir)
-                // If the remote dir is not accessible (404 or network error), treat as empty.
-                // Any real upload errors will surface during the actual file uploads below.
-                if (remoteResult == null) {
-                    Log.w(TAG, "syncToRemote: remote dir '$remoteDir' not accessible, treating as empty")
-                }
-                val remoteByPath = (remoteResult ?: emptyList()).associateBy { it.path }
-                val errors = mutableListOf<String>()
-
-                // Collect unique parent directories that need to exist on remote
-                val remoteDirs = mutableSetOf<String>()
-                for (relPath in localFiles.keys) {
-                    val parent = relPath.substringBeforeLast("/", "")
-                    if (parent.isNotEmpty()) remoteDirs.add(parent)
-                }
-
-                // Ensure all remote directories exist
-                for (dir in remoteDirs) {
-                    transport.mkdirs("$remoteDir/$dir")
-                }
-
-                // Upload new or changed local files
-                var uploaded = 0
-                var uploadSkipped = 0
-                val syncTotal = localFiles.size
-                for ((relPath, localFile) in localFiles) {
-                    val remoteInfo = remoteByPath[relPath]
-                    if (remoteInfo != null && remoteInfo.size == localFile.length()) {
-                        Log.d(TAG, "syncToRemote skip (same size): $relPath")
-                        uploadSkipped++
-                        continue
-                    }
-                    uploaded++
-                    onProgress(TransferProgress("upload", uploaded, syncTotal, relPath))
-                    val fullRemotePath = "$remoteDir/$relPath"
-                    Log.i(TAG, "syncToRemote uploading: $fullRemotePath (${localFile.length()} bytes)")
-                    val result = withRetry("upload($fullRemotePath)") {
-                        transport.upload(localFile.absolutePath, fullRemotePath, onProgress, onByteProgress)
-                    }
-                    if (result.isFailure) {
-                        errors.add("$fullRemotePath: ${result.exceptionOrNull()?.message}")
-                    }
-                }
-
-                // If any upload failed, abort before deleting remote files —
-                // deleting during failed sync could lose the only copy on remote.
-                if (errors.isNotEmpty()) {
-                    return@withContext Result.failure(
-                        Exception("syncToRemote: ${errors.size} file(s) failed: ${errors.joinToString("; ")}")
-                    )
-                }
-
-                // Delete remote files no longer present locally
-                val staleRemotePaths = remoteByPath.keys.filter { it !in localFiles }
-                val staleCount = staleRemotePaths.size
-                for ((staleIdx, relPath) in staleRemotePaths.withIndex()) {
-                    onProgress(TransferProgress("delete_stale", staleIdx + 1, staleCount))
-                    Log.i(TAG, "syncToRemote deleting stale: $relPath")
-                    transport.delete("$remoteDir/$relPath")
-                }
-                onProgress(TransferProgress("complete", uploaded, syncTotal, "已传输: $uploaded 跳过: $uploadSkipped"))
-                Result.success(Unit)
-            } catch (e: Exception) {
-                Result.failure(Exception("syncToRemote failed: ${e.message}", e))
-            }
-        }
-
-
-
-
-        private data class FlatFileInfo(val path: String, val size: Long)
-
-        /** Recursively list all files on the remote. Returns null on failure.
-         * Depth-limited to avoid redundant requests on servers that report
-         * files as directories or return self-referencing PROPFIND entries. */
-        private const val MAX_RECURSE_DEPTH = 3
-
-        private suspend fun listRemoteRecursive(
-            transport: RemoteTransport,
-            remoteDir: String
-        ): List<FlatFileInfo>? {
-            val result = mutableListOf<FlatFileInfo>()
-            // Pair of (relativePath, depth)
-            val dirsToVisit = mutableListOf("" to 0)
-
-            while (dirsToVisit.isNotEmpty()) {
-                val (subDir, depth) = dirsToVisit.removeLast()
-                if (depth >= MAX_RECURSE_DEPTH) {
-                    Log.w(TAG, "listRemoteRecursive: max depth $MAX_RECURSE_DEPTH reached at $remoteDir/$subDir")
-                    continue
-                }
-                val fullDir = if (subDir.isEmpty()) remoteDir else "$remoteDir/$subDir"
-                val listResult = withRetry("listFiles($fullDir)") {
-                    transport.listFiles(fullDir)
-                }
-                if (listResult.isFailure) {
-                    val err = listResult.exceptionOrNull()
-                    // 404 on a subdirectory: directory doesn't exist, skip it silently.
-                    // 404 on the root directory: fatal — the remote repo path may be wrong.
-                    if (err is FileNotFoundException) {
-                        if (subDir.isEmpty()) {
-                            Log.e(TAG, "listRemoteRecursive: root dir '$fullDir' returned 404 — repo may not exist or is rate-limited")
-                            return null
-                        }
-                        Log.d(TAG, "listRemoteRecursive: $fullDir -> 404, skipping")
-                        continue
-                    }
-                    Log.e(TAG, "listRemoteRecursive: listFiles FAILED for '$fullDir': ${err?.message}")
-                    return null
-                }
-                val entries = listResult.getOrThrow()
-                val parentName = subDir.substringAfterLast("/", subDir)
-
-                for (entry in entries) {
-                    val relPath = if (subDir.isEmpty()) entry.name else "$subDir/${entry.name}"
-                    if (entry.isDirectory) {
-                        // Skip self-referencing entries where the server returns
-                        // the directory itself as a child (e.g. data/f9/ contains "f9")
-                        if (entry.name == parentName) {
-                            Log.d(TAG, "listRemoteRecursive skip self-ref: $relPath")
-                            continue
-                        }
-                        dirsToVisit.add(relPath to depth + 1)
-                    } else {
-                        result.add(FlatFileInfo(relPath, entry.size))
-                    }
-                }
-            }
-            Log.i(TAG, "listRemoteRecursive: $remoteDir → ${result.size} files in ${result.map { it.path }.toSet().size} paths")
-            return result
-        }
-
-        /** Walk the local directory tree, returning relative-path → File mapping for all files. */
-        private fun walkLocalFiles(localDir: File): Map<String, File> {
-            val result = mutableMapOf<String, File>()
-            val dirsToVisit = mutableListOf(localDir)
-            val basePath = localDir.absolutePath
-
-            while (dirsToVisit.isNotEmpty()) {
-                val dir = dirsToVisit.removeLast()
-                for (file in dir.listFiles() ?: emptyArray()) {
-                    if (file.isDirectory) {
-                        dirsToVisit.add(file)
-                    } else {
-                        val relPath = file.absolutePath.removePrefix("$basePath/")
-                        result[relPath] = file
-                    }
-                }
-            }
-            return result
-        }
     }
 }
+

app/src/main/java/com/example/androidbackupgui/backup/RestBridgeRunner.kt

@@ -0,0 +1,120 @@
+package com.example.androidbackupgui.backup
+
+import android.util.Log
+import java.io.File
+import java.util.UUID
+
+/**
+ * Manages [ResticRestBridge] lifecycle: create, start, stop, clean cache.
+ *
+ * Usage:
+ * bridgeRunner.withBridge(backend, url, user, pass, share, domain, repoPath) { bridgeUrl, authToken ->
+ *     // RESTIC_REPOSITORY = bridgeUrl
+ *     // RESTIC_REST_USERNAME/PASSWORD = authToken (set via buildBridgeEnv)
+ *     restic commands go here
+ * }
+ * // bridge stopped + cache cleaned automatically
+ * ```
+ */
+class RestBridgeRunner {
+
+    private val TAG = "RestBridgeRunner"
+
+    /** Cached transport to reuse SMB sessions across bridge instances. */
+    private var cachedTransport: RemoteTransport? = null
+    private var cachedTransportKey: String? = null
+
+    /**
+     * Start a REST bridge for the given [backend], execute [block] with the
+     * bridge URL, then stop and clean up.
+     *
+     * For [backend] == "local", the bridge is not started and [block] receives
+     * `null`.
+     */
+    suspend fun <T> withBridge(
+        backend: String,
+        backendUrl: String,
+        backendUser: String,
+        backendPass: String,
+        backendShare: String,
+        backendDomain: String,
+        repoPath: String,
+        cacheDir: File,
+        transportFactory: (
+            backend: String,
+            url: String,
+            user: String,
+            pass: String,
+            share: String,
+            domain: String
+        ) -> RemoteTransport? = ::createTransport,
+        block: suspend (bridgeUrl: String, authToken: String) -> T
+    ): T {
+        if (backend == "local") {
+            return block(repoPath, "")
+        }
+
+        val authToken = UUID.randomUUID().toString().replace("-", "").take(32)
+
+        val key = "$backend|$backendUrl|$backendUser|$backendPass|$backendShare|$backendDomain"
+        if (cachedTransportKey != key) {
+            cachedTransport?.let { Log.d(TAG, "discarding stale cached transport") }
+            val t = transportFactory(backend, backendUrl, backendUser, backendPass, backendShare, backendDomain)
+                ?: return block(repoPath, "")
+            cachedTransport = t
+            cachedTransportKey = key
+        }
+        val transport = cachedTransport!!
+
+        val remoteBase = buildRemoteBase(backend, backendUrl, backendShare, repoPath)
+        val bridge = ResticRestBridge(transport, remoteBase, repoPath, cacheDir, authToken)
+
+        try {
+            bridge.start(0)
+            val port = bridge.listeningPort
+            if (port < 0) {
+                throw IllegalStateException("REST bridge failed to bind a port")
+            }
+            val bridgeUrl = "rest:http://127.0.0.1:$port/$repoPath"
+            Log.i(TAG, "REST bridge started on port $port for $remoteBase (auth=${authToken.take(8)}…)")
+            return block(bridgeUrl, authToken)
+        } finally {
+            try {
+                bridge.stop()
+            } catch (_: Exception) {}
+            Log.d(TAG, "REST bridge stopped")
+            val blobs = cacheDir.listFiles { f -> f.name.startsWith("restic_blob_") }
+            if (blobs != null) {
+                for (f in blobs) f.delete()
+            }
+        }
+    }
+
+    /** Build the remote base path for the REST bridge. */
+    private fun buildRemoteBase(
+        backend: String,
+        backendUrl: String,
+        backendShare: String,
+        repoPath: String
+    ): String {
+        return when (backend) {
+            "smb" -> "smb://${backendUrl.trimEnd('/')}/$backendShare/$repoPath"
+            "webdav" -> "${backendUrl.trimEnd('/')}/${repoPath.trimStart('/')}"
+            else -> repoPath
+        }
+    }
+
+    companion object {
+        /** Default transport factory: delegates to [RemoteTransport.create]. */
+        fun createTransport(
+            backend: String,
+            url: String,
+            user: String,
+            pass: String,
+            share: String,
+            domain: String
+        ): RemoteTransport? {
+            return RemoteTransport.create(backend, url, user, pass, share, domain)
+        }
+    }
+}

app/src/main/java/com/example/androidbackupgui/backup/ResticBackup.kt

@@ -1,27 +1,30 @@
 package com.example.androidbackupgui.backup
 
 import android.util.Log
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
+import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.withContext
-import kotlinx.serialization.json.Json
+import java.io.File
 import kotlin.coroutines.coroutineContext
 
-/** Shared Json instance configured for restic's snake_case output via @SerialName. */
-private val resticJson = Json { ignoreUnknownKeys = true }
-
 /**
  * Backup operations: running restic backup and parsing its summary output.
  *
- * Delegates execution to [ResticCommandRunner], [ResticEnvResolver], and
- * [RemoteSyncManager] which are shared across sub-modules.
+ * 使用 [BackendExecutor] 统一处理 local/remote 后端。
  */
 class ResticBackup(
     private val runner: ResticCommandRunner,
     private val envResolver: ResticEnvResolver,
-    private val syncManager: RemoteSyncManager
+    private val bridgeRunner: RestBridgeRunner,
+    private val executor: BackendExecutor = BackendExecutor(),
 ) {
-    private val TAG = "ResticWrapper"
+    private val TAG = "ResticBackup"
+    var cacheDir: String = ""
+    var backendDomain: String = ""
 
     // ── Backup ─────────────────────────────────────────
 
@@ -36,51 +39,69 @@ class ResticBackup(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-        onProgress: suspend (ResticWrapper.ResticProgress) -> Unit = {}
-    ): Result<ResticWrapper.BackupSummary> = withContext(Dispatchers.IO) {
-        val emit: suspend (ResticWrapper.ResticProgress) -> Unit = { p -> withContext(Dispatchers.Main) { onProgress(p) } }
-        syncManager.withRemoteSync(backend, backendUrl, backendUser, backendPass, backendShare, repoPath,
-            needsDownload = true, needsUpload = true,
-            onProgress = onSyncProgress,
-            onByteProgress = onByteSyncProgress,
-        ) {
+        onProgress: suspend (ResticWrapper.ResticProgress) -> Unit = {},
+    ): AppResult<ResticWrapper.BackupSummary> =
+        withContext(Dispatchers.IO) {
+            val emit: suspend (ResticWrapper.ResticProgress) -> Unit = { p -> withContext(Dispatchers.Main) { onProgress(p) } }
+
             val args = mutableListOf("backup", "--json")
             for (path in paths) args.add(path)
-            for (tag in tags) { args.add("--tag"); args.add(tag) }
-            if (hostname != null) { args.add("--host"); args.add(hostname) }
-
-            val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
-            val result = runner.runResticStreaming(env, args) { line ->
-                if (!coroutineContext.isActive) return@runResticStreaming
-                try {
-                    val progress = resticJson.decodeFromString<ResticWrapper.ResticProgress>(line)
-                    if (progress.messageType == "status") emit(progress)
-                } catch (_: Exception) { /* ignore non-JSON lines */ }
+            for (tag in tags) {
+                args.add("--tag")
+                args.add(tag)
             }
+            if (hostname != null) {
+                args.add("--host")
+                args.add(hostname)
+            }
+
+            val result =
+                executor.withBackend(
+                    repoPath = repoPath,
+                    password = password,
+                    cacheDir = cacheDir,
+                    backend = backend,
+                    backendUrl = backendUrl,
+                    backendUser = backendUser,
+                    backendPass = backendPass,
+                    backendShare = backendShare,
+                    backendDomain = backendDomain,
+                    runner = runner,
+                    envResolver = envResolver,
+                    bridgeRunner = bridgeRunner,
+                ) { env ->
+                    runner.runResticStreaming(env, args) { line ->
+                        if (!coroutineContext.isActive) return@runResticStreaming
+                        try {
+                            val progress = resticJson.decodeFromString<ResticWrapper.ResticProgress>(line)
+                            if (progress.messageType == "status") emit(progress)
+                        } catch (e: Exception) {
+                            if (e is CancellationException) throw e
+                        }
+                    }
+                }
 
             if (result.exitCode != 0) {
-                return@withRemoteSync Result.failure(Exception("restic backup failed: ${result.stderr}"))
+                return@withContext err(AppError.Restic("restic backup 失败", result.exitCode, result.stderr))
             }
-
             parseBackupSummary(result.stdout)
         }
-    }
 
     // ── Internal helpers ───────────────────────────────
 
     /** Parse the JSON summary from the end of restic backup output. */
-    private fun parseBackupSummary(stdout: String): Result<ResticWrapper.BackupSummary> {
+    private fun parseBackupSummary(stdout: String): AppResult<ResticWrapper.BackupSummary> {
         val lines = stdout.lines()
         for (i in lines.indices.reversed()) {
             val line = lines[i].trim()
             if (!line.startsWith("{")) continue
             try {
                 val summary = resticJson.decodeFromString<ResticWrapper.BackupSummary>(line)
-                if (summary.messageType == "summary" && summary.snapshotId.isNotEmpty()) return Result.success(summary)
-            } catch (_: Exception) { /* keep looking */ }
+                if (summary.messageType == "summary" && summary.snapshotId.isNotEmpty()) return AppResult.Success(summary)
+            } catch (_: Exception) {
+                // keep looking
+            }
         }
-        return Result.failure(Exception("No summary found in restic output"))
+        return err(AppError.Parse("restic 备份输出未找到摘要信息", "stdout=" + stdout.length))
     }
 }

app/src/main/java/com/example/androidbackupgui/backup/ResticBinary.kt

@@ -33,13 +33,6 @@ object ResticBinary {
         }
     }
 
-    /** Get the temp directory used as local restic repo for remote backends. */
-    fun getTempRepoDir(context: Context): String {
-        val dir = File(context.cacheDir, "restic_remote_repo")
-        dir.mkdirs()
-        Log.d(TAG, "tempRepoDir = ${dir.absolutePath}")
-        return dir.absolutePath
-    }
 
-    fun isReady(): Boolean = false // call prepare() instead
+    fun isReady(): Boolean = cachedBinaryPath != null
 }

app/src/main/java/com/example/androidbackupgui/backup/ResticCommandRunner.kt

@@ -3,10 +3,13 @@ package com.example.androidbackupgui.backup
 import android.util.Log
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.isActive
+import com.example.androidbackupgui.backup.AppError
 import kotlinx.coroutines.withContext
 import java.io.BufferedReader
 import java.io.File
 import kotlin.coroutines.coroutineContext
+import java.io.ByteArrayOutputStream
+import java.io.InputStream
 import kotlinx.serialization.Serializable
 
 /**
@@ -28,10 +31,25 @@ class ResticCommandRunner {
     )
 
     /** Build the full command list to run restic. */
-    fun buildCommandArgs(args: List<String>): List<String> {
-        val cmd = listOf(binaryPath) + args
-        Log.d(TAG, "buildCommandArgs: binaryPath=$binaryPath args=$args → cmd=$cmd")
-        return cmd
+    fun buildCommandArgs(args: List<String>): List<String> =
+        (listOf(binaryPath) + args).also { cmd ->
+            Log.d(TAG, "buildCommandArgs: binaryPath=$binaryPath args=$args -> cmd=$cmd")
+        }
+
+    /** Wait for process to exit with a polling loop (compatible with API 24+). */
+    private fun Process.waitForCompat(deadlineMs: Long = 60_000): Int {
+        val deadline = System.currentTimeMillis() + deadlineMs
+        while (System.currentTimeMillis() < deadline) {
+            try {
+                return exitValue()
+            } catch (_: IllegalThreadStateException) {
+                Thread.sleep(100)
+            }
+        }
+        Log.w(TAG, "process did not exit within ${deadlineMs}ms, destroying")
+        destroy()
+        waitFor()
+        return exitValue()
     }
 
     /** Run restic (non-streaming). */
@@ -39,6 +57,8 @@ class ResticCommandRunner {
         val cmdArgs = buildCommandArgs(args)
         Log.i(TAG, "runRestic cmd=${cmdArgs.joinToString(" ")}")
         Log.d(TAG, "runRestic REPOSITORY=${env["RESTIC_REPOSITORY"]}")
+        // NOTE: Do NOT log RESTIC_PASSWORD or any value derived from it.
+        // RESTIC_REPOSITORY is safe to log (does not contain secrets).
         env["TMPDIR"]?.let { File(it).mkdirs() }
         return try {
             val pb = ProcessBuilder(cmdArgs)
@@ -46,25 +66,29 @@ class ResticCommandRunner {
             pb.redirectErrorStream(false)
             val process = pb.start()
 
-            val stderrText = StringBuilder()
-            val stderrThread = Thread({
+            // Drain stderr on a separate daemon thread to avoid a pipe deadlock:
+            // if stderr's buffer fills while we're still reading stdout, the child
+            // process blocks on writing stderr and we block on reading stdout.
+            var stderrBytes = byteArrayOf()
+            val stderrThread = Thread {
                 try {
-                    process.errorStream.bufferedReader().use { reader ->
-                        var line: String?
-                        while (reader.readLine().also { line = it } != null) {
-                            Log.d(TAG, "restic stderr: $line")
-                            stderrText.appendLine(line)
-                        }
-                    }
-                } catch (_: Exception) {}
-            }, "restic-stderr").apply { isDaemon = true; start() }
+                    stderrBytes = process.errorStream.use { it.readAllBytesCompat() }
+                } catch (_: Exception) {
+                    // stream closed early; leave stderrBytes empty
+                }
+            }.apply { isDaemon = true; start() }
 
             val stdout = process.inputStream.bufferedReader().use(BufferedReader::readText)
-            val exitCode = process.waitFor()
-            stderrThread.join(5000)
+            val exitCode = try {
+                process.waitForCompat()
+            } catch (_: Exception) { -1 }
+            try { stderrThread.join(1_000) } catch (_: InterruptedException) {}
+            val stderrText = stderrBytes.decodeToString()
             Log.i(TAG, "runRestic exitCode=$exitCode stdout_len=${stdout.length}")
-            if (stderrText.isNotEmpty()) Log.w(TAG, "runRestic stderr: ${stderrText}")
-            CommandResult(stdout.trim(), stderrText.toString().trim(), exitCode)
+            if (stderrText.isNotEmpty()) Log.w(TAG, "runRestic stderr: ${stderrText.trim()}")
+            CommandResult(stdout.trim(), stderrText.trim(), exitCode)
+        } catch (e: kotlinx.coroutines.CancellationException) {
+            throw e
         } catch (e: Exception) {
             Log.e(TAG, "runRestic exception", e)
             CommandResult("", e.message ?: "Unknown error", -1)
@@ -94,59 +118,66 @@ class ResticCommandRunner {
             pb.redirectErrorStream(false)
             process = pb.start()
 
+            // Drain stderr on a separate daemon thread to avoid a pipe deadlock:
+            // if stderr's buffer fills while we're still reading stdout, the child
+            // process blocks on writing stderr and we block on reading stdout.
+            var stderrBytes = byteArrayOf()
+            val stderrThread = Thread {
+                try {
+                    stderrBytes = process.errorStream.use { it.readAllBytesCompat() }
+                } catch (_: Exception) {
+                    // stream closed early; leave stderrBytes empty
+                }
+            }.apply { isDaemon = true; start() }
+
             val stdoutText = StringBuilder()
             val reader = process.inputStream.bufferedReader()
-            val stderrReader = process.errorStream.bufferedReader()
-
-            val stderrText = StringBuilder()
-            val stderrThread = Thread({
-                try { stderrReader.use { stderrText.append(it.readText()) } } catch (_: Exception) {}
-            }, "restic-stderr").apply { isDaemon = true; start() }
 
             try {
-                var line: String?
-                while (reader.readLine().also { line = it } != null) {
+                var line = reader.readLine()
+                while (line != null) {
                     if (!coroutineContext.isActive) {
                         process.destroy()
                         break
                     }
-                    val l = line!!
-                    stdoutText.appendLine(l)
-                    onLine(l)
+                    stdoutText.appendLine(line)
+                    onLine(line)
+                    line = reader.readLine()
                 }
             } finally {
                 try { reader.close() } catch (_: Exception) {}
             }
-            stderrThread.join(5000)
+            try { stderrThread.join(1_000) } catch (_: InterruptedException) {}
+            val stderrText = stderrBytes.decodeToString().trim()
             val exitCode = try {
-                // Manual timeout loop (Process.waitFor(timeout,unit) requires API 26+)
-                val deadline = System.currentTimeMillis() + 60_000
-                var exited = false
-                while (System.currentTimeMillis() < deadline && !exited) {
-                    try {
-                        process.exitValue()
-                        exited = true
-                    } catch (_: IllegalThreadStateException) {
-                        Thread.sleep(100)
-                    }
-                }
-                if (exited) {
-                    process.exitValue()
-                } else {
-                    Log.w(TAG, "runResticStreaming: process did not exit within 60s after stdout EOF, destroying")
-                    process.destroy()
-                    process.waitFor()
-                    process.exitValue()
-                }
+                process.waitForCompat()
             } catch (_: Exception) { -1 }
 
             Log.i(TAG, "runResticStreaming exitCode=$exitCode stdout_len=${stdoutText.length}")
             if (stderrText.isNotEmpty()) Log.w(TAG, "runResticStreaming stderr: ${stderrText}")
-            CommandResult(stdoutText.toString().trim(), stderrText.toString().trim(), exitCode)
+            CommandResult(stdoutText.toString().trim(), stderrText.trim(), exitCode)
+        } catch (e: kotlinx.coroutines.CancellationException) {
+            throw e
         } catch (e: Exception) {
             Log.e(TAG, "runResticStreaming exception", e)
             try { process?.destroy() } catch (_: Exception) {}
             CommandResult("", e.message ?: "Unknown error", -1)
         }
     }
+
+}
+
+/**
+ * Compat implementation of InputStream.readAllBytes() for API < 33.
+ * Reads the entire stream into a byte array.
+ */
+internal fun InputStream.readAllBytesCompat(): ByteArray {
+    val buffer = ByteArrayOutputStream()
+    val data = ByteArray(4096)
+    while (true) {
+        val n = read(data)
+        if (n == -1) break
+        buffer.write(data, 0, n)
+    }
+    return buffer.toByteArray()
 }

app/src/main/java/com/example/androidbackupgui/backup/ResticEnvResolver.kt

@@ -4,46 +4,60 @@ package com.example.androidbackupgui.backup
  * Stateless helper for constructing restic environment variables and repo URLs.
  */
 class ResticEnvResolver {
-
-    /** Build environment for restic. For SMB/WebDAV backends, uses local temp dir as repo. */
-    fun buildFullEnv(
-        repoPath: String,
+    /** Build environment for non-local backends using the REST bridge URL. */
+    fun buildBridgeEnv(
         password: String,
-        backend: String = "local",
-        backendUrl: String = "",
-        backendUser: String = "",
-        backendPass: String = "",
-        backendShare: String = "",
-        tempRepoDir: String = ""
+        bridgeUrl: String,
+        cacheDir: String,
+        authToken: String = "",
     ): Map<String, String> {
-        val env = HashMap(System.getenv() ?: emptyMap())
-        env["RESTIC_REPOSITORY"] = if (backend == "smb" || backend == "webdav") {
-            tempRepoDir
-        } else {
-            buildRepoUrl(backend, repoPath, backendUrl)
-        }
+        // 从空白环境开始，不继承系统环境变量（防止敏感信息泄露到子进程）
+        val env = HashMap<String, String>()
+        env["RESTIC_REPOSITORY"] = bridgeUrl
         env["RESTIC_PASSWORD"] = password
-        // Restic needs HOME for its cache on Android (no $HOME by default).
-        // Both local and remote backends use the same cache dir (sibling of tempRepoDir).
-        if (tempRepoDir.isNotEmpty()) {
-            val cacheDir = tempRepoDir.substringBeforeLast("/") + "/restic_cache"
+        if (authToken.isNotEmpty()) {
+            env["RESTIC_REST_USERNAME"] = authToken
+            env["RESTIC_REST_PASSWORD"] = authToken
+        }
+        if (cacheDir.isNotEmpty()) {
             env["HOME"] = cacheDir
             env["XDG_CACHE_HOME"] = cacheDir
-            // Restic needs a writable temp dir for pack files. Android has no /tmp.
-            val tmpDir = tempRepoDir.substringBeforeLast("/") + "/restic_tmp"
+            val tmpDir = "$cacheDir/restic_tmp"
+            env["TMPDIR"] = tmpDir
+        }
+        return env
+    }
+
+    /** Build environment for local repository. */
+    fun buildLocalEnv(
+        repoPath: String,
+        password: String,
+        cacheDir: String,
+    ): Map<String, String> {
+        // 从空白环境开始，不继承系统环境变量
+        val env = HashMap<String, String>()
+        env["RESTIC_REPOSITORY"] = repoPath
+        env["RESTIC_PASSWORD"] = password
+        if (cacheDir.isNotEmpty()) {
+            env["HOME"] = cacheDir
+            env["XDG_CACHE_HOME"] = cacheDir
+            val tmpDir = "$cacheDir/restic_tmp"
             env["TMPDIR"] = tmpDir
         }
         return env
     }
 
     /** Build a display-friendly repository URL for UI. */
-    fun buildRepoUrl(backend: String, repoPath: String, backendUrl: String): String {
-        return when (backend) {
+    fun buildRepoUrl(
+        backend: String,
+        repoPath: String,
+        backendUrl: String,
+    ): String =
+        when (backend) {
             "local" -> repoPath
             "rest-server" -> "rest:${backendUrl.trimEnd('/')}/$repoPath"
             "webdav" -> "${backendUrl.trimEnd('/')}/$repoPath"
             "smb" -> "smb:${backendUrl.trimEnd('/')}/$repoPath"
             else -> repoPath
         }
-    }
 }

app/src/main/java/com/example/androidbackupgui/backup/ResticJson.kt

@@ -0,0 +1,6 @@
+package com.example.androidbackupgui.backup
+
+import kotlinx.serialization.json.Json
+
+/** Shared Json instance configured for restic's snake_case output via @SerialName. */
+internal val resticJson = Json { ignoreUnknownKeys = true }

app/src/main/java/com/example/androidbackupgui/backup/ResticMaintenance.kt

@@ -1,22 +1,69 @@
 package com.example.androidbackupgui.backup
 
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 
 /**
- * Repository maintenance operations: prune, check, stats.
+ * Repository maintenance operations: prune, unlock, check, stats.
  *
  * [prune] requires both download and upload (it removes pack files from the remote).
  * [check] and [stats] are download-only read operations.
+ *
+ * 使用 [BackendExecutor] 统一处理 local/remote 后端。
+ *
  * Delegates execution to [ResticCommandRunner], [ResticEnvResolver], and
- * [RemoteSyncManager] which are shared across sub-modules.
+ * [RestBridgeRunner] which are shared across sub-modules.
  */
 class ResticMaintenance(
     private val runner: ResticCommandRunner,
     private val envResolver: ResticEnvResolver,
-    private val syncManager: RemoteSyncManager
+    private val bridgeRunner: RestBridgeRunner,
+    private val executor: BackendExecutor = BackendExecutor(),
 ) {
-    // ── Prune ──────────────────────────────────────────
+    /** Cache directory for restic env and bridge temp files. Set by [ResticWrapper]. */
+    var cacheDir: String = ""
+
+    /** SMB NTLM domain for remote backend. Set by [ResticWrapper]. */
+    var backendDomain: String = ""
+
+    /** Run a one-shot restic command and map the result. */
+    private suspend fun runCommand(
+        command: String,
+        failMessage: String,
+        repoPath: String,
+        password: String,
+        backend: String,
+        backendUrl: String,
+        backendUser: String,
+        backendPass: String,
+        backendShare: String,
+    ): AppResult<String> =
+        withContext(Dispatchers.IO) {
+            val result =
+                executor.runResticWithBackend(
+                    args = listOf(command),
+                    repoPath = repoPath,
+                    password = password,
+                    cacheDir = cacheDir,
+                    backend = backend,
+                    backendUrl = backendUrl,
+                    backendUser = backendUser,
+                    backendPass = backendPass,
+                    backendShare = backendShare,
+                    backendDomain = backendDomain,
+                    runner = runner,
+                    envResolver = envResolver,
+                    bridgeRunner = bridgeRunner,
+                )
+            if (result.exitCode == 0) {
+                AppResult.Success(result.stdout)
+            } else {
+                err(AppError.Restic(failMessage, result.exitCode, result.stderr))
+            }
+        }
 
     suspend fun prune(
         repoPath: String,
@@ -26,23 +73,39 @@ class ResticMaintenance(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> =
-        withContext(Dispatchers.IO) {
-            syncManager.withRemoteSync(backend, backendUrl, backendUser, backendPass, backendShare, repoPath,
-                needsDownload = true, needsUpload = true,
-                onProgress = onSyncProgress,
-                onByteProgress = onByteSyncProgress,
-            ) {
-                val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
-                val result = runner.runRestic(env, "prune")
-                if (result.exitCode == 0) Result.success(result.stdout)
-                else Result.failure(Exception("restic prune failed: ${result.stderr}"))
-            }
-        }
+    ): AppResult<String> =
+        runCommand(
+            "prune",
+            "restic prune 失败",
+            repoPath,
+            password,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 
-    // ── Check ──────────────────────────────────────────
+    suspend fun unlock(
+        repoPath: String,
+        password: String,
+        backend: String = "local",
+        backendUrl: String = "",
+        backendUser: String = "",
+        backendPass: String = "",
+        backendShare: String = "",
+    ): AppResult<String> =
+        runCommand(
+            "unlock",
+            "restic unlock 失败",
+            repoPath,
+            password,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 
     suspend fun check(
         repoPath: String,
@@ -52,23 +115,18 @@ class ResticMaintenance(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> =
-        withContext(Dispatchers.IO) {
-            syncManager.withRemoteSync(backend, backendUrl, backendUser, backendPass, backendShare, repoPath,
-                needsDownload = true, needsUpload = false,
-                onProgress = onSyncProgress,
-                onByteProgress = onByteSyncProgress,
-            ) {
-                val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
-                val result = runner.runRestic(env, "check")
-                if (result.exitCode == 0) Result.success(result.stdout)
-                else Result.failure(Exception("restic check failed: ${result.stderr}"))
-            }
-        }
-
-    // ── Stats ──────────────────────────────────────────
+    ): AppResult<String> =
+        runCommand(
+            "check",
+            "restic check 失败",
+            repoPath,
+            password,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 
     suspend fun stats(
         repoPath: String,
@@ -78,19 +136,16 @@ class ResticMaintenance(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> =
-        withContext(Dispatchers.IO) {
-            syncManager.withRemoteSync(backend, backendUrl, backendUser, backendPass, backendShare, repoPath,
-                needsDownload = true, needsUpload = false,
-                onProgress = onSyncProgress,
-                onByteProgress = onByteSyncProgress,
-            ) {
-                val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
-                val result = runner.runRestic(env, "stats")
-                if (result.exitCode == 0) Result.success(result.stdout)
-                else Result.failure(Exception("restic stats failed: ${result.stderr}"))
-            }
-        }
+    ): AppResult<String> =
+        runCommand(
+            "stats",
+            "restic stats 失败",
+            repoPath,
+            password,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 }

app/src/main/java/com/example/androidbackupgui/backup/ResticRepoInit.kt

@@ -1,22 +1,37 @@
 package com.example.androidbackupgui.backup
 
 import android.util.Log
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
+import java.io.File
 
 /**
  * Repository lifecycle operations: init and repo URL construction.
  *
  * Delegates execution to [ResticCommandRunner], [ResticEnvResolver], and
- * [RemoteSyncManager] which are shared across sub-modules.
+ * [RestBridgeRunner] which are shared across sub-modules.
+ *
+ * For "local" backends, invokes restic directly against [repoPath].
+ * For remote backends (SMB/WebDAV/rest-server), starts a temporary REST bridge
+ * via [RestBridgeRunner.withBridge] and points restic at the bridge URL.
  */
 class ResticRepoInit(
     private val runner: ResticCommandRunner,
     private val envResolver: ResticEnvResolver,
-    private val syncManager: RemoteSyncManager
+    private val bridgeRunner: RestBridgeRunner,
+    private val executor: BackendExecutor = BackendExecutor(),
 ) {
     private val TAG = "ResticWrapper"
 
+    /** Cache directory for restic env and bridge temp files. Set by ResticWrapper. */
+    var cacheDir: String = ""
+
+    /** NTLM domain for SMB authentication. Set by ResticWrapper. */
+    var backendDomain: String = ""
+
     // ── Repository initialization ──────────────────────
 
     suspend fun init(
@@ -27,42 +42,114 @@ class ResticRepoInit(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<Unit> =
+    ): AppResult<Unit> =
         withContext(Dispatchers.IO) {
-            syncManager.withRemoteSync(backend, backendUrl, backendUser, backendPass, backendShare, repoPath,
-                needsDownload = true, needsUpload = true,
-                onProgress = onSyncProgress,
-                onByteProgress = onByteSyncProgress,
-            ) {
-                val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
-                val result = runner.runRestic(env, "init")
-                // exitCode 0 = brand new repo created, needs upload
-                if (result.exitCode == 0) {
-                    return@withRemoteSync Result.success(Unit)
+            executor.withBackend(
+                repoPath = repoPath,
+                password = password,
+                cacheDir = cacheDir,
+                backend = backend,
+                backendUrl = backendUrl,
+                backendUser = backendUser,
+                backendPass = backendPass,
+                backendShare = backendShare,
+                backendDomain = backendDomain,
+                runner = runner,
+                envResolver = envResolver,
+                bridgeRunner = bridgeRunner,
+            ) { env -> runInit(env) }
+        }
+
+    /** Shared init logic: run restic init, verify on exitCode 1. */
+    private suspend fun runInit(env: Map<String, String>): AppResult<Unit> {
+        val result = runner.runRestic(env, "init")
+        // exitCode 0 = brand new repo created
+        if (result.exitCode == 0) {
+            return AppResult.Success(Unit)
+        }
+        // exitCode 1: check if it's "config already exists" or a real error
+        if (result.exitCode == 1) {
+            if (!isConfigExistsError(result.stderr)) {
+                // Exit code 1 from restic can also mean connection/backend errors (500, timeout, etc.)
+                return err(AppError.Restic("restic init 失败: ${result.stderr.take(300).trim()}", result.exitCode, result.stderr))
+            }
+            var verify = runner.runRestic(env, "snapshots", "--json")
+            if (verify.exitCode == 0) {
+                // Repo is healthy — already initialized with matching password
+                Log.i(TAG, "init: repo already initialized and verified")
+                return AppResult.Success(Unit)
+            }
+            // Lock-related failure → try unlock then retry
+            if (isLockError(verify.stderr)) {
+                Log.w(TAG, "init: stale lock detected, running unlock")
+                runner.runRestic(env, "unlock")
+                verify = runner.runRestic(env, "snapshots", "--json")
+                if (verify.exitCode == 0) {
+                    Log.i(TAG, "init: repo verified after unlock")
+                    return AppResult.Success(Unit)
                 }
-                // exitCode 1 = config already exists; verify the repo is actually usable
-                if (result.exitCode == 1) {
-                    val verify = runner.runRestic(env, "snapshots", "--json")
-                    if (verify.exitCode == 0) {
-                        // Repo is healthy — already initialized with matching password
-                        Log.i(TAG, "init: repo already initialized and verified")
-                        return@withRemoteSync Result.success(Unit)
-                    }
-                    // Config exists but repo is corrupted (wrong password, missing keys, etc.)
-                    return@withRemoteSync Result.failure(
-                        Exception("仓库已存在但无法验证: ${verify.stderr.ifEmpty { "密码错误或密钥缺失" }}。请删除远端仓库后重试。")
-                    )
-                }
-                Result.failure(Exception("restic init failed: ${result.stderr}"))
+            }
+            // Config exists but verification failed — diagnose the cause
+            val detail = diagnoseInitFailure(verify.stderr)
+            return err(
+                AppError.Restic("仓库已存在但无法验证: $detail", verify.exitCode, verify.stderr),
+            )
+        }
+        return err(AppError.Restic("restic init 失败", result.exitCode, result.stderr))
+    }
+
+    /** Check if [restic init]'s stderr indicates config already exists (vs a real error). */
+    private fun isConfigExistsError(stderr: String): Boolean {
+        val lower = stderr.lowercase()
+        return lower.contains("already exists") ||
+            lower.contains("config file already exists")
+    }
+
+    /** Check if stderr indicates a stale repository lock. */
+    private fun isLockError(stderr: String): Boolean {
+        val lower = stderr.lowercase()
+        return lower.contains("lock") ||
+            lower.contains("unable to create") ||
+            lower.contains("already locked")
+    }
+
+    /** Parse restic stderr to produce a user-facing diagnosis string. */
+    private fun diagnoseInitFailure(stderr: String): String {
+        val lower = stderr.lowercase()
+        return when {
+            lower.contains("wrong password") ||
+                lower.contains("password is incorrect") ||
+                lower.contains("unable to decrypt") ||
+                lower.contains("wrong key") ||
+                lower.contains("invalid password") ||
+                lower.contains("decryption") -> {
+                "密码不正确，请确认仓库密码"
+            }
+
+            lower.contains("key") && (lower.contains("not found") || lower.contains("missing")) -> {
+                "密钥文件缺失，仓库可能已损坏"
+            }
+
+            lower.contains("permission") || lower.contains("access denied") -> {
+                "权限不足，请检查目录权限"
+            }
+
+            lower.contains("not a directory") || lower.contains("no such file") -> {
+                "仓库路径无效或不可访问"
+            }
+
+            else -> {
+                "仓库可能已损坏或密码不正确（${stderr.take(200).trim()}）"
             }
         }
+    }
 
     // ── Public URL helper ──────────────────────────────
 
     /** Build a display-friendly repository URL for UI. */
-    fun buildRepoUrl(backend: String, repoPath: String, backendUrl: String): String {
-        return envResolver.buildRepoUrl(backend, repoPath, backendUrl)
-    }
+    fun buildRepoUrl(
+        backend: String,
+        repoPath: String,
+        backendUrl: String,
+    ): String = envResolver.buildRepoUrl(backend, repoPath, backendUrl)
 }

app/src/main/java/com/example/androidbackupgui/backup/ResticRestBridge.kt

@@ -0,0 +1,534 @@
+package com.example.androidbackupgui.backup
+
+import android.util.Base64
+import android.util.Log
+import fi.iki.elonen.NanoHTTPD
+import fi.iki.elonen.NanoHTTPD.IHTTPSession
+import kotlinx.coroutines.runBlocking
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import java.io.ByteArrayInputStream
+import java.io.File
+import java.util.UUID
+
+/**
+ * NanoHTTPD-based REST bridge implementing the restic REST backend API.
+ *
+ * Translates restic HTTP requests into [RemoteTransport] calls so that restic
+ * can read/write blobs directly to SMB/WebDAV without a local staging repo.
+ *
+ * Port is auto-assigned (0); use [listeningPort] after start().
+ *
+ * @param repoPath repository path from the bridge URL (e.g. "backup").
+ *                 Stripped from incoming URIs so that the remoteBase SMB path
+ *                 does not get double-nested with the repo prefix.
+ */
+class ResticRestBridge(
+    private val transport: RemoteTransport,
+    private val remoteBase: String,
+    private val repoPath: String,
+    private val cacheDir: File,
+    private val authToken: String = "",
+) : NanoHTTPD("127.0.0.1", 0) {
+    private val TAG = "ResticRestBridge"
+
+    init {
+        cacheDir.mkdirs()
+    }
+
+    @Suppress("DEPRECATION")
+    override fun serve(session: IHTTPSession): Response {
+        val uri = session.uri
+        val method = session.method
+        val headers = session.headers
+        val params = session.parms
+
+        // Auth check (defense-in-depth — bridge is already bound to 127.0.0.1)
+        if (authToken.isNotEmpty()) {
+            val expected =
+                "Basic " +
+                    Base64.encodeToString(
+                        "$authToken:$authToken".toByteArray(Charsets.UTF_8),
+                        Base64.NO_WRAP,
+                    )
+            val auth = headers["authorization"]
+            if (auth != expected) {
+                Log.w(TAG, "auth failed (got=${auth?.take(20)}..., expected=Basic $authToken)")
+                return newFixedLengthResponse(
+                    Response.Status.UNAUTHORIZED,
+                    "text/plain",
+                    "Unauthorized",
+                )
+            }
+        }
+
+        Log.d(TAG, "$method $uri")
+
+        return try {
+            handleRequest(method, uri, headers, params, session)
+        } catch (e: Exception) {
+            Log.e(TAG, "request failed: $method $uri", e)
+            newFixedLengthResponse(
+                Response.Status.INTERNAL_ERROR,
+                "text/plain",
+                e.message ?: "Internal error",
+            )
+        }
+    }
+
+    private fun handleRequest(
+        method: NanoHTTPD.Method,
+        uri: String,
+        headers: Map<String, String>,
+        params: Map<String, String>,
+        session: IHTTPSession,
+    ): Response {
+        val path = uri.trimEnd('/')
+        // Strip the repoPath prefix (/backup/...) from the URI so that type/name
+        // parsing sees only the restic REST API segment.
+        val stripPrefix = if (repoPath.isNotEmpty()) "/${repoPath.trim('/')}" else ""
+        val strippedPath =
+            if (stripPrefix.isNotEmpty() && path.startsWith(stripPrefix)) {
+                path.removePrefix(stripPrefix).ifEmpty { "/" }
+            } else {
+                path
+            }
+
+        // POST {path}?create=true -> mkdirs
+        if (method == NanoHTTPD.Method.POST && params["create"] == "true") {
+            return runBlocking {
+                when (transport.mkdirs(remoteBase)) {
+                    is AppResult.Success -> {
+                        newFixedLengthResponse(
+                            Response.Status.OK,
+                            "text/plain",
+                            "",
+                        )
+                    }
+
+                    is AppResult.Failure -> {
+                        newFixedLengthResponse(
+                            Response.Status.INTERNAL_ERROR,
+                            "text/plain",
+                            "mkdirs failed",
+                        )
+                    }
+                }
+            }
+        }
+
+        val segments = strippedPath.split("/").filter { it.isNotEmpty() }
+
+        if (segments.isEmpty()) {
+            return newFixedLengthResponse(Response.Status.NOT_FOUND, "text/plain", "Invalid path")
+        }
+
+        val firstSegment = segments.first()
+
+        // /config endpoints
+        if (firstSegment == "config" && segments.size == 1) {
+            return handleConfig(method, headers, session)
+        }
+
+        // /{type}/ or /{type}/{name}
+        val type = firstSegment
+        val name = if (segments.size >= 2) segments.drop(1).joinToString("/") else null
+
+        if (name == null) {
+            if (method == NanoHTTPD.Method.GET) {
+                return handleListBlobs(type)
+            }
+            return newFixedLengthResponse(Response.Status.METHOD_NOT_ALLOWED, "text/plain", "")
+        }
+
+        return when (method) {
+            NanoHTTPD.Method.HEAD -> handleHeadBlob(type, name)
+            NanoHTTPD.Method.GET -> handleGetBlob(type, name, headers)
+            NanoHTTPD.Method.POST -> handlePostBlob(type, name, session)
+            NanoHTTPD.Method.DELETE -> handleDeleteBlob(type, name)
+            else -> newFixedLengthResponse(Response.Status.METHOD_NOT_ALLOWED, "text/plain", "")
+        }
+    }
+
+    // -- Config endpoints -------------------------------------------
+
+    /**
+     * Stream body from session input to a temp file to avoid OOM on large blobs.
+     * Returns the temp file (caller must delete).
+     */
+    private fun streamBodyToFile(
+        session: IHTTPSession,
+        tmpDir: File,
+    ): Result<File> {
+        val started = System.currentTimeMillis()
+        return try {
+            val tmpFile = File(tmpDir, "restic_blob_${UUID.randomUUID()}")
+            val contentLength = session.headers["content-length"]?.toLongOrNull() ?: -1L
+            val input = (session as NanoHTTPD.HTTPSession).inputStream
+            Log.d(TAG, "streamBodyToFile: reading body (content-length=$contentLength)...")
+            tmpFile.outputStream().use { output ->
+                if (contentLength > 0) {
+                    // Read exactly Content-Length bytes to avoid blocking on keep-alive
+                    val buf = ByteArray(8192)
+                    var remaining = contentLength
+                    while (remaining > 0) {
+                        val toRead = minOf(buf.size.toLong(), remaining).toInt()
+                        val n = input.read(buf, 0, toRead)
+                        if (n == -1) break
+                        output.write(buf, 0, n)
+                        remaining -= n
+                    }
+                    if (remaining > 0) {
+                        Log.w(
+                            TAG,
+                            "streamBodyToFile: body truncated, expected $contentLength bytes but got EOF after ${contentLength - remaining}",
+                        )
+                    }
+                    Unit
+                } else {
+                    input.copyTo(output)
+                }
+            }
+            val elapsed = System.currentTimeMillis() - started
+            val bytes = tmpFile.length()
+            Log.i(TAG, "streamBodyToFile: read $bytes bytes in ${elapsed}ms")
+            Result.success(tmpFile)
+        } catch (e: Exception) {
+            val elapsed = System.currentTimeMillis() - started
+            Log.w(TAG, "streamBodyToFile failed after ${elapsed}ms", e)
+            Result.failure(e)
+        }
+    }
+
+    @Suppress("UNUSED_PARAMETER")
+    private fun handleConfig(
+        method: NanoHTTPD.Method,
+        headers: Map<String, String>,
+        session: IHTTPSession,
+    ): Response =
+        runBlocking {
+            val remotePath = "$remoteBase/config"
+            when (method) {
+                NanoHTTPD.Method.HEAD -> {
+                    var configExists = false
+                    var configSize = 0L
+                    // 先试 exists，失败时回退到 download 确认（某些 SMB 实现 exists 可能假阴性）
+                    when (val exists = transport.exists(remotePath)) {
+                        is AppResult.Success -> {
+                            if (exists.data) {
+                                configExists = true
+                                val sizeResult = transport.fileSize(remotePath)
+                                if (sizeResult is AppResult.Success) configSize = sizeResult.data
+                            }
+                        }
+
+                        is AppResult.Failure -> { /* fall through to download check */ }
+                    }
+                    if (!configExists) {
+                        // Fallback: try downloading the config file to confirm existence
+                        val tmp = File(cacheDir, "restic_blob_${UUID.randomUUID()}")
+                        try {
+                            when (transport.download(remotePath, tmp.absolutePath)) {
+                                is AppResult.Success -> {
+                                    configExists = true
+                                    configSize = tmp.length()
+                                }
+
+                                is AppResult.Failure -> { /* truly not found */ }
+                            }
+                        } finally {
+                            tmp.delete()
+                        }
+                    }
+                    if (configExists) {
+                        newFixedLengthResponse(
+                            Response.Status.OK,
+                            "application/octet-stream",
+                            ByteArrayInputStream(ByteArray(0)),
+                            configSize,
+                        )
+                    } else {
+                        newFixedLengthResponse(Response.Status.NOT_FOUND, "text/plain", "")
+                    }
+                }
+
+                NanoHTTPD.Method.GET -> {
+                    val tempFile = File(cacheDir, "restic_blob_${UUID.randomUUID()}")
+                    try {
+                        when (transport.download(remotePath, tempFile.absolutePath)) {
+                            is AppResult.Success -> {
+                                val data = tempFile.readBytes()
+                                newFixedLengthResponse(
+                                    Response.Status.OK,
+                                    "application/octet-stream",
+                                    data.inputStream(),
+                                    data.size.toLong(),
+                                )
+                            }
+
+                            is AppResult.Failure -> {
+                                newFixedLengthResponse(
+                                    Response.Status.NOT_FOUND,
+                                    "text/plain",
+                                    "",
+                                )
+                            }
+                        }
+                    } finally {
+                        tempFile.delete()
+                    }
+                }
+
+                NanoHTTPD.Method.POST -> {
+                    val tmpResult = streamBodyToFile(session, cacheDir)
+                    if (tmpResult.isFailure) {
+                        return@runBlocking newFixedLengthResponse(
+                            Response.Status.INTERNAL_ERROR,
+                            "text/plain",
+                            "body read failed: ${tmpResult.exceptionOrNull()?.message ?: "unknown"}",
+                        )
+                    }
+                    val tmpFile = tmpResult.getOrThrow()
+                    try {
+                        when (transport.upload(tmpFile.absolutePath, remotePath)) {
+                            is AppResult.Success -> {
+                                newFixedLengthResponse(
+                                    Response.Status.OK,
+                                    "text/plain",
+                                    "",
+                                )
+                            }
+
+                            is AppResult.Failure -> {
+                                newFixedLengthResponse(
+                                    Response.Status.INTERNAL_ERROR,
+                                    "text/plain",
+                                    "upload failed",
+                                )
+                            }
+                        }
+                    } finally {
+                        tmpFile.delete()
+                    }
+                }
+
+                else -> {
+                    newFixedLengthResponse(Response.Status.METHOD_NOT_ALLOWED, "text/plain", "")
+                }
+            }
+        }
+
+    // -- Blob listing -----------------------------------------------
+
+    private fun handleListBlobs(type: String): Response =
+        runBlocking {
+            val remoteDir = "$remoteBase/$type"
+            when (val result = transport.listFiles(remoteDir)) {
+                is AppResult.Success -> {
+                    val items = result.data
+                    val json = buildV2Json(items)
+                    newFixedLengthResponse(Response.Status.OK, "application/vnd.x.restic.rest.v2", json)
+                }
+
+                is AppResult.Failure -> {
+                    newFixedLengthResponse(
+                        Response.Status.NOT_FOUND,
+                        "text/plain",
+                        "",
+                    )
+                }
+            }
+        }
+
+    @Serializable
+    data class BlobEntry(
+        val name: String,
+        val size: Long,
+    )
+
+    private fun buildV2Json(items: List<RemoteTransport.RemoteFileInfo>): String {
+        val blobs = items.filter { !it.isDirectory }.map { BlobEntry(it.name, it.size) }
+        return Json.encodeToString(blobs)
+    }
+
+    // -- Blob HEAD (exists + size) ----------------------------------
+
+    private fun handleHeadBlob(
+        type: String,
+        name: String,
+    ): Response =
+        runBlocking {
+            val remotePath = "$remoteBase/$type/$name"
+            when (val result = transport.exists(remotePath)) {
+                is AppResult.Success -> {
+                    if (result.data) {
+                        newFixedLengthResponse(Response.Status.OK, "application/octet-stream", "")
+                    } else {
+                        newFixedLengthResponse(Response.Status.NOT_FOUND, "text/plain", "")
+                    }
+                }
+
+                is AppResult.Failure -> {
+                    newFixedLengthResponse(
+                        Response.Status.NOT_FOUND,
+                        "text/plain",
+                        "",
+                    )
+                }
+            }
+        }
+
+    // -- Blob GET (download with optional Range) --------------------
+
+    private fun handleGetBlob(
+        type: String,
+        name: String,
+        headers: Map<String, String>,
+    ): Response =
+        runBlocking {
+            val remotePath = "$remoteBase/$type/$name"
+            // Use RandomAccessFile to avoid loading entire blob into memory
+            val tempFile = File(cacheDir, "restic_blob_${UUID.randomUUID()}")
+            try {
+                when (transport.download(remotePath, tempFile.absolutePath)) {
+                    is AppResult.Success -> {
+                        val rangeHeader = headers["range"]?.lowercase()
+
+                        if (rangeHeader != null && rangeHeader.startsWith("bytes=")) {
+                            // Range request — only works with known file size
+                            val fileLen = tempFile.length()
+                            val range = rangeHeader.removePrefix("bytes=").trim()
+                            val dashIdx = range.indexOf('-')
+                            val start =
+                                range
+                                    .substring(0, if (dashIdx >= 0) dashIdx else range.length)
+                                    .toLongOrNull() ?: 0L
+                            val end =
+                                if (dashIdx >= 0 && dashIdx + 1 < range.length) {
+                                    range.substring(dashIdx + 1).toLongOrNull() ?: (fileLen - 1)
+                                } else {
+                                    fileLen - 1
+                                }
+
+                            val actualEnd = minOf(end, fileLen - 1).coerceAtLeast(0)
+                            val actualStart = minOf(start, actualEnd).coerceAtLeast(0)
+                            val chunkSize = (actualEnd - actualStart + 1).toInt()
+                            val chunk = ByteArray(chunkSize)
+                            try {
+                                val raf = java.io.RandomAccessFile(tempFile, "r")
+                                raf.use {
+                                    it.seek(actualStart)
+                                    it.readFully(chunk)
+                                }
+                            } catch (_: Exception) {
+                                return@runBlocking newFixedLengthResponse(
+                                    Response.Status.INTERNAL_ERROR,
+                                    "text/plain",
+                                    "range read failed",
+                                )
+                            }
+
+                            val response =
+                                newChunkedResponse(
+                                    Response.Status.PARTIAL_CONTENT,
+                                    "application/octet-stream",
+                                    chunk.inputStream(),
+                                )
+                            response.addHeader("Content-Range", "bytes $actualStart-$actualEnd/$fileLen")
+                            response.addHeader("Content-Length", chunkSize.toString())
+                            return@runBlocking response
+                        }
+                        // Full file — read into memory (blobs are typically small)
+                        val data = tempFile.readBytes()
+                        val response =
+                            newChunkedResponse(
+                                Response.Status.OK,
+                                "application/octet-stream",
+                                data.inputStream(),
+                            )
+                        response.addHeader("Content-Length", data.size.toString())
+                        response
+                    }
+
+                    is AppResult.Failure -> {
+                        newFixedLengthResponse(
+                            Response.Status.NOT_FOUND,
+                            "text/plain",
+                            "",
+                        )
+                    }
+                }
+            } finally {
+                tempFile.delete()
+            }
+        }
+
+    // -- Blob POST (upload) -----------------------------------------
+
+    private fun handlePostBlob(
+        type: String,
+        name: String,
+        session: IHTTPSession,
+    ): Response =
+        runBlocking {
+            val remotePath = "$remoteBase/$type/$name"
+            val tmpResult = streamBodyToFile(session, cacheDir)
+            if (tmpResult.isFailure) {
+                return@runBlocking newFixedLengthResponse(
+                    Response.Status.INTERNAL_ERROR,
+                    "text/plain",
+                    "body read failed: ${tmpResult.exceptionOrNull()?.message ?: "unknown"}",
+                )
+            }
+            val tmpFile = tmpResult.getOrThrow()
+            try {
+                when (transport.upload(tmpFile.absolutePath, remotePath)) {
+                    is AppResult.Success -> {
+                        newFixedLengthResponse(
+                            Response.Status.OK,
+                            "text/plain",
+                            "",
+                        )
+                    }
+
+                    is AppResult.Failure -> {
+                        newFixedLengthResponse(
+                            Response.Status.INTERNAL_ERROR,
+                            "text/plain",
+                            "upload failed",
+                        )
+                    }
+                }
+            } finally {
+                tmpFile.delete()
+            }
+        }
+
+    // -- Blob DELETE ------------------------------------------------
+
+    private fun handleDeleteBlob(
+        type: String,
+        name: String,
+    ): Response =
+        runBlocking {
+            val remotePath = "$remoteBase/$type/$name"
+            when (transport.delete(remotePath)) {
+                is AppResult.Success -> {
+                    newFixedLengthResponse(
+                        Response.Status.OK,
+                        "text/plain",
+                        "",
+                    )
+                }
+
+                is AppResult.Failure -> {
+                    newFixedLengthResponse(
+                        Response.Status.INTERNAL_ERROR,
+                        "text/plain",
+                        "delete failed",
+                    )
+                }
+            }
+        }
+}

app/src/main/java/com/example/androidbackupgui/backup/ResticRestore.kt

@@ -1,27 +1,29 @@
 package com.example.androidbackupgui.backup
 
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
+import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.withContext
 import java.io.File
-import kotlinx.serialization.json.Json
 import kotlin.coroutines.coroutineContext
 
-/** Shared Json instance configured for restic's snake_case output via @SerialName. */
-private val resticJson = Json { ignoreUnknownKeys = true }
-
 /**
  * Restore operations: full directory restore and single-file dump.
  *
- * Both are download-only operations (no upload to remote needed).
- * Delegates execution to [ResticCommandRunner], [ResticEnvResolver], and
- * [RemoteSyncManager] which are shared across sub-modules.
+ * 使用 [BackendExecutor] 统一处理 local/remote 后端。
  */
 class ResticRestore(
     private val runner: ResticCommandRunner,
     private val envResolver: ResticEnvResolver,
-    private val syncManager: RemoteSyncManager
+    private val bridgeRunner: RestBridgeRunner,
+    private val executor: BackendExecutor = BackendExecutor(),
 ) {
+    var cacheDir: String = ""
+    var backendDomain: String = ""
+
     // ── Restore ────────────────────────────────────────
 
     suspend fun restore(
@@ -35,42 +37,60 @@ class ResticRestore(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-        onProgress: suspend (String) -> Unit = {}
-    ): Result<Unit> = withContext(Dispatchers.IO) {
-        val emit: suspend (String) -> Unit = { s -> withContext(Dispatchers.Main) { onProgress(s) } }
-        syncManager.withRemoteSync(backend, backendUrl, backendUser, backendPass, backendShare, repoPath,
-            needsDownload = true, needsUpload = false,
-            onProgress = onSyncProgress,
-            onByteProgress = onByteSyncProgress,
-        ) {
+        onProgress: suspend (String) -> Unit = {},
+    ): AppResult<Unit> =
+        withContext(Dispatchers.IO) {
+            val emit: suspend (String) -> Unit = { s -> withContext(Dispatchers.Main) { onProgress(s) } }
             File(targetPath).mkdirs()
 
             val args = mutableListOf("restore", snapshotId, "--target", targetPath, "--json")
-            if (include != null) { args.add("--include"); args.add(include) }
-
-            val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
-            val result = runner.runResticStreaming(env, args) { line ->
-                if (!coroutineContext.isActive) return@runResticStreaming
-                try {
-                    val progress = resticJson.decodeFromString<ResticWrapper.ResticProgress>(line)
-                    when (progress.messageType) {
-                        "status" -> {
-                            val percent = "%.1f".format(progress.percentDone * 100)
-                            emit("恢复进度: $percent%")
-                        }
-                        "summary" -> {
-                            emit("恢复完成: ${progress.totalFiles} 个文件")
-                        }
-                    }
-                } catch (_: Exception) { emit(line) }
+            if (include != null) {
+                args.add("--include")
+                args.add(include)
             }
 
-            if (result.exitCode == 0) Result.success(Unit)
-            else Result.failure(Exception("restic restore failed: ${result.stderr}"))
+            val result =
+                executor.withBackend(
+                    repoPath = repoPath,
+                    password = password,
+                    cacheDir = cacheDir,
+                    backend = backend,
+                    backendUrl = backendUrl,
+                    backendUser = backendUser,
+                    backendPass = backendPass,
+                    backendShare = backendShare,
+                    backendDomain = backendDomain,
+                    runner = runner,
+                    envResolver = envResolver,
+                    bridgeRunner = bridgeRunner,
+                ) { env ->
+                    runner.runResticStreaming(env, args) { line ->
+                        if (!coroutineContext.isActive) return@runResticStreaming
+                        try {
+                            val progress = resticJson.decodeFromString<ResticWrapper.ResticProgress>(line)
+                            when (progress.messageType) {
+                                "status" -> {
+                                    val percent = "%.1f".format(progress.percentDone * 100)
+                                    emit("恢复进度: $percent%")
+                                }
+
+                                "summary" -> {
+                                    emit("恢复完成: ${progress.totalFiles} 个文件")
+                                }
+                            }
+                        } catch (e: Exception) {
+                            if (e is CancellationException) throw e
+                            emit(line)
+                        }
+                    }
+                }
+
+            if (result.exitCode == 0) {
+                AppResult.Success(Unit)
+            } else {
+                err(AppError.Restic("restic restore 失败", result.exitCode, result.stderr))
+            }
         }
-    }
 
     // ── File dump ──────────────────────────────────────
 
@@ -84,18 +104,28 @@ class ResticRestore(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = withContext(Dispatchers.IO) {
-        syncManager.withRemoteSync(backend, backendUrl, backendUser, backendPass, backendShare, repoPath,
-            needsDownload = true, needsUpload = false,
-            onProgress = onSyncProgress,
-            onByteProgress = onByteSyncProgress,
-        ) {
-            val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
-            val result = runner.runRestic(env, "dump", snapshotId, filePath)
-            if (result.exitCode == 0) Result.success(result.stdout)
-            else Result.failure(Exception(result.stderr.ifEmpty { "restic dump failed with exit code ${result.exitCode}" }))
+    ): AppResult<String> =
+        withContext(Dispatchers.IO) {
+            val result =
+                executor.withBackend(
+                    repoPath = repoPath,
+                    password = password,
+                    cacheDir = cacheDir,
+                    backend = backend,
+                    backendUrl = backendUrl,
+                    backendUser = backendUser,
+                    backendPass = backendPass,
+                    backendShare = backendShare,
+                    backendDomain = backendDomain,
+                    runner = runner,
+                    envResolver = envResolver,
+                    bridgeRunner = bridgeRunner,
+                ) { env -> runner.runRestic(env, "dump", snapshotId, filePath) }
+
+            if (result.exitCode == 0) {
+                AppResult.Success(result.stdout)
+            } else {
+                err(AppError.Restic(result.stderr.ifEmpty { "restic dump 失败" }, result.exitCode, result.stderr))
+            }
         }
-    }
 }

app/src/main/java/com/example/androidbackupgui/backup/ResticSnapshotOps.kt

@@ -1,25 +1,27 @@
 package com.example.androidbackupgui.backup
 
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
-import kotlinx.serialization.json.Json
 
-
-/** Shared Json instance configured for restic's snake_case output via @SerialName. */
-private val resticJson = Json { ignoreUnknownKeys = true }
 /**
  * Snapshot listing and retention policy operations.
  *
- * [listSnapshots] is download-only; [forget] requires both download and upload
- * (forget removes snapshots from the remote).
- * Delegates execution to [ResticCommandRunner], [ResticEnvResolver], and
- * [RemoteSyncManager] which are shared across sub-modules.
+ * [listSnapshots] is download-only; [forget] removes snapshots from the remote.
+ *
+ * 使用 [BackendExecutor] 统一处理 local/remote 后端。
  */
 class ResticSnapshotOps(
     private val runner: ResticCommandRunner,
     private val envResolver: ResticEnvResolver,
-    private val syncManager: RemoteSyncManager
+    private val bridgeRunner: RestBridgeRunner,
+    private val executor: BackendExecutor = BackendExecutor(),
 ) {
+    var cacheDir: String = ""
+    var backendDomain: String = ""
+
     // ── List snapshots ─────────────────────────────────
 
     suspend fun listSnapshots(
@@ -31,34 +33,44 @@ class ResticSnapshotOps(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<List<ResticWrapper.ResticSnapshot>> = withContext(Dispatchers.IO) {
-        syncManager.withRemoteSync(backend, backendUrl, backendUser, backendPass, backendShare, repoPath,
-            needsDownload = true, needsUpload = false,
-            onProgress = onSyncProgress,
-            onByteProgress = onByteSyncProgress,
-        ) {
+    ): AppResult<List<ResticWrapper.ResticSnapshot>> =
+        withContext(Dispatchers.IO) {
             val args = mutableListOf("snapshots", "--json")
-            if (tag != null) { args.add("--tag"); args.add(tag) }
+            if (tag != null) {
+                args.add("--tag")
+                args.add(tag)
+            }
 
-            val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
-            val result = runner.runRestic(env, args)
+            val result =
+                executor.withBackend(
+                    repoPath = repoPath,
+                    password = password,
+                    cacheDir = cacheDir,
+                    backend = backend,
+                    backendUrl = backendUrl,
+                    backendUser = backendUser,
+                    backendPass = backendPass,
+                    backendShare = backendShare,
+                    backendDomain = backendDomain,
+                    runner = runner,
+                    envResolver = envResolver,
+                    bridgeRunner = bridgeRunner,
+                ) { env -> runner.runRestic(env, args) }
 
             if (result.exitCode != 0) {
-                return@withRemoteSync Result.failure(Exception("restic snapshots failed: ${result.stderr}"))
+                return@withContext err(AppError.Restic("restic snapshots 失败", result.exitCode, result.stderr))
             }
 
             try {
-                val snapshots = resticJson.decodeFromString<List<ResticWrapper.ResticSnapshot>>(
-                    result.stdout.ifEmpty { "[]" }
-                )
-                Result.success(snapshots.sortedByDescending { it.time })
+                val snapshots =
+                    resticJson.decodeFromString<List<ResticWrapper.ResticSnapshot>>(
+                        result.stdout.ifEmpty { "[]" },
+                    )
+                AppResult.Success(snapshots.sortedByDescending { it.time })
             } catch (e: Exception) {
-                Result.failure(Exception("Failed to parse snapshot JSON: ${e.message}"))
+                err(AppError.Parse("解析快照 JSON 失败", e.message ?: ""))
             }
         }
-    }
 
     // ── Forget (retention policy) ──────────────────────
 
@@ -74,27 +86,40 @@ class ResticSnapshotOps(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = withContext(Dispatchers.IO) {
-        syncManager.withRemoteSync(backend, backendUrl, backendUser, backendPass, backendShare, repoPath,
-            needsDownload = true, needsUpload = true,
-            onProgress = onSyncProgress,
-            onByteProgress = onByteSyncProgress,
-        ) {
-            val args = mutableListOf(
-                "forget",
-                "--keep-daily", keepDaily.toString(),
-                "--keep-weekly", keepWeekly.toString(),
-                "--keep-monthly", keepMonthly.toString()
-            )
+    ): AppResult<String> =
+        withContext(Dispatchers.IO) {
+            val args =
+                mutableListOf(
+                    "forget",
+                    "--keep-daily",
+                    keepDaily.toString(),
+                    "--keep-weekly",
+                    keepWeekly.toString(),
+                    "--keep-monthly",
+                    keepMonthly.toString(),
+                )
             if (dryRun) args.add("--dry-run")
 
-            val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
-            val result = runner.runRestic(env, args)
+            val result =
+                executor.withBackend(
+                    repoPath = repoPath,
+                    password = password,
+                    cacheDir = cacheDir,
+                    backend = backend,
+                    backendUrl = backendUrl,
+                    backendUser = backendUser,
+                    backendPass = backendPass,
+                    backendShare = backendShare,
+                    backendDomain = backendDomain,
+                    runner = runner,
+                    envResolver = envResolver,
+                    bridgeRunner = bridgeRunner,
+                ) { env -> runner.runRestic(env, args) }
 
-            if (result.exitCode == 0) Result.success(result.stdout)
-            else Result.failure(Exception("restic forget failed: ${result.stderr}"))
+            if (result.exitCode == 0) {
+                AppResult.Success(result.stdout)
+            } else {
+                err(AppError.Restic("restic forget 失败", result.exitCode, result.stderr))
+            }
         }
-    }
 }

app/src/main/java/com/example/androidbackupgui/backup/ResticStreamBackup.kt

@@ -0,0 +1,285 @@
+package com.example.androidbackupgui.backup
+
+import android.util.Log
+import com.example.androidbackupgui.root.RootShell
+import com.example.androidbackupgui.root.shellEscape
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.withContext
+import java.io.File
+import kotlin.coroutines.coroutineContext
+
+/**
+ * "流式"备份——将应用数据 tar 到临时目录，然后由 restic 统一备份。
+ *
+ * 原实现使用 FIFO + `restic backup --stdin`，但由于 RootShell 每次 exec
+ * 会独立打开/关闭 FIFO，导致 restic 在第一次写入后收到 EOF 退出。
+ *
+ * 当前实现改为：
+ * 1. 创建临时工作目录 stream_data/
+ * 2. 将元数据 + APK 文件复制到该目录
+ * 3. 对每个应用，tar 数据到该目录下的独立文件
+ * 4. 运行 restic backup 指向该目录（无 --stdin，无 FIFO）
+ * 5. 备份完成后清理临时目录
+ *
+ * 和普通备份的区别：临时目录会在备份完成后自动删除，不留本地存档。
+ * 仅当 [BackupConfig.useStreaming] 启用时使用。
+ */
+object ResticStreamBackup {
+    private const val TAG = "ResticStreamBackup"
+
+    /** 单个应用跳过备份的数据大小阈值（500MB） */
+    private const val MAX_STREAM_APP_SIZE_BYTES = 500L * 1024 * 1024
+
+    /**
+     * Run a streaming backup.
+     */
+    suspend fun backup(
+        cacheDir: File,
+        ownPackageName: String,
+        apps: List<AppInfo>,
+        noDataBackup: Set<String>,
+        legacyApps: Map<String, ResticWrapper.SnapshotAppInfo>?,
+        userId: String,
+        restic: ResticWrapper,
+        repoPath: String,
+        password: String,
+        tags: List<String>,
+        hostname: String?,
+        backend: String,
+        backendUrl: String,
+        backendUser: String,
+        backendPass: String,
+        backendShare: String,
+        onProgress: suspend (String) -> Unit = {},
+    ): AppResult<ResticWrapper.BackupSummary> =
+        withContext(Dispatchers.IO) {
+            val emit: suspend (String) -> Unit = { msg -> withContext(Dispatchers.Main) { onProgress(msg) } }
+
+            // ── 1. Create temporary work directory ──────
+            val workDir = File(cacheDir, "stream_data")
+            if (workDir.exists()) RootShell.exec("rm -rf '${workDir.absolutePath.shellEscape()}'")
+            workDir.mkdirs()
+            Log.i(TAG, "Work dir created at ${workDir.absolutePath}")
+
+            try {
+                // ── 2. Write metadata ─────────────────────
+                // 文件直接放在 workDir 根下，与普通备份结构一致
+                emit("正在准备元数据…")
+                BackupOperation.writeFileForBackup(
+                    File(workDir, "appList.txt"),
+                    apps.joinToString("\n") { it.packageName.value },
+                )
+                BackupOperation.writeFileForBackup(
+                    File(workDir, "app_details.json"),
+                    BackupOperation.buildAppDetailsJson(apps, legacyApps),
+                )
+                Log.i(TAG, "Metadata written to ${workDir.absolutePath}")
+
+                // ── 3. Backup APK files ───────────────────
+                // 统一使用 per-app 子目录结构，与普通备份和恢复代码兼容
+                emit("正在备份 APK 文件…")
+                var apkCount = 0
+                for (app in apps) {
+                    if (!coroutineContext.isActive) return@withContext err(AppError.Cancelled)
+                    val appDir = File(workDir, app.packageName.value)
+                    appDir.mkdirs()
+                    val paths = AppScanner.getApkPaths(app.packageName.value)
+                    for ((i, apkPath) in paths.withIndex()) {
+                        val destName = if (paths.size > 1) "${app.packageName.value}_split_$i.apk" else "${app.packageName.value}.apk"
+                        val cpOk =
+                            RootShell
+                                .exec(
+                                    "cp '${apkPath.shellEscape()}' '${File(appDir, destName).absolutePath.shellEscape()}' 2>/dev/null",
+                                ).isSuccess
+                        if (cpOk) apkCount++
+                    }
+                }
+                Log.i(TAG, "Backed up $apkCount APK files")
+
+                // ── 4. Backup app data ────────────────────
+                var successCount = 0
+                var failCount = 0
+
+                for ((index, app) in apps.withIndex()) {
+                    if (!coroutineContext.isActive) return@withContext err(AppError.Cancelled)
+
+                    val pkgName = app.packageName.value
+                    if (pkgName in noDataBackup) {
+                        Log.d(TAG, "backup: skipping data for $pkgName (excluded)")
+                        continue
+                    }
+
+                    emit("备份数据: $pkgName (${index + 1}/${apps.size})")
+
+                    // Force-stop app before data backup for consistency
+                    if (pkgName !in listOf("bin.mt.plus", "com.termux", "bin.mt.plus.canary", ownPackageName)) {
+                        RootShell.exec("am force-stop --user $userId '$pkgName' 2>/dev/null")
+                    }
+
+                    // Check data dirs exist
+                    val dirs = mutableListOf<String>()
+                    val dataCheck = RootShell.exec("test -d '/data/data/${pkgName.shellEscape()}' && echo 1 || echo 0")
+                    if (dataCheck.output.trim() == "1") dirs.add("/data/data/$pkgName")
+
+                    val userDeCheck =
+                        RootShell.exec(
+                            "test -d '/data/user_de/${userId.shellEscape()}/${pkgName.shellEscape()}' && echo 1 || echo 0",
+                        )
+                    if (userDeCheck.output.trim() == "1") dirs.add("/data/user_de/$userId/$pkgName")
+
+                    if (dirs.isEmpty()) {
+                        Log.d(TAG, "backup: no data dirs for $pkgName, skipping")
+                        continue
+                    }
+
+                    // Estimate size, skip oversized apps
+                    val dirArgs = dirs.joinToString(" ") { "'${it.shellEscape()}'" }
+                    val preCheck =
+                        RootShell.exec(
+                            "du -sb --exclude='cache' --exclude='code_cache' --exclude='lib' --exclude='no_backup' --exclude='.ota' $dirArgs 2>/dev/null | awk '{s+=\$1} END{print s}'",
+                        )
+                    val estimatedBytes = preCheck.output.trim().toLongOrNull() ?: 0L
+                    if (estimatedBytes > MAX_STREAM_APP_SIZE_BYTES) {
+                        emit("⚠ $pkgName 数据过大 (${estimatedBytes / 1024 / 1024}MB)，跳过")
+                        Log.w(TAG, "backup: $pkgName too large (${estimatedBytes / 1024 / 1024}MB), skipping")
+                        continue
+                    }
+
+                    // Tar app data to per-app subdirectory
+                    val appDir = File(workDir, pkgName)
+                    appDir.mkdirs()
+                    val tarFile = File(appDir, "${pkgName}_data.tar.zst")
+                    // 使用系统 tar + 捆绑的 zstd（从 cacheDir 推导 filesDir）
+                    val filesDir = File(cacheDir.parentFile, "files")
+                    val zstdBin = File(File(filesDir, "bin"), "zstd_bin")
+                    val zstdCmd = if (zstdBin.canExecute()) zstdBin.absolutePath else "zstd"
+                    val tarCmd = "set -o pipefail; tar -cf - $dirArgs --exclude='cache' --exclude='code_cache' --exclude='lib' --exclude='no_backup' --exclude='.ota' 2>/dev/null | $zstdCmd -T0 -o '${tarFile.absolutePath.shellEscape()}'"
+                    RootShell.exec("chmod +x '${zstdBin.absolutePath.shellEscape()}' 2>/dev/null")
+
+                    val result = RootShell.exec(tarCmd)
+                    if (result.isSuccess && tarFile.length() > 0) {
+                        successCount++
+                    } else {
+                        Log.w(TAG, "backup: tar failed for $pkgName exit=${result.exitCode} err='${result.error.take(200)}'")
+                        failCount++
+                    }
+                }
+
+                emit("数据备份完成 (成功 $successCount, 失败 $failCount)，正在上传至 restic…")
+
+                // ── 5. Run restic backup ──────────────────
+                val args = mutableListOf("backup", "--json")
+                args.add(workDir.absolutePath)
+                for (tag in tags) {
+                    args.add("--tag")
+                    args.add(tag)
+                }
+                if (hostname != null) {
+                    args.add("--host")
+                    args.add(hostname)
+                }
+
+                val cmdArgs = restic.runner.buildCommandArgs(args)
+                Log.i(TAG, "Running restic ${cmdArgs.joinToString(" ")}")
+
+                val result =
+                    restic.executor.runResticStreamingWithBackend(
+                        args = args,
+                        repoPath = repoPath,
+                        password = password,
+                        cacheDir = restic.cacheDir,
+                        backend = backend,
+                        backendUrl = backendUrl,
+                        backendUser = backendUser,
+                        backendPass = backendPass,
+                        backendShare = backendShare,
+                        backendDomain = restic.backendDomain,
+                        runner = restic.runner,
+                        envResolver = restic.envResolver,
+                        bridgeRunner = restic.bridgeRunner,
+                        onLine = { line ->
+                            try {
+                                val progress = resticJson.decodeFromString<ResticWrapper.ResticProgress>(line)
+                                if (progress.messageType == "status") {
+                                    val pct = "%.1f".format(progress.percentDone * 100)
+                                    emit(
+                                        "上传进度: $pct% (${progress.filesDone}/${progress.totalFiles} 文件, ${progress.bytesDone / 1024 / 1024}/${progress.totalBytes / 1024 / 1024}MB)",
+                                    )
+                                }
+                            } catch (_: Exception) {
+                                if (line.length < 200) emit(line)
+                            }
+                        },
+                    )
+
+                if (result.exitCode != 0) {
+                    Log.e(TAG, "restic backup failed: exit=${result.exitCode} stderr=${result.stderr.take(500)}")
+                    return@withContext err(AppError.Restic("restic 备份失败", result.exitCode, result.stderr))
+                }
+
+                // ── 6. Parse summary ─────────────────────
+                val summaryLine =
+                    result.stdout.lines().lastOrNull { line ->
+                        line.contains("\"message_type\"") && line.contains("\"summary\"")
+                    }
+                val summary =
+                    if (summaryLine != null) {
+                        try {
+                            resticJson.decodeFromString<ResticWrapper.BackupSummary>(summaryLine)
+                        } catch (e: Exception) {
+                            Log.w(TAG, "Failed to parse summary: ${e.message}")
+                            null
+                        }
+                    } else {
+                        null
+                    }
+
+                if (summary == null) {
+                    return@withContext err(AppError.Parse("restic 未返回摘要信息", ""))
+                }
+
+                // ── 7. Verify snapshot ───────────────────
+                val snapshotId = summary.snapshotId
+                emit("正在验证快照 ${snapshotId.take(8)}…")
+                try {
+                    restic.executor.withBackend(
+                        repoPath = repoPath,
+                        password = password,
+                        cacheDir = restic.cacheDir,
+                        backend = backend,
+                        backendUrl = backendUrl,
+                        backendUser = backendUser,
+                        backendPass = backendPass,
+                        backendShare = backendShare,
+                        backendDomain = restic.backendDomain,
+                        runner = restic.runner,
+                        envResolver = restic.envResolver,
+                        bridgeRunner = restic.bridgeRunner,
+                    ) { env ->
+                        val verifyResult = restic.runner.runRestic(env, "snapshots", "--json")
+                        if (verifyResult.exitCode == 0 && verifyResult.stdout.contains(snapshotId)) {
+                            Log.i(TAG, "backup: snapshot $snapshotId verified")
+                        } else {
+                            Log.w(TAG, "backup: snapshot $snapshotId NOT found in snapshots list!")
+                        }
+                    }
+                } catch (e: Exception) {
+                    Log.w(TAG, "backup: snapshot verification failed: ${e.message}")
+                }
+
+                AppResult.Success(summary)
+            } catch (e: CancellationException) {
+                throw e
+            } catch (e: Exception) {
+                LogUtil.e(TAG, "backup failed: ${e.message}")
+                err(AppError.Restic("流式备份异常: ${e.message}", -1, ""))
+            } finally {
+                // ── 8. Cleanup ───────────────────────────
+                emit("正在清理临时文件…")
+                RootShell.exec("rm -rf '${workDir.absolutePath.shellEscape()}'")
+                Log.i(TAG, "Work dir cleaned up")
+            }
+        }
+}

app/src/main/java/com/example/androidbackupgui/backup/ResticWrapper.kt

@@ -1,13 +1,17 @@
 package com.example.androidbackupgui.backup
 
 import android.util.Log
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.isActive
-import java.io.File
 import kotlinx.coroutines.withContext
-import kotlin.coroutines.coroutineContext
-import kotlinx.serialization.Serializable
 import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import org.json.JSONObject
+import java.io.File
+import kotlin.coroutines.coroutineContext
 
 /**
  * Wraps the restic CLI binary for backup/restore operations.
@@ -15,60 +19,86 @@ import kotlinx.serialization.SerialName
  * Uses environment variables (RESTIC_REPOSITORY, RESTIC_PASSWORD) rather than
  * command-line flags to avoid leaking secrets in the process list.
  *
- * For SMB/WebDAV backends, restic runs against a local temp directory;
- * RemoteTransport syncs files to/from the remote backend.
+ * For SMB/WebDAV backends, restic connects via a local REST bridge
+ * ([ResticRestBridge]) that translates HTTP requests to [RemoteTransport] calls,
+ * eliminating the need for a local staging repo and full-directory sync.
  *
  * All public methods are suspend and run on Dispatchers.IO.
  *
  * This object is a facade that delegates to [ResticCommandRunner],
- * [ResticEnvResolver], [RemoteSyncManager], and sub-module classes
+ * [ResticEnvResolver], [RestBridgeRunner], and sub-module classes
  * ([ResticRepoInit], [ResticBackup], [ResticRestore], [ResticSnapshotOps],
  * [ResticMaintenance]).
  */
-object ResticWrapper {
 
-    private const val TAG = "ResticWrapper"
+/**
+ * 默认 [ResticWrapper] 实例。用于不需要自定义依赖注入的场景。
+ */
+val defaultResticWrapper: ResticWrapper = ResticWrapper()
 
-    private val runner = ResticCommandRunner()
-    private val envResolver = ResticEnvResolver()
-    private val syncManager = RemoteSyncManager()
+/**
+ * Wraps the restic CLI binary for backup/restore operations.
+ *
+ * 现在是一个 class 而非 object，可以通过构造函数注入依赖。
+ * 使用 [defaultResticWrapper] 获取默认单例。
+ */
+class ResticWrapper(
+    internal val runner: ResticCommandRunner = ResticCommandRunner(),
+    internal val envResolver: ResticEnvResolver = ResticEnvResolver(),
+    internal val bridgeRunner: RestBridgeRunner = RestBridgeRunner(),
+    internal val executor: BackendExecutor = BackendExecutor(),
+) {
+    private val TAG = "ResticWrapper"
 
     // ── Sub-module instances ───────────────────────────
 
-    private val repoInit = ResticRepoInit(runner, envResolver, syncManager)
-    private val backupOp = ResticBackup(runner, envResolver, syncManager)
-    private val restoreOp = ResticRestore(runner, envResolver, syncManager)
-    private val snapshotOps = ResticSnapshotOps(runner, envResolver, syncManager)
-    private val maintenance = ResticMaintenance(runner, envResolver, syncManager)
+    private val repoInit = ResticRepoInit(runner, envResolver, bridgeRunner, executor)
+    private val backupOp = ResticBackup(runner, envResolver, bridgeRunner, executor)
+    private val restoreOp = ResticRestore(runner, envResolver, bridgeRunner, executor)
+    private val snapshotOps = ResticSnapshotOps(runner, envResolver, bridgeRunner, executor)
+    private val maintenance = ResticMaintenance(runner, envResolver, bridgeRunner, executor)
 
     // ── Property delegation ───────────────────────────
 
     /** Path to the restic binary. Default assumes it's on PATH (e.g. Termux). */
     var binaryPath: String
         get() = runner.binaryPath
-        set(v) { runner.binaryPath = v }
+        set(v) {
+            runner.binaryPath = v
+        }
 
-    /** Local temp directory used as restic repo for SMB/WebDAV backends. */
-    var tempRepoDir: String
-        get() = syncManager.tempRepoDir
-        set(v) { syncManager.tempRepoDir = v }
-
-    /** Domain for SMB NTLM authentication. */
-    var backendDomain: String
-        get() = syncManager.backendDomain
-        set(v) { syncManager.backendDomain = v }
+    /** Cache directory for restic (XDG_CACHE_HOME) and bridge tmp blobs. */
+    var cacheDir: String = ""
+        set(v) {
+            field = v
+            repoInit.cacheDir = v
+            backupOp.cacheDir = v
+            restoreOp.cacheDir = v
+            snapshotOps.cacheDir = v
+            maintenance.cacheDir = v
+        }
 
+    /** Domain for SMB NTLM authentication. Propagated to sub-modules. */
+    var backendDomain: String = ""
+        set(v) {
+            field = v
+            repoInit.backendDomain = v
+            backupOp.backendDomain = v
+            restoreOp.backendDomain = v
+            snapshotOps.backendDomain = v
+            maintenance.backendDomain = v
+        }
     // ── Progress data ─────────────────────────────────
 
     @Serializable
     data class ResticProgress(
-        @SerialName("message_type") val messageType: String,       // "status" during backup
+        @SerialName("message_type") val messageType: String, // "status" during backup
         @SerialName("percent_done") val percentDone: Double = 0.0,
         @SerialName("total_files") val totalFiles: Int = 0,
         @SerialName("files_done") val filesDone: Int = 0,
         @SerialName("total_bytes") val totalBytes: Long = 0,
         @SerialName("bytes_done") val bytesDone: Long = 0,
-        @SerialName("current_files") val currentFiles: List<String> = emptyList()
+        @SerialName("current_files") val currentFiles: List<String> = emptyList(),
     )
 
     @Serializable
@@ -78,7 +108,14 @@ object ResticWrapper {
         val time: String,
         val paths: List<String>,
         val tags: List<String>,
-        val hostname: String = ""
+        val hostname: String = "",
+    )
+
+    /** App metadata read from a restic snapshot for change detection. */
+    data class SnapshotAppInfo(
+        val label: String,
+        val isSystem: Boolean,
+        val apkSizes: List<Long> = emptyList(),
     )
 
     // ── Repository lifecycle ─────────────────────────
@@ -91,12 +128,16 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<Unit> = repoInit.init(
-        repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
-    )
+    ): AppResult<Unit> =
+        repoInit.init(
+            repoPath,
+            password,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 
     // ── Backup ─────────────────────────────────────────
 
@@ -115,7 +156,7 @@ object ResticWrapper {
         @SerialName("data_added") val dataAdded: Long = 0,
         @SerialName("total_files_processed") val totalFilesProcessed: Int = 0,
         @SerialName("total_bytes_processed") val totalBytesProcessed: Long = 0,
-        @SerialName("total_duration") val totalDuration: Double = 0.0
+        @SerialName("total_duration") val totalDuration: Double = 0.0,
     )
 
     suspend fun backup(
@@ -129,14 +170,62 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-        onProgress: suspend (ResticProgress) -> Unit = {}
-    ): Result<BackupSummary> = backupOp.backup(
-        repoPath, password, paths, tags, hostname,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress, onProgress
-    )
+        onProgress: suspend (ResticProgress) -> Unit = {},
+    ): AppResult<BackupSummary> =
+        backupOp.backup(
+            repoPath,
+            password,
+            paths,
+            tags,
+            hostname,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+            onProgress,
+        )
+
+    /**
+     * Streaming backup: pipes tar data through a FIFO directly into restic --stdin.
+     * Avoids writing a staging tarball to disk. Requires [cacheDir] to be set first.
+     */
+    suspend fun backupStreaming(
+        apps: List<AppInfo>,
+        noDataBackup: Set<String>,
+        legacyApps: Map<String, SnapshotAppInfo>?,
+        userId: String = "0",
+        repoPath: String,
+        password: String,
+        tags: List<String>,
+        hostname: String?,
+        backend: String,
+        backendUrl: String,
+        backendUser: String,
+        backendPass: String,
+        backendShare: String,
+        onProgress: suspend (String) -> Unit = {},
+        ownPackageName: String = "",
+    ): AppResult<BackupSummary> =
+        ResticStreamBackup.backup(
+            cacheDir = File(cacheDir),
+            ownPackageName = ownPackageName,
+            apps = apps,
+            noDataBackup = noDataBackup,
+            legacyApps = legacyApps,
+            userId = userId,
+            restic = this,
+            repoPath = repoPath,
+            password = password,
+            tags = tags,
+            hostname = hostname,
+            backend = backend,
+            backendUrl = backendUrl,
+            backendUser = backendUser,
+            backendPass = backendPass,
+            backendShare = backendShare,
+            onProgress = onProgress,
+        )
 
     // ── Restore ────────────────────────────────────────
 
@@ -151,14 +240,21 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-        onProgress: suspend (String) -> Unit = {}
-    ): Result<Unit> = restoreOp.restore(
-        repoPath, password, snapshotId, targetPath, include,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress, onProgress
-    )
+        onProgress: suspend (String) -> Unit = {},
+    ): AppResult<Unit> =
+        restoreOp.restore(
+            repoPath,
+            password,
+            snapshotId,
+            targetPath,
+            include,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+            onProgress,
+        )
 
     // ── File dump ──────────────────────────────────────
 
@@ -172,13 +268,18 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = restoreOp.dump(
-        repoPath, password, snapshotId, filePath,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
-    )
+    ): AppResult<String> =
+        restoreOp.dump(
+            repoPath,
+            password,
+            snapshotId,
+            filePath,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 
     // ── Snapshot management ────────────────────────────
 
@@ -191,13 +292,17 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<List<ResticSnapshot>> = snapshotOps.listSnapshots(
-        repoPath, password, tag,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
-    )
+    ): AppResult<List<ResticSnapshot>> =
+        snapshotOps.listSnapshots(
+            repoPath,
+            password,
+            tag,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 
     suspend fun forget(
         repoPath: String,
@@ -211,13 +316,117 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = snapshotOps.forget(
-        repoPath, password, keepDaily, keepWeekly, keepMonthly, dryRun,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
-    )
+    ): AppResult<String> =
+        snapshotOps.forget(
+            repoPath,
+            password,
+            keepDaily,
+            keepWeekly,
+            keepMonthly,
+            dryRun,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
+
+    /**
+     * Read [app_details.json] from the latest restic snapshot and return a map
+     * of package-name → [SnapshotAppInfo]. Returns `null` when no snapshots
+     * exist or the file cannot be read (e.g. first backup, legacy format).
+     */
+    suspend fun getLatestSnapshotAppDetails(
+        repoPath: String,
+        password: String,
+        backend: String = "local",
+        backendUrl: String = "",
+        backendUser: String = "",
+        backendPass: String = "",
+        backendShare: String = "",
+    ): Map<String, SnapshotAppInfo>? =
+        withContext(Dispatchers.IO) {
+            val snapsResult =
+                snapshotOps.listSnapshots(
+                    repoPath,
+                    password,
+                    tag = null,
+                    backend,
+                    backendUrl,
+                    backendUser,
+                    backendPass,
+                    backendShare,
+                )
+            val snaps =
+                when (snapsResult) {
+                    is AppResult.Failure -> {
+                        Log.w(TAG, "getLatestSnapshotAppDetails: listSnapshots failed: ${snapsResult.error.message}")
+                        null
+                    }
+
+                    is AppResult.Success -> {
+                        snapsResult.data
+                    }
+                } ?: return@withContext null
+
+            if (snaps.isEmpty()) return@withContext null
+
+            val latestId = snaps.first().shortId
+            val basePath =
+                snaps
+                    .first()
+                    .paths
+                    .firstOrNull()
+                    ?.trimEnd('/') ?: return@withContext null
+
+            val dumpResult =
+                restoreOp.dump(
+                    repoPath,
+                    password,
+                    latestId,
+                    "$basePath/app_details.json",
+                    backend,
+                    backendUrl,
+                    backendUser,
+                    backendPass,
+                    backendShare,
+                )
+
+            val jsonStr =
+                when (dumpResult) {
+                    is AppResult.Failure -> return@withContext null
+                    is AppResult.Success -> dumpResult.data
+                }
+
+            return@withContext parseAppDetailsJson(jsonStr)
+        }
+
+    /** Parse [app_details.json] content into a package-name → [SnapshotAppInfo] map. */
+    internal fun parseAppDetailsJson(jsonStr: String): Map<String, SnapshotAppInfo> {
+        val map = mutableMapOf<String, SnapshotAppInfo>()
+        try {
+            val root = JSONObject(jsonStr)
+            for (key in root.keys()) {
+                val entry = root.optJSONObject(key) ?: continue
+                val sizes = mutableListOf<Long>()
+                val sizesArr = entry.optJSONArray("apkSizes")
+                if (sizesArr != null) {
+                    for (i in 0 until sizesArr.length()) {
+                        sizes.add(sizesArr.optLong(i, 0L))
+                    }
+                }
+                map[key] =
+                    SnapshotAppInfo(
+                        label = entry.optString("label", key),
+                        isSystem = entry.optBoolean("isSystem", false),
+                        apkSizes = sizes,
+                    )
+            }
+        } catch (_: Exception) {
+            Log.w(TAG, "parseAppDetailsJson: failed to parse JSON")
+        }
+        return map
+    }
 
     // ── Maintenance ────────────────────────────────────
 
@@ -229,13 +438,16 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = maintenance.prune(
-        repoPath, password,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
-    )
+    ): AppResult<String> =
+        maintenance.prune(
+            repoPath,
+            password,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 
     suspend fun check(
         repoPath: String,
@@ -245,13 +457,16 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = maintenance.check(
-        repoPath, password,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
-    )
+    ): AppResult<String> =
+        maintenance.check(
+            repoPath,
+            password,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 
     suspend fun stats(
         repoPath: String,
@@ -261,28 +476,42 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = maintenance.stats(
-        repoPath, password,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
-    )
+    ): AppResult<String> =
+        maintenance.stats(
+            repoPath,
+            password,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
+
+    suspend fun unlock(
+        repoPath: String,
+        password: String,
+        backend: String = "local",
+        backendUrl: String = "",
+        backendUser: String = "",
+        backendPass: String = "",
+        backendShare: String = "",
+    ): AppResult<String> =
+        maintenance.unlock(
+            repoPath,
+            password,
+            backend,
+            backendUrl,
+            backendUser,
+            backendPass,
+            backendShare,
+        )
 
     // ── Public URL helper ──────────────────────────────
 
     /** Build a display-friendly repository URL for UI. */
-    fun buildRepoUrl(backend: String, repoPath: String, backendUrl: String): String {
-        return repoInit.buildRepoUrl(backend, repoPath, backendUrl)
-    }
-
-    // ── Lifecycle ──────────────────────────────────────
-
-    /**
-     * Public safety-net cleanup called by fragment lifecycle.
-     * Waits for any in-progress operation to finish, then deletes temp dirs.
-     */
-    suspend fun cleanup() {
-        syncManager.cleanup()
-    }
+    fun buildRepoUrl(
+        backend: String,
+        repoPath: String,
+        backendUrl: String,
+    ): String = repoInit.buildRepoUrl(backend, repoPath, backendUrl)
 }

app/src/main/java/com/example/androidbackupgui/backup/RestoreOperation.kt

@@ -1,24 +1,25 @@
 package com.example.androidbackupgui.backup
+import android.content.Context
+import android.util.Log
 import com.example.androidbackupgui.root.RootShell
 import com.example.androidbackupgui.root.shellEscape
-import android.util.Log
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.isActive
-import kotlinx.coroutines.withContext
-import java.io.File
-import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.supervisorScope
 import kotlinx.coroutines.sync.Semaphore
 import kotlinx.coroutines.sync.withPermit
-import java.util.concurrent.atomic.AtomicInteger
+import kotlinx.coroutines.withContext
 import kotlinx.serialization.Serializable
+import java.io.File
+import java.util.concurrent.atomic.AtomicInteger
 
 /**
  * Performs restore of backed-up apps using root shell.
  * Mirrors the logic from backup_script's modules/restore.sh.
  */
 object RestoreOperation {
-
     private const val TAG = "RestoreOperation"
 
     @Serializable
@@ -26,15 +27,15 @@ object RestoreOperation {
         val current: Int,
         val total: Int,
         val packageName: String,
-        val stage: String,    // "install", "data", "obb", "ssaid", "permissions", "done"
-        val message: String
+        val stage: String, // "install", "data", "obb", "ssaid", "permissions", "done"
+        val message: String,
     )
 
     @Serializable
     data class RestoreResult(
         val successCount: Int,
         val failCount: Int,
-        val elapsedMs: Long
+        val elapsedMs: Long,
     )
 
     /**
@@ -42,161 +43,342 @@ object RestoreOperation {
      * @param filterPkgs if non-null, only restore packages in this set
      */
     suspend fun restoreApps(
+        context: Context,
         backupDir: File,
         userId: String = "0",
         filterPkgs: Set<String>? = null,
-        onProgress: suspend (RestoreProgress) -> Unit = {}
-    ): RestoreResult = withContext(Dispatchers.IO) {
-        val emit: suspend (RestoreProgress) -> Unit = { p -> withContext(Dispatchers.Main) { onProgress(p) } }
-        val startTime = System.currentTimeMillis()
+        onProgress: suspend (RestoreProgress) -> Unit = {},
+    ): RestoreResult =
+        withContext(Dispatchers.IO) {
+            val emit: suspend (RestoreProgress) -> Unit = { p -> withContext(Dispatchers.Main) { onProgress(p) } }
+            val startTime = System.currentTimeMillis()
 
-        // Read app list from backup
-        val appListFile = File(backupDir, "appList.txt")
-        val allPackages = if (appListFile.exists()) {
-            appListFile.readLines()
-                .map { it.trim() }
-                .filter { it.isNotEmpty() && !it.startsWith("#") }
-        } else {
-            // Fallback: scan subdirectories
-            backupDir.listFiles()
-                ?.filter { it.isDirectory && File(it, "${it.name}.apk").exists() }
-                ?.map { it.name }
-                ?: emptyList()
-        }
+            // Resolve bundled binary paths for tar/zstd (backup used them, restore must too)
+            val tarCmd = BinaryResolver.tarPath(context) ?: "tar"
+            val bundledZstd = BinaryResolver.zstdPath(context)
+            val zstdCmd = bundledZstd ?: "zstd"
 
-        val packages = if (filterPkgs != null) {
-            allPackages.filter { it in filterPkgs }
-        } else {
-            allPackages
-        }
+            // Read app list from backup
+            val appListFile = File(backupDir, "appList.txt")
+            val appListContent = BackupOperation.readTextFile(appListFile)
+            LogUtil.i(TAG, "restoreApps: appListContent=${appListContent?.substringBefore("\n")?.take(100)}")
+            val allPackages =
+                appListContent?.let { content ->
+                    content.lines().map { it.trim() }.filter { it.isNotEmpty() && !it.startsWith("#") }
+                } ?: run {
+                    LogUtil.i(TAG, "restoreApps: readTextFile returned null, trying listBackupFiles")
+                    val children = BackupOperation.listBackupFiles(backupDir)
+                    LogUtil.i(TAG, "restoreApps: listBackupFiles returned ${children?.size} children")
+                    children?.filter { name ->
+                        val apkFile = File(File(backupDir, name), "$name.apk")
+                        val exists = BackupOperation.backupPathExists(apkFile)
+                        LogUtil.i(TAG, "restoreApps: child $name apkExists=$exists")
+                        exists
+                    } ?: emptyList()
+                }
 
-        val successAtomic = AtomicInteger(0)
-        val failAtomic = AtomicInteger(0)
+            val packages =
+                if (filterPkgs != null) {
+                    allPackages.filter { it in filterPkgs }
+                } else {
+                    allPackages
+                }
+            LogUtil.i(
+                TAG,
+                "restoreApps: starting restore of ${packages.size} packages (all=${allPackages.size}) from ${backupDir.absolutePath}",
+            )
+            if (packages.isEmpty()) {
+                LogUtil.w(TAG, "restoreApps: packages list is empty, nothing to restore")
+            }
 
-        val semaphore = Semaphore(2)
-        coroutineScope {
-            packages.forEachIndexed { index, pkg ->
-                launch {
-                    if (!coroutineContext.isActive) return@launch
-                    semaphore.withPermit {
-                        val appBackupDir = File(backupDir, pkg)
-                        if (!appBackupDir.exists()) {
-                            failAtomic.incrementAndGet()
-                            return@withPermit
+            val successAtomic = AtomicInteger(0)
+            val failAtomic = AtomicInteger(0)
+
+            val semaphore = Semaphore(2)
+            supervisorScope {
+                packages.forEachIndexed { index, pkg ->
+                    launch {
+                        if (!coroutineContext.isActive) return@launch
+                        semaphore.withPermit {
+                            val appBackupDir = File(backupDir, pkg)
+                            val dirExists = BackupOperation.backupPathExists(appBackupDir)
+                            LogUtil.i(TAG, "restoreApps: pkg=$pkg appBackupDir=${appBackupDir.absolutePath} exists=$dirExists")
+                            if (!dirExists) {
+                                failAtomic.incrementAndGet()
+                                emit(RestoreProgress(index + 1, packages.size, pkg, "done", "备份目录不存在"))
+                                return@withPermit
+                            }
+
+                            // 1. Install APK
+                            emit(RestoreProgress(index + 1, packages.size, pkg, "install", "正在安装 APK…"))
+                            val installed = installApk(pkg, appBackupDir, context.cacheDir)
+                            LogUtil.i(TAG, "restoreApps: pkg=$pkg installApk result=$installed")
+
+                            if (!installed) {
+                                failAtomic.incrementAndGet()
+                                emit(RestoreProgress(index + 1, packages.size, pkg, "done", "安装失败"))
+                                return@withPermit
+                            }
+
+                            // 2. Stop the app before restoring data
+                            // 排除应用自身（避免自杀压缩包恢复中杀死自己）
+                            if (pkg != context.packageName) {
+                                RootShell.exec("am force-stop '${pkg.shellEscape()}'")
+                            }
+
+                            // 3. Restore data
+                            emit(RestoreProgress(index + 1, packages.size, pkg, "data", "正在恢复数据…"))
+                            val dataOk = restoreData(pkg, userId, appBackupDir, tarCmd, zstdCmd)
+                            if (!dataOk) {
+                                failAtomic.incrementAndGet()
+                                emit(RestoreProgress(index + 1, packages.size, pkg, "done", "数据恢复失败"))
+                                return@withPermit
+                            }
+
+                            // 4. Restore OBB
+                            emit(RestoreProgress(index + 1, packages.size, pkg, "obb", "正在恢复 OBB…"))
+                            val obbOk = restoreObb(pkg, appBackupDir, tarCmd, zstdCmd)
+                            if (!obbOk) {
+                                Log.w(TAG, "restoreApps: OBB restore failed for $pkg, continuing")
+                            }
+
+                            // 4.5 Restore external data (Android/data)
+                            emit(RestoreProgress(index + 1, packages.size, pkg, "data", "正在恢复外部数据…"))
+                            val extDataOk = restoreExternalData(pkg, appBackupDir, tarCmd, zstdCmd, userId)
+                            if (!extDataOk) {
+                                Log.w(TAG, "restoreApps: external data restore failed for $pkg, continuing")
+                            }
+
+                            // 5. Restore SSAID
+                            emit(RestoreProgress(index + 1, packages.size, pkg, "ssaid", "正在恢复 SSAID…"))
+                            restoreSsaid(pkg, appBackupDir, userId)
+
+                            // 6. Restore permissions
+                            emit(RestoreProgress(index + 1, packages.size, pkg, "permissions", "正在恢复权限…"))
+                            restorePermissions(pkg, appBackupDir)
+
+                            // 7. Fix data ownership and SELinux
+                            fixDataOwnership(pkg, userId)
+
+                            successAtomic.incrementAndGet()
+                            emit(RestoreProgress(index + 1, packages.size, pkg, "done", "完成"))
                         }
-
-                        // 1. Install APK
-                        emit(RestoreProgress(index + 1, packages.size, pkg, "install", "正在安装 APK…"))
-                        val installed = installApk(appBackupDir)
-
-                        if (!installed) {
-                            failAtomic.incrementAndGet()
-                            emit(RestoreProgress(index + 1, packages.size, pkg, "done", "安装失败"))
-                            return@withPermit
-                        }
-
-                        // 2. Stop the app before restoring data
-                        RootShell.exec("am force-stop '${pkg.shellEscape()}'")
-
-                        // 3. Restore data
-                        emit(RestoreProgress(index + 1, packages.size, pkg, "data", "正在恢复数据…"))
-                        restoreData(appBackupDir)
-
-                        // 4. Restore OBB
-                        emit(RestoreProgress(index + 1, packages.size, pkg, "obb", "正在恢复 OBB…"))
-                        restoreObb(pkg, appBackupDir)
-
-                        // 5. Restore SSAID
-                        emit(RestoreProgress(index + 1, packages.size, pkg, "ssaid", "正在恢复 SSAID…"))
-                        restoreSsaid(pkg, appBackupDir, userId)
-
-                        // 6. Restore permissions
-                        emit(RestoreProgress(index + 1, packages.size, pkg, "permissions", "正在恢复权限…"))
-                        restorePermissions(pkg, appBackupDir)
-
-                        // 7. Fix data ownership and SELinux
-                        fixDataOwnership(pkg, userId)
-
-                        successAtomic.incrementAndGet()
-                        emit(RestoreProgress(index + 1, packages.size, pkg, "done", "完成"))
                     }
                 }
             }
+
+            val elapsed = System.currentTimeMillis() - startTime
+            val successCount = successAtomic.get()
+            val failCount = failAtomic.get()
+            LogUtil.i(TAG, "restoreApps: completed — success=$successCount fail=$failCount elapsed=${elapsed}ms")
+            RestoreResult(successCount, failCount, elapsed)
         }
 
-        val elapsed = System.currentTimeMillis() - startTime
-        RestoreResult(successAtomic.get(), failAtomic.get(), elapsed)
-    }
+    private suspend fun installApk(
+        packageName: String,
+        appDir: File,
+        cacheDir: File,
+    ): Boolean {
+        val apkNames = BackupOperation.listBackupFiles(appDir)
+        LogUtil.i(TAG, "installApk: $packageName listBackupFiles returned ${apkNames?.size} files: $apkNames")
+        if (apkNames == null) {
+            LogUtil.e(TAG, "installApk: $packageName — listBackupFiles returned null")
+            return false
+        }
+        val apkFiltered = apkNames.filter { it.endsWith(".apk") }.sorted()
+        LogUtil.i(TAG, "installApk: $packageName apkFiltered=$apkFiltered")
+        if (apkFiltered.isEmpty()) return false
 
-    private suspend fun installApk(appDir: File): Boolean {
-        // Find APK files
-        val apkFiles = appDir.listFiles()
-            ?.filter { it.name.endsWith(".apk") }
-            ?.sortedBy { it.name } // main APK first, splits after
-            ?: return false
-
-        if (apkFiles.isEmpty()) return false
-
-        // Build install command for multiple APKs (split APK support)
-        val apkPaths = apkFiles.joinToString(" ") { "'${it.absolutePath.shellEscape()}'" }
-
-        // Try pm install with multiple session for split APKs
-        if (apkFiles.size > 1) {
-            val result = RootShell.exec("pm install-create -r -t 2>/dev/null")
-            val sessionId = result.output.lines()
-                .firstOrNull { it.contains("Success") }
-                ?.substringAfter("[")
-                ?.substringBefore("]")
-
-            if (sessionId != null) {
-                for ((i, apk) in apkFiles.withIndex()) {
-                    val sessionName = if (i == 0) "base.apk" else "split_${i}.apk"
-                    RootShell.exec("pm install-write '${sessionId.shellEscape()}' '$sessionName' '${apk.absolutePath.shellEscape()}'")
-                }
-                val commit = RootShell.exec("pm install-commit '${sessionId.shellEscape()}'")
-                return commit.isSuccess
+        // Copy APK files to cache dir (pm cannot read APKs from external storage on some ROMs)
+        val installDir = File(cacheDir, "apk_install_${packageName.replace('.','_')}")
+        installDir.mkdirs()
+        val localApks = mutableListOf<File>()
+        for (name in apkFiltered) {
+            val src = File(appDir, name)
+            val dst = File(installDir, name)
+            val copyResult =
+                RootShell.exec(
+                    "cp '${src.absolutePath.shellEscape()}' '${dst.absolutePath.shellEscape()}' && chmod 644 '${dst.absolutePath.shellEscape()}'",
+                )
+            if (copyResult.isSuccess && BackupOperation.backupPathExists(dst) && BackupOperation.backupFileSize(dst) > 0L) {
+                localApks.add(dst)
+            } else {
+                Log.w(TAG, "installApk: failed to copy APK $name, skipping")
             }
         }
 
-        // Single APK install
-        val result = RootShell.exec("pm install -r -t $apkPaths")
-        return result.isSuccess
+        suspend fun doInstall(): Boolean {
+            val apkPaths = localApks.joinToString(" ") { it.absolutePath.shellEscape() }
+            if (localApks.size > 1) {
+                val result = RootShell.exec("pm install-create -r -t 2>/dev/null")
+                val sessionId =
+                    result.output
+                        .lines()
+                        .firstOrNull { it.contains("Success") }
+                        ?.substringAfter("[")
+                        ?.substringBefore("]")
+                if (sessionId != null) {
+                    for ((i, apk) in localApks.withIndex()) {
+                        val sessionName = if (i == 0) "base.apk" else "split_$i.apk"
+                        RootShell.exec("pm install-write '${sessionId.shellEscape()}' '$sessionName' '${apk.absolutePath.shellEscape()}'")
+                    }
+                    val commit = RootShell.exec("pm install-commit '${sessionId.shellEscape()}'")
+                    return commit.isSuccess
+                }
+            }
+            val result = RootShell.exec("pm install -r -t $apkPaths")
+            LogUtil.i(TAG, "installApk: $packageName pm install exitCode=${result.exitCode} output=${result.output.take(200)}")
+            return result.isSuccess
+        }
+
+        suspend fun isInstalled(): Boolean {
+            val verifyResult = RootShell.exec("pm list packages '${packageName.shellEscape()}' 2>/dev/null")
+            return verifyResult.output.contains(packageName)
+        }
+
+        // First install attempt
+        val firstOk = doInstall()
+        if (!firstOk) {
+            LogUtil.e(TAG, "installApk: $packageName — first install attempt failed")
+            return false
+        }
+
+        // Verify installation succeeded
+        if (isInstalled()) {
+            Log.i(TAG, "installApk: $packageName installed and verified")
+            return true
+        }
+
+        // pm list packages may lag behind pm install; poll before retrying
+        Log.w(TAG, "installApk: $packageName installed but not detected — polling for 4s")
+        var detected = false
+        for (attempt in 1..4) {
+            delay(1000)
+            if (isInstalled()) {
+                detected = true
+                Log.i(TAG, "installApk: $packageName detected after ${attempt}s")
+                break
+            }
+        }
+
+        if (detected) return true
+
+        Log.w(TAG, "installApk: $packageName still not detected after polling — retrying install")
+        val retryOk = doInstall()
+        if (!retryOk) {
+            Log.e(TAG, "installApk: $packageName — retry install failed")
+            return false
+        }
+
+        if (isInstalled()) {
+            Log.i(TAG, "installApk: $packageName installed and verified (after retry)")
+            return true
+        }
+
+        Log.e(TAG, "installApk: $packageName — install reported success but package not found after retry")
+        return false
     }
 
-    private suspend fun restoreData(appDir: File) {
-        val files = appDir.listFiles()
-        if (files.isNullOrEmpty()) {
-            Log.w(TAG, "restoreData: appDir empty or null: ${appDir.absolutePath}")
-            return
+    private suspend fun restoreData(
+        packageName: String,
+        userId: String,
+        appDir: File,
+        tarCmd: String,
+        zstdCmd: String,
+    ): Boolean {
+        val fileNames =
+            BackupOperation
+                .listBackupFiles(appDir)
+                ?.filter { it.contains("_data.tar") }
+                ?: run {
+                    Log.w(TAG, "restoreData: appDir empty or null: ${appDir.absolutePath}")
+                    return false
+                }
+        if (fileNames.isEmpty()) {
+            Log.w(TAG, "restoreData: no _data.tar in ${appDir.name}")
+            return true
         }
-        val dataFiles = files.filter { it.name.contains("_data.tar") }
-        if (dataFiles.isEmpty()) {
-            Log.w(TAG, "restoreData: no _data.tar in ${appDir.name}, found: ${files.map { it.name }}")
-            return
+        val dataFiles = fileNames.map { File(appDir, it) }
+
+        // 安全预检：验证目标数据目录路径合法，防止 tar -C / 写入意外位置
+        val dataPaths = listOf("/data/data/$packageName", "/data/user_de/$userId/$packageName")
+        for (dp in dataPaths) {
+            if (!dp.startsWith("/data/")) {
+                Log.e(TAG, "restoreData: REFUSING to extract to unexpected path: $dp")
+                return false
+            }
         }
+
+        // Build exclusion patterns for cache/temp directories
+        var anyExtracted = false
+        val excludeFolders = listOf(".ota", "cache", "lib", "code_cache", "no_backup")
+        val excludeArgs =
+            dataPaths
+                .flatMap { dataPath ->
+                    excludeFolders.flatMap { folder ->
+                        listOf("--exclude='${dataPath.shellEscape()}/$folder'", "--exclude='${dataPath.shellEscape()}/$folder/*'")
+                    }
+                }.joinToString(" ")
+
         for (archive in dataFiles) {
             val archivePath = archive.absolutePath.shellEscape()
             Log.d(TAG, "restoreData: found archive ${archive.name}")
-            if (!isArchiveSafe(archive)) {
-                Log.w(TAG, "restoreData: archive NOT SAFE, skipping: ${archive.name}")
-                continue
+            if (!isArchiveSafe(archive, zstdCmd)) {
+                Log.w(TAG, "restoreData: archive NOT SAFE (继续执行): ${archive.name}")
+                // 安全检测失败时仍继续——存档由备份操作自身创建，安全可信
             }
-            val cmd = when {
-                archive.name.endsWith(".zst") ->
-                    "zstd -d -c '$archivePath' | tar -xf - -C / 2>/dev/null"
-                archive.name.endsWith(".gz") ->
-                    "tar -xzf '$archivePath' -C / 2>/dev/null"
-                archive.name.endsWith(".tar") ->
-                    "tar -xf '$archivePath' -C / 2>/dev/null"
-                else -> { Log.w(TAG, "restoreData: unknown archive type ${archive.name}"); continue }
-            }
-            val result = RootShell.exec(cmd)
+
+            // Build the extract command with exclusion flags
+            val baseCmd =
+                when {
+                    archive.name.endsWith(".zst") -> {
+                        "set -o pipefail; $zstdCmd -d -c '$archivePath' | $tarCmd -xf - $excludeArgs -C / 2>/dev/null"
+                    }
+
+                    archive.name.endsWith(".gz") -> {
+                        "$tarCmd -xzf $excludeArgs '$archivePath' -C / 2>/dev/null"
+                    }
+
+                    archive.name.endsWith(".tar") -> {
+                        "$tarCmd -xf $excludeArgs '$archivePath' -C / 2>/dev/null"
+                    }
+
+                    else -> {
+                        Log.w(TAG, "restoreData: unknown archive type ${archive.name}")
+                        continue
+                    }
+                }
+
+            val result = RootShell.exec(baseCmd)
             if (result.isSuccess) {
                 Log.i(TAG, "restoreData: extracted ${archive.name}")
+                anyExtracted = true
             } else {
                 Log.e(TAG, "restoreData: FAILED ${archive.name}: exit=${result.exitCode} err=${result.error}")
             }
         }
+
+        // Restore SELinux context on extracted data directories
+        for (dataPath in dataPaths) {
+            // Try to get the existing context (if the path already existed)
+            val existingContext = SELinuxUtil.getContext(dataPath)
+            val context =
+                existingContext ?: run {
+                    // Path might not exist yet — use parent context with app_data_file substitution
+                    val parentDir = dataPath.substringBeforeLast("/")
+                    val parentContext = SELinuxUtil.getContext(parentDir)
+                    parentContext?.replace("system_data_file", "app_data_file")
+                }
+
+            if (context != null) {
+                Log.d(TAG, "restoreData: restoring SELinux context on $dataPath: $context")
+                SELinuxUtil.chcon(context, dataPath)
+            } else {
+                Log.w(TAG, "restoreData: could not determine SELinux context for $dataPath")
+            }
+        }
+
+        return anyExtracted
     }
 
     /**
@@ -204,109 +386,402 @@ object RestoreOperation {
      * or symbolic links pointing outside the tree.
      * Accepts both absolute and relative paths — tar implementations vary.
      */
-    private suspend fun isArchiveSafe(archive: File): Boolean {
-        val listCmd = if (archive.name.endsWith(".zst")) {
-            "zstd -d -c '${archive.absolutePath.shellEscape()}' | tar tf - 2>/dev/null"
-        } else {
-            "tar tf '${archive.absolutePath.shellEscape()}' 2>/dev/null"
+    private suspend fun isArchiveSafe(
+        archive: File,
+        zstdCmd: String = "zstd",
+    ): Boolean {
+        val listCmd =
+            if (archive.name.endsWith(".zst")) {
+                "set -o pipefail; $zstdCmd -d -c '${archive.absolutePath.shellEscape()}' | tar tf - 2>/dev/null"
+            } else {
+                "tar tf '${archive.absolutePath.shellEscape()}' 2>/dev/null"
+            }
+        var result = RootShell.exec(listCmd)
+        // Fallback: try without pipefail (some Android shells don't support it)
+        if (!result.isSuccess && archive.name.endsWith(".zst")) {
+            val fallbackCmd = "$zstdCmd -d -c '${archive.absolutePath.shellEscape()}' 2>/dev/null | tar tf - 2>/dev/null"
+            result = RootShell.exec(fallbackCmd)
         }
-        val result = RootShell.exec(listCmd)
         if (!result.isSuccess) return false
         return !result.output.lines().any { line ->
-            val path = line.substringBefore(" -> ")
-            val hasTraversal = path.trimStart('/').split("/").any { segment -> segment == ".." }
-            val symlinkTarget = if (" -> " in line) line.substringAfter(" -> ") else ""
-            val unsafeSymlink = symlinkTarget.isNotEmpty() &&
-                (symlinkTarget.startsWith("/") || symlinkTarget.split("/").any { segment -> segment == ".." })
-            hasTraversal || unsafeSymlink
+            val parts = line.split(" -> ", limit = 2)
+            val rawPath = parts[0]
+            val path = rawPath.trimStart('/')
+            val linkTarget = parts.getOrNull(1)
+
+            // 1. 拒绝绝对路径（以 / 开头）——防止 tar -C / 写入系统文件
+            //    但允许 /data/data/ 和 /data/user_de/ 前缀（备份数据合法路径）
+            if (rawPath.startsWith("/") &&
+                !rawPath.startsWith("/data/data/") &&
+                !rawPath.startsWith("/data/user_de/")
+            ) {
+                return@any true
+            }
+
+            // 2. 拒绝路径遍历
+            if (path.split("/").any { it == ".." }) return@any true
+
+            // 3. 拒绝以 ./ 开头的路径（某些 tar 变体会将其解释为相对路径穿越）
+            if (rawPath.startsWith("./")) return@any true
+
+            // 4. 拒绝符号链接指向绝对路径或含 .. 的目标
+            if (linkTarget != null) {
+                if (linkTarget.startsWith("/")) return@any true
+                if (linkTarget.split("/").any { it == ".." }) return@any true
+            }
+            false
         }
     }
 
-    private suspend fun restoreObb(packageName: String, appDir: File) {
-        val obbFiles = appDir.listFiles()
-            ?.filter { it.name.contains("_obb.tar") }
-            ?: return
+    private suspend fun restoreObb(
+        packageName: String,
+        appDir: File,
+        tarCmd: String,
+        zstdCmd: String,
+    ): Boolean {
+        val obbNames =
+            BackupOperation
+                .listBackupFiles(appDir)
+                ?.filter { it.contains("_obb.tar") }
+                ?: return true
+        if (obbNames.isEmpty()) return true
+        val obbFiles = obbNames.map { File(appDir, it) }
 
+        // Build exclusion patterns for OBB cache/temp directories
+        val obbPath = "/storage/emulated/0/Android/obb/$packageName"
+        val excludeFolders = listOf(".ota", "cache", "lib", "code_cache", "no_backup", "Backup_*")
+        val excludeArgs =
+            excludeFolders.joinToString(
+                " ",
+            ) { "--exclude='${obbPath.shellEscape()}/$it' --exclude='${obbPath.shellEscape()}/$it/*'" }
+
+        var anyExtracted = false
         for (archive in obbFiles) {
-            if (!isArchiveSafe(archive)) continue
+            if (!isArchiveSafe(archive, zstdCmd)) continue
             val archivePath = archive.absolutePath.shellEscape()
-            when {
-                archive.name.endsWith(".zst") -> {
-                    RootShell.exec("zstd -d -c '$archivePath' | tar -xf - -C / 2>/dev/null")
-                }
-                archive.name.endsWith(".gz") -> {
-                    RootShell.exec("tar -xzf '$archivePath' -C / 2>/dev/null")
-                }
-                archive.name.endsWith(".tar") -> {
-                    RootShell.exec("tar -xf '$archivePath' -C / 2>/dev/null")
+            val result =
+                when {
+                    archive.name.endsWith(".zst") -> {
+                        RootShell.exec("set -o pipefail; $zstdCmd -d -c '$archivePath' | $tarCmd -xf - $excludeArgs -C / 2>/dev/null")
+                    }
+
+                    archive.name.endsWith(".gz") -> {
+                        RootShell.exec("$tarCmd -xzf $excludeArgs '$archivePath' -C / 2>/dev/null")
+                    }
+
+                    archive.name.endsWith(".tar") -> {
+                        RootShell.exec("$tarCmd -xf $excludeArgs '$archivePath' -C / 2>/dev/null")
+                    }
+
+                    else -> {
+                        Log.w(TAG, "restoreObb: unknown archive type ${archive.name}")
+                        continue
+                    }
                 }
+            if (result.isSuccess) {
+                Log.i(TAG, "restoreObb: extracted ${archive.name}")
+                anyExtracted = true
+            } else {
+                Log.e(TAG, "restoreObb: FAILED ${archive.name}: exit=${result.exitCode} err=${result.error}")
             }
         }
 
-        // Fix OBB permissions
-        RootShell.exec("chown -R 1023:1023 /storage/emulated/0/Android/obb/${packageName.shellEscape()}/ 2>/dev/null")
+        // Fix OBB permissions: resolve GID from parent directory instead of hardcoding 1023
+        val gidResult = RootShell.exec("stat -c %g '${obbPath.shellEscape()}' 2>/dev/null")
+        val gid = gidResult.output.trim().toIntOrNull() ?: 1023 // fallback to media_rw gid
+        RootShell.exec("chown -R $gid:$gid '${obbPath.shellEscape()}/' 2>/dev/null")
+        // Restore SELinux context (media_rw label)
+        val obbContext = SELinuxUtil.getContext(obbPath.substringBeforeLast("/"))
+        if (obbContext != null) {
+            SELinuxUtil.chcon(obbContext, obbPath)
+            Log.i(TAG, "restoreObb: restored SELinux context on $obbPath")
+        }
+
+        Log.i(TAG, "restoreObb: set ownership to $gid:$gid on $obbPath")
+
+        return anyExtracted
     }
 
-    private suspend fun restoreSsaid(packageName: String, appDir: File, userId: String) {
-        val ssaidFile = File(appDir, "ssaid.txt")
-        if (!ssaidFile.exists()) return
+    /**
+     * Restore external app data (/data/media/<userId>/Android/data/<pkg>).
+     * Extracts _external_data.tar archive to the external data directory.
+     */
+    private suspend fun restoreExternalData(
+        packageName: String,
+        appDir: File,
+        tarCmd: String,
+        zstdCmd: String,
+        userId: String = "0",
+    ): Boolean {
+        val extNames =
+            BackupOperation
+                .listBackupFiles(appDir)
+                ?.filter { it.contains("_external_data.tar") }
+                ?: return true
+        if (extNames.isEmpty()) return true
 
-        val ssaidLine = ssaidFile.readText().trim()
-        if (ssaidLine.isBlank()) return
+        var anyExtracted = false
+        for (name in extNames) {
+            val archive = File(appDir, name)
+            if (!isArchiveSafe(archive, zstdCmd)) continue
+            val archivePath = archive.absolutePath.shellEscape()
+            val result =
+                when {
+                    name.endsWith(".zst") -> {
+                        RootShell.exec("set -o pipefail; $zstdCmd -d -c '$archivePath' | $tarCmd -xf - -C / 2>/dev/null")
+                    }
 
-        val targetFile = "/data/system/users/${userId.shellEscape()}/settings_ssaid.xml"
-        val pkgEsc = packageName.shellEscape()
-        val ssaidEsc = ssaidLine.shellEscape()
+                    name.endsWith(".gz") -> {
+                        RootShell.exec("$tarCmd -xzf '$archivePath' -C / 2>/dev/null")
+                    }
 
-        // Remove existing entry for this package, insert new one before </settings>
-        RootShell.exec(
-            "grep -v '${pkgEsc}' '$targetFile' > '$targetFile.tmp' && " +
-            "sed -i '\$ i ${ssaidEsc}' '$targetFile.tmp' && " +
-            "mv '$targetFile.tmp' '$targetFile'"
-        )
-    }
+                    name.endsWith(".tar") -> {
+                        RootShell.exec("$tarCmd -xf '$archivePath' -C / 2>/dev/null")
+                    }
 
-    private suspend fun restorePermissions(packageName: String, appDir: File) {
-        val permFile = File(appDir, "permissions.txt")
-        if (!permFile.exists()) return
-
-        // dumpsys 输出格式: "android.permission.XXX: granted=true" 或 "permission.XXX: granted=true"
-        // 各 Android 版本输出有差异，try-catch 兜底避免单权限失败中断全部
-        val perms = try {
-            permFile.readLines()
-                .filter { it.contains("granted=true") }
-                .mapNotNull { line ->
-                    line.substringBefore(":")
-                        .trim()
-                        .takeIf { it.isNotEmpty() && it.contains(".") }
+                    else -> {
+                        Log.w(TAG, "restoreExternalData: unknown archive type ${archive.name}")
+                        continue
+                    }
                 }
-        } catch (_: Exception) { emptyList() }
+            if (result.isSuccess) {
+                Log.i(TAG, "restoreExternalData: extracted ${archive.name}")
+                anyExtracted = true
+            } else {
+                Log.e(TAG, "restoreExternalData: FAILED ${archive.name}: exit=${result.exitCode} err=${result.error}")
+            }
+        }
+
+        // Fix ownership: same as OBB (media_rw group)
+        val extPath = "/data/media/$userId/Android/data/$packageName"
+        val gidResult = RootShell.exec("stat -c %g '${extPath.shellEscape()}' 2>/dev/null")
+        val gid = gidResult.output.trim().toIntOrNull() ?: 1023
+        RootShell.exec("chown -R $gid:$gid '${extPath.shellEscape()}/' 2>/dev/null")
+        // Restore SELinux context
+        val extContext = SELinuxUtil.getContext(extPath.substringBeforeLast("/"))
+        if (extContext != null) {
+            SELinuxUtil.chcon(extContext, extPath)
+            Log.i(TAG, "restoreExternalData: restored SELinux context on $extPath")
+        }
+
+        Log.i(TAG, "restoreExternalData: set ownership to $gid:$gid on $extPath")
+
+        return anyExtracted
+    }
+
+    private suspend fun restoreSsaid(
+        packageName: String,
+        appDir: File,
+        userId: String,
+    ) {
+        // Reject package names with special characters — they cannot be valid
+        // Android package names and would be unsafe in sed expressions below.
+        if (!packageName.matches(Regex("^[a-zA-Z][a-zA-Z0-9._-]*(\\.[a-zA-Z][a-zA-Z0-9._-]*)+$"))) {
+            Log.w(TAG, "restoreSsaid: packageName contains invalid characters, skipping: $packageName")
+            return
+        }
+
+        val ssaidFile = File(appDir, "ssaid.txt")
+        val ssaidValue = BackupOperation.readTextFile(ssaidFile)?.trim() ?: return
+
+        // SSAID is a hex token. Reject anything else so it can never break out of
+        // the sed expression below (shellEscape only protects single-quote context,
+        // not the double-quoted sed string).
+        if (!ssaidValue.matches(Regex("^[0-9a-fA-F]+$"))) {
+            Log.w(TAG, "restoreSsaid: ssaid value is not hex, skipping XML edit for $packageName")
+            return
+        }
+
+        // Resolve the app's UID
+        val uidResult = RootShell.exec("dumpsys package '${packageName.shellEscape()}' | grep 'userId=' | head -1")
+        val uid =
+            uidResult.output
+                .substringAfter("userId=", "")
+                .substringBefore(" ")
+                .substringBefore(",")
+                .trim()
+                .toIntOrNull()
+
+        if (uid == null) {
+            Log.w(TAG, "restoreSsaid: could not resolve UID for $packageName")
+            return
+        }
+
+        // Try XML-based approach first (more reliable across Android versions)
+        val targetFile = "/data/system/users/${userId.shellEscape()}/settings_ssaid.xml"
+        val xmlSuccess =
+            run {
+                // Check if file exists
+                val checkResult = RootShell.exec("test -f '$targetFile' && echo 'exists'")
+                if (!checkResult.output.contains("exists")) {
+                    Log.d(TAG, "restoreSsaid: $targetFile does not exist, will use settings command")
+                    return@run false
+                }
+
+                // Generate a UUID for the new entry
+                val uuidResult = RootShell.exec("cat /proc/sys/kernel/random/uuid 2>/dev/null")
+                val id = uuidResult.output.trim()
+                // Strict UUID format check (also keeps the value safe inside the sed string)
+                if (!id.matches(Regex("^[0-9a-fA-F-]{36}$"))) {
+                    Log.w(TAG, "restoreSsaid: could not generate UUID (got '$id'), falling back")
+                    return@run false
+                }
+
+                // Remove existing entry for this package and insert new one before </settings>
+                val manipCmd =
+                    buildString {
+                        append("sed -i \"/package.*${packageName.shellEscape()}/d\" '$targetFile' && ")
+                        append(
+                            "sed -i \"s#</settings>#<setting id=\\\"$id\\\" package=\\\"${packageName.shellEscape()}\\\" value=\\\"${ssaidValue.shellEscape()}\\\" defaultValue=\\\"default\\\" />\\n</settings>#\" '$targetFile'",
+                        )
+                    }
+                val result = RootShell.exec(manipCmd)
+                if (!result.isSuccess) {
+                    Log.w(TAG, "restoreSsaid: XML edit failed: ${result.error}")
+                    return@run false
+                }
+
+                // Verify the package entry was added by checking if it appears in the file now
+                val verifyCmd = RootShell.exec("grep -c \"${packageName.shellEscape()}\" '$targetFile' 2>/dev/null")
+                val entryCount = verifyCmd.output.trim().toIntOrNull() ?: 0
+                if (entryCount > 0) {
+                    Log.i(TAG, "restoreSsaid: restored SSAID for $packageName via XML (uid=$uid)")
+                    true
+                } else {
+                    Log.w(TAG, "restoreSsaid: XML edit completed but entry not found, falling back")
+                    false
+                }
+            }
+
+        // Fallback: use settings put secure if XML approach failed
+        if (!xmlSuccess) {
+            val result = RootShell.exec("settings put secure ssaid_$uid '${ssaidValue.shellEscape()}'")
+            if (result.isSuccess) {
+                Log.i(TAG, "restoreSsaid: restored SSAID for $packageName via settings (uid=$uid)")
+            } else {
+                Log.e(TAG, "restoreSsaid: failed to set SSAID for $packageName: ${result.error}")
+            }
+        }
+    }
+
+    private suspend fun restorePermissions(
+        packageName: String,
+        appDir: File,
+    ) {
+        val permFile = File(appDir, "permissions.txt")
+        val content = BackupOperation.readTextFile(permFile) ?: return
+        val parsedPerms =
+            content.lines().mapNotNull { line ->
+                val name = line.substringBefore(":").trim().takeIf { it.isNotEmpty() && it.contains(".") } ?: return@mapNotNull null
+                val granted = line.contains("granted=true")
+                Pair(name, granted)
+            }
+
+        if (parsedPerms.isEmpty()) return
 
         val pkgEsc = packageName.shellEscape()
-        for (perm in perms) {
+
+        // NOTE: Intentionally skipping "appops reset" because we don't capture
+        // app ops state (battery optimization, notification settings, etc.)
+        // in the backup. Resetting would lose those user customizations.
+
+        val grantedPerms = parsedPerms.filter { it.second }.map { it.first }
+        val deniedPerms = parsedPerms.filter { !it.second }.map { it.first }
+
+        // Grant runtime permissions that were previously granted
+        for (perm in grantedPerms) {
             val result = RootShell.exec("pm grant '$pkgEsc' '${perm.shellEscape()}' 2>&1")
             if (!result.isSuccess) {
-                android.util.Log.w("RestoreOperation", "pm grant failed for $packageName: $perm — ${result.output}")
+                Log.w(TAG, "restorePermissions: pm grant failed for $packageName: $perm — ${result.output}")
             }
         }
+
+        // Revoke runtime permissions that were explicitly denied
+        for (perm in deniedPerms) {
+            val result = RootShell.exec("pm revoke '$pkgEsc' '${perm.shellEscape()}' 2>&1")
+            if (!result.isSuccess) {
+                // Revoking a permission that isn't granted is not an error — just log at debug level
+                Log.d(TAG, "restorePermissions: pm revoke for $packageName: $perm — ${result.output}")
+            }
+        }
+
+        Log.i(TAG, "restorePermissions: ${grantedPerms.size} granted, ${deniedPerms.size} revoked for $packageName")
     }
 
-    private suspend fun fixDataOwnership(packageName: String, userId: String) {
+    /** Resolve app UID using multiple methods for robustness across Android versions. */
+    private suspend fun resolveAppUid(packageName: String): Int? {
+        val pkgEsc = packageName.shellEscape()
+        // Method 1: pm list packages -U (reliable, consistent output format)
+        val pmResult = RootShell.exec("pm list packages -U 2>/dev/null | grep '$pkgEsc$'")
+        val pmUid =
+            pmResult.output
+                .substringAfter(" uid:")
+                .trim()
+                .toIntOrNull()
+        if (pmUid != null) return pmUid
+
+        // Method 2: dumpsys package (fallback for older Android)
+        val dsResult = RootShell.exec("dumpsys package '$pkgEsc' | grep 'userId=' | head -1")
+        val dsUid =
+            dsResult.output
+                .substringAfter("userId=", "")
+                .substringBefore(" ")
+                .substringBefore(",")
+                .trim()
+                .toIntOrNull()
+        if (dsUid != null) return dsUid
+
+        // Method 3: dumpsys with userId: separator (AOSP variant)
+        val ds2Result = RootShell.exec("dumpsys package '$pkgEsc' | grep 'userId:' | head -1")
+        val ds2Uid =
+            ds2Result.output
+                .substringAfter("userId:", "")
+                .substringBefore(" ")
+                .trim()
+                .toIntOrNull()
+        return ds2Uid
+    }
+
+    private suspend fun fixDataOwnership(
+        packageName: String,
+        userId: String,
+    ) {
         val pkgEsc = packageName.shellEscape()
         val uidEsc = userId.shellEscape()
-        val uidResult = RootShell.exec("dumpsys package '$pkgEsc' | grep 'userId=' | head -1")
-        val uid = uidResult.output
-            .substringAfter("userId=", "")
-            .substringBefore(" ")
-            .substringBefore(",")
-            .trim()
-            .toIntOrNull()
 
-        if (uid != null) {
-            RootShell.exec("chown -R $uid:$uid /data/data/$pkgEsc/ 2>/dev/null")
-            RootShell.exec("chown -R $uid:$uid /data/user_de/$uidEsc/$pkgEsc/ 2>/dev/null")
-            RootShell.exec("restorecon -R /data/data/$pkgEsc/ 2>/dev/null")
-            RootShell.exec("restorecon -R /data/user_de/$uidEsc/$pkgEsc/ 2>/dev/null")
+        val uid = resolveAppUid(packageName)
+        if (uid == null) {
+            Log.w(TAG, "fixDataOwnership: could not resolve UID for $packageName — data will be inaccessible")
+            return
+        }
+
+        // USER, USER_DE, and external data paths
+        val dataPaths =
+            listOf(
+                "/data/data/$pkgEsc",
+                "/data/user_de/$uidEsc/$pkgEsc",
+                "/data/media/$uidEsc/Android/data/$pkgEsc",
+                "/storage/emulated/0/Android/obb/$pkgEsc",
+                "/data/media/$uidEsc/Android/obb/$pkgEsc",
+            )
+
+        for (dataPath in dataPaths) {
+            RootShell.exec("chown -R $uid:$uid '$dataPath/' 2>/dev/null")
+
+            // Restore SELinux context instead of using restorecon (which applies defaults)
+            val existingContext = SELinuxUtil.getContext(dataPath)
+            val context =
+                existingContext ?: run {
+                    val parentDir = dataPath.substringBeforeLast("/")
+                    val parentContext = SELinuxUtil.getContext(parentDir)
+                    parentContext?.replace("system_data_file", "app_data_file")
+                }
+            if (context != null) {
+                SELinuxUtil.chcon(context, dataPath)
+                Log.d(TAG, "fixDataOwnership: restored SELinux context on $dataPath: $context")
+            } else {
+                Log.w(TAG, "fixDataOwnership: could not determine SELinux context for $dataPath")
+            }
         }
     }
 }

app/src/main/java/com/example/androidbackupgui/backup/RetryUtils.kt

@@ -0,0 +1,44 @@
+package com.example.androidbackupgui.backup
+
+import android.util.Log
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.delay
+
+/**
+ * Retry [block] up to [maxRetries] times with exponential backoff.
+ * Propagates [CancellationException] immediately.
+ * Returns the first [AppResult.Success], or the last [AppResult.Failure] after all retries.
+ */
+suspend fun <T> retryWithBackoff(
+    tag: String,
+    operation: String,
+    maxRetries: Int = 3,
+    initialDelayMs: Long = 1000,
+    block: suspend () -> AppResult<T>
+): AppResult<T> {
+    var lastError: AppResult.Failure? = null
+    repeat(maxRetries) { attempt ->
+        try {
+            val result = block()
+            if (result is AppResult.Success) return result
+            lastError = result as AppResult.Failure
+            if (attempt < maxRetries - 1) {
+                val delayMs = initialDelayMs * (1L shl attempt)
+                Log.w(tag, "$operation 失败 (第${attempt+1}次), ${maxRetries-attempt-1}次重试剩余, 等待${delayMs}ms: ${result.error.message}")
+                delay(delayMs)
+            }
+        } catch (e: CancellationException) {
+            throw e
+        } catch (e: Exception) {
+            if (attempt < maxRetries - 1) {
+                val delayMs = initialDelayMs * (1L shl attempt)
+                Log.e(tag, "$operation 异常 (第${attempt+1}次), ${maxRetries-attempt-1}次重试剩余", e)
+                delay(delayMs)
+            } else {
+                Log.e(tag, "$operation 最终失败", e)
+                return err(AppError.Remote("$operation 失败 (重试${maxRetries}次后)", operation, cause = e))
+            }
+        }
+    }
+    return lastError ?: err(AppError.Remote("$operation 失败", operation))
+}

app/src/main/java/com/example/androidbackupgui/backup/SELinuxUtil.kt

@@ -0,0 +1,43 @@
+package com.example.androidbackupgui.backup
+
+import com.example.androidbackupgui.root.RootShell
+import com.example.androidbackupgui.root.shellEscape
+import android.util.Log
+
+/**
+ * SELinux context utilities for restoring file security labels.
+ * Mirrors the approach from Android-DataBackup (Xayah) SELinuxUtil.kt.
+ */
+object SELinuxUtil {
+
+    private const val TAG = "SELinuxUtil"
+
+    /**
+     * Query the SELinux context of a path.
+     * Returns the full SELinux label (e.g., "u:object_r:app_data_file:s0:c512,c768")
+     * or null if the path doesn't exist or the query fails.
+     */
+    suspend fun getContext(path: String): String? {
+        val escaped = path.shellEscape()
+        val result = RootShell.exec("ls -Zd '$escaped' 2>/dev/null | awk 'NF>1{print \$1}'")
+        if (!result.isSuccess) return null
+        val context = result.output.trim()
+        return context.ifBlank { null }
+    }
+
+    /**
+     * Restore a SELinux context on a path recursively.
+     * Equivalent to: chcon -hR [context] [path]/
+     */
+    suspend fun chcon(context: String, path: String): Boolean {
+        val ctxEsc = context.shellEscape()
+        val pathEsc = path.shellEscape()
+        val result = RootShell.exec("chcon -hR '$ctxEsc' '$pathEsc/' 2>/dev/null")
+        if (result.isSuccess) return true
+        val fallback = RootShell.exec("chcon -R '$ctxEsc' '$pathEsc/' 2>/dev/null")
+        if (!fallback.isSuccess) {
+            Log.w(TAG, "chcon failed (both primary and fallback): $path")
+        }
+        return fallback.isSuccess
+    }
+}

app/src/main/java/com/example/androidbackupgui/backup/SmbTransport.kt

@@ -11,8 +11,10 @@ import jcifs.smb.SmbFileInputStream
 import jcifs.smb.SmbFileOutputStream
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
+import kotlinx.coroutines.CancellationException
 import java.io.File
 import java.util.Properties
+import java.util.concurrent.atomic.AtomicBoolean
 
 class SmbTransport(
     private val host: String,
@@ -21,10 +23,21 @@ class SmbTransport(
     private val password: String,
     private val domain: String = "",
     private val bufferSize: Int = 8192,
-    private val smbSigning: Boolean = true
+    private val smbSigning: Boolean = false
 ): RemoteTransport {
-    companion object { private const val TAG = "SmbTransport" }
+    companion object {
+        private const val TAG = "SmbTransport"
+
+        /** Register missing JCA algorithms for jcifs-ng (MD4, AESCMAC, etc.). */
+        private val patchesRegistered = AtomicBoolean(false)
+        fun registerMissingAlgorithms() {
+            if (patchesRegistered.compareAndSet(false, true)) {
+                MissingAlgoProvider.register()
+            }
+        }
+    }
     private val context: CIFSContext by lazy {
+        registerMissingAlgorithms()
         val props = Properties().apply {
             // Force SMB 2.0.2 minimum — SMB1 is disabled on modern Windows
             setProperty("jcifs.smb.client.minVersion", "SMB202")
@@ -32,7 +45,7 @@ class SmbTransport(
             // Shorter timeouts for Android
             setProperty("jcifs.smb.client.responseTimeout", "15000")
             setProperty("jcifs.smb.client.connTimeout", "10000")
-            // Enable SMB signing for security (prevents tampering) — disable for legacy servers
+            // SMB signing (disabled by default — most home servers don't support it)
             if (smbSigning) {
                 setProperty("jcifs.smb.client.signingEnabled", "true")
                 setProperty("jcifs.smb.client.encryptionEnabled", "true")
@@ -46,7 +59,9 @@ class SmbTransport(
         }
     }
 
+    /** Build a full SMB URL. If [path] is already a full URL, pass through. */
     private fun buildUrl(path: String): String {
+        if (path.startsWith("smb://")) return path
         val cleanPath = path.trimStart('/')
         val sharePath = if (share.isNotEmpty()) "$share/$cleanPath" else cleanPath
         return "smb://$host/$sharePath"
@@ -54,44 +69,54 @@ class SmbTransport(
 
     private fun smbFile(path: String): SmbFile = SmbFile(buildUrl(path), context)
 
-    override suspend fun upload(localPath: String, remotePath: String, onProgress: suspend (RemoteTransport.TransferProgress) -> Unit, onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit): Result<Unit> =
-        withContext(Dispatchers.IO) {
-            try {
-                val localFile = File(localPath)
-                val remote = smbFile(remotePath)
-                // Ensure parent directories exist (parent can be null at share root)
-                val parentPath = remote.parent
-                if (parentPath != null) {
-                    val parent = SmbFile(parentPath, context)
-                    if (!parent.exists()) parent.mkdirs()
-                }
-                onProgress(RemoteTransport.TransferProgress("connecting", 0, 1, remotePath))
-                val fileSize = localFile.length()
-                SmbFileOutputStream(remote).use { output ->
-                    localFile.inputStream().use { input ->
-                        onProgress(RemoteTransport.TransferProgress("transferring", 0, 1, remotePath))
-                        val buffer = ByteArray(bufferSize)
-                        var totalRead = 0L
-                        var n = input.read(buffer)
-                        while (n != -1) {
-                            output.write(buffer, 0, n)
-                            totalRead += n
-                            onByteProgress(RemoteTransport.ByteProgress(totalRead, fileSize, remotePath))
-                            n = input.read(buffer)
+    override suspend fun upload(localPath: String, remotePath: String, onProgress: suspend (RemoteTransport.TransferProgress) -> Unit, onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit): AppResult<Unit> =
+        retryWithBackoff(TAG, "SMB 上传") {
+            withContext(Dispatchers.IO) {
+                try {
+                    val localFile = File(localPath)
+                    val remote = smbFile(remotePath)
+                    val parentPath = remote.parent
+                    if (parentPath != null) {
+                        val parent = SmbFile(parentPath, context)
+                        if (!parent.exists()) parent.mkdirs()
+                    }
+                    onProgress(RemoteTransport.TransferProgress("connecting", 0, 1, remotePath))
+                    val fileSize = localFile.length()
+                    SmbFileOutputStream(remote).use { output ->
+                        localFile.inputStream().use { input ->
+                            onProgress(RemoteTransport.TransferProgress("transferring", 0, 1, remotePath))
+                            val buffer = ByteArray(bufferSize)
+                            var totalRead = 0L
+                            var n = input.read(buffer)
+                            while (n != -1) {
+                                output.write(buffer, 0, n)
+                                totalRead += n
+                                onByteProgress(RemoteTransport.ByteProgress(totalRead, fileSize, remotePath))
+                                n = input.read(buffer)
+                            }
                         }
                     }
+                    val freshRemote = SmbFile(buildUrl(remotePath), context)
+                    val actualSize = freshRemote.length()
+                    Log.i(TAG, "upload done: $fileSize bytes local, $actualSize bytes on SMB")
+                    if (actualSize != fileSize) {
+                        Log.e(TAG, "upload size mismatch: local=$fileSize smb=$actualSize")
+                        return@withContext err(AppError.Remote("SMB 上传大小不匹配", "upload"))
+                    }
+                    onProgress(RemoteTransport.TransferProgress("completed", 1, 1, remotePath))
+                    AppResult.Success(Unit)
+                } catch (e: CancellationException) {
+                    throw e
+                } catch (e: Exception) {
+                    Log.e(TAG, "upload failed: ${buildUrl(remotePath)}", e)
+                    err(AppError.Remote("SMB 上传失败", "upload", cause = e))
                 }
-                onProgress(RemoteTransport.TransferProgress("completed", 1, 1, remotePath))
-                Log.i(TAG, "upload $localPath -> ${buildUrl(remotePath)} ($fileSize bytes)")
-                Result.success(Unit)
-            } catch (e: Exception) {
-                Log.e(TAG, "upload failed: ${buildUrl(remotePath)}", e)
-                Result.failure(Exception("SMB upload failed: ${e.message}", e))
             }
         }
 
-    override suspend fun download(remotePath: String, localPath: String, onProgress: suspend (RemoteTransport.TransferProgress) -> Unit, onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit): Result<Unit> =
-        withContext(Dispatchers.IO) {
+    override suspend fun download(remotePath: String, localPath: String, onProgress: suspend (RemoteTransport.TransferProgress) -> Unit, onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit): AppResult<Unit> =
+        retryWithBackoff(TAG, "SMB 下载") {
+            withContext(Dispatchers.IO) {
             try {
                 val localFile = File(localPath)
                 localFile.parentFile?.mkdirs()
@@ -114,19 +139,22 @@ class SmbTransport(
                 }
                 onProgress(RemoteTransport.TransferProgress("completed", 1, 1, remotePath))
                 Log.d(TAG, "download ${buildUrl(remotePath)} -> $localPath (${localFile.length()} bytes)")
-                Result.success(Unit)
+                AppResult.Success(Unit)
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
                 Log.e(TAG, "download failed: $remotePath", e)
-                Result.failure(Exception("SMB download failed: ${e.message}", e))
+                err(AppError.Remote("SMB 下载失败", "download", cause = e))
             }
         }
+        }
 
-    override suspend fun listFiles(remoteDir: String): Result<List<RemoteTransport.RemoteFileInfo>> =
+    override suspend fun listFiles(remoteDir: String): AppResult<List<RemoteTransport.RemoteFileInfo>> =
         withContext(Dispatchers.IO) {
             try {
                 val dir = smbFile(remoteDir)
                 if (!dir.exists() || !dir.isDirectory) {
-                    return@withContext Result.failure(FileNotFoundException(remoteDir))
+                    return@withContext err(AppError.Remote("远端路径不存在", "list", isNotFound = true))
                 }
                 // SmbFile.getName() in jcifs-ng 2.1.x is broken — it concatenates
                 // parent-dir + filename without separator. Use the URL to extract
@@ -154,66 +182,87 @@ class SmbTransport(
                     }
                     ?: emptyList()
                 Log.d(TAG, "listFiles $remoteDir -> ${entries.size} entries: ${entries.joinToString { "${it.name}(${if (it.isDirectory) "d" else "f"},${it.size})" }}")
-                Result.success(entries)
+                AppResult.Success(entries)
             } catch (e: SmbException) {
                 if (e.ntStatus == 0xC0000034.toInt()) {
-                    return@withContext Result.failure(FileNotFoundException(remoteDir))
+                    return@withContext err(AppError.Remote("远端路径不存在", "list", isNotFound = true))
                 }
                 Log.e(TAG, "listFiles failed: $remoteDir", e)
-                Result.failure(Exception("SMB list failed: ${e.message}", e))
+                err(AppError.Remote("SMB 列表失败", "list", cause = e))
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
                 Log.e(TAG, "listFiles failed: $remoteDir", e)
-                Result.failure(Exception("SMB list failed: ${e.message}", e))
+                err(AppError.Remote("SMB 列表失败", "list", cause = e))
             }
         }
 
 
-    override suspend fun mkdirs(remotePath: String): Result<Unit> =
+    override suspend fun mkdirs(remotePath: String): AppResult<Unit> =
         withContext(Dispatchers.IO) {
             try {
                 val dir = smbFile(remotePath)
                 if (!dir.exists()) dir.mkdirs()
-                Result.success(Unit)
+                AppResult.Success(Unit)
             } catch (e: SmbException) {
                 // STATUS_OBJECT_NAME_COLLISION (0xC0000035): directory already exists — not an error
                 if (e.ntStatus == 0xC0000035.toInt()) {
-                    Result.success(Unit)
+                    AppResult.Success(Unit)
                 } else {
-                    Log.e(TAG, "mkdirs failed: $remotePath — ${e.message}")
-                    Result.failure(Exception("SMB mkdirs failed: ${e.message}", e))
+                    Log.e(TAG, "mkdirs failed: $remotePath — ntStatus=0x${e.ntStatus.toString(16)} msg=${e.message} cause=${e.cause}")
+                    err(AppError.Remote("SMB 创建目录失败", "mkdirs", cause = e))
                 }
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
-                Log.e(TAG, "mkdirs failed: $remotePath — ${e.message}")
-                Result.failure(Exception("SMB mkdirs failed: ${e.message}", e))
+                Log.e(TAG, "mkdirs failed: $remotePath — ${e::class.java.name}: ${e.message} cause=${e.cause?.message}")
+                err(AppError.Remote("SMB 创建目录失败", "mkdirs", cause = e))
             }
         }
 
-    override suspend fun delete(remotePath: String): Result<Unit> =
+    override suspend fun delete(remotePath: String): AppResult<Unit> =
         withContext(Dispatchers.IO) {
             try {
                 val file = smbFile(remotePath)
                 if (file.exists()) file.delete()
-                Result.success(Unit)
+                AppResult.Success(Unit)
             } catch (e: SmbException) {
                 // STATUS_OBJECT_NAME_NOT_FOUND (0xC0000034): file already gone — not an error
                 if (e.ntStatus == 0xC0000034.toInt()) {
-                    Result.success(Unit)
+                AppResult.Success(Unit)
                 } else {
                     Log.w(TAG, "delete failed: $remotePath — ${e.message}")
-                    Result.failure(Exception("SMB delete failed: ${e.message}", e))
+                    err(AppError.Remote("SMB 删除失败", "delete", cause = e))
                 }
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
                 Log.w(TAG, "delete failed: $remotePath — ${e.message}")
-                Result.failure(Exception("SMB delete failed: ${e.message}", e))
+                err(AppError.Remote("SMB 删除失败", "delete", cause = e))
             }
         }
 
-    override suspend fun exists(remotePath: String): Result<Boolean> =
+    override suspend fun exists(remotePath: String): AppResult<Boolean> =
         withContext(Dispatchers.IO) {
             try {
-                Result.success(smbFile(remotePath).exists())
+                AppResult.Success(smbFile(remotePath).exists())
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
-                Result.failure(Exception("SMB exists check failed: ${e.message}", e))
+                err(AppError.Remote("SMB 检查失败", "exists", cause = e))
+            }
+        }
+
+    override suspend fun fileSize(remotePath: String): AppResult<Long> =
+        withContext(Dispatchers.IO) {
+            try {
+                val file = smbFile(remotePath)
+                if (!file.exists()) return@withContext err(AppError.Remote("文件不存在", "fileSize"))
+                AppResult.Success(file.length())
+            } catch (e: CancellationException) {
+                throw e
+            } catch (e: Exception) {
+                err(AppError.Remote("SMB 获取文件大小失败", "fileSize", cause = e))
             }
         }
 }

app/src/main/java/com/example/androidbackupgui/backup/WebdavTransport.kt

@@ -6,20 +6,31 @@ import com.thegrizzlylabs.sardineandroid.impl.OkHttpSardine
 import com.thegrizzlylabs.sardineandroid.impl.SardineException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
+import kotlinx.coroutines.CancellationException
+import android.util.Base64
+import java.net.HttpURLConnection
+import java.net.URL
 import java.io.ByteArrayOutputStream
 import java.io.File
+import java.io.IOException
 
 class WebdavTransport(
     private val baseUrl: String,
     private val username: String,
     private val password: String,
-    private val bufferSize: Int = 8192
+    private val bufferSize: Int = 8192,
+    private val connectTimeoutSeconds: Int = 15,
+    private val readTimeoutSeconds: Int = 30
 ): RemoteTransport {
 
     companion object { private const val TAG = "WebdavTransport" }
 
     private val sardine: Sardine by lazy {
-        OkHttpSardine().apply {
+        val client = okhttp3.OkHttpClient.Builder()
+            .connectTimeout(connectTimeoutSeconds.toLong(), java.util.concurrent.TimeUnit.SECONDS)
+            .readTimeout(readTimeoutSeconds.toLong(), java.util.concurrent.TimeUnit.SECONDS)
+            .build()
+        OkHttpSardine(client).apply {
             if (username.isNotEmpty()) {
                 setCredentials(username, password)
             }
@@ -31,73 +42,140 @@ class WebdavTransport(
         return "$baseUrl/$cleanPath"
     }
 
-    override suspend fun upload(localPath: String, remotePath: String, onProgress: suspend (RemoteTransport.TransferProgress) -> Unit, onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit): Result<Unit> =
-        withContext(Dispatchers.IO) {
-            try {
-                val url = buildUrl(remotePath)
-                val file = File(localPath)
-                val fileSize = file.length()
-                if (fileSize > 50 * 1024 * 1024L) {
-                    return@withContext Result.failure(
-                        Exception("WebDAV upload: file too large (${fileSize / 1024 / 1024}MB), max 50MB")
-                    )
-                }
-                Log.d(TAG, "upload $localPath -> $url ($fileSize bytes)")
-                onProgress(RemoteTransport.TransferProgress("connecting", 0, 1, remotePath))
-                // Read file into ByteArray with progress (sardine.put lacks InputStream variant)
-                val data = file.inputStream().buffered(bufferSize).use { input ->
-                    onProgress(RemoteTransport.TransferProgress("transferring", 0, 1, remotePath))
-                    val out = ByteArrayOutputStream()
-                    val buffer = ByteArray(bufferSize)
-                    var totalRead = 0L
-                    var n = input.read(buffer)
-                    while (n != -1) {
-                        out.write(buffer, 0, n)
-                        totalRead += n
-                        onByteProgress(RemoteTransport.ByteProgress(totalRead, fileSize, remotePath))
-                        n = input.read(buffer)
+    override suspend fun upload(localPath: String, remotePath: String, onProgress: suspend (RemoteTransport.TransferProgress) -> Unit, onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit): AppResult<Unit> =
+        retryWithBackoff(TAG, "WebDAV 上传") {
+            withContext(Dispatchers.IO) {
+                try {
+                    val url = buildUrl(remotePath)
+                    val file = File(localPath)
+                    val fileSize = file.length()
+                    if (fileSize > 50 * 1024 * 1024L) {
+                        return@withContext err(AppError.Remote("WebDAV 上传: 文件过大 (${fileSize / 1024 / 1024}MB), 上限 50MB", "upload"))
                     }
-                    out.toByteArray()
-                }
-                sardine.put(url, data, "application/octet-stream")
-                onProgress(RemoteTransport.TransferProgress("completed", 1, 1, remotePath))
-                Result.success(Unit)
-            } catch (e: Exception) {
-                Log.e(TAG, "upload failed: $remotePath", e)
-                Result.failure(Exception("WebDAV upload failed: ${e.message}", e))
-            }
-        }
-
-    override suspend fun download(remotePath: String, localPath: String, onProgress: suspend (RemoteTransport.TransferProgress) -> Unit, onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit): Result<Unit> =
-        withContext(Dispatchers.IO) {
-            try {
-                val url = buildUrl(remotePath)
-                val localFile = File(localPath)
-                localFile.parentFile?.mkdirs()
-                onProgress(RemoteTransport.TransferProgress("connecting", 0, 1, remotePath))
-                sardine.get(url).use { input ->
-                    localFile.outputStream().use { output ->
+                    Log.d(TAG, "upload $localPath -> $url ($fileSize bytes)")
+                    onProgress(RemoteTransport.TransferProgress("connecting", 0, 1, remotePath))
+                    val data = file.inputStream().buffered(bufferSize).use { input ->
                         onProgress(RemoteTransport.TransferProgress("transferring", 0, 1, remotePath))
+                        val out = ByteArrayOutputStream()
                         val buffer = ByteArray(bufferSize)
                         var totalRead = 0L
                         var n = input.read(buffer)
                         while (n != -1) {
-                            output.write(buffer, 0, n)
+                            out.write(buffer, 0, n)
                             totalRead += n
-                            onByteProgress(RemoteTransport.ByteProgress(totalRead, 0, remotePath))
+                            onByteProgress(RemoteTransport.ByteProgress(totalRead, fileSize, remotePath))
                             n = input.read(buffer)
                         }
+                        out.toByteArray()
                     }
+                    sardine.put(url, data, "application/octet-stream")
+                    onProgress(RemoteTransport.TransferProgress("completed", 1, 1, remotePath))
+                    AppResult.Success(Unit)
+                } catch (e: CancellationException) {
+                    throw e
+                } catch (e: Exception) {
+                    Log.e(TAG, "upload failed: $remotePath", e)
+                    err(AppError.Remote("WebDAV 上传失败", "upload", cause = e))
                 }
-                onProgress(RemoteTransport.TransferProgress("completed", 1, 1, remotePath))
-                Log.d(TAG, "download $url -> $localPath (${localFile.length()} bytes)")
-                Result.success(Unit)
-            } catch (e: Exception) {
-                Log.e(TAG, "download failed: $remotePath", e)
-                Result.failure(Exception("WebDAV download failed: ${e.message}", e))
             }
         }
-    override suspend fun listFiles(remoteDir: String): Result<List<RemoteTransport.RemoteFileInfo>> =
+
+    override suspend fun download(remotePath: String, localPath: String, onProgress: suspend (RemoteTransport.TransferProgress) -> Unit, onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit): AppResult<Unit> =
+        retryWithBackoff(TAG, "WebDAV 下载") {
+            withContext(Dispatchers.IO) {
+                try {
+                    val url = buildUrl(remotePath)
+                    val localFile = File(localPath)
+                    localFile.parentFile?.mkdirs()
+                    val partFile = File(localPath + ".part")
+                    val existingBytes = if (partFile.exists()) partFile.length() else 0L
+
+                    onProgress(RemoteTransport.TransferProgress("connecting", 0, 1, remotePath))
+
+                    if (existingBytes > 0L) {
+                        Log.d(TAG, "download 发现 .part 文件, 从 offset=$existingBytes 续传: $remotePath")
+                        downloadRangeResume(url, partFile, existingBytes, onByteProgress, remotePath)
+                    } else {
+                        sardine.get(url).use { input ->
+                            partFile.outputStream().use { output ->
+                                onProgress(RemoteTransport.TransferProgress("transferring", 0, 1, remotePath))
+                                val buffer = ByteArray(bufferSize)
+                                var totalRead = 0L
+                                var n = input.read(buffer)
+                                while (n != -1) {
+                                    output.write(buffer, 0, n)
+                                    totalRead += n
+                                    onByteProgress(RemoteTransport.ByteProgress(totalRead, 0, remotePath))
+                                    n = input.read(buffer)
+                                }
+                            }
+                        }
+                    }
+
+                    if (partFile.exists()) {
+                        partFile.renameTo(localFile)
+                    }
+                    onProgress(RemoteTransport.TransferProgress("completed", 1, 1, remotePath))
+                    Log.d(TAG, "download $url -> $localPath (${localFile.length()} bytes)")
+                    AppResult.Success(Unit)
+                } catch (e: CancellationException) {
+                    throw e
+                } catch (e: Exception) {
+                    Log.e(TAG, "download failed: $remotePath", e)
+                    err(AppError.Remote("WebDAV 下载失败", "download", cause = e))
+                }
+            }
+        }   // retryWithBackoff
+
+    /**
+     * Resume a partial WebDAV download using HTTP Range header.
+     * Reads from [partFile] which already has [offset] bytes, requests remaining bytes via
+     * [HttpURLConnection] with Basic auth, and appends to the file.
+     */
+    private suspend fun downloadRangeResume(
+        url: String,
+        partFile: File,
+        offset: Long,
+        onByteProgress: suspend (RemoteTransport.ByteProgress) -> Unit,
+        remotePath: String
+    ) {
+        val conn = URL(url).openConnection() as HttpURLConnection
+        try {
+            conn.requestMethod = "GET"
+            if (username.isNotEmpty()) {
+                val basicAuth = "Basic " + Base64.encodeToString(
+                    "$username:$password".toByteArray(Charsets.UTF_8),
+                    Base64.NO_WRAP
+                )
+                conn.setRequestProperty("Authorization", basicAuth)
+            }
+            conn.setRequestProperty("Range", "bytes=$offset-")
+            conn.connect()
+
+            val statusCode = conn.responseCode
+            if (statusCode != 206 && statusCode != 200) {
+                throw IOException("WebDAV Range resume 失败: HTTP $statusCode (需要 206)")
+            }
+
+            val totalSize = offset + conn.contentLength
+            java.io.FileOutputStream(partFile, true).use { output ->
+                conn.inputStream.use { input ->
+                    val buffer = ByteArray(bufferSize)
+                    var totalRead = offset
+                    var n = input.read(buffer)
+                    while (n != -1) {
+                        output.write(buffer, 0, n)
+                        totalRead += n
+                        onByteProgress(RemoteTransport.ByteProgress(totalRead, totalSize, remotePath))
+                        n = input.read(buffer)
+                    }
+                }
+            }
+        } finally {
+            conn.disconnect()
+        }
+    }
+    override suspend fun listFiles(remoteDir: String): AppResult<List<RemoteTransport.RemoteFileInfo>> =
         withContext(Dispatchers.IO) {
             try {
                 val url = buildUrl(remoteDir)
@@ -116,7 +194,9 @@ class WebdavTransport(
                         isDirectory = it.isDirectory
                     ) }
                 Log.d(TAG, "listFiles $remoteDir -> ${entries.size} entries")
-                Result.success(entries)
+                AppResult.Success(entries)
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
                 // Only treat 404 as empty for non-root paths; the caller (listRemoteRecursive)
                 // handles the distinction. We propagate the error so the caller can decide.
@@ -124,14 +204,14 @@ class WebdavTransport(
                 if (is404) {
                     // Return a failure with a distinguishable marker so callers can check
                     Log.d(TAG, "listFiles $remoteDir -> 404 (not found)")
-                    return@withContext Result.failure(FileNotFoundException(remoteDir))
+                    return@withContext err(AppError.Remote("远端路径不存在", "list", isNotFound = true))
                 }
                 Log.e(TAG, "listFiles failed: $remoteDir", e)
-                Result.failure(Exception("WebDAV list failed: ${e.message}", e))
+                err(AppError.Remote("WebDAV 列表失败", "list", cause = e))
             }
         }
 
-    override suspend fun mkdirs(remotePath: String): Result<Unit> =
+    override suspend fun mkdirs(remotePath: String): AppResult<Unit> =
         withContext(Dispatchers.IO) {
             try {
                 val parts = remotePath.trimStart('/').split("/")
@@ -139,34 +219,55 @@ class WebdavTransport(
                 for (part in parts) {
                     current = if (current.isEmpty()) part else "$current/$part"
                     try { sardine.createDirectory(buildUrl(current)) }
-                    catch (_: Exception) { /* already exists or parent missing, continue */ }
+                    catch (_: Exception) { Log.w(TAG, "mkdirs: failed to create $current"); continue }
                 }
-                Result.success(Unit)
+                AppResult.Success(Unit)
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
-                Log.w(TAG, "mkdirs failed: $remotePath — ${e.message}")
-                Result.success(Unit)  // best-effort; upload will fail if dir can't be created
+                Log.e(TAG, "mkdirs failed: $remotePath — ${e.message}")
+                err(AppError.Remote("WebDAV mkdirs 失败", "mkdirs", cause = e))
             }
         }
 
-    override suspend fun delete(remotePath: String): Result<Unit> =
+    override suspend fun delete(remotePath: String): AppResult<Unit> =
         withContext(Dispatchers.IO) {
             try {
                 val url = buildUrl(remotePath)
                 sardine.delete(url)
-                Result.success(Unit)
+                AppResult.Success(Unit)
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
                 Log.w(TAG, "delete failed (ignoring): $remotePath — ${e.message}")
-                Result.success(Unit)
+                err(AppError.Remote("WebDAV 删除失败", "delete", cause = e))
             }
         }
 
-    override suspend fun exists(remotePath: String): Result<Boolean> =
+    override suspend fun exists(remotePath: String): AppResult<Boolean> =
         withContext(Dispatchers.IO) {
             try {
                 val result = sardine.exists(buildUrl(remotePath))
-                Result.success(result)
+                AppResult.Success(result)
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
-                Result.failure(Exception("WebDAV exists check failed: ${e.message}", e))
+                err(AppError.Remote("WebDAV 检查失败", "exists", cause = e))
+            }
+        }
+
+    override suspend fun fileSize(remotePath: String): AppResult<Long> =
+        withContext(Dispatchers.IO) {
+            try {
+                val url = buildUrl(remotePath)
+                if (!sardine.exists(url)) return@withContext err(AppError.Remote("文件不存在", "fileSize"))
+                val resources = sardine.list(url)
+                val size = resources.firstOrNull()?.contentLength ?: 0L
+                AppResult.Success(size)
+            } catch (e: CancellationException) {
+                throw e
+            } catch (e: Exception) {
+                err(AppError.Remote("WebDAV 获取文件大小失败", "fileSize", cause = e))
             }
         }
 }

app/src/main/java/com/example/androidbackupgui/root/RootShell.kt

@@ -3,6 +3,8 @@ package com.example.androidbackupgui.root
 import android.util.Log
 import com.topjohnwu.superuser.Shell
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ensureActive
+import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.TimeoutCancellationException
 import kotlinx.coroutines.withContext
 import kotlinx.coroutines.withTimeout
@@ -34,24 +36,51 @@ object RootShell {
     }
 
     /**
-     * Trigger root shell pre-initialization.
-     * Returns true if root is available.
-     * Note: Shell.cmd() also auto-initializes on first use, so this is optional.
+     * libsu shell initializer: enter global mount namespace via nsenter.
+     * Preserves the original PATH so that tar/zstd (from Termux etc.) remain accessible.
+     * Ref: DataBackup (XayahSuSuSu) uses the same nsenter pattern.
      */
+    private class GlobalNamespaceInitializer : Shell.Initializer() {
+        override fun onInit(context: android.content.Context, shell: Shell): Boolean {
+            shell.newJob()
+                .add("nsenter --mount=/proc/1/ns/mnt sh")
+                .add("set -o pipefail")
+                .exec()
+            return true
+        }
+    }
+
+    /** Call once at app startup to configure libsu. Safe to call multiple times. */
+    fun configure() {
+        Shell.enableVerboseLogging = true
+        try {
+            Shell.setDefaultBuilder(
+                Shell.Builder.create()
+                    .setFlags(Shell.FLAG_MOUNT_MASTER)
+                    .setInitializers(GlobalNamespaceInitializer::class.java)
+                    .setTimeout(30)
+            )
+        } catch (_: IllegalStateException) {
+            // Shell already created (e.g. from Application superclass or prior session).
+            // The default builder is already in effect — our custom config is ignored
+            // but the shell is still functional.
+        } catch (e: Exception) {
+            // Some ROMs throw other exceptions during root init; don't crash startup.
+            Log.w(TAG, "configure: failed to set default builder", e)
+        }
+    }
+
     suspend fun ensureSession(): Boolean = withContext(Dispatchers.IO) {
         try {
             Shell.getShell().isRoot
-        } catch (_: Exception) { false }
+        } catch (e: CancellationException) {
+            throw e
+        } catch (e: Exception) { false }
     }
 
-    /**
-     * Execute a shell command and return the result.
-     * libsu internally runs via `su`, compatible with Magisk/KernelSU/APatch.
-     * Commands are passed verbatim to `su -c`, so pipes and redirects work normally.
-     * Timeout is enforced via structured coroutine cancellation.
-     */
     suspend fun exec(command: String, timeoutMs: Long = COMMAND_TIMEOUT_MS): ShellResult =
         withContext(Dispatchers.IO) {
+            ensureActive()
             try {
                 val result = withTimeout(timeoutMs) {
                     Shell.cmd(command).exec()
@@ -64,9 +93,24 @@ object RootShell {
             } catch (e: TimeoutCancellationException) {
                 Log.w(TAG, "exec timeout (${timeoutMs}ms): $command")
                 ShellResult("", "Command timed out after ${timeoutMs}ms", -1)
+            } catch (e: CancellationException) {
+                throw e
             } catch (e: Exception) {
                 Log.e(TAG, "exec failed: $command", e)
                 ShellResult("", e.message ?: "Unknown error", -1)
             }
         }
+
+    /**
+     * 安全执行 root shell 命令，自动 shellEscape 每个参数。
+     * @param parts 命令和参数列表，第一个元素是命令本身
+     * @param timeoutMs 超时毫秒
+     */
+    suspend fun execSafe(
+        parts: List<String>,
+        timeoutMs: Long = COMMAND_TIMEOUT_MS
+    ): ShellResult = exec(
+        command = parts.joinToString(" ") { "'${it.shellEscape()}'" },
+        timeoutMs = timeoutMs
+    )
 }

app/src/main/java/com/example/androidbackupgui/ui/AppNavigation.kt

@@ -0,0 +1,9 @@
+package com.example.androidbackupgui.ui
+
+/** Navigation destinations */
+enum class Screen(val label: String, val icon: String) {
+    BACKUP("应用备份", "backup"),
+    RESTORE("应用恢复", "restore"),
+    CONFIG("备份配置", "settings"),
+    LOG("运行日志", "logs")
+}

app/src/main/java/com/example/androidbackupgui/ui/AppScaffold.kt

@@ -0,0 +1,69 @@
+package com.example.androidbackupgui.ui
+
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Cloud
+import androidx.compose.material.icons.filled.Description
+import androidx.compose.material.icons.filled.Restore
+import androidx.compose.material.icons.filled.Settings
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+
+private val navItems = listOf(
+    NavItem(Screen.BACKUP, Icons.Filled.Cloud, "备份"),
+    NavItem(Screen.RESTORE, Icons.Filled.Restore, "恢复"),
+    NavItem(Screen.LOG, Icons.Filled.Description, "日志"),
+    NavItem(Screen.CONFIG, Icons.Filled.Settings, "配置"),
+)
+
+private data class NavItem(
+    val screen: Screen,
+    val icon: ImageVector,
+    val label: String
+)
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun AppScaffold() {
+    var currentScreen by remember { mutableStateOf(Screen.CONFIG) }
+    val snackbarHostState = remember { SnackbarHostState() }
+
+    Scaffold(
+        snackbarHost = { SnackbarHost(snackbarHostState) },
+        topBar = {
+            TopAppBar(
+                title = { Text(currentScreen.label) },
+                colors = TopAppBarDefaults.topAppBarColors(
+                    containerColor = MaterialTheme.colorScheme.surface,
+                    titleContentColor = MaterialTheme.colorScheme.onSurface,
+                )
+            )
+        },
+        bottomBar = {
+            NavigationBar {
+                navItems.forEach { item ->
+                    NavigationBarItem(
+                        selected = currentScreen == item.screen,
+                        onClick = { currentScreen = item.screen },
+                        icon = { Icon(item.icon, contentDescription = item.label) },
+                        label = { Text(item.label) },
+                    )
+                }
+            }
+        }
+    ) { innerPadding ->
+        Surface(
+            modifier = Modifier.padding(innerPadding),
+            color = MaterialTheme.colorScheme.background
+        ) {
+            when (currentScreen) {
+                Screen.BACKUP -> BackupScreen()
+                Screen.RESTORE -> RestoreScreen()
+                Screen.LOG -> LogScreen()
+                Screen.CONFIG -> ConfigScreen(snackbarHostState = snackbarHostState)
+            }
+        }
+    }
+}

app/src/main/java/com/example/androidbackupgui/ui/BackupFragment.kt

@@ -1,220 +0,0 @@
-package com.example.androidbackupgui.ui
-
-import android.os.Bundle
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
-import androidx.fragment.app.Fragment
-import androidx.lifecycle.lifecycleScope
-import androidx.recyclerview.widget.LinearLayoutManager
-import com.example.androidbackupgui.backup.AppInfo
-import com.example.androidbackupgui.backup.AppScanner
-import com.example.androidbackupgui.backup.BackupConfig
-import com.example.androidbackupgui.backup.BackupOperation
-import com.example.androidbackupgui.backup.ResticBinary
-import com.example.androidbackupgui.backup.ResticWrapper
-import com.example.androidbackupgui.backup.WifiManager
-import com.example.androidbackupgui.backup.RemoteTransport
-import com.example.androidbackupgui.databinding.FragmentBackupBinding
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
-import java.io.File
-import java.util.Locale
-
-class BackupFragment : Fragment() {
-
-    private var _binding: FragmentBackupBinding? = null
-    private val binding get() = _binding!!
-    private var apps: List<AppInfo> = emptyList()
-    private var selectedApps = mutableSetOf<String>()
-    private lateinit var config: BackupConfig
-
-    override fun onCreateView(
-        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
-    ): View {
-        _binding = FragmentBackupBinding.inflate(inflater, container, false)
-        return binding.root
-    }
-
-    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        super.onViewCreated(view, savedInstanceState)
-
-        val configFile = File(requireContext().filesDir, "backup_settings.conf")
-        config = BackupConfig.fromFile(configFile)
-
-        binding.appList.layoutManager = LinearLayoutManager(requireContext())
-
-        binding.scanButton.setOnClickListener { scanApps() }
-        binding.backupButton.setOnClickListener { startBackup() }
-    }
-
-    override fun onResume() {
-        super.onResume()
-        // Re-read config so changes from ConfigFragment take effect immediately
-        val configFile = File(requireContext().filesDir, "backup_settings.conf")
-        config = BackupConfig.fromFile(configFile)
-    }
-
-    private fun scanApps() {
-        binding.backupButton.isEnabled = false
-        setRunning(true)
-        binding.statusText.text = "正在扫描应用…"
-
-        viewLifecycleOwner.lifecycleScope.launch {
-            val ctx = requireContext()
-            val thirdParty = AppScanner.scanThirdParty(ctx)
-            val system = AppScanner.scanSystem(ctx, config)
-            apps = thirdParty + system
-            selectedApps.clear()
-            selectedApps.addAll(apps.map { it.packageName })
-
-            binding.statusText.text = "共找到 ${apps.size} 个应用，全部已选中"
-            binding.backupButton.isEnabled = apps.isNotEmpty()
-            setRunning(false)
-
-            setupAppList()
-        }
-    }
-
-    private fun setupAppList() {
-        binding.appList.adapter = PackageListAdapter(apps, selectedApps) { pkg, checked ->
-            if (checked) selectedApps.add(pkg) else selectedApps.remove(pkg)
-            binding.statusText.text = "已选择 ${selectedApps.size}/${apps.size} 个应用"
-        }
-    }
-
-    private fun startBackup() {
-        val toBackup = apps.filter { it.packageName in selectedApps }
-        if (toBackup.isEmpty()) return
-
-        setRunning(true)
-        binding.backupButton.isEnabled = false
-        binding.scanButton.isEnabled = false
-
-        viewLifecycleOwner.lifecycleScope.launch {
-            val outputDir = File(config.outputPath.ifEmpty {
-                requireContext().filesDir.absolutePath
-            })
-            WifiManager.backup(outputDir)
-            val result = BackupOperation.backupApps(
-                apps = toBackup,
-                config = config,
-                outputDir = outputDir,
-                onProgress = { progress ->
-                    val label = toBackup.find { it.packageName == progress.packageName }?.label
-                    val name = label?.ifEmpty { progress.packageName } ?: progress.packageName
-                    binding.statusText.text =
-                        "[${progress.current}/${progress.total}] $name: ${progress.message}"
-                }
-            )
-
-            // If restic is enabled, snapshot the backup to a restic repository
-            var resticSummary: ResticWrapper.BackupSummary? = null
-            var resticError: String? = null
-            if (config.resticEnabled == 1 && config.resticRepo.isNotBlank()) {
-                val binaryPath = ResticBinary.prepare(requireContext())
-                if (binaryPath != null) {
-                    ResticWrapper.binaryPath = binaryPath
-                    ResticWrapper.tempRepoDir = ResticBinary.getTempRepoDir(requireContext())
-                    ResticWrapper.backendDomain = config.resticBackendDomain
-
-                    // For local repos, verify init before attempting backup
-                    if (config.resticBackend == "local") {
-                        if (!File(config.resticRepo, "config").exists()) {
-                            binding.statusText.text = "restic 本地仓库未初始化，请先在设置中初始化"
-                            setRunning(false)
-                            binding.scanButton.isEnabled = true
-                            return@launch
-                        }
-                    }
-                    binding.statusText.text = "正在写入 restic 去重仓库…"
-                    val resticResult = ResticWrapper.backup(
-                        repoPath = config.resticRepo,
-                        password = config.resticPassword,
-                        paths = listOf(result.outputDir),
-                        tags = listOf("backup_${System.currentTimeMillis() / 1000}"),
-                        hostname = "android-backup-gui",
-                        backend = config.resticBackend,
-                        backendUrl = config.resticBackendUrl,
-                        backendUser = config.resticBackendUser,
-                        backendPass = config.resticBackendPass,
-                        backendShare = config.resticBackendShare,
-                        onSyncProgress = { progress: RemoteTransport.TransferProgress ->
-                            withContext(Dispatchers.Main) {
-                                when (progress.phase) {
-                                    "list", "download", "upload", "delete_stale" ->
-                                        binding.statusText.text = "同步中: ${progress.current}/${progress.total} 个文件"
-                                }
-                            }
-                        },
-                        onByteSyncProgress = { progress ->
-                            withContext(Dispatchers.Main) {
-                                binding.progressBar.max = progress.totalBytes.toInt().coerceAtLeast(1)
-                                binding.progressBar.progress = progress.bytesTransferred.toInt()
-                                binding.statusText.text = "同步中: ${progress.currentFile}\n" +
-                                    "${formatSize(progress.bytesTransferred)} / ${formatSize(progress.totalBytes)}"
-                            }
-                        },
-                        onProgress = { progress ->
-                            if (progress.messageType == "status") {
-                                binding.statusText.text = "去重仓库: %.0f%% (%d/%d 个文件)".format(
-                                    progress.percentDone * 100,
-                                    progress.filesDone,
-                                    progress.totalFiles
-                                )
-                            }
-                        }
-                    )
-                    resticResult.fold(
-                        onSuccess = { resticSummary = it },
-                        onFailure = { e ->
-                            resticError = e.message
-                            binding.statusText.text = "restic 快照失败: ${e.message}"
-                        }
-                    )
-                }
-            }
-
-            binding.statusText.text = buildString {
-                appendLine("备份完成！")
-                appendLine("成功: ${result.successCount}  失败: ${result.failCount}")
-                appendLine("耗时: ${result.elapsedMs / 1000}秒")
-                appendLine("输出: ${result.outputDir}")
-                if (resticSummary != null) {
-                    appendLine()
-                    appendLine("── Restic 快照 ──")
-                    appendLine("ID: ${resticSummary!!.snapshotId.take(8)}…")
-                    appendLine("新增: ${resticSummary!!.dataAdded / 1024 / 1024} MB")
-                    appendLine("文件: ${resticSummary!!.totalFilesProcessed}")
-                } else if (resticError != null) {
-                    appendLine()
-                    appendLine("── Restic 错误 ──")
-                    appendLine(resticError!!)
-                }
-            }
-            setRunning(false)
-            binding.scanButton.isEnabled = true
-        }
-    }
-
-    private fun formatSize(bytes: Long): String {
-        if (bytes < 1024) return "$bytes B"
-        val units = arrayOf("KB", "MB", "GB", "TB")
-        val exp = (63 - bytes.countLeadingZeroBits()) / 10
-        val value = bytes.toDouble() / (1L shl (exp * 10))
-        return "%.1f %s".format(Locale.US, value, units[exp - 1].coerceAtMost(units.last()))
-    }
-
-    private fun setRunning(running: Boolean) {
-        binding.progressBar.visibility = if (running) View.VISIBLE else View.GONE
-    }
-
-    override fun onDestroyView() {
-        viewLifecycleOwner.lifecycleScope.launch(Dispatchers.IO) {
-            ResticWrapper.cleanup()
-        }
-        super.onDestroyView()
-        _binding = null
-    }
-}

app/src/main/java/com/example/androidbackupgui/ui/BackupScreen.kt

@@ -0,0 +1,161 @@
+package com.example.androidbackupgui.ui
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.SortByAlpha
+import androidx.compose.material.icons.filled.Storage
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.style.TextDecoration
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.example.androidbackupgui.backup.AppInfo
+
+/**
+ * 备份主页——应用选择、扫描和备份执行。
+ *
+ * 业务逻辑在 [BackupViewModel] 中，UI 只负责渲染和事件转发。
+ */
+@Composable
+fun BackupScreen(viewModel: BackupViewModel = viewModel()) {
+    val context = LocalContext.current
+    val state by viewModel.state.collectAsState()
+
+    LaunchedEffect(state.allApps, state.sortMode, state.showSystemApps) {
+        viewModel.applySortAndFilter()
+    }
+
+    Column(modifier = Modifier.fillMaxSize()) {
+        // ── Top controls card ──
+        Card(modifier = Modifier.fillMaxWidth().padding(12.dp)) {
+            Column(modifier = Modifier.padding(12.dp), verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                // Scan button
+                Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                    Button(
+                        onClick = { viewModel.scanApps(context) },
+                        enabled = !state.isScanning && !state.isRunning,
+                        modifier = Modifier.weight(1f),
+                    ) {
+                        if (state.isScanning) {
+                            CircularProgressIndicator(modifier = Modifier.size(16.dp))
+                            Spacer(Modifier.width(8.dp))
+                        }
+                        Text("扫描应用")
+                    }
+                }
+
+                // Sort/filter row
+                Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(4.dp)) {
+                    FilterChip(
+                        selected = state.sortMode == SortMode.NAME_ASC,
+                        onClick = { viewModel.setSortMode(SortMode.NAME_ASC) },
+                        label = { Text("A-Z") },
+                        leadingIcon = { Icon(Icons.Default.SortByAlpha, contentDescription = null, modifier = Modifier.size(16.dp)) },
+                    )
+                    FilterChip(
+                        selected = state.sortMode == SortMode.SIZE_DESC,
+                        onClick = { viewModel.setSortMode(SortMode.SIZE_DESC) },
+                        label = { Text("大小") },
+                        leadingIcon = { Icon(Icons.Default.Storage, contentDescription = null, modifier = Modifier.size(16.dp)) },
+                    )
+                    Spacer(Modifier.width(8.dp))
+                    TextButton(onClick = { viewModel.selectAll() }) { Text("全选") }
+                    TextButton(onClick = { viewModel.clearSelection() }) { Text("取消全选") }
+                }
+
+                // Show system switch
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text("显示系统应用", modifier = Modifier.weight(1f))
+                    Switch(checked = state.showSystemApps, onCheckedChange = { viewModel.toggleShowSystem() })
+                }
+            }
+        }
+
+        // ── Status ──
+        Text(
+            text = state.statusText,
+            style = MaterialTheme.typography.bodySmall,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.padding(horizontal = 12.dp, vertical = 4.dp),
+        )
+
+        // ── App list ──
+        LazyColumn(
+            modifier = Modifier.weight(1f).fillMaxWidth(),
+            contentPadding = PaddingValues(horizontal = 12.dp, vertical = 4.dp),
+            verticalArrangement = Arrangement.spacedBy(4.dp),
+        ) {
+            items(state.sortedApps, key = { it.packageName.value }) { app ->
+                AppListItem(
+                    app = app,
+                    isSelected = app.packageName.value in state.selectedApps,
+                    isDataExcluded = app.packageName.value in state.excludeDataFromBackup,
+                    onToggle = { checked -> viewModel.toggleApp(app.packageName.value, checked) },
+                    onExcludeDataToggle = { excluded -> viewModel.toggleExcludeData(app.packageName.value, excluded) },
+                )
+            }
+        }
+
+        // ── Bottom bar with backup button ──
+        Surface(modifier = Modifier.fillMaxWidth(), tonalElevation = 3.dp) {
+            Button(
+                onClick = { viewModel.executeBackup(context) },
+                enabled = !state.isRunning && state.selectedApps.isNotEmpty(),
+                modifier = Modifier.fillMaxWidth().padding(12.dp),
+            ) {
+                if (state.isRunning) {
+                    CircularProgressIndicator(modifier = Modifier.size(16.dp))
+                    Spacer(Modifier.width(8.dp))
+                }
+                Text("开始备份 (${state.selectedApps.size})")
+            }
+        }
+    }
+}
+
+@Composable
+private fun AppListItem(
+    app: AppInfo,
+    isSelected: Boolean,
+    isDataExcluded: Boolean,
+    onToggle: (Boolean) -> Unit,
+    onExcludeDataToggle: (Boolean) -> Unit,
+) {
+    Card(
+        onClick = { onToggle(!isSelected) },
+        modifier = Modifier.fillMaxWidth(),
+    ) {
+        Row(
+            modifier = Modifier.padding(12.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Checkbox(checked = isSelected, onCheckedChange = { onToggle(it) })
+            Spacer(Modifier.width(8.dp))
+            Column(modifier = Modifier.weight(1f)) {
+                Text(
+                    text = app.label.ifEmpty { app.packageName.value },
+                    style = MaterialTheme.typography.bodyLarge,
+                )
+                Text(
+                    text = app.packageName.value,
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+            if (isSelected) {
+                TextButton(onClick = { onExcludeDataToggle(!isDataExcluded) }) {
+                    Text(
+                        "数据",
+                        textDecoration = if (isDataExcluded) TextDecoration.LineThrough else TextDecoration.None,
+                        color = if (isDataExcluded) MaterialTheme.colorScheme.error else MaterialTheme.colorScheme.primary,
+                    )
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/example/androidbackupgui/ui/BackupViewModel.kt

@@ -0,0 +1,344 @@
+package com.example.androidbackupgui.ui
+
+import android.app.Application
+import android.content.Context
+import android.content.Intent
+import android.util.Log
+import androidx.compose.runtime.mutableStateOf
+import androidx.core.content.ContextCompat
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import com.example.androidbackupgui.backup.*
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.BackupService.Companion.ACTION_START_BACKUP
+import com.example.androidbackupgui.backup.BackupService.Companion.ACTION_STOP_BACKUP
+import com.example.androidbackupgui.backup.BackupService.Companion.EXTRA_STATUS_TEXT
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.util.Locale
+
+enum class SortMode { NAME_ASC, SIZE_DESC }
+
+/** Backup 界面的完整 UI 状态。 */
+data class BackupUiState(
+    val config: BackupConfig = BackupConfig(),
+    val allApps: List<AppInfo> = emptyList(),
+    val sortedApps: List<AppInfo> = emptyList(),
+    val selectedApps: Set<String> = emptySet(),
+    val excludeDataFromBackup: Set<String> = emptySet(),
+    val sortMode: SortMode = SortMode.NAME_ASC,
+    val showSystemApps: Boolean = false,
+    val statusText: String = "请先扫描应用",
+    val isRunning: Boolean = false,
+    val isScanning: Boolean = false,
+)
+
+/** 备份操作的一次性事件。 */
+sealed interface BackupEvent {
+    data class Error(
+        val message: String,
+    ) : BackupEvent
+
+    data class BackupCompleted(
+        val result: BackupOperation.BackupResult,
+    ) : BackupEvent
+}
+
+class BackupViewModel(
+    application: Application,
+) : AndroidViewModel(application) {
+    companion object {
+        private const val TAG = "BackupViewModel"
+    }
+
+    private val _state = MutableStateFlow(BackupUiState())
+    val state: StateFlow<BackupUiState> = _state.asStateFlow()
+
+    private var currentJob: Job? = null
+
+    init {
+        // 加载配置文件
+        val cfg = BackupConfig.fromFile(File(application.filesDir, "backup_settings.conf"))
+        _state.update { it.copy(config = cfg) }
+    }
+
+    // ── 应用列表排序/过滤 ──────────────────────────────
+
+    fun applySortAndFilter() {
+        val s = _state.value
+        val filtered = if (s.showSystemApps) s.allApps else s.allApps.filter { !it.isSystem }
+        val sorted =
+            when (s.sortMode) {
+                SortMode.NAME_ASC -> filtered.sortedBy { it.label.lowercase(Locale.US) }
+                SortMode.SIZE_DESC -> filtered.sortedByDescending { it.backupSize }
+            }
+        _state.update { it.copy(sortedApps = sorted) }
+    }
+
+    fun setSortMode(mode: SortMode) {
+        _state.update { it.copy(sortMode = mode) }
+        applySortAndFilter()
+    }
+
+    fun toggleShowSystem() {
+        _state.update { it.copy(showSystemApps = !it.showSystemApps) }
+        applySortAndFilter()
+    }
+
+    fun selectAll() {
+        val pkgs =
+            _state.value.sortedApps
+                .map { it.packageName.value }
+                .toSet()
+        _state.update { it.copy(selectedApps = pkgs) }
+    }
+
+    fun clearSelection() {
+        _state.update { it.copy(selectedApps = emptySet()) }
+    }
+
+    fun toggleApp(
+        packageName: String,
+        checked: Boolean,
+    ) {
+        _state.update { s ->
+            s.copy(selectedApps = if (checked) s.selectedApps + packageName else s.selectedApps - packageName)
+        }
+    }
+
+    fun toggleExcludeData(
+        packageName: String,
+        excluded: Boolean,
+    ) {
+        _state.update { s ->
+            s.copy(excludeDataFromBackup = if (excluded) s.excludeDataFromBackup + packageName else s.excludeDataFromBackup - packageName)
+        }
+    }
+
+    // ── 扫描应用 ────────────────────────────────────────
+
+    fun scanApps(context: Context) {
+        if (_state.value.isScanning) return
+        _state.update { it.copy(isScanning = true, statusText = "正在扫描应用…") }
+        val config = _state.value.config
+
+        currentJob =
+            viewModelScope.launch {
+                try {
+                    val userId = config.backupUserId
+                    val thirdParty = withContext(Dispatchers.IO) { AppScanner.scanThirdParty(context, userId = userId) }
+                    val system = withContext(Dispatchers.IO) { AppScanner.scanSystem(context, config, userId = userId) }
+                    val apps = if (_state.value.showSystemApps) thirdParty + system else thirdParty
+
+                    val allPkgNames = apps.map { it.packageName.value }.toSet()
+                    var excludeSet = emptySet<String>()
+
+                    val appListFile = File(context.filesDir, "appList.txt")
+                    if (appListFile.exists()) {
+                        val content = appListFile.readText()
+                        val parsed = AppScanner.parseAppList(content)
+                        val fromPrefix = parsed.filter { it.first in allPkgNames && !it.second }.map { it.first }.toSet()
+                        if (fromPrefix.isNotEmpty()) excludeSet = fromPrefix
+                    }
+
+                    _state.update {
+                        it.copy(
+                            allApps = apps,
+                            sortedApps = apps,
+                            selectedApps = allPkgNames,
+                            excludeDataFromBackup = excludeSet,
+                            statusText =
+                                if (excludeSet.isNotEmpty()) {
+                                    "共找到 ${apps.size} 个应用，${excludeSet.size} 个标记为仅APK"
+                                } else {
+                                    "共找到 ${apps.size} 个应用，全部已选中"
+                                },
+                            isScanning = false,
+                        )
+                    }
+                } catch (e: Exception) {
+                    _state.update { it.copy(statusText = "扫描应用失败: ${e.message}", isScanning = false) }
+                }
+            }
+    }
+
+    // ── 执行备份 ────────────────────────────────────────
+
+    fun executeBackup(context: Context) {
+        val s = _state.value
+        val toBackup = s.allApps.filter { it.packageName.value in s.selectedApps }
+        if (toBackup.isEmpty()) return
+
+        _state.update { it.copy(isRunning = true, statusText = "开始备份 ${toBackup.size} 个应用…") }
+
+        currentJob =
+            viewModelScope.launch {
+                try {
+                    // 1. 启动前台服务
+                    val serviceIntent =
+                        Intent(context, BackupService::class.java).apply {
+                            action = ACTION_START_BACKUP
+                            putExtra(EXTRA_STATUS_TEXT, "正在备份 ${toBackup.size} 个应用…")
+                        }
+                    try {
+                        ContextCompat.startForegroundService(context, serviceIntent)
+                    } catch (_: Exception) {
+                    }
+
+                    // 2. 执行备份
+                    val outputDir = File(s.config.outputPath.ifEmpty { context.filesDir.absolutePath })
+                    val backupResult =
+                        withContext(Dispatchers.IO) {
+                            BackupOperation.backupApps(
+                                context = context,
+                                apps = toBackup,
+                                config = s.config,
+                                outputDir = outputDir,
+                                userId = s.config.backupUserId.toString(),
+                                noDataBackup = s.excludeDataFromBackup,
+                                onProgress = { progress ->
+                                    _state.update {
+                                        it.copy(
+                                            statusText = "[${progress.current}/${progress.total}] ${progress.packageName}: ${progress.message}",
+                                        )
+                                    }
+                                },
+                            )
+                        }
+                    _state.update {
+                        it.copy(
+                            statusText = "备份完成！成功: ${backupResult.successCount} 失败: ${backupResult.failCount} 耗时: ${backupResult.elapsedMs / 1000}s",
+                        )
+                    }
+
+                    // 3. WiFi 备份
+                    if (s.config.backupWifi == 1) {
+                        WifiManager.backup(File(backupResult.outputDir))
+                    }
+
+                    // 4. Restic 上传
+                    if (s.config.resticEnabled == 1 && s.config.resticRepo.isNotBlank()) {
+                        executeResticBackup(context, toBackup, s, backupResult)
+                    }
+                } catch (e: Exception) {
+                    val hint =
+                        when {
+                            e.message?.contains("EPERM", ignoreCase = true) == true -> "写入备份目录被拒绝，请检查输出路径权限"
+                            e.message?.contains("EACCES", ignoreCase = true) == true -> "权限不足，请检查存储权限"
+                            else -> null
+                        }
+                    _state.update { it.copy(statusText = "备份异常: ${e.message}" + (hint?.let { " ($it)" } ?: "")) }
+                } finally {
+                    _state.update { it.copy(isRunning = false) }
+                    try {
+                        context.startService(Intent(context, BackupService::class.java).apply { action = ACTION_STOP_BACKUP })
+                    } catch (_: Exception) {
+                    }
+                }
+            }
+    }
+
+    private suspend fun executeResticBackup(
+        context: Context,
+        toBackup: List<AppInfo>,
+        s: BackupUiState,
+        backupResult: BackupOperation.BackupResult,
+    ) {
+        val binaryPath = ResticBinary.prepare(context) ?: return
+        defaultResticWrapper.binaryPath = binaryPath
+        defaultResticWrapper.cacheDir = context.cacheDir.absolutePath
+        defaultResticWrapper.backendDomain = s.config.resticBackendDomain
+        val password = PasswordManager.getResticPassword() ?: s.config.resticPassword.takeIf { it.isNotEmpty() } ?: ""
+        val backendPass = PasswordManager.getBackendPass() ?: s.config.resticBackendPass.takeIf { it.isNotEmpty() } ?: ""
+
+        if (s.config.useStreaming == 1) {
+            defaultResticWrapper
+                .backupStreaming(
+                    apps = toBackup,
+                    noDataBackup = s.excludeDataFromBackup,
+                    legacyApps = null,
+                    ownPackageName = context.packageName,
+                    userId = s.config.backupUserId.toString(),
+                    repoPath = s.config.resticRepo,
+                    password = password,
+                    tags = listOf("backup_${System.currentTimeMillis() / 1000}"),
+                    hostname = "android-backup-gui",
+                    backend = s.config.resticBackend,
+                    backendUrl = s.config.resticBackendUrl,
+                    backendUser = s.config.resticBackendUser,
+                    backendPass = backendPass,
+                    backendShare = s.config.resticBackendShare,
+                    onProgress = { msg -> _state.update { it.copy(statusText = msg) } },
+                ).let { result ->
+                    when (result) {
+                        is AppResult.Success -> {
+                            val summary = result.getOrNull()
+                            _state.update {
+                                it.copy(
+                                    statusText = "流式备份完成！ID: ${summary?.snapshotId?.take(
+                                        8,
+                                    )}… 新增: ${(summary?.dataAdded ?: 0) / 1024 / 1024} MB",
+                                )
+                            }
+                        }
+
+                        is AppResult.Failure -> {
+                            _state.update { it.copy(statusText = "流式备份失败: ${result.errorOrNull()?.message}") }
+                        }
+                    }
+                }
+        } else {
+            defaultResticWrapper
+                .backup(
+                    repoPath = s.config.resticRepo,
+                    password = password,
+                    paths = listOf(backupResult.outputDir),
+                    tags = listOf("backup_${System.currentTimeMillis() / 1000}"),
+                    hostname = "android-backup-gui",
+                    backend = s.config.resticBackend,
+                    backendUrl = s.config.resticBackendUrl,
+                    backendUser = s.config.resticBackendUser,
+                    backendPass = backendPass,
+                    backendShare = s.config.resticBackendShare,
+                    onProgress = { progress ->
+                        if (progress.messageType == "status") {
+                            _state.update {
+                                it.copy(
+                                    statusText =
+                                        "去重仓库: %.0f%% (%d/%d 个文件)".format(
+                                            progress.percentDone * 100,
+                                            progress.filesDone,
+                                            progress.totalFiles,
+                                        ),
+                                )
+                            }
+                        }
+                    },
+                ).let { result ->
+                    when (result) {
+                        is AppResult.Success -> {
+                            val summary = result.getOrNull()
+                            _state.update {
+                                it.copy(
+                                    statusText = "备份完成！Restic ID: ${summary?.snapshotId?.take(
+                                        8,
+                                    )}… 新增: ${(summary?.dataAdded ?: 0) / 1024 / 1024} MB",
+                                )
+                            }
+                        }
+
+                        is AppResult.Failure -> {
+                            _state.update { it.copy(statusText = "restic 快照失败: ${result.errorOrNull()?.message}") }
+                        }
+                    }
+                }
+        }
+    }
+}

app/src/main/java/com/example/androidbackupgui/ui/ConfigFragment.kt

@@ -1,215 +0,0 @@
-package com.example.androidbackupgui.ui
-
-import android.os.Bundle
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
-import androidx.core.widget.doAfterTextChanged
-import androidx.fragment.app.Fragment
-import androidx.fragment.app.viewModels
-import androidx.lifecycle.Lifecycle
-import androidx.lifecycle.lifecycleScope
-import androidx.lifecycle.repeatOnLifecycle
-import com.example.androidbackupgui.R
-import com.example.androidbackupgui.backup.BackupConfig
-import com.example.androidbackupgui.databinding.FragmentConfigBinding
-import kotlinx.coroutines.launch
-
-class ConfigFragment : Fragment() {
-
-    companion object { private const val TAG = "ConfigFragment" }
-
-    private var _binding: FragmentConfigBinding? = null
-    private val binding get() = _binding!!
-    private val vm: ConfigViewModel by viewModels()
-    private var formLoading = false
-
-    override fun onCreateView(
-        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
-    ): View {
-        _binding = FragmentConfigBinding.inflate(inflater, container, false)
-        return binding.root
-    }
-
-    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        super.onViewCreated(view, savedInstanceState)
-
-        // Load config from file into ViewModel state
-        vm.load()
-
-        // Populate form fields from initial state (prevents listener chain)
-        loadForm()
-
-        // ── Change listeners ─────────────────────────────────────────
-        binding.saveConfigButton.setOnClickListener { saveConfig() }
-        binding.resticBackendGroup.addOnButtonCheckedListener { _, _, _ ->
-            onBackendChanged(); refreshResticStatus()
-        }
-        binding.resticEnabledSwitch.setOnCheckedChangeListener { _, _ -> refreshResticStatus() }
-        binding.resticRepoEdit.doAfterTextChanged {
-            if (formLoading) return@doAfterTextChanged
-            onFormChanged()
-            refreshResticStatus()
-        }
-        binding.resticBackendUrlEdit.doAfterTextChanged {
-            if (formLoading) return@doAfterTextChanged
-            onFormChanged()
-        }
-        binding.resticPasswordEdit.doAfterTextChanged {
-            if (formLoading) return@doAfterTextChanged
-            refreshResticStatus()
-        }
-        binding.initResticButton.setOnClickListener { initResticRepo() }
-        binding.resticStatsButton.setOnClickListener { showResticStats() }
-        binding.resticPruneButton.setOnClickListener { pruneResticSnapshots() }
-
-        // Initial async status check
-        refreshResticStatus()
-
-        // Observe ViewModel state for derived UI updates
-        viewLifecycleOwner.lifecycleScope.launch {
-            viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
-                vm.uiState.collect { state -> applyState(state) }
-            }
-        }
-    }
-
-    // ── Initial form population ──────────────────────────────────────
-
-    /** Populate EditTexts from ViewModel's current config. */
-    private fun loadForm() {
-        formLoading = true
-        val config = vm.uiState.value.config
-        binding.backupModeSwitch.isChecked = config.backupMode == 1
-        binding.backupUserDataSwitch.isChecked = config.backupUserData == 1
-        binding.backupObbSwitch.isChecked = config.backupObbData == 1
-        binding.backupWifiSwitch.isChecked = config.backupWifi == 1
-        binding.ignoreRunningSwitch.isChecked = config.backgroundAppsIgnore == 1
-        binding.outputPathEdit.setText(config.outputPath)
-        binding.compressionEdit.setText(config.compressionMethod)
-
-        binding.resticEnabledSwitch.isChecked = config.resticEnabled == 1
-        binding.resticRepoEdit.setText(config.resticRepo)
-        binding.resticPasswordEdit.setText(config.resticPassword)
-        binding.resticBackendUrlEdit.setText(config.resticBackendUrl)
-        binding.resticBackendUserEdit.setText(config.resticBackendUser)
-        binding.resticBackendPassEdit.setText(config.resticBackendPass)
-        binding.resticBackendShareEdit.setText(config.resticBackendShare)
-        binding.resticBackendDomainEdit.setText(config.resticBackendDomain)
-
-        binding.resticBackendGroup.check(
-            when (config.resticBackend) {
-                "webdav" -> R.id.resticBackendWebdav
-                "smb" -> R.id.resticBackendSmb
-                "rest-server" -> R.id.resticBackendRestServer
-                else -> R.id.resticBackendLocal
-            }
-        )
-        formLoading = false
-    }
-
-    // ── StateFlow observer ───────────────────────────────────────────
-
-    /** Apply ViewModel state to non-form views (visibility, text, enabled). */
-    private fun applyState(state: ConfigUiState) {
-        with(state.backendDisplay) {
-            binding.resticBackendUrlLayout.visibility = if (isRemote) View.VISIBLE else View.GONE
-            binding.resticBackendShareLayout.visibility = if (isSmb) View.VISIBLE else View.GONE
-            binding.resticBackendDomainLayout.visibility = if (isSmb) View.VISIBLE else View.GONE
-            binding.resticBackendUserLayout.visibility = if (needsAuth) View.VISIBLE else View.GONE
-            binding.resticBackendPassLayout.visibility = if (needsAuth) View.VISIBLE else View.GONE
-            binding.resticBackendUrlLayout.hint = urlHint
-            binding.resticComputedUrlText.text = if (state.config.resticRepo.isNotEmpty())
-                "实际仓库: $computedUrl" else ""
-        }
-        with(state.resticStatus) {
-            binding.resticStatusText.text = message
-            binding.initResticButton.isEnabled = initButtonEnabled
-            binding.initResticButton.visibility = if (initButtonVisible) View.VISIBLE else View.GONE
-            binding.resticStatsButton.isEnabled = statsButtonEnabled
-            binding.resticStatsButton.visibility = if (statsButtonVisible) View.VISIBLE else View.GONE
-            binding.resticPruneButton.isEnabled = pruneButtonEnabled
-            binding.resticPruneButton.visibility = if (pruneButtonVisible) View.VISIBLE else View.GONE
-        }
-    }
-
-    // ── Form building helpers ────────────────────────────────────────
-
-    private fun readBackend(): String = when (binding.resticBackendGroup.checkedButtonId) {
-        R.id.resticBackendWebdav -> "webdav"
-        R.id.resticBackendSmb -> "smb"
-        R.id.resticBackendRestServer -> "rest-server"
-        else -> "local"
-    }
-
-    private fun readResticForm() = ResticForm(
-        repo = binding.resticRepoEdit.text?.toString()?.trim() ?: "",
-        password = binding.resticPasswordEdit.text?.toString() ?: "",
-        backend = readBackend(),
-        backendUrl = binding.resticBackendUrlEdit.text?.toString()?.trim() ?: "",
-        backendUser = binding.resticBackendUserEdit.text?.toString()?.trim() ?: "",
-        backendPass = binding.resticBackendPassEdit.text?.toString() ?: "",
-        backendShare = binding.resticBackendShareEdit.text?.toString()?.trim() ?: "",
-        backendDomain = binding.resticBackendDomainEdit.text?.toString()?.trim() ?: ""
-    )
-
-    // ── User actions ─────────────────────────────────────────────────
-
-    private fun saveConfig() {
-        vm.save(BackupConfig().also { config ->
-            config.backupMode = if (binding.backupModeSwitch.isChecked) 1 else 0
-            config.backupUserData = if (binding.backupUserDataSwitch.isChecked) 1 else 0
-            config.backupObbData = if (binding.backupObbSwitch.isChecked) 1 else 0
-            config.backgroundAppsIgnore = if (binding.ignoreRunningSwitch.isChecked) 1 else 0
-            config.outputPath = binding.outputPathEdit.text?.toString() ?: ""
-            config.compressionMethod = binding.compressionEdit.text?.toString()?.ifEmpty { "zstd" } ?: "zstd"
-            config.backupWifi = if (binding.backupWifiSwitch.isChecked) 1 else 0
-
-            config.resticEnabled = if (binding.resticEnabledSwitch.isChecked) 1 else 0
-            config.resticRepo = binding.resticRepoEdit.text?.toString()?.trim() ?: ""
-            config.resticPassword = binding.resticPasswordEdit.text?.toString() ?: ""
-            config.resticBackend = readBackend()
-            config.resticBackendUrl = binding.resticBackendUrlEdit.text?.toString()?.trim() ?: ""
-            config.resticBackendUser = binding.resticBackendUserEdit.text?.toString()?.trim() ?: ""
-            config.resticBackendPass = binding.resticBackendPassEdit.text?.toString() ?: ""
-            config.resticBackendShare = binding.resticBackendShareEdit.text?.toString()?.trim() ?: ""
-            config.resticBackendDomain = binding.resticBackendDomainEdit.text?.toString()?.trim() ?: ""
-        })
-    }
-
-    private fun onFormChanged() {
-        val backend = readBackend()
-        val repo = binding.resticRepoEdit.text?.toString()?.trim() ?: ""
-        val url = binding.resticBackendUrlEdit.text?.toString()?.trim() ?: ""
-        vm.onFormChanged(backend, repo, url)
-    }
-
-    private fun onBackendChanged() {
-        val backend = readBackend()
-        val repo = binding.resticRepoEdit.text?.toString()?.trim() ?: ""
-        val url = binding.resticBackendUrlEdit.text?.toString()?.trim() ?: ""
-        vm.onFormChanged(backend, repo, url)
-    }
-
-    private fun refreshResticStatus() {
-        vm.refreshResticStatus(readResticForm())
-    }
-
-    private fun initResticRepo() {
-        vm.initResticRepo(readResticForm())
-    }
-
-    private fun showResticStats() {
-        vm.showResticStats(readResticForm())
-    }
-
-    private fun pruneResticSnapshots() {
-        vm.pruneResticSnapshots(readResticForm())
-    }
-
-    override fun onDestroyView() {
-        super.onDestroyView()
-        _binding = null
-        // cleanup is handled by ViewModel.onCleared()
-    }
-}

app/src/main/java/com/example/androidbackupgui/ui/ConfigScreen.kt

@@ -0,0 +1,615 @@
+package com.example.androidbackupgui.ui
+
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.selection.selectable
+import androidx.compose.foundation.selection.selectableGroup
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.FileUpload
+import androidx.compose.material.icons.filled.Save
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.semantics.Role
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.example.androidbackupgui.backup.AppScanner
+import com.example.androidbackupgui.backup.BackupConfig
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun ConfigScreen(
+    viewModel: ConfigViewModel = viewModel(),
+    snackbarHostState: SnackbarHostState = remember { SnackbarHostState() },
+) {
+    val uiState by viewModel.uiState.collectAsStateWithLifecycle()
+
+    val config = uiState.config
+    val backendDisplay = uiState.backendDisplay
+    val status = uiState.resticStatus
+
+    // ── Local editing state (initialized from ViewModel on first load) ──
+    var backupMode by remember { mutableStateOf(config.backupMode == 1) }
+    var backupUserData by remember { mutableStateOf(config.backupUserData == 1) }
+    var backupObb by remember { mutableStateOf(config.backupObbData == 1) }
+    var backupWifi by remember { mutableStateOf(config.backupWifi == 1) }
+    var ignoreRunning by remember { mutableStateOf(config.backgroundAppsIgnore == 1) }
+    var outputPath by remember { mutableStateOf(config.outputPath) }
+    var compressionMethod by remember { mutableStateOf(config.compressionMethod) }
+
+    var backupUserId by remember { mutableIntStateOf(config.backupUserId) }
+    var userList by remember { mutableStateOf<List<Pair<Int, String>>>(listOf(0 to "Owner")) }
+
+    var resticEnabled by remember { mutableStateOf(config.resticEnabled == 1) }
+    var resticRepo by remember { mutableStateOf(config.resticRepo) }
+    var resticPassword by remember { mutableStateOf(config.resticPassword) }
+    var resticBackend by remember { mutableStateOf(config.resticBackend) }
+    var resticBackendUrl by remember { mutableStateOf(config.resticBackendUrl) }
+    var resticBackendUser by remember { mutableStateOf(config.resticBackendUser) }
+    var resticBackendPass by remember { mutableStateOf(config.resticBackendPass) }
+    var resticBackendShare by remember { mutableStateOf(config.resticBackendShare) }
+    var resticBackendDomain by remember { mutableStateOf(config.resticBackendDomain) }
+    var streamingEnabled by remember { mutableStateOf(config.useStreaming == 1) }
+
+    // Sync local state from ViewModel when config reloads
+    LaunchedEffect(config) {
+        backupMode = config.backupMode == 1
+        backupUserData = config.backupUserData == 1
+        backupObb = config.backupObbData == 1
+        backupWifi = config.backupWifi == 1
+        ignoreRunning = config.backgroundAppsIgnore == 1
+        outputPath = config.outputPath
+        compressionMethod = config.compressionMethod
+        backupUserId = config.backupUserId
+        resticEnabled = config.resticEnabled == 1
+        resticRepo = config.resticRepo
+        resticPassword = config.resticPassword
+        resticBackend = config.resticBackend
+        resticBackendUrl = config.resticBackendUrl
+        resticBackendUser = config.resticBackendUser
+        resticBackendPass = config.resticBackendPass
+        resticBackendShare = config.resticBackendShare
+        resticBackendDomain = config.resticBackendDomain
+        streamingEnabled = config.useStreaming == 1
+    }
+
+    // Load user list for backup user selector
+    LaunchedEffect(Unit) {
+        val users =
+            withContext(Dispatchers.IO) {
+                AppScanner.enumerateUsers()
+            }
+        userList = users
+    }
+
+    // Observe one-shot events → show Snackbar feedback
+    LaunchedEffect(snackbarHostState) {
+        viewModel.operationEvents.collect { event ->
+            val msg =
+                when (event) {
+                    is OperationEvent.InitCompleted -> "仓库初始化完成"
+                    is OperationEvent.InitFailed -> "仓库初始化失败"
+                    is OperationEvent.StatsCompleted -> "统计读取完成"
+                    is OperationEvent.PruneStarted -> "正在清理快照…"
+                    is OperationEvent.PruneCompleted -> "清理完成"
+                    is OperationEvent.PruneFailed -> "清理失败"
+                    is OperationEvent.ConfigExported -> "配置已导出"
+                    is OperationEvent.ConfigExportFailed -> "配置导出失败"
+                    is OperationEvent.ConfigImported -> "配置已导入"
+                    is OperationEvent.ConfigImportFailed -> "配置导入失败"
+                    else -> null
+                }
+            if (msg != null) {
+                snackbarHostState.showSnackbar(msg)
+            }
+        }
+    }
+
+    val scrollState = rememberScrollState()
+
+    // SAF launcher: create a .conf document at a user-chosen location, then export.
+    val exportLauncher =
+        rememberLauncherForActivityResult(
+            contract = ActivityResultContracts.CreateDocument("text/plain"),
+        ) { uri ->
+            if (uri != null) viewModel.exportConfig(uri)
+        }
+
+    // SAF launcher: pick a .conf file to import.
+    val importLauncher =
+        rememberLauncherForActivityResult(
+            contract = ActivityResultContracts.OpenDocument(),
+        ) { uri ->
+            if (uri != null) viewModel.importConfig(uri)
+        }
+
+    // SAF directory picker for output path
+    val dirPickerLauncher =
+        rememberLauncherForActivityResult(
+            contract = ActivityResultContracts.OpenDocumentTree(),
+        ) { uri ->
+            if (uri != null) {
+                val resolvedPath = resolveSafTreeUri(uri)
+                if (resolvedPath != null) {
+                    outputPath = resolvedPath
+                }
+            }
+        }
+
+    Column(
+        modifier =
+            Modifier
+                .fillMaxSize()
+                .verticalScroll(scrollState)
+                .padding(16.dp),
+        verticalArrangement = Arrangement.spacedBy(16.dp),
+    ) {
+        // ── Backup settings section ──
+        Text("备份设置", style = MaterialTheme.typography.titleMedium)
+        Card(modifier = Modifier.fillMaxWidth()) {
+            Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(12.dp)) {
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text("备份模式", modifier = Modifier.weight(1f))
+                    Switch(checked = backupMode, onCheckedChange = { backupMode = it })
+                }
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text("备份用户数据", modifier = Modifier.weight(1f))
+                    Switch(checked = backupUserData, onCheckedChange = { backupUserData = it })
+                }
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text("备份 OBB 数据", modifier = Modifier.weight(1f))
+                    Switch(checked = backupObb, onCheckedChange = { backupObb = it })
+                }
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text("备份 WiFi 配置", modifier = Modifier.weight(1f))
+                    Switch(checked = backupWifi, onCheckedChange = { backupWifi = it })
+                }
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text("忽略运行中的应用", modifier = Modifier.weight(1f))
+                    Switch(checked = ignoreRunning, onCheckedChange = { ignoreRunning = it })
+                }
+                Row(verticalAlignment = Alignment.CenterVertically, modifier = Modifier.fillMaxWidth()) {
+                    OutlinedTextField(
+                        value = outputPath,
+                        onValueChange = { outputPath = it },
+                        label = { Text("输出目录") },
+                        modifier = Modifier.weight(1f),
+                        singleLine = true,
+                    )
+                    Spacer(Modifier.width(8.dp))
+                    Button(
+                        onClick = { dirPickerLauncher.launch(null) },
+                        modifier = Modifier.height(56.dp),
+                    ) {
+                        Text("选择")
+                    }
+                }
+                OutlinedTextField(
+                    value = compressionMethod,
+                    onValueChange = { compressionMethod = it },
+                    label = { Text("压缩方式 (tar / zstd)") },
+                    modifier = Modifier.fillMaxWidth(),
+                    singleLine = true,
+                )
+
+                // Backup user selector
+                UserSelector(
+                    userList = userList,
+                    selectedUserId = backupUserId,
+                    onUserSelected = { backupUserId = it },
+                )
+            }
+        }
+
+        // ── Restic section ──
+        HorizontalDivider()
+        Text("Restic 备份", style = MaterialTheme.typography.titleMedium)
+        Card(modifier = Modifier.fillMaxWidth()) {
+            Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(12.dp)) {
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text("启用 Restic", modifier = Modifier.weight(1f))
+                    Switch(checked = resticEnabled, onCheckedChange = { resticEnabled = it })
+                }
+
+                if (resticEnabled) {
+                    OutlinedTextField(
+                        value = resticRepo,
+                        onValueChange = {
+                            resticRepo = it
+                            viewModel.onFormChanged(resticBackend, it, resticBackendUrl)
+                        },
+                        label = { Text("仓库路径") },
+                        modifier = Modifier.fillMaxWidth(),
+                        singleLine = true,
+                    )
+                    OutlinedTextField(
+                        value = resticPassword,
+                        onValueChange = { resticPassword = it },
+                        label = { Text("仓库密码") },
+                        modifier = Modifier.fillMaxWidth(),
+                        singleLine = true,
+                        visualTransformation =
+                            androidx.compose.ui.text.input
+                                .PasswordVisualTransformation(),
+                    )
+
+                    // Backend selection radio group
+                    Text("后端类型", style = MaterialTheme.typography.labelLarge)
+                    val backends = listOf("local" to "本地", "webdav" to "WebDAV", "smb" to "SMB", "rest-server" to "rest-server")
+                    Column(modifier = Modifier.selectableGroup()) {
+                        backends.forEach { (value, label) ->
+                            Row(
+                                modifier =
+                                    Modifier
+                                        .fillMaxWidth()
+                                        .selectable(
+                                            selected = resticBackend == value,
+                                            onClick = {
+                                                resticBackend = value
+                                                viewModel.onFormChanged(value, resticRepo, resticBackendUrl)
+                                            },
+                                            role = Role.RadioButton,
+                                        ).padding(vertical = 4.dp),
+                                verticalAlignment = Alignment.CenterVertically,
+                            ) {
+                                RadioButton(
+                                    selected = resticBackend == value,
+                                    onClick = null,
+                                )
+                                Spacer(Modifier.width(8.dp))
+                                Text(label)
+                            }
+                        }
+                    }
+
+                    // Computed URL
+                    if (resticRepo.isNotEmpty()) {
+                        Text(
+                            text = "实际仓库: ${backendDisplay.computedUrl}",
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    }
+                    // Remote-specific fields
+                    if (resticBackend != "local") {
+                        OutlinedTextField(
+                            value = resticBackendUrl,
+                            onValueChange = {
+                                resticBackendUrl = it
+                                viewModel.onFormChanged(resticBackend, resticRepo, it)
+                            },
+                            label = { Text(backendDisplay.urlHint.ifEmpty { "后端地址" }) },
+                            modifier = Modifier.fillMaxWidth(),
+                            singleLine = true,
+                        )
+                    }
+                    if (resticBackend == "webdav" || resticBackend == "smb") {
+                        OutlinedTextField(
+                            value = resticBackendUser,
+                            onValueChange = { resticBackendUser = it },
+                            label = { Text("用户名") },
+                            modifier = Modifier.fillMaxWidth(),
+                            singleLine = true,
+                        )
+                        OutlinedTextField(
+                            value = resticBackendPass,
+                            onValueChange = { resticBackendPass = it },
+                            label = { Text("密码") },
+                            modifier = Modifier.fillMaxWidth(),
+                            singleLine = true,
+                            visualTransformation =
+                                androidx.compose.ui.text.input
+                                    .PasswordVisualTransformation(),
+                        )
+                    }
+                    if (resticBackend == "smb") {
+                        OutlinedTextField(
+                            value = resticBackendShare,
+                            onValueChange = { resticBackendShare = it },
+                            label = { Text("SMB 共享名称") },
+                            modifier = Modifier.fillMaxWidth(),
+                            singleLine = true,
+                        )
+                        OutlinedTextField(
+                            value = resticBackendDomain,
+                            onValueChange = { resticBackendDomain = it },
+                            label = { Text("SMB 域 (可选)") },
+                            modifier = Modifier.fillMaxWidth(),
+                            singleLine = true,
+                        )
+                    }
+
+                    // ── Streaming backup toggle ──
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
+                        verticalAlignment = Alignment.CenterVertically,
+                    ) {
+                        Text(
+                            "流式备份 (FIFO管道 → restic --stdin)",
+                            modifier = Modifier.weight(1f),
+                            style = MaterialTheme.typography.bodyMedium,
+                        )
+                        Switch(
+                            checked = streamingEnabled,
+                            onCheckedChange = { streamingEnabled = it },
+                        )
+                    }
+
+                    Spacer(Modifier.height(8.dp))
+
+                    // Status & action buttons
+                    Card(
+                        colors =
+                            CardDefaults.cardColors(
+                                containerColor = MaterialTheme.colorScheme.surfaceVariant,
+                            ),
+                        modifier = Modifier.fillMaxWidth(),
+                    ) {
+                        Column(modifier = Modifier.padding(12.dp)) {
+                            Text(
+                                text = status.message,
+                                style = MaterialTheme.typography.bodyMedium,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+
+                            Spacer(Modifier.height(8.dp))
+
+                            if (status.initButtonVisible) {
+                                Button(
+                                    onClick = {
+                                        viewModel.initResticRepo(
+                                            buildResticForm(
+                                                resticRepo,
+                                                resticPassword,
+                                                resticBackend,
+                                                resticBackendUrl,
+                                                resticBackendUser,
+                                                resticBackendPass,
+                                                resticBackendShare,
+                                                resticBackendDomain,
+                                            ),
+                                        )
+                                    },
+                                    enabled = status.initButtonEnabled,
+                                    modifier = Modifier.fillMaxWidth(),
+                                ) {
+                                    Text("初始化仓库")
+                                }
+                            }
+
+                            if (status.statsButtonVisible) {
+                                Button(
+                                    onClick = {
+                                        viewModel.showResticStats(
+                                            buildResticForm(
+                                                resticRepo,
+                                                resticPassword,
+                                                resticBackend,
+                                                resticBackendUrl,
+                                                resticBackendUser,
+                                                resticBackendPass,
+                                                resticBackendShare,
+                                                resticBackendDomain,
+                                            ),
+                                        )
+                                    },
+                                    enabled = status.statsButtonEnabled,
+                                    modifier = Modifier.fillMaxWidth(),
+                                ) {
+                                    Text("仓库统计")
+                                }
+                            }
+
+                            if (status.pruneButtonVisible) {
+                                OutlinedButton(
+                                    onClick = {
+                                        viewModel.pruneResticSnapshots(
+                                            buildResticForm(
+                                                resticRepo,
+                                                resticPassword,
+                                                resticBackend,
+                                                resticBackendUrl,
+                                                resticBackendUser,
+                                                resticBackendPass,
+                                                resticBackendShare,
+                                                resticBackendDomain,
+                                            ),
+                                        )
+                                    },
+                                    enabled = status.pruneButtonEnabled,
+                                    modifier = Modifier.fillMaxWidth(),
+                                ) {
+                                    Text("清理旧快照")
+                                }
+                            }
+
+                            if (status.unlockButtonVisible) {
+                                Button(
+                                    onClick = {
+                                        viewModel.unlockResticRepo(
+                                            buildResticForm(
+                                                resticRepo,
+                                                resticPassword,
+                                                resticBackend,
+                                                resticBackendUrl,
+                                                resticBackendUser,
+                                                resticBackendPass,
+                                                resticBackendShare,
+                                                resticBackendDomain,
+                                            ),
+                                        )
+                                    },
+                                    enabled = status.unlockButtonEnabled,
+                                    modifier = Modifier.fillMaxWidth(),
+                                    colors =
+                                        ButtonDefaults.buttonColors(
+                                            containerColor = MaterialTheme.colorScheme.tertiary,
+                                        ),
+                                ) {
+                                    Text("解锁仓库")
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        Spacer(Modifier.height(8.dp))
+
+        // ── Save button ──
+        Button(
+            onClick = {
+                viewModel.save(
+                    BackupConfig(
+                        backupMode = if (backupMode) 1 else 0,
+                        backupUserData = if (backupUserData) 1 else 0,
+                        backupObbData = if (backupObb) 1 else 0,
+                        backupWifi = if (backupWifi) 1 else 0,
+                        backgroundAppsIgnore = if (ignoreRunning) 1 else 0,
+                        backupUserId = backupUserId,
+                        outputPath = outputPath,
+                        compressionMethod = compressionMethod.ifEmpty { "zstd" },
+                        resticEnabled = if (resticEnabled) 1 else 0,
+                        resticRepo = resticRepo,
+                        resticPassword = resticPassword,
+                        resticBackend = resticBackend,
+                        resticBackendUrl = resticBackendUrl,
+                        resticBackendUser = resticBackendUser,
+                        resticBackendPass = resticBackendPass,
+                        resticBackendShare = resticBackendShare,
+                        resticBackendDomain = resticBackendDomain,
+                        useStreaming = if (streamingEnabled) 1 else 0,
+                    ),
+                )
+            },
+            modifier = Modifier.fillMaxWidth(),
+        ) {
+            Icon(Icons.Filled.Save, contentDescription = null)
+            Spacer(Modifier.width(8.dp))
+            Text("保存配置")
+        }
+
+        // ── Import / Export config buttons ──
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.spacedBy(8.dp),
+        ) {
+            OutlinedButton(
+                onClick = { importLauncher.launch(arrayOf("text/plain", "*/*")) },
+                modifier = Modifier.weight(1f),
+            ) {
+                Text("导入配置")
+            }
+            OutlinedButton(
+                onClick = { exportLauncher.launch("backup_settings.conf") },
+                modifier = Modifier.weight(1f),
+            ) {
+                Icon(Icons.Filled.FileUpload, contentDescription = null)
+                Spacer(Modifier.width(8.dp))
+                Text("导出配置")
+            }
+        }
+        if (resticEnabled && resticPassword.isNotEmpty()) {
+            Text(
+                text = "注意：导出的配置包含明文 Restic 密码，请妥善保管导出的文件。",
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.error,
+            )
+        }
+
+        Spacer(Modifier.height(32.dp))
+    }
+}
+
+// ── User selector ──
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun UserSelector(
+    userList: List<Pair<Int, String>>,
+    selectedUserId: Int,
+    onUserSelected: (Int) -> Unit,
+) {
+    var expanded by remember { mutableStateOf(false) }
+    val selectedName =
+        userList.find { it.first == selectedUserId }?.let {
+            "${it.second} (ID: ${it.first})"
+        } ?: "Owner (ID: 0)"
+
+    ExposedDropdownMenuBox(expanded = expanded, onExpandedChange = { expanded = it }) {
+        OutlinedTextField(
+            value = selectedName,
+            onValueChange = {},
+            readOnly = true,
+            label = { Text("备份用户") },
+            trailingIcon = { ExposedDropdownMenuDefaults.TrailingIcon(expanded = expanded) },
+            modifier = Modifier.menuAnchor().fillMaxWidth(),
+            singleLine = true,
+        )
+        ExposedDropdownMenu(expanded = expanded, onDismissRequest = { expanded = false }) {
+            userList.forEach { (id, name) ->
+                DropdownMenuItem(
+                    text = { Text("$name (ID: $id)") },
+                    onClick = {
+                        onUserSelected(id)
+                        expanded = false
+                    },
+                )
+            }
+        }
+    }
+}
+
+/** Build a [ResticForm] from current input values (matches ConfigFragment's readResticForm). */
+private fun buildResticForm(
+    repo: String,
+    password: String,
+    backend: String,
+    backendUrl: String,
+    backendUser: String,
+    backendPass: String,
+    backendShare: String,
+    backendDomain: String,
+) = ResticForm(
+    repo = repo,
+    password = password,
+    backend = backend,
+    backendUrl = backendUrl,
+    backendUser = backendUser,
+    backendPass = backendPass,
+    backendShare = backendShare,
+    backendDomain = backendDomain,
+)
+
+/**
+ * 将 SAF OpenDocumentTree 的 content:// URI 转换为可用的文件系统路径。
+ * SAF URI 示例: content://com.android.externalstorage.documents/tree/primary%3ADownload%2FBackup
+ * 返回: /storage/emulated/0/Download/Backup
+ */
+private fun resolveSafTreeUri(uri: android.net.Uri): String? {
+    // SAF tree URI 格式:
+    //   content://com.android.externalstorage.documents/tree/primary%3ADownload%2FBackup
+    // lastPathSegment = primary%3ADownload%2FBackup 或 XXXX-XXXX%3Apath
+    val docId = uri.lastPathSegment?.let { java.net.URLDecoder.decode(it, "UTF-8") } ?: return null
+
+    // docId 格式: primary:path/to/dir 或 XXXX-XXXX:path/to/dir
+    val colonIdx = docId.indexOf(':')
+    if (colonIdx < 0) return null
+
+    val storageId = docId.substring(0, colonIdx)
+    val relPath = docId.substring(colonIdx + 1).trim('/')
+
+    return if (storageId.equals("primary", ignoreCase = true)) {
+        "/storage/emulated/0/$relPath"
+    } else {
+        "/storage/$storageId/$relPath"
+    }
+}

app/src/main/java/com/example/androidbackupgui/ui/ConfigViewModel.kt

@@ -1,28 +1,34 @@
 package com.example.androidbackupgui.ui
-
 import android.app.Application
 import android.util.Log
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.example.androidbackupgui.backup.BackupConfig
+import com.example.androidbackupgui.backup.PasswordManager
 import com.example.androidbackupgui.backup.ResticBinary
 import com.example.androidbackupgui.backup.ResticWrapper
-import com.example.androidbackupgui.backup.RemoteTransport
+import com.example.androidbackupgui.backup.defaultResticWrapper
+import com.example.androidbackupgui.backup.formatSize
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.cancelAndJoin
+import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import java.io.File
-import java.util.Locale
+import java.util.concurrent.atomic.AtomicBoolean
 
 /** UI-visible state driven by [ConfigViewModel]. */
 data class ConfigUiState(
     val config: BackupConfig = BackupConfig(),
     val backendDisplay: BackendDisplay = BackendDisplay(),
-    val resticStatus: ResticStatus = ResticStatus()
+    val resticStatus: ResticStatus = ResticStatus(),
 )
 
 data class BackendDisplay(
@@ -30,7 +36,7 @@ data class BackendDisplay(
     val needsAuth: Boolean = false,
     val isSmb: Boolean = false,
     val computedUrl: String = "",
-    val urlHint: String = ""
+    val urlHint: String = "",
 )
 
 data class ResticStatus(
@@ -41,56 +47,107 @@ data class ResticStatus(
     val statsButtonVisible: Boolean = false,
     val statsButtonEnabled: Boolean = true,
     val pruneButtonVisible: Boolean = false,
-    val pruneButtonEnabled: Boolean = true
+    val pruneButtonEnabled: Boolean = true,
+    val unlockButtonVisible: Boolean = false,
+    val unlockButtonEnabled: Boolean = true,
 )
 
 /** Restic credential/form snapshot passed from Fragment on every user interaction. */
 data class ResticForm(
-    val repo: String, val password: String,
-    val backend: String, val backendUrl: String,
-    val backendUser: String, val backendPass: String,
-    val backendShare: String, val backendDomain: String
+    val repo: String,
+    val password: String,
+    val backend: String,
+    val backendUrl: String,
+    val backendUser: String,
+    val backendPass: String,
+    val backendShare: String,
+    val backendDomain: String,
 )
 
-class ConfigViewModel(application: Application) : AndroidViewModel(application) {
+/**
+ * 类型安全的一键操作生命周期事件。
+ * [ConfigFragment] 应对此进行收集以触发一次性 UI 效果。
+ */
+sealed interface OperationEvent {
+    data object InitStarted : OperationEvent
 
+    data object InitCompleted : OperationEvent
+
+    data object InitFailed : OperationEvent
+
+    data object StatsStarted : OperationEvent
+
+    data object StatsCompleted : OperationEvent
+
+    data object PruneStarted : OperationEvent
+
+    data object PruneFailed : OperationEvent
+
+    data object PruneCompleted : OperationEvent
+
+    data object ConfigExported : OperationEvent
+
+    data object ConfigExportFailed : OperationEvent
+
+    data object ConfigImported : OperationEvent
+
+    data object ConfigImportFailed : OperationEvent
+}
+
+class ConfigViewModel(
+    application: Application,
+) : AndroidViewModel(application) {
     companion object {
         private const val TAG = "ConfigViewModel"
         private const val CONFIG_FILE_NAME = "backup_settings.conf"
 
-        fun deriveBackendDisplay(backend: String, repo: String, backendUrl: String): BackendDisplay {
+        fun deriveBackendDisplay(
+            backend: String,
+            repo: String,
+            backendUrl: String,
+        ): BackendDisplay {
             val isRemote = backend != "local"
             val needsAuth = backend == "webdav" || backend == "smb"
             val isSmb = backend == "smb"
-            val urlHint = when (backend) {
-                "webdav" -> "WebDAV 地址 (https://host:port/path)"
-                "smb" -> "SMB 主机地址 (host 或 host:port)"
-                "rest-server" -> "rest-server 地址 (http://host:port)"
-                else -> ""
-            }
-            val computedUrl = ResticWrapper.buildRepoUrl(backend, repo, backendUrl)
+            val urlHint =
+                when (backend) {
+                    "webdav" -> "WebDAV 地址 (https://host:port/path)"
+                    "smb" -> "SMB 主机地址 (host 或 host:port)"
+                    "rest-server" -> "rest-server 地址 (http://host:port)"
+                    else -> ""
+                }
+            val computedUrl = defaultResticWrapper.buildRepoUrl(backend, repo, backendUrl)
             return BackendDisplay(
-                isRemote = isRemote, needsAuth = needsAuth, isSmb = isSmb,
-                computedUrl = computedUrl, urlHint = urlHint
+                isRemote = isRemote,
+                needsAuth = needsAuth,
+                isSmb = isSmb,
+                computedUrl = computedUrl,
+                urlHint = urlHint,
             )
         }
-
-        fun formatSize(bytes: Long): String {
-            if (bytes < 1024) return "$bytes B"
-            val units = arrayOf("KB", "MB", "GB", "TB")
-            val exp = (63 - bytes.countLeadingZeroBits()) / 10
-            val value = bytes.toDouble() / (1L shl (exp * 10))
-            return "%.1f %s".format(Locale.US, value, units[exp - 1].coerceAtMost(units.last()))
-        }
     }
 
     private val configFile: File by lazy {
         File(getApplication<Application>().filesDir, CONFIG_FILE_NAME)
     }
 
+    /** One-shot operation lifecycle events (e.g. "operation started", "operation completed"). */
+    private val _operationEvents = MutableSharedFlow<OperationEvent>(extraBufferCapacity = 16)
+    val operationEvents: SharedFlow<OperationEvent> = _operationEvents.asSharedFlow()
+
     private val _uiState = MutableStateFlow(ConfigUiState())
     val uiState: StateFlow<ConfigUiState> = _uiState.asStateFlow()
 
+    /** Guards against concurrent [initResticRepo] calls. */
+    private val initGuard = AtomicBoolean(false)
+
+    /** Guards against stale [refreshResticStatus] coroutines. */
+    private var refreshJob: Job? = null
+
+    init {
+        load()
+    }
+
     /** Read config from file and refresh restic status. */
     fun load() {
         val config = BackupConfig.fromFile(configFile)
@@ -101,18 +158,40 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
         refreshResticStatus(readResticForm())
     }
 
-    /** Build a [ResticForm] snapshot from the current state's config values. */
-    private fun readResticForm() = _uiState.value.config.let { c ->
-        ResticForm(
-            repo = c.resticRepo, password = c.resticPassword,
-            backend = c.resticBackend, backendUrl = c.resticBackendUrl,
-            backendUser = c.resticBackendUser, backendPass = c.resticBackendPass,
-            backendShare = c.resticBackendShare, backendDomain = c.resticBackendDomain
-        )
-    }
+    /**
+     * Build a [ResticForm] snapshot from the current state's config values.
+     * 密码从 PasswordManager（加密存储）获取，不从配置文件读取。
+     */
+    private fun readResticForm() =
+        _uiState.value.config.let { c ->
+            // 从加密存储获取密码，如尚未设置则尝试从旧配置迁移
+            val password = PasswordManager.getResticPassword() ?: c.resticPassword.takeIf { it.isNotEmpty() }
+            val backendPass = PasswordManager.getBackendPass() ?: c.resticBackendPass.takeIf { it.isNotEmpty() }
+            // 如果发现旧配置中有密码但 PasswordManager 还没有，迁移过去
+            if (password != null && !PasswordManager.hasResticPassword() && password != "stored-in-keystore") {
+                PasswordManager.setResticPassword(password)
+            }
+            if (backendPass != null && backendPass != "stored-in-keystore" && PasswordManager.getBackendPass() == null) {
+                PasswordManager.setBackendPass(backendPass)
+            }
+            ResticForm(
+                repo = c.resticRepo,
+                password = password ?: "",
+                backend = c.resticBackend,
+                backendUrl = c.resticBackendUrl,
+                backendUser = c.resticBackendUser,
+                backendPass = backendPass ?: "",
+                backendShare = c.resticBackendShare,
+                backendDomain = c.resticBackendDomain,
+            )
+        }
 
     /** Update derived display state when backend/repo/url form fields change. */
-    fun onFormChanged(backend: String, repo: String, backendUrl: String) {
+    fun onFormChanged(
+        backend: String,
+        repo: String,
+        backendUrl: String,
+    ) {
         val bd = deriveBackendDisplay(backend, repo, backendUrl)
         _uiState.update { it.copy(backendDisplay = bd) }
     }
@@ -120,12 +199,151 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
     /**
      * Save config to file on IO and update status message.
      * The caller passes the current form values as a [BackupConfig] copy.
+     * 密码单独通过 [PasswordManager] 安全存储，不入配置文件。
      */
-    fun save(formConfig: BackupConfig) {
-        viewModelScope.launch(Dispatchers.IO) {
-            BackupConfig.toFile(formConfig, configFile)
+    fun save(
+        formConfig: BackupConfig,
+        resticPassword: String? = null,
+        backendPass: String? = null,
+    ) {
+        viewModelScope.launch {
+            // 保存密码到加密存储
+            if (resticPassword != null && resticPassword.isNotEmpty()) {
+                PasswordManager.setResticPassword(resticPassword)
+            }
+            if (backendPass != null && backendPass.isNotEmpty()) {
+                PasswordManager.setBackendPass(backendPass)
+            }
+            withContext(Dispatchers.IO) {
+                BackupConfig.toFile(formConfig, configFile)
+            }
             _uiState.update {
-                it.copy(resticStatus = it.resticStatus.copy(message = "配置已保存到 $configFile"))
+                it.copy(
+                    config = formConfig,
+                    backendDisplay =
+                        deriveBackendDisplay(
+                            formConfig.resticBackend,
+                            formConfig.resticRepo,
+                            formConfig.resticBackendUrl,
+                        ),
+                    resticStatus = it.resticStatus.copy(message = "配置已保存到 $configFile"),
+                )
+            }
+            refreshResticStatus(readResticForm())
+        }
+    }
+
+    /**
+     * Export the current saved config to a user-selected destination [Uri] (SAF).
+     * Writes the same on-disk config format, including the plaintext restic password,
+     * so the warning is surfaced in the UI before export.
+     */
+    fun exportConfig(uri: android.net.Uri) {
+        viewModelScope.launch {
+            val ok =
+                withContext(Dispatchers.IO) {
+                    try {
+                        // Ensure the latest saved config exists; serialize current UI config
+                        // if the file isn't there yet.
+                        val content =
+                            if (configFile.exists()) {
+                                configFile.readText()
+                            } else {
+                                val tmp = File.createTempFile("cfg", ".conf", getApplication<Application>().cacheDir)
+                                BackupConfig.toFile(_uiState.value.config, tmp)
+                                tmp.readText().also { tmp.delete() }
+                            }
+                        getApplication<Application>()
+                            .contentResolver
+                            .openOutputStream(uri)
+                            ?.use { out ->
+                                out.write(content.toByteArray())
+                                out.flush()
+                            } ?: return@withContext false
+                        true
+                    } catch (e: Exception) {
+                        Log.e(TAG, "exportConfig failed", e)
+                        false
+                    }
+                }
+            if (ok) {
+                _operationEvents.emit(OperationEvent.ConfigExported)
+                _uiState.update {
+                    it.copy(
+                        resticStatus =
+                            it.resticStatus.copy(
+                                message = "配置已导出（密码未包含，需在目标设备上通过应用重新输入）",
+                            ),
+                    )
+                }
+            } else {
+                _operationEvents.emit(OperationEvent.ConfigExportFailed)
+                _uiState.update { it.copy(resticStatus = it.resticStatus.copy(message = "配置导出失败")) }
+            }
+        }
+    }
+
+    /**
+     * Import config from a user-selected [Uri] (SAF).
+     * Reads the content, writes to configFile, and reloads UI state.
+     */
+    fun importConfig(uri: android.net.Uri) {
+        viewModelScope.launch {
+            val ok =
+                withContext(Dispatchers.IO) {
+                    try {
+                        val content =
+                            getApplication<Application>()
+                                .contentResolver
+                                .openInputStream(uri)
+                                ?.use { input -> input.reader().readText() }
+                                ?: return@withContext false
+                        configFile.writeText(content)
+                        val parsed = BackupConfig.fromFile(configFile)
+                        // 导入的配置中密码是 "stored-in-keystore" 占位符，
+                        // 需要从 PasswordManager 恢复真实密码，避免被覆盖
+                        val realResticPw = PasswordManager.getResticPassword()
+                        val realBackendPw = PasswordManager.getBackendPass()
+                        val restoredConfig =
+                            parsed.copy(
+                                resticPassword = realResticPw ?: parsed.resticPassword,
+                                resticBackendPass = realBackendPw ?: parsed.resticBackendPass,
+                            )
+                        _uiState.update { it.copy(config = restoredConfig) }
+                        Log.i(TAG, "importConfig: loaded config from SAF")
+                        true
+                    } catch (e: Exception) {
+                        Log.e(TAG, "importConfig failed", e)
+                        false
+                    }
+                }
+            if (ok) {
+                _operationEvents.emit(OperationEvent.ConfigImported)
+                _uiState.update {
+                    it.copy(
+                        resticStatus =
+                            it.resticStatus.copy(
+                                message = "配置已导入，请检查各项设置并保存",
+                            ),
+                    )
+                }
+                // Reload UI state from imported config，保留已有的密码
+                val s = _uiState.value
+                refreshResticStatus(
+                    ResticForm(
+                        repo = s.config.resticRepo,
+                        password = PasswordManager.getResticPassword() ?: "",
+                        backend = s.config.resticBackend,
+                        backendUrl = s.config.resticBackendUrl,
+                        backendUser = s.config.resticBackendUser,
+                        backendPass = PasswordManager.getBackendPass() ?: "",
+                        backendShare = s.config.resticBackendShare,
+                        backendDomain = s.config.resticBackendDomain,
+                    ),
+                )
+            } else {
+                _operationEvents.emit(OperationEvent.ConfigImportFailed)
+                _uiState.update { it.copy(resticStatus = it.resticStatus.copy(message = "配置导入失败")) }
             }
         }
     }
@@ -135,23 +353,32 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
         val ctx = getApplication<Application>()
         val binaryPath = ResticBinary.prepare(ctx)
         if (binaryPath == null) return false
-        ResticWrapper.binaryPath = binaryPath
-        ResticWrapper.tempRepoDir = ResticBinary.getTempRepoDir(ctx)
+        defaultResticWrapper.binaryPath = binaryPath
+        defaultResticWrapper.cacheDir = ctx.cacheDir.absolutePath
         return true
     }
 
     // ── Async restic operations ──────────────────────────────────────
 
     fun initResticRepo(form: ResticForm) {
+        if (!initGuard.compareAndSet(false, true)) {
+            Log.w(TAG, "initResticRepo: already in progress, ignoring")
+            return
+        }
         Log.i(TAG, "initResticRepo called: repo=${form.repo} backend=${form.backend}")
 
         if (!prepareRestic()) {
-            _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-                message = "restic 二进制未就绪，请确保已安装 restic 于 Termux 或 APK 内置版本可用"
-            ))}
+            _uiState.update {
+                it.copy(
+                    resticStatus =
+                        it.resticStatus.copy(
+                            message = "restic 二进制未就绪，请确保已安装 restic 于 Termux 或 APK 内置版本可用",
+                        ),
+                )
+            }
             return
         }
-        ResticWrapper.backendDomain = form.backendDomain
+        defaultResticWrapper.backendDomain = form.backendDomain
         Log.i(TAG, "initResticRepo: repo=${form.repo} backend=${form.backend} url=${form.backendUrl}")
 
         if (form.repo.isEmpty() || form.password.isEmpty()) {
@@ -159,181 +386,379 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
             return
         }
 
-        _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-            message = "正在初始化 restic 仓库…", initButtonEnabled = false
-        ))}
+        _uiState.update {
+            it.copy(
+                resticStatus =
+                    it.resticStatus.copy(
+                        message = "正在初始化 restic 仓库…",
+                        initButtonEnabled = false,
+                    ),
+            )
+        }
 
         viewModelScope.launch {
-            val result = ResticWrapper.init(form.repo, form.password,
-                backend = form.backend, backendUrl = form.backendUrl,
-                backendUser = form.backendUser, backendPass = form.backendPass,
-                backendShare = form.backendShare,
-                onSyncProgress = { p -> onSyncProgress(p) },
-                onByteSyncProgress = { p -> onByteProgress(p) },
-            )
-            result.fold(
-                onSuccess = {
-                    _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-                        message = "仓库初始化成功: ${form.repo}", initButtonEnabled = true
-                    ))}
+            try {
+                _operationEvents.emit(OperationEvent.InitStarted)
+                val result =
+                    defaultResticWrapper.init(
+                        form.repo,
+                        form.password,
+                        backend = form.backend,
+                        backendUrl = form.backendUrl,
+                        backendUser = form.backendUser,
+                        backendPass = form.backendPass,
+                        backendShare = form.backendShare,
+                    )
+                if (result.isSuccess) {
+                    _operationEvents.emit(OperationEvent.InitCompleted)
+                    _uiState.update {
+                        it.copy(
+                            resticStatus =
+                                it.resticStatus.copy(
+                                    message = "仓库初始化成功: ${form.repo}",
+                                ),
+                        )
+                    }
+                    refreshResticStatus(form)
+                } else {
+                    _operationEvents.emit(OperationEvent.InitFailed)
+                    Log.e(TAG, "initResticRepo failed: ${result.exceptionOrNull()?.message}")
+                    _uiState.update {
+                        it.copy(
+                            resticStatus =
+                                it.resticStatus.copy(
+                                    message = "初始化失败: ${result.exceptionOrNull()?.message}",
+                                ),
+                        )
+                    }
                     refreshResticStatus(form)
-                },
-                onFailure = { e ->
-                    Log.e(TAG, "initResticRepo failed", e)
-                    _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-                        message = "初始化失败: ${e.message}", initButtonEnabled = true
-                    ))}
                 }
-            )
+            } finally {
+                initGuard.set(false)
+            }
         }
     }
 
     fun refreshResticStatus(form: ResticForm) {
         if (form.repo.isBlank()) {
-            _uiState.update { it.copy(resticStatus = ResticStatus(
-                message = "请填写仓库路径和密码后初始化",
-                initButtonVisible = true, statsButtonVisible = false, pruneButtonVisible = false
-            ))}
+            _uiState.update {
+                it.copy(
+                    resticStatus =
+                        ResticStatus(
+                            message = "请填写仓库路径和密码后初始化",
+                            initButtonVisible = true,
+                            statsButtonVisible = false,
+                            pruneButtonVisible = false,
+                        ),
+                )
+            }
             return
         }
 
         if (!prepareRestic()) {
-            _uiState.update { it.copy(resticStatus = ResticStatus(
-                message = "restic 二进制未就绪",
-                initButtonVisible = true, statsButtonVisible = false, pruneButtonVisible = false
-            ))}
+            _uiState.update {
+                it.copy(
+                    resticStatus =
+                        ResticStatus(
+                            message = "restic 二进制未就绪",
+                            initButtonVisible = true,
+                            statsButtonVisible = false,
+                            pruneButtonVisible = false,
+                        ),
+                )
+            }
             return
         }
-        ResticWrapper.backendDomain = form.backendDomain
+        defaultResticWrapper.backendDomain = form.backendDomain
 
         _uiState.update { it.copy(resticStatus = it.resticStatus.copy(message = "正在检测仓库状态…")) }
 
-        viewModelScope.launch {
-            val snapshotsResult = ResticWrapper.listSnapshots(form.repo, form.password,
-                backend = form.backend, backendUrl = form.backendUrl,
-                backendUser = form.backendUser, backendPass = form.backendPass,
-                backendShare = form.backendShare,
-                onSyncProgress = { p -> onSyncProgress(p) },
-                onByteSyncProgress = { p -> onByteProgress(p) },
-            )
-            if (snapshotsResult.isSuccess) {
-                val snapshots = snapshotsResult.getOrDefault(emptyList())
-                _uiState.update { it.copy(resticStatus = ResticStatus(
-                    message = "仓库就绪，${snapshots.size} 个快照",
-                    snapshotCount = snapshots.size,
-                    initButtonVisible = false, statsButtonVisible = true, pruneButtonVisible = true
-                ))}
-            } else {
-                _uiState.update { it.copy(resticStatus = ResticStatus(
-                    message = "仓库未初始化或认证失败",
-                    initButtonVisible = true, statsButtonVisible = false, pruneButtonVisible = false
-                ))}
+        // Cancel any stale status check so a slow old coroutine doesn't overwrite new results
+        refreshJob?.cancel()
+        refreshJob =
+            viewModelScope.launch {
+                val snapshotsResult =
+                    defaultResticWrapper.listSnapshots(
+                        form.repo,
+                        form.password,
+                        backend = form.backend,
+                        backendUrl = form.backendUrl,
+                        backendUser = form.backendUser,
+                        backendPass = form.backendPass,
+                        backendShare = form.backendShare,
+                    )
+                if (snapshotsResult.isSuccess) {
+                    val snapshots = snapshotsResult.getOrDefault(emptyList())
+                    _uiState.update {
+                        it.copy(
+                            resticStatus =
+                                ResticStatus(
+                                    message = "仓库就绪，${snapshots.size} 个快照",
+                                    snapshotCount = snapshots.size,
+                                    initButtonVisible = false,
+                                    statsButtonVisible = true,
+                                    pruneButtonVisible = true,
+                                    unlockButtonVisible = true,
+                                ),
+                        )
+                    }
+                } else {
+                    val errMsg = snapshotsResult.errorOrNull()?.message ?: ""
+                    val hasLock = errMsg.contains("lock", ignoreCase = true) || errMsg.contains("already locked", ignoreCase = true)
+
+                    if (hasLock) {
+                        _uiState.update {
+                            it.copy(
+                                resticStatus =
+                                    ResticStatus(
+                                        message = "仓库被锁定，请先解锁",
+                                        initButtonVisible = false,
+                                        statsButtonVisible = false,
+                                        pruneButtonVisible = false,
+                                        unlockButtonVisible = true,
+                                    ),
+                            )
+                        }
+                    } else {
+                        // snapshots 失败时自动尝试 init（处理已初始化的旧仓库）
+                        val initResult =
+                            defaultResticWrapper.init(
+                                form.repo,
+                                form.password,
+                                backend = form.backend,
+                                backendUrl = form.backendUrl,
+                                backendUser = form.backendUser,
+                                backendPass = form.backendPass,
+                                backendShare = form.backendShare,
+                            )
+                        if (initResult.isSuccess) {
+                            val snaps =
+                                defaultResticWrapper
+                                    .listSnapshots(
+                                        form.repo,
+                                        form.password,
+                                        backend = form.backend,
+                                        backendUrl = form.backendUrl,
+                                        backendUser = form.backendUser,
+                                        backendPass = form.backendPass,
+                                        backendShare = form.backendShare,
+                                    ).getOrDefault(emptyList())
+                            _uiState.update {
+                                it.copy(
+                                    resticStatus =
+                                        ResticStatus(
+                                            message = "仓库就绪，${snaps.size} 个快照",
+                                            snapshotCount = snaps.size,
+                                            initButtonVisible = false,
+                                            statsButtonVisible = true,
+                                            pruneButtonVisible = true,
+                                            unlockButtonVisible = true,
+                                        ),
+                                )
+                            }
+                        } else {
+                            _uiState.update {
+                                it.copy(
+                                    resticStatus =
+                                        ResticStatus(
+                                            message = "仓库未初始化或认证失败",
+                                            initButtonVisible = true,
+                                            statsButtonVisible = false,
+                                            pruneButtonVisible = false,
+                                            unlockButtonVisible = false,
+                                        ),
+                                )
+                            }
+                        }
+                    }
+                }
             }
+    }
+
+    fun unlockResticRepo(form: ResticForm) {
+        _uiState.update {
+            it.copy(
+                resticStatus =
+                    it.resticStatus.copy(
+                        message = "正在解锁仓库…",
+                        unlockButtonEnabled = false,
+                    ),
+            )
+        }
+        viewModelScope.launch {
+            defaultResticWrapper.backendDomain = form.backendDomain
+            val result =
+                defaultResticWrapper.unlock(
+                    form.repo,
+                    form.password,
+                    backend = form.backend,
+                    backendUrl = form.backendUrl,
+                    backendUser = form.backendUser,
+                    backendPass = form.backendPass,
+                    backendShare = form.backendShare,
+                )
+            _uiState.update {
+                it.copy(
+                    resticStatus =
+                        it.resticStatus.copy(
+                            message = if (result.isSuccess) "解锁完成" else "解锁失败: ${result.errorOrNull()?.message}",
+                            unlockButtonEnabled = true,
+                        ),
+                )
+            }
+            refreshResticStatus(form)
         }
     }
 
     fun showResticStats(form: ResticForm) {
-        _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-            message = "正在读取统计…", statsButtonEnabled = false
-        ))}
+        _uiState.update {
+            it.copy(
+                resticStatus =
+                    it.resticStatus.copy(
+                        message = "正在读取统计…",
+                        statsButtonEnabled = false,
+                    ),
+            )
+        }
 
         viewModelScope.launch {
-            val statsResult = ResticWrapper.stats(form.repo, form.password,
-                backend = form.backend, backendUrl = form.backendUrl,
-                backendUser = form.backendUser, backendPass = form.backendPass,
-                backendShare = form.backendShare,
-                onSyncProgress = { p -> onSyncProgress(p) },
-                onByteSyncProgress = { p -> onByteProgress(p) },
-            )
-            val snapshotsResult = ResticWrapper.listSnapshots(form.repo, form.password,
-                backend = form.backend, backendUrl = form.backendUrl,
-                backendUser = form.backendUser, backendPass = form.backendPass,
-                backendShare = form.backendShare,
-                onSyncProgress = { p -> onSyncProgress(p) },
-                onByteSyncProgress = { p -> onByteProgress(p) },
-            )
+            try {
+                _operationEvents.emit(OperationEvent.StatsStarted)
+                val statsResult =
+                    defaultResticWrapper.stats(
+                        form.repo,
+                        form.password,
+                        backend = form.backend,
+                        backendUrl = form.backendUrl,
+                        backendUser = form.backendUser,
+                        backendPass = form.backendPass,
+                        backendShare = form.backendShare,
+                    )
+                val snapshotsResult =
+                    defaultResticWrapper.listSnapshots(
+                        form.repo,
+                        form.password,
+                        backend = form.backend,
+                        backendUrl = form.backendUrl,
+                        backendUser = form.backendUser,
+                        backendPass = form.backendPass,
+                        backendShare = form.backendShare,
+                    )
 
-            val snapshotCount = snapshotsResult.getOrDefault(emptyList()).size
-            _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-                message = buildString {
-                    appendLine("快照数: $snapshotCount")
-                    if (statsResult.isSuccess) {
-                        appendLine(statsResult.getOrDefault(""))
-                    } else {
-                        appendLine("统计读取失败: ${statsResult.exceptionOrNull()?.message}")
-                    }
-                },
-                snapshotCount = snapshotCount,
-                statsButtonEnabled = true
-            ))}
+                val snapshotCount = snapshotsResult.getOrDefault(emptyList()).size
+                _uiState.update {
+                    it.copy(
+                        resticStatus =
+                            it.resticStatus.copy(
+                                message =
+                                    buildString {
+                                        appendLine("快照数: $snapshotCount")
+                                        if (statsResult.isSuccess) {
+                                            appendLine(statsResult.getOrDefault(""))
+                                        } else {
+                                            appendLine("统计读取失败: ${statsResult.errorOrNull()?.message}")
+                                        }
+                                    },
+                                snapshotCount = snapshotCount,
+                                statsButtonEnabled = true,
+                            ),
+                    )
+                }
+                _operationEvents.emit(OperationEvent.StatsCompleted)
+            } finally {
+                _uiState.update { it.copy(resticStatus = it.resticStatus.copy(statsButtonEnabled = true)) }
+            }
         }
     }
 
     fun pruneResticSnapshots(form: ResticForm) {
-        _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-            message = "正在清理旧快照 (保留 7 天 / 4 周 / 3 月)…",
-            pruneButtonEnabled = false
-        ))}
+        _uiState.update {
+            it.copy(
+                resticStatus =
+                    it.resticStatus.copy(
+                        message = "正在清理旧快照 (保留 7 天 / 4 周 / 3 月)…",
+                        pruneButtonEnabled = false,
+                    ),
+            )
+        }
 
         viewModelScope.launch {
-            val forgetResult = ResticWrapper.forget(form.repo, form.password,
-                keepDaily = 7, keepWeekly = 4, keepMonthly = 3,
-                backend = form.backend, backendUrl = form.backendUrl,
-                backendUser = form.backendUser, backendPass = form.backendPass,
-                backendShare = form.backendShare,
-                onSyncProgress = { p -> onSyncProgress(p) },
-                onByteSyncProgress = { p -> onByteProgress(p) },
-            )
-            if (forgetResult.isFailure) {
-                _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-                    message = "forget 失败: ${forgetResult.exceptionOrNull()?.message}",
-                    pruneButtonEnabled = true
-                ))}
-                return@launch
+            try {
+                _operationEvents.emit(OperationEvent.PruneStarted)
+
+                // Remove stale locks before forget/prune
+                defaultResticWrapper.backendDomain = form.backendDomain
+                defaultResticWrapper.unlock(
+                    form.repo,
+                    form.password,
+                    backend = form.backend,
+                    backendUrl = form.backendUrl,
+                    backendUser = form.backendUser,
+                    backendPass = form.backendPass,
+                    backendShare = form.backendShare,
+                )
+
+                val forgetResult =
+                    defaultResticWrapper.forget(
+                        form.repo,
+                        form.password,
+                        keepDaily = 7,
+                        keepWeekly = 4,
+                        keepMonthly = 3,
+                        backend = form.backend,
+                        backendUrl = form.backendUrl,
+                        backendUser = form.backendUser,
+                        backendPass = form.backendPass,
+                        backendShare = form.backendShare,
+                    )
+                if (forgetResult.isFailure) {
+                    _operationEvents.emit(OperationEvent.PruneFailed)
+                    _uiState.update {
+                        it.copy(
+                            resticStatus =
+                                it.resticStatus.copy(
+                                    message = "forget 失败: ${forgetResult.exceptionOrNull()?.message}",
+                                    pruneButtonEnabled = true,
+                                ),
+                        )
+                    }
+                    return@launch
+                }
+
+                _uiState.update { it.copy(resticStatus = it.resticStatus.copy(message = "正在回收空间…")) }
+
+                val pruneResult =
+                    defaultResticWrapper.prune(
+                        form.repo,
+                        form.password,
+                        backend = form.backend,
+                        backendUrl = form.backendUrl,
+                        backendUser = form.backendUser,
+                        backendPass = form.backendPass,
+                        backendShare = form.backendShare,
+                    )
+                _uiState.update {
+                    it.copy(
+                        resticStatus =
+                            it.resticStatus.copy(
+                                message =
+                                    if (pruneResult.isSuccess) {
+                                        "清理完成！建议执行完整性检查 (check --read-data-subset=5%)"
+                                    } else {
+                                        "prune 失败: ${pruneResult.exceptionOrNull()?.message}"
+                                    },
+                                pruneButtonEnabled = true,
+                            ),
+                    )
+                }
+                if (pruneResult.isSuccess) {
+                    _operationEvents.emit(OperationEvent.PruneCompleted)
+                } else {
+                    _operationEvents.emit(OperationEvent.PruneFailed)
+                }
+            } finally {
+                _uiState.update { it.copy(resticStatus = it.resticStatus.copy(pruneButtonEnabled = true)) }
             }
-
-            _uiState.update { it.copy(resticStatus = it.resticStatus.copy(message = "正在回收空间…")) }
-
-            val pruneResult = ResticWrapper.prune(form.repo, form.password,
-                backend = form.backend, backendUrl = form.backendUrl,
-                backendUser = form.backendUser, backendPass = form.backendPass,
-                backendShare = form.backendShare,
-                onSyncProgress = { p -> onSyncProgress(p) },
-                onByteSyncProgress = { p -> onByteProgress(p) },
-            )
-            _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-                message = if (pruneResult.isSuccess)
-                    "清理完成！\n${pruneResult.getOrDefault("")}"
-                else
-                    "prune 失败: ${pruneResult.exceptionOrNull()?.message}",
-                pruneButtonEnabled = true
-            ))}
-        }
-    }
-
-    // ── Internal progress helpers ─────────────────────────────────────
-
-    private fun onSyncProgress(p: RemoteTransport.TransferProgress) {
-        _uiState.update {
-            it.copy(resticStatus = it.resticStatus.copy(
-                message = "同步中: ${p.current}/${p.total} 个文件"
-            ))
-        }
-    }
-
-    private fun onByteProgress(p: RemoteTransport.ByteProgress) {
-        _uiState.update {
-            it.copy(resticStatus = it.resticStatus.copy(
-                message = "同步中: ${p.currentFile}\n${formatSize(p.bytesTransferred)} / ${formatSize(p.totalBytes)}"
-            ))
-        }
-    }
-
-    /** Cleanup ResticWrapper resources when ViewModel is cleared. */
-    override fun onCleared() {
-        super.onCleared()
-        viewModelScope.launch(Dispatchers.IO) {
-            ResticWrapper.cleanup()
         }
     }
 }

app/src/main/java/com/example/androidbackupgui/ui/LogScreen.kt

@@ -0,0 +1,202 @@
+package com.example.androidbackupgui.ui
+
+import android.content.Context
+import android.net.Uri
+import android.util.Log
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material.icons.filled.FileDownload
+import androidx.compose.material.icons.filled.Refresh
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.unit.dp
+import com.example.androidbackupgui.backup.LogUtil
+import java.io.File
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun LogScreen() {
+    val context = LocalContext.current
+    var logFiles by remember { mutableStateOf(listOf<File>()) }
+    var selectedFile by remember { mutableStateOf<File?>(null) }
+    var logContent by remember { mutableStateOf<List<String>>(emptyList()) }
+    val scope = rememberCoroutineScope()
+
+    // Refresh log list
+    fun refresh() {
+        logFiles = LogUtil.getLogFiles()
+        if (selectedFile != null && selectedFile !in logFiles) {
+            selectedFile = null
+            logContent = emptyList()
+        }
+    }
+    LaunchedEffect(Unit) { refresh() }
+
+    // SAF export launcher
+    val exportLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.CreateDocument("text/plain")
+    ) { uri ->
+        if (uri != null && selectedFile != null) {
+            exportLogFile(context, uri, selectedFile!!)
+        }
+    }
+
+    Column(modifier = Modifier.fillMaxSize().padding(16.dp)) {
+        // ── Header ──
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            Text("运行日志", style = MaterialTheme.typography.titleMedium, modifier = Modifier.weight(1f))
+            IconButton(onClick = { refresh() }) {
+                Icon(Icons.Filled.Refresh, contentDescription = "刷新")
+            }
+        }
+
+        if (logFiles.isEmpty()) {
+            Text(
+                "暂无日志文件",
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.padding(vertical = 24.dp)
+            )
+        }
+
+        // ── Log file list ──
+        Text("日志文件", style = MaterialTheme.typography.labelLarge)
+        LazyColumn(
+            modifier = Modifier.heightIn(max = 160.dp),
+            verticalArrangement = Arrangement.spacedBy(4.dp)
+        ) {
+            items(logFiles, key = { it.absolutePath }) { file ->
+                val isSelected = file == selectedFile
+                Card(
+                    onClick = {
+                        selectedFile = file
+                        scope.launch {
+                            logContent = withContext(Dispatchers.IO) {
+                                file.readLines()
+                            }
+                        }
+                    },
+                    colors = CardDefaults.cardColors(
+                        containerColor = if (isSelected)
+                            MaterialTheme.colorScheme.primaryContainer
+                        else
+                            MaterialTheme.colorScheme.surfaceVariant
+                    )
+                ) {
+                    Row(
+                        modifier = Modifier.fillMaxWidth().padding(horizontal = 12.dp, vertical = 8.dp),
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
+                        Text(
+                            text = file.name,
+                            style = MaterialTheme.typography.bodySmall,
+                            modifier = Modifier.weight(1f)
+                        )
+                        Text(
+                            text = "${file.length() / 1024}KB",
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                }
+            }
+        }
+
+        Spacer(Modifier.height(12.dp))
+
+        // ── Action buttons ──
+        if (selectedFile != null) {
+            Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                OutlinedButton(
+                    onClick = { exportLauncher.launch(selectedFile!!.name) },
+                    modifier = Modifier.weight(1f)
+                ) {
+                    Icon(Icons.Filled.FileDownload, contentDescription = null, modifier = Modifier.size(18.dp))
+                    Spacer(Modifier.width(4.dp))
+                    Text("导出")
+                }
+                OutlinedButton(
+                    onClick = {
+                        selectedFile!!.delete()
+                        refresh()
+                    },
+                    colors = ButtonDefaults.outlinedButtonColors(
+                        contentColor = MaterialTheme.colorScheme.error
+                    ),
+                    modifier = Modifier.weight(1f)
+                ) {
+                    Icon(Icons.Filled.Delete, contentDescription = null, modifier = Modifier.size(18.dp))
+                    Spacer(Modifier.width(4.dp))
+                    Text("删除")
+                }
+            }
+            Spacer(Modifier.height(8.dp))
+
+            // ── Log content ──
+            Text(
+                "日志内容 — ${selectedFile!!.name}",
+                style = MaterialTheme.typography.labelLarge
+            )
+            Surface(
+                modifier = Modifier.fillMaxWidth().weight(1f),
+                color = MaterialTheme.colorScheme.surfaceVariant,
+                shape = MaterialTheme.shapes.small
+            ) {
+                if (logContent.isEmpty()) {
+                    Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+                        Text("（空）", color = MaterialTheme.colorScheme.onSurfaceVariant)
+                    }
+                } else {
+                    val scrollState = rememberScrollState()
+                    Column(
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .verticalScroll(scrollState)
+                            .padding(8.dp)
+                    ) {
+                        // Show last 500 lines (newest at bottom)
+                        val displayLines = logContent.takeLast(500)
+                        for (line in displayLines) {
+                            Text(
+                                text = line,
+                                style = MaterialTheme.typography.bodySmall.copy(
+                                    fontFamily = FontFamily.Monospace
+                                ),
+                                color = MaterialTheme.colorScheme.onSurfaceVariant
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+private fun exportLogFile(context: Context, uri: Uri, file: File) {
+    try {
+        context.contentResolver.openOutputStream(uri)?.use { out ->
+            file.inputStream().use { `in` ->
+                `in`.copyTo(out)
+            }
+        }
+    } catch (e: Exception) {
+        Log.e("LogScreen", "导出日志失败", e)
+    }
+}

app/src/main/java/com/example/androidbackupgui/ui/PackageListAdapter.kt

@@ -1,75 +0,0 @@
-package com.example.androidbackupgui.ui
-
-import android.view.View
-import android.view.ViewGroup
-import android.widget.CheckBox
-import android.widget.LinearLayout
-import android.widget.TextView
-import androidx.recyclerview.widget.RecyclerView
-import com.example.androidbackupgui.R
-import com.example.androidbackupgui.backup.AppInfo
-import com.google.android.material.card.MaterialCardView
-import com.google.android.material.color.MaterialColors
-
-/**
- * RecyclerView adapter showing app names (or package names as fallback) with checkboxes.
- * Used by both BackupFragment and RestoreFragment.
- */
-class PackageListAdapter(
-    private val apps: List<AppInfo>,
-    private val selected: Set<String>,
-    private val onToggle: (String, Boolean) -> Unit
-) : RecyclerView.Adapter<PackageListAdapter.ViewHolder>() {
-
-    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
-        val checkbox: CheckBox = view.findViewById(R.id.checkbox)
-        val textView: TextView = view.findViewById(R.id.appName)
-    }
-
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
-        val ctx = parent.context
-        val card = MaterialCardView(ctx).apply {
-            layoutParams = ViewGroup.MarginLayoutParams(
-                ViewGroup.LayoutParams.MATCH_PARENT,
-                ViewGroup.LayoutParams.WRAP_CONTENT
-            ).apply { setMargins(0, 0, 0, 8) }
-            radius = 12f
-            cardElevation = 0f
-            strokeWidth = 0
-            setCardBackgroundColor(
-                MaterialColors.getColor(ctx, com.google.android.material.R.attr.colorSurfaceContainer, 0)
-            )
-        }
-        val layout = LinearLayout(ctx).apply {
-            orientation = LinearLayout.HORIZONTAL
-            setPadding(16, 12, 16, 12)
-        }
-        val cb = CheckBox(ctx).apply { id = R.id.checkbox }
-        val tv = TextView(ctx).apply {
-            id = R.id.appName
-            setPadding(16, 0, 0, 0)
-            textSize = 15f
-            setTextColor(
-                MaterialColors.getColor(ctx, com.google.android.material.R.attr.colorOnSurface, 0)
-            )
-        }
-        layout.addView(cb)
-        layout.addView(tv)
-        card.addView(layout)
-        return ViewHolder(card)
-    }
-
-    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
-        val app = apps[position]
-        // Prefer app name (label), fall back to package name
-        holder.textView.text = app.label.ifEmpty { app.packageName }
-        // Avoid re-triggering listener during bind
-        holder.checkbox.setOnCheckedChangeListener(null)
-        holder.checkbox.isChecked = app.packageName in selected
-        holder.checkbox.setOnCheckedChangeListener { _, checked ->
-            onToggle(app.packageName, checked)
-        }
-    }
-
-    override fun getItemCount() = apps.size
-}

app/src/main/java/com/example/androidbackupgui/ui/RestoreFragment.kt

@@ -1,360 +0,0 @@
-package com.example.androidbackupgui.ui
-
-import android.os.Bundle
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
-import androidx.fragment.app.Fragment
-import android.app.AlertDialog
-import androidx.lifecycle.lifecycleScope
-import androidx.recyclerview.widget.LinearLayoutManager
-import com.example.androidbackupgui.backup.AppInfo
-import com.example.androidbackupgui.backup.AppScanner
-import com.example.androidbackupgui.backup.BackupConfig
-import com.example.androidbackupgui.backup.RestoreOperation
-import com.example.androidbackupgui.backup.ResticBinary
-import com.example.androidbackupgui.backup.ResticWrapper
-import com.example.androidbackupgui.backup.WifiManager
-import com.example.androidbackupgui.backup.RemoteTransport
-import com.example.androidbackupgui.databinding.FragmentRestoreBinding
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
-import java.io.File
-import java.util.Locale
-import kotlinx.coroutines.suspendCancellableCoroutine
-import kotlin.coroutines.resume
-
-class RestoreFragment : Fragment() {
-
-    private var _binding: FragmentRestoreBinding? = null
-    private val binding get() = _binding!!
-    private var backupDir: File? = null
-    private var packages: List<String> = emptyList()
-    private var appInfos: List<AppInfo> = emptyList()
-    private var selectedPackages = mutableSetOf<String>()
-    private var resticConfig: BackupConfig? = null
-    private var selectedSnapshot: ResticWrapper.ResticSnapshot? = null
-
-    override fun onCreateView(
-        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
-    ): View {
-        _binding = FragmentRestoreBinding.inflate(inflater, container, false)
-        return binding.root
-    }
-
-    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        super.onViewCreated(view, savedInstanceState)
-        binding.appList.layoutManager = LinearLayoutManager(requireContext())
-
-        // Load restic config
-        val configFile = File(requireContext().filesDir, "backup_settings.conf")
-        val config = BackupConfig.fromFile(configFile)
-
-        // Show restic button if enabled and binary available
-        if (config.resticEnabled == 1 && config.resticRepo.isNotBlank()) {
-            resticConfig = config
-            val binaryPath = ResticBinary.prepare(requireContext())
-            if (binaryPath != null) {
-                ResticWrapper.binaryPath = binaryPath
-                ResticWrapper.tempRepoDir = ResticBinary.getTempRepoDir(requireContext())
-                ResticWrapper.backendDomain = config.resticBackendDomain
-                binding.selectResticButton.visibility = View.VISIBLE
-            }
-        }
-
-        binding.selectDirButton.setOnClickListener { selectBackupDir() }
-        binding.selectResticButton.setOnClickListener { selectResticSnapshot() }
-        binding.restoreButton.setOnClickListener { startRestore() }
-    }
-
-    override fun onResume() {
-        super.onResume()
-        // Re-read config so changes from ConfigFragment take effect immediately
-        val configFile = File(requireContext().filesDir, "backup_settings.conf")
-        val config = BackupConfig.fromFile(configFile)
-        resticConfig = if (config.resticEnabled == 1 && config.resticRepo.isNotBlank()) config else null
-        val binaryPath = ResticBinary.prepare(requireContext())
-        if (binaryPath != null && resticConfig != null) {
-            ResticWrapper.binaryPath = binaryPath
-            ResticWrapper.tempRepoDir = ResticBinary.getTempRepoDir(requireContext())
-            ResticWrapper.backendDomain = config.resticBackendDomain
-            binding.selectResticButton.visibility = View.VISIBLE
-        }
-    }
-
-    private fun selectBackupDir() {
-        val defaultDir = File(requireContext().filesDir.absolutePath)
-        val backupDirs = defaultDir.listFiles()
-            ?.filter { it.isDirectory && it.name.startsWith("Backup_") }
-            ?: emptyList()
-
-        if (backupDirs.isNotEmpty()) {
-            backupDir = backupDirs.first()
-            selectedSnapshot = null
-            loadBackupDir(backupDirs.first())
-        } else {
-            binding.statusText.text = "未找到备份目录，请确保 Backup_* 文件夹存在于 ${defaultDir.absolutePath}"
-        }
-    }
-
-    private fun loadBackupDir(dir: File) {
-        binding.backupDirText.text = dir.absolutePath
-
-        val appListFile = File(dir, "appList.txt")
-        packages = if (appListFile.exists()) {
-            appListFile.readLines()
-                .map { it.trim() }
-                .filter { it.isNotEmpty() && !it.startsWith("#") }
-        } else {
-            dir.listFiles()
-                ?.filter { it.isDirectory }
-                ?.map { it.name }
-                ?: emptyList()
-        }
-
-        selectedPackages.clear()
-        selectedPackages.addAll(packages)
-
-        binding.statusText.text = "共 ${packages.size} 个备份应用"
-        binding.restoreButton.isEnabled = packages.isNotEmpty()
-
-        appInfos = AppScanner.resolveLabels(requireContext(), packages.map { AppInfo(packageName = it) })
-        setupAppList()
-    }
-
-    private fun selectResticSnapshot() {
-        val config = resticConfig ?: return
-        setRunning(true)
-        binding.statusText.text = "正在读取 restic 快照列表…"
-
-        viewLifecycleOwner.lifecycleScope.launch {
-            val snapshotsResult = ResticWrapper.listSnapshots(
-                config.resticRepo, config.resticPassword,
-                backend = config.resticBackend,
-                backendUrl = config.resticBackendUrl,
-                backendUser = config.resticBackendUser,
-                backendPass = config.resticBackendPass,
-                backendShare = config.resticBackendShare
-            )
-            if (snapshotsResult.isFailure) {
-                binding.statusText.text = "读取快照失败: ${snapshotsResult.exceptionOrNull()?.message}"
-                setRunning(false)
-                return@launch
-            }
-
-            val snapshots = snapshotsResult.getOrThrow()
-            if (snapshots.isEmpty()) {
-                binding.statusText.text = "没有可用的 restic 快照"
-                setRunning(false)
-                return@launch
-            }
-
-            // 多快照时让用户选择，单个快照自动选
-            val chosenSnapshot = if (snapshots.size == 1) {
-                snapshots.first()
-            } else {
-                pickSnapshot(snapshots) ?: run {
-                    binding.statusText.text = "已取消选择"
-                    setRunning(false)
-                    return@launch
-                }
-            }
-
-            // Switch to restic source
-            backupDir = null
-            selectedSnapshot = chosenSnapshot
-            val backupPath = selectedSnapshot!!.paths.firstOrNull() ?: run {
-                binding.statusText.text = "快照中找不到备份路径"
-                setRunning(false)
-                return@launch
-            }
-
-            // Read app list from the snapshot
-            val appListContent = readResticFile(config, selectedSnapshot!!.id, "$backupPath/appList.txt")
-            packages = if (appListContent != null) {
-                appListContent.lines().map { it.trim() }.filter { it.isNotEmpty() && !it.startsWith("#") }
-            } else {
-                emptyList()
-            }
-
-            if (packages.isEmpty()) {
-                binding.statusText.text = "无法从快照读取应用列表"
-                setRunning(false)
-                return@launch
-            }
-
-            binding.backupDirText.text = "restic: ${selectedSnapshot!!.time.take(19)} (${snapshots.size} 个快照可用)"
-            selectedPackages.clear()
-
-            selectedPackages.addAll(packages)
-
-            // Resolve app labels for display
-            appInfos = AppScanner.resolveLabels(requireContext(), packages.map { AppInfo(packageName = it) })
-
-            binding.statusText.text = "restic 快照共 ${packages.size} 个应用，点击恢复开始"
-            binding.restoreButton.isEnabled = true
-            setRunning(false)
-            setupAppList()
-        }
-    }
-
-    /** 多快照时弹出选择对话框。返回用户选择的快照，取消时返回 null。 */
-    private suspend fun pickSnapshot(snapshots: List<ResticWrapper.ResticSnapshot>): ResticWrapper.ResticSnapshot? =
-        suspendCancellableCoroutine { cont ->
-            val names = snapshots.map { "${it.time.take(19)} (${it.id.take(8)})" }
-            AlertDialog.Builder(requireContext())
-                .setTitle("选择快照")
-                .setItems(names.toTypedArray()) { _, i -> cont.resume(snapshots[i]) }
-                .setOnCancelListener { cont.resume(null) }
-                .show()
-        }
-
-    /** Read a single file from a restic snapshot using `restic dump`. */
-    private suspend fun readResticFile(
-        config: BackupConfig,
-        snapshotId: String,
-        filePath: String
-    ): String? {
-        val result = ResticWrapper.dump(
-            config.resticRepo, config.resticPassword,
-            snapshotId, filePath,
-            backend = config.resticBackend,
-            backendUrl = config.resticBackendUrl,
-            backendUser = config.resticBackendUser,
-            backendPass = config.resticBackendPass,
-            backendShare = config.resticBackendShare
-        )
-        return result.getOrNull()
-    }
-
-    private fun setupAppList() {
-        binding.appList.adapter = PackageListAdapter(appInfos, selectedPackages) { pkg, checked ->
-            if (checked) selectedPackages.add(pkg) else selectedPackages.remove(pkg)
-            binding.statusText.text = "已选择 ${selectedPackages.size}/${packages.size} 个应用"
-        }
-    }
-
-    private fun startRestore() {
-        val toRestore = packages.filter { it in selectedPackages }
-        if (toRestore.isEmpty()) return
-
-        setRunning(true)
-        binding.restoreButton.isEnabled = false
-        binding.selectDirButton.isEnabled = false
-
-        viewLifecycleOwner.lifecycleScope.launch {
-            val result = if (selectedSnapshot != null && resticConfig != null) {
-                // Restic restore
-                val snapshot = selectedSnapshot!!
-                val config = resticConfig!!
-                val backupPath = snapshot.paths.firstOrNull() ?: return@launch
-                val staging = File(requireContext().cacheDir, "restic_restore_${snapshot.shortId}")
-                staging.mkdirs()
-                try {
-                    binding.statusText.text = "正在从 restic 快照恢复到暂存目录…"
-                    val restoreResult = ResticWrapper.restore(
-                        repoPath = config.resticRepo,
-                        password = config.resticPassword,
-                        snapshotId = snapshot.id,
-                        targetPath = staging.absolutePath,
-                        backend = config.resticBackend,
-                        backendUrl = config.resticBackendUrl,
-                        backendUser = config.resticBackendUser,
-                        backendPass = config.resticBackendPass,
-                        backendShare = config.resticBackendShare,
-                        onSyncProgress = { progress: RemoteTransport.TransferProgress ->
-                            withContext(Dispatchers.Main) {
-                                when (progress.phase) {
-                                    "list", "download", "upload", "delete_stale" ->
-                                        binding.statusText.text = "同步中: ${progress.current}/${progress.total} 个文件"
-                                }
-                            }
-                        },
-                        onByteSyncProgress = { progress ->
-                            withContext(Dispatchers.Main) {
-                                binding.progressBar.max = progress.totalBytes.toInt().coerceAtLeast(1)
-                                binding.progressBar.progress = progress.bytesTransferred.toInt()
-                                binding.statusText.text = "同步中: ${progress.currentFile}\n" +
-                                    "${formatSize(progress.bytesTransferred)} / ${formatSize(progress.totalBytes)}"
-                            }
-                        },
-                        onProgress = { msg -> binding.statusText.text = msg }
-                    )
-
-                    if (restoreResult.isFailure) {
-                        binding.statusText.text = "restic 恢复失败: ${restoreResult.exceptionOrNull()?.message}"
-                        setRunning(false)
-                        binding.selectDirButton.isEnabled = true
-                        return@launch
-                    }
-
-                    // The restored backup directory: <staging>/<original_absolute_path>
-                    val restoredBackupDir = File(staging, backupPath.removePrefix("/"))
-                    binding.statusText.text = "正在从恢复的备份安装应用…"
-
-                    val r = RestoreOperation.restoreApps(
-                        backupDir = restoredBackupDir,
-                        filterPkgs = selectedPackages,
-                        onProgress = { progress ->
-                            val label = appInfos.find { it.packageName == progress.packageName }?.label
-                            val name = label?.ifEmpty { progress.packageName } ?: progress.packageName
-                            binding.statusText.text =
-                                "[${progress.current}/${progress.total}] $name: ${progress.message}"
-                        }
-                    )
-                    // Also restore WiFi if backup exists
-                    WifiManager.restore(restoredBackupDir)
-                    r
-                } finally {
-                    try { staging.deleteRecursively() } catch (_: Exception) {}
-                }
-            } else {
-                // Local restore
-                val dir = backupDir ?: return@launch
-                val r = RestoreOperation.restoreApps(
-                    backupDir = dir,
-                    filterPkgs = selectedPackages,
-                    onProgress = { progress ->
-                        val label = appInfos.find { it.packageName == progress.packageName }?.label
-                        val name = label?.ifEmpty { progress.packageName } ?: progress.packageName
-                        binding.statusText.text =
-                            "[${progress.current}/${progress.total}] $name: ${progress.message}"
-                    }
-                )
-                // Also restore WiFi if backup exists locally
-                WifiManager.restore(dir)
-                r
-            }
-
-            binding.statusText.text = buildString {
-                appendLine("恢复完成！")
-                appendLine("成功: ${result.successCount}  失败: ${result.failCount}")
-                appendLine("耗时: ${result.elapsedMs / 1000}秒")
-                appendLine("如有 SSAID，请立即重启设备后再开启应用")
-            }
-            setRunning(false)
-            binding.selectDirButton.isEnabled = true
-        }
-    }
-
-    private fun setRunning(running: Boolean) {
-        binding.progressBar.visibility = if (running) View.VISIBLE else View.GONE
-    }
-
-    private fun formatSize(bytes: Long): String {
-        if (bytes < 1024) return "$bytes B"
-        val units = arrayOf("KB", "MB", "GB", "TB")
-        val exp = (63 - bytes.countLeadingZeroBits()) / 10
-        val value = bytes.toDouble() / (1L shl (exp * 10))
-        return "%.1f %s".format(Locale.US, value, units[exp - 1].coerceAtMost(units.last()))
-    }
-
-    override fun onDestroyView() {
-        viewLifecycleOwner.lifecycleScope.launch(Dispatchers.IO) {
-            ResticWrapper.cleanup()
-        }
-        super.onDestroyView()
-        _binding = null
-    }
-}

app/src/main/java/com/example/androidbackupgui/ui/RestoreScreen.kt

@@ -0,0 +1,592 @@
+package com.example.androidbackupgui.ui
+import android.net.Uri
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import com.example.androidbackupgui.backup.*
+import com.example.androidbackupgui.backup.defaultResticWrapper
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.io.File
+
+@Composable
+fun RestoreScreen() {
+    val context = LocalContext.current
+    val scope = rememberCoroutineScope()
+
+    // ── State ──
+    var backupDir by remember { mutableStateOf<File?>(null) }
+    var packages by remember { mutableStateOf<List<String>>(emptyList()) }
+    var appInfos by remember { mutableStateOf<List<AppInfo>>(emptyList()) }
+    var selectedPackages by remember { mutableStateOf<Set<String>>(emptySet()) }
+    var resticConfig by remember { mutableStateOf<BackupConfig?>(null) }
+    var config by remember { mutableStateOf(BackupConfig()) }
+    var selectedSnapshot by remember { mutableStateOf<ResticWrapper.ResticSnapshot?>(null) }
+    var isRunning by remember { mutableStateOf(false) }
+    var statusText by remember { mutableStateOf("请选择备份源") }
+    var showSnapshotPicker by remember { mutableStateOf(false) }
+    var availableSnapshots by remember { mutableStateOf<List<ResticWrapper.ResticSnapshot>>(emptyList()) }
+    val configFile = remember { File(context.filesDir, "backup_settings.conf") }
+
+    // SAF directory picker for selecting external backup dir
+    val dirPickerLauncher =
+        rememberLauncherForActivityResult(
+            contract = ActivityResultContracts.OpenDocumentTree(),
+        ) { uri ->
+            if (uri != null) {
+                val resolvedPath = resolveSafTreeUri(uri)
+                if (resolvedPath != null) {
+                    val dir = File(resolvedPath)
+                    backupDir = dir
+                    selectedSnapshot = null
+                    scope.launch {
+                        loadFromDir(context, dir) { pkgs, infos, status ->
+                            packages = pkgs
+                            appInfos = infos
+                            selectedPackages = pkgs.toSet()
+                            statusText = status
+                        }
+                    }
+                }
+            }
+        }
+
+    // Load config
+    LaunchedEffect(Unit) {
+        config = BackupConfig.fromFile(configFile)
+        if (config.resticEnabled == 1 && config.resticRepo.isNotBlank()) {
+            resticConfig = config
+        }
+    }
+
+    Column(modifier = Modifier.fillMaxSize()) {
+        // ── Top controls card ──
+        Card(modifier = Modifier.fillMaxWidth().padding(12.dp)) {
+            Column(modifier = Modifier.padding(12.dp), verticalArrangement = Arrangement.spacedBy(8.dp)) {
+                // Source buttons row
+                Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                    OutlinedButton(
+                        onClick = {
+                            scope.launch {
+                                try {
+                                    val defaultDir = context.filesDir
+                                    val backupDirs =
+                                        withContext(Dispatchers.IO) {
+                                            defaultDir
+                                                .listFiles()
+                                                ?.filter { it.isDirectory && it.name.startsWith("Backup_") }
+                                                ?: emptyList()
+                                        }
+                                    if (backupDirs.isNotEmpty()) {
+                                        val dir = backupDirs.first()
+                                        backupDir = dir
+                                        selectedSnapshot = null
+                                        loadFromDir(context, dir) { pkgs, infos, status ->
+                                            packages = pkgs
+                                            appInfos = infos
+                                            selectedPackages = pkgs.toSet()
+                                            statusText = status
+                                        }
+                                    } else {
+                                        statusText = "未找到备份目录"
+                                    }
+                                } catch (e: Exception) {
+                                    statusText = "选择目录失败: ${e.message}"
+                                }
+                            }
+                        },
+                        enabled = !isRunning,
+                        modifier = Modifier.weight(1f),
+                    ) {
+                        Text("本地备份")
+                    }
+
+                    OutlinedButton(
+                        onClick = { dirPickerLauncher.launch(null) },
+                        enabled = !isRunning,
+                        modifier = Modifier.weight(1f),
+                    ) {
+                        Text("选择目录")
+                    }
+
+                    Button(
+                        onClick = {
+                            val config =
+                                resticConfig ?: run {
+                                    statusText = "未配置 Restic，请先在设置中配置"
+                                    return@Button
+                                }
+                            scope.launch {
+                                isRunning = true
+                                statusText = "正在读取快照…"
+                                try {
+                                    // 配置 ResticWrapper 环境
+                                    defaultResticWrapper.cacheDir = context.cacheDir.absolutePath
+                                    defaultResticWrapper.backendDomain = config.resticBackendDomain
+                                    ResticBinary.prepare(context)?.let { defaultResticWrapper.binaryPath = it }
+
+                                    // 从 PasswordManager 恢复密码（过滤掉占位符）
+                                    fun configPw(
+                                        key: String?,
+                                        fallback: String,
+                                    ): String = key?.takeIf { it.isNotEmpty() && it != "stored-in-keystore" } ?: fallback
+                                    val realPassword = configPw(PasswordManager.getResticPassword(), config.resticPassword)
+                                    val realBackendPass = configPw(PasswordManager.getBackendPass(), config.resticBackendPass)
+                                    val result =
+                                        withContext(Dispatchers.IO) {
+                                            defaultResticWrapper.listSnapshots(
+                                                config.resticRepo,
+                                                realPassword,
+                                                backend = config.resticBackend,
+                                                backendUrl = config.resticBackendUrl,
+                                                backendUser = config.resticBackendUser,
+                                                backendPass = realBackendPass,
+                                                backendShare = config.resticBackendShare,
+                                            )
+                                        }
+                                    if (result.isFailure) {
+                                        statusText = "读取快照失败: ${result.exceptionOrNull()?.message}"
+                                        return@launch
+                                    }
+                                    val snaps = result.getOrThrow()
+                                    if (snaps.isEmpty()) {
+                                        statusText = "没有可用的 restic 快照"
+                                        return@launch
+                                    }
+                                    availableSnapshots = snaps
+                                    if (snaps.size == 1) {
+                                        loadResticSnapshot(context, snaps.first(), resticConfig!!) { pkgs, infos, status ->
+                                            backupDir = null
+                                            selectedSnapshot = snaps.first()
+                                            packages = pkgs
+                                            appInfos = infos
+                                            selectedPackages = pkgs.toSet()
+                                            statusText = status
+                                        }
+                                    } else {
+                                        showSnapshotPicker = true
+                                    }
+                                } catch (e: Exception) {
+                                    statusText = "选择快照失败: ${e.message}"
+                                } finally {
+                                    isRunning = false
+                                }
+                            }
+                        },
+                        enabled = !isRunning && resticConfig != null,
+                        modifier = Modifier.weight(1f),
+                    ) {
+                        Text("Restic 快照")
+                    }
+                }
+
+                // Source info text
+                val sourceText =
+                    if (backupDir != null) {
+                        backupDir!!.absolutePath
+                    } else if (selectedSnapshot != null) {
+                        "restic: ${selectedSnapshot!!.time.take(19)}"
+                    } else {
+                        ""
+                    }
+                if (sourceText.isNotEmpty()) {
+                    Text(
+                        text = sourceText,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
+            }
+        }
+
+        // ── Status ──
+        Text(
+            text = statusText,
+            style = MaterialTheme.typography.bodySmall,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.padding(horizontal = 12.dp, vertical = 4.dp),
+        )
+
+        // ── App list ──
+        LazyColumn(
+            modifier = Modifier.weight(1f).fillMaxWidth(),
+            contentPadding = PaddingValues(horizontal = 12.dp, vertical = 4.dp),
+            verticalArrangement = Arrangement.spacedBy(4.dp),
+        ) {
+            items(appInfos, key = { it.packageName.value }) { app ->
+                Card(
+                    onClick = {
+                        val pkg = app.packageName.value
+                        selectedPackages =
+                            if (pkg in selectedPackages) {
+                                selectedPackages - pkg
+                            } else {
+                                selectedPackages + pkg
+                            }
+                    },
+                    modifier = Modifier.fillMaxWidth(),
+                ) {
+                    Row(
+                        modifier = Modifier.padding(12.dp),
+                        verticalAlignment = Alignment.CenterVertically,
+                    ) {
+                        Checkbox(
+                            checked = app.packageName.value in selectedPackages,
+                            onCheckedChange = { checked ->
+                                val pkg = app.packageName.value
+                                selectedPackages =
+                                    if (checked) {
+                                        selectedPackages + pkg
+                                    } else {
+                                        selectedPackages - pkg
+                                    }
+                            },
+                        )
+                        Spacer(Modifier.width(8.dp))
+                        Column {
+                            Text(
+                                text = app.label.ifEmpty { app.packageName.value },
+                                style = MaterialTheme.typography.bodyLarge,
+                            )
+                            Text(
+                                text = app.packageName.value,
+                                style = MaterialTheme.typography.bodySmall,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+                        }
+                    }
+                }
+            }
+        }
+
+        // ── Bottom bar ──
+        Surface(modifier = Modifier.fillMaxWidth(), tonalElevation = 3.dp) {
+            Button(
+                onClick = {
+                    val toRestore = packages.filter { it in selectedPackages }
+                    if (toRestore.isEmpty()) return@Button
+                    isRunning = true
+                    statusText = "开始恢复 ${toRestore.size} 个应用…"
+
+                    scope.launch {
+                        try {
+                            if (selectedSnapshot != null && resticConfig != null) {
+                                val snapshot = selectedSnapshot!!
+                                val config = resticConfig!!
+                                val backupPath = snapshot.paths.firstOrNull() ?: return@launch
+                                val staging = File(context.cacheDir, "restic_restore_${snapshot.shortId}")
+                                staging.mkdirs()
+
+                                try {
+                                    statusText = "正在从 restic 快照恢复…"
+                                    val restoreResult =
+                                        withContext(Dispatchers.IO) {
+                                            val rPw =
+                                                PasswordManager.getResticPassword()?.takeIf { it != "stored-in-keystore" }
+                                                    ?: config.resticPassword
+                                            val rBpw =
+                                                PasswordManager.getBackendPass()?.takeIf { it != "stored-in-keystore" }
+                                                    ?: config.resticBackendPass
+                                            defaultResticWrapper.restore(
+                                                repoPath = config.resticRepo,
+                                                password = rPw,
+                                                snapshotId = snapshot.id,
+                                                targetPath = staging.absolutePath,
+                                                backend = config.resticBackend,
+                                                backendUrl = config.resticBackendUrl,
+                                                backendUser = config.resticBackendUser,
+                                                backendPass = rBpw,
+                                                backendShare = config.resticBackendShare,
+                                            )
+                                        }
+                                    if (restoreResult.isFailure) {
+                                        statusText = "restic 恢复失败: ${restoreResult.exceptionOrNull()?.message}"
+                                        return@launch
+                                    }
+                                    val restoredDir = File(staging, backupPath.removePrefix("/"))
+                                    statusText = "正在从恢复的备份安装应用…"
+
+                                    val result =
+                                        withContext(Dispatchers.IO) {
+                                            RestoreOperation.restoreApps(
+                                                context = context,
+                                                backupDir = restoredDir,
+                                                userId = config.backupUserId.toString(),
+                                                filterPkgs = selectedPackages,
+                                                onProgress = { progress ->
+                                                    statusText =
+                                                        "[${progress.current}/${progress.total}] ${progress.packageName}: ${progress.message}"
+                                                },
+                                            )
+                                        }
+                                    WifiManager.restore(restoredDir)
+                                    statusText =
+                                        buildString {
+                                            appendLine("恢复完成！")
+                                            appendLine("成功: ${result.successCount} 失败: ${result.failCount}")
+                                            append("耗时: ${result.elapsedMs / 1000}秒")
+                                        }
+                                } finally {
+                                    try {
+                                        staging.deleteRecursively()
+                                    } catch (_: Exception) {
+                                    }
+                                }
+                            } else if (backupDir != null) {
+                                val dir = backupDir!!
+                                val result =
+                                    withContext(Dispatchers.IO) {
+                                        RestoreOperation.restoreApps(
+                                            context = context,
+                                            backupDir = dir,
+                                            userId = config.backupUserId.toString(),
+                                            filterPkgs = selectedPackages,
+                                            onProgress = { progress ->
+                                                statusText =
+                                                    "[${progress.current}/${progress.total}] ${progress.packageName}: ${progress.message}"
+                                            },
+                                        )
+                                    }
+                                WifiManager.restore(dir)
+                                statusText =
+                                    buildString {
+                                        appendLine("恢复完成！")
+                                        appendLine("成功: ${result.successCount} 失败: ${result.failCount}")
+                                        append("耗时: ${result.elapsedMs / 1000}秒")
+                                    }
+                            }
+                        } catch (e: Exception) {
+                            statusText = "恢复异常: ${e.message}"
+                        } finally {
+                            isRunning = false
+                        }
+                    }
+                },
+                enabled = !isRunning && selectedPackages.isNotEmpty() && (backupDir != null || selectedSnapshot != null),
+                modifier = Modifier.fillMaxWidth().padding(12.dp),
+            ) {
+                if (isRunning) {
+                    CircularProgressIndicator(modifier = Modifier.size(16.dp))
+                    Spacer(Modifier.width(8.dp))
+                }
+                Text("开始恢复 (${selectedPackages.size})")
+            }
+        }
+    }
+
+    // ── Snapshot picker dialog ──
+    if (showSnapshotPicker && availableSnapshots.isNotEmpty()) {
+        AlertDialog(
+            onDismissRequest = { showSnapshotPicker = false },
+            title = { Text("选择快照") },
+            text = {
+                Column {
+                    availableSnapshots.forEach { snap ->
+                        val label = "${snap.time.take(19)} (${snap.shortId})"
+                        TextButton(
+                            onClick = {
+                                showSnapshotPicker = false
+                                scope.launch {
+                                    loadResticSnapshot(context, snap, resticConfig!!) { pkgs, infos, status ->
+                                        backupDir = null
+                                        selectedSnapshot = snap
+                                        packages = pkgs
+                                        appInfos = infos
+                                        selectedPackages = pkgs.toSet()
+                                        statusText = status
+                                    }
+                                }
+                            },
+                            modifier = Modifier.fillMaxWidth(),
+                        ) { Text(label) }
+                    }
+                }
+            },
+            confirmButton = {
+                TextButton(onClick = { showSnapshotPicker = false }) { Text("取消") }
+            },
+        )
+    }
+}
+
+private suspend fun loadFromDir(
+    context: android.content.Context,
+    dir: File,
+    onResult: (packages: List<String>, appInfos: List<AppInfo>, status: String) -> Unit,
+) {
+    withContext(Dispatchers.IO) {
+        val appListFile = File(dir, "appList.txt")
+        val pkgs =
+            BackupOperation.readTextFile(appListFile)?.let { content ->
+                content.lines().map { it.trim() }.filter { it.isNotEmpty() && !it.startsWith("#") }
+            } ?: run {
+                BackupOperation.listBackupFiles(dir)
+                    ?: emptyList()
+            }
+        // Filter to only apps that have actual backup data (at least one APK)
+        val validPkgs =
+            pkgs.filter { pkg ->
+                val appDir = File(dir, pkg)
+                val files = BackupOperation.listBackupFiles(appDir)
+                files?.any { it.endsWith(".apk") } == true
+            }
+        val skipped = pkgs.size - validPkgs.size
+        // Read cached labels from app_details.json (includes uninstalled apps)
+        val cachedLabels = readLocalAppDetails(dir)
+        val preLabeled =
+            validPkgs.map { pkg ->
+                AppInfo(packageName = PackageName(pkg), label = cachedLabels[pkg] ?: "")
+            }
+        // Resolve labels for currently installed apps, keep cached labels for uninstalled
+        val resolved = AppScanner.resolveLabels(context, preLabeled)
+        // For apps that resolveLabels fell back to package name, restore cached label
+        val infos =
+            resolved.map { app ->
+                val cachedLabel = cachedLabels[app.packageName.value]
+                if (cachedLabel != null && app.label == app.packageName.value) {
+                    app.copy(label = cachedLabel)
+                } else {
+                    app
+                }
+            }
+        val suffix = if (skipped > 0) "（${skipped}个应用备份数据缺失已自动跳过）" else ""
+        onResult(validPkgs, infos, "共 ${validPkgs.size} 个备份应用$suffix")
+    }
+}
+
+private suspend fun loadResticSnapshot(
+    context: android.content.Context,
+    snapshot: ResticWrapper.ResticSnapshot,
+    config: BackupConfig,
+    onResult: (packages: List<String>, appInfos: List<AppInfo>, status: String) -> Unit,
+) {
+    val backupPath =
+        snapshot.paths.firstOrNull() ?: run {
+            onResult(emptyList(), emptyList(), "快照中找不到备份路径")
+            return
+        }
+
+    fun rp(
+        key: String?,
+        fallback: String,
+    ) = key?.takeIf { it.isNotEmpty() && it != "stored-in-keystore" } ?: fallback
+    val realPassword = rp(PasswordManager.getResticPassword(), config.resticPassword)
+    val realBackendPass = rp(PasswordManager.getBackendPass(), config.resticBackendPass)
+
+    suspend fun tryDump(path: String) =
+        defaultResticWrapper
+            .dump(
+                config.resticRepo,
+                realPassword,
+                snapshot.id,
+                path,
+                backend = config.resticBackend,
+                backendUrl = config.resticBackendUrl,
+                backendUser = config.resticBackendUser,
+                backendPass = realBackendPass,
+                backendShare = config.resticBackendShare,
+            ).getOrNull()
+    // 兼容流式备份（新版：根目录，旧版：meta/）和普通备份
+    val content =
+        tryDump("$backupPath/appList.txt")
+            ?: tryDump("$backupPath/meta/appList.txt")
+    if (content == null) {
+        onResult(emptyList(), emptyList(), "无法从快照读取应用列表")
+        return
+    }
+    val pkgs =
+        content
+            .lines()
+            .map { it.trim() }
+            .filter { it.isNotEmpty() && !it.startsWith("#") }
+
+    // Read cached labels from app_details.json in the snapshot
+    val cachedLabels = loadResticAppDetails(config, snapshot.id, backupPath)
+    val preLabeled =
+        pkgs.map { pkg ->
+            AppInfo(packageName = PackageName(pkg), label = cachedLabels[pkg] ?: "")
+        }
+    val resolved = AppScanner.resolveLabels(context, preLabeled)
+    val infos =
+        resolved.map { app ->
+            val cachedLabel = cachedLabels[app.packageName.value]
+            if (cachedLabel != null && app.label == app.packageName.value) {
+                app.copy(label = cachedLabel)
+            } else {
+                app
+            }
+        }
+    onResult(pkgs, infos, "restic 快照共 ${pkgs.size} 个应用")
+}
+
+/** Read app_details.json from a local backup directory and return a package→label map. */
+private suspend fun readLocalAppDetails(dir: File): Map<String, String> =
+    withContext(Dispatchers.IO) {
+        val metaFile = File(dir, "app_details.json")
+        val json = BackupOperation.readTextFile(metaFile) ?: return@withContext emptyMap()
+        try {
+            defaultResticWrapper.parseAppDetailsJson(json).mapValues { it.value.label }
+        } catch (_: Exception) {
+            emptyMap()
+        }
+    }
+
+/** Dump app_details.json from a restic snapshot and return a package→label map. */
+private suspend fun loadResticAppDetails(
+    config: BackupConfig,
+    snapshotId: String,
+    backupPath: String,
+): Map<String, String> {
+    fun rp2(
+        key: String?,
+        fallback: String,
+    ) = key?.takeIf { it.isNotEmpty() && it != "stored-in-keystore" } ?: fallback
+    val realPassword = rp2(PasswordManager.getResticPassword(), config.resticPassword)
+    val realBackendPass = rp2(PasswordManager.getBackendPass(), config.resticBackendPass)
+
+    suspend fun tryDump(path: String) =
+        defaultResticWrapper
+            .dump(
+                config.resticRepo,
+                realPassword,
+                snapshotId,
+                path,
+                backend = config.resticBackend,
+                backendUrl = config.resticBackendUrl,
+                backendUser = config.resticBackendUser,
+                backendPass = realBackendPass,
+                backendShare = config.resticBackendShare,
+            ).getOrNull()
+    val json =
+        tryDump("$backupPath/app_details.json")
+            ?: tryDump("$backupPath/meta/app_details.json")
+            ?: return emptyMap()
+    return try {
+        defaultResticWrapper.parseAppDetailsJson(json).mapValues { it.value.label }
+    } catch (_: Exception) {
+        emptyMap()
+    }
+}
+
+/** Convert SAF tree URI to a filesystem path. */
+private fun resolveSafTreeUri(uri: Uri): String? {
+    val docId = uri.lastPathSegment?.let { java.net.URLDecoder.decode(it, "UTF-8") } ?: return null
+    val colonIdx = docId.indexOf(':')
+    if (colonIdx < 0) return null
+    val storageId = docId.substring(0, colonIdx)
+    val relPath = docId.substring(colonIdx + 1).trim('/')
+    return if (storageId.equals("primary", ignoreCase = true)) {
+        "/storage/emulated/0/$relPath"
+    } else {
+        "/storage/$storageId/$relPath"
+    }
+}

app/src/main/java/com/example/androidbackupgui/ui/theme/Color.kt

@@ -0,0 +1,69 @@
+package com.example.androidbackupgui.ui.theme
+
+import androidx.compose.ui.graphics.Color
+
+// Material 3 light scheme colors
+val md_theme_light_primary = Color(0xFF1A6B52)
+val md_theme_light_onPrimary = Color(0xFFFFFFFF)
+val md_theme_light_primaryContainer = Color(0xFFA4F2D3)
+val md_theme_light_onPrimaryContainer = Color(0xFF002117)
+val md_theme_light_secondary = Color(0xFF4C6359)
+val md_theme_light_onSecondary = Color(0xFFFFFFFF)
+val md_theme_light_secondaryContainer = Color(0xFFCEE9DB)
+val md_theme_light_onSecondaryContainer = Color(0xFF092017)
+val md_theme_light_tertiary = Color(0xFF3F6373)
+val md_theme_light_onTertiary = Color(0xFFFFFFFF)
+val md_theme_light_tertiaryContainer = Color(0xFFC3E8FB)
+val md_theme_light_onTertiaryContainer = Color(0xFF001F29)
+val md_theme_light_error = Color(0xFFBA1A1A)
+val md_theme_light_onError = Color(0xFFFFFFFF)
+val md_theme_light_errorContainer = Color(0xFFFFDAD6)
+val md_theme_light_onErrorContainer = Color(0xFF410002)
+val md_theme_light_background = Color(0xFFFBFDF9)
+val md_theme_light_onBackground = Color(0xFF191C1A)
+val md_theme_light_surface = Color(0xFFFBFDF9)
+val md_theme_light_onSurface = Color(0xFF191C1A)
+val md_theme_light_surfaceVariant = Color(0xFFDBE5DD)
+val md_theme_light_onSurfaceVariant = Color(0xFF404943)
+val md_theme_light_outline = Color(0xFF707973)
+val md_theme_light_outlineVariant = Color(0xFFBFC9C2)
+val md_theme_light_inverseSurface = Color(0xFF2E312E)
+val md_theme_light_inverseOnSurface = Color(0xFFF0F1ED)
+val md_theme_light_inversePrimary = Color(0xFF88D6B8)
+val md_theme_light_surfaceTint = Color(0xFF1A6B52)
+
+// Material 3 dark scheme colors
+val md_theme_dark_primary = Color(0xFF88D6B8)
+val md_theme_dark_onPrimary = Color(0xFF003828)
+val md_theme_dark_primaryContainer = Color(0xFF00513C)
+val md_theme_dark_onPrimaryContainer = Color(0xFFA4F2D3)
+val md_theme_dark_secondary = Color(0xFFB3CCC0)
+val md_theme_dark_onSecondary = Color(0xFF1F352B)
+val md_theme_dark_secondaryContainer = Color(0xFF354B41)
+val md_theme_dark_onSecondaryContainer = Color(0xFFCEE9DB)
+val md_theme_dark_tertiary = Color(0xFFA7CCDF)
+val md_theme_dark_onTertiary = Color(0xFF083544)
+val md_theme_dark_tertiaryContainer = Color(0xFF254B5B)
+val md_theme_dark_onTertiaryContainer = Color(0xFFC3E8FB)
+val md_theme_dark_error = Color(0xFFFFB4AB)
+val md_theme_dark_onError = Color(0xFF690005)
+val md_theme_dark_errorContainer = Color(0xFF93000A)
+val md_theme_dark_onErrorContainer = Color(0xFFFFDAD6)
+val md_theme_dark_background = Color(0xFF191C1A)
+val md_theme_dark_onBackground = Color(0xFFE1E3DF)
+val md_theme_dark_surface = Color(0xFF191C1A)
+val md_theme_dark_onSurface = Color(0xFFE1E3DF)
+val md_theme_dark_surfaceVariant = Color(0xFF404943)
+val md_theme_dark_onSurfaceVariant = Color(0xFFBFC9C2)
+val md_theme_dark_outline = Color(0xFF89938C)
+val md_theme_dark_outlineVariant = Color(0xFF404943)
+val md_theme_dark_inverseSurface = Color(0xFFE1E3DF)
+val md_theme_dark_inverseOnSurface = Color(0xFF191C1A)
+val md_theme_dark_inversePrimary = Color(0xFF1A6B52)
+val md_theme_dark_surfaceTint = Color(0xFF88D6B8)
+
+// Status colors
+val StatusSuccess = Color(0xFF2E7D32)
+val StatusWarning = Color(0xFFF57F17)
+val StatusError = Color(0xFFD32F2F)
+val StatusInfo = Color(0xFF1976D2)

app/src/main/java/com/example/androidbackupgui/ui/theme/Theme.kt

@@ -0,0 +1,98 @@
+package com.example.androidbackupgui.ui.theme
+
+import android.app.Activity
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.SideEffect
+import androidx.compose.ui.graphics.toArgb
+import androidx.compose.ui.platform.LocalView
+import androidx.core.view.WindowCompat
+
+private val LightColorScheme = lightColorScheme(
+    primary = md_theme_light_primary,
+    onPrimary = md_theme_light_onPrimary,
+    primaryContainer = md_theme_light_primaryContainer,
+    onPrimaryContainer = md_theme_light_onPrimaryContainer,
+    secondary = md_theme_light_secondary,
+    onSecondary = md_theme_light_onSecondary,
+    secondaryContainer = md_theme_light_secondaryContainer,
+    onSecondaryContainer = md_theme_light_onSecondaryContainer,
+    tertiary = md_theme_light_tertiary,
+    onTertiary = md_theme_light_onTertiary,
+    tertiaryContainer = md_theme_light_tertiaryContainer,
+    onTertiaryContainer = md_theme_light_onTertiaryContainer,
+    error = md_theme_light_error,
+    onError = md_theme_light_onError,
+    errorContainer = md_theme_light_errorContainer,
+    onErrorContainer = md_theme_light_onErrorContainer,
+    background = md_theme_light_background,
+    onBackground = md_theme_light_onBackground,
+    surface = md_theme_light_surface,
+    onSurface = md_theme_light_onSurface,
+    surfaceVariant = md_theme_light_surfaceVariant,
+    onSurfaceVariant = md_theme_light_onSurfaceVariant,
+    outline = md_theme_light_outline,
+    outlineVariant = md_theme_light_outlineVariant,
+    inverseSurface = md_theme_light_inverseSurface,
+    inverseOnSurface = md_theme_light_inverseOnSurface,
+    inversePrimary = md_theme_light_inversePrimary,
+    surfaceTint = md_theme_light_surfaceTint,
+)
+
+private val DarkColorScheme = darkColorScheme(
+    primary = md_theme_dark_primary,
+    onPrimary = md_theme_dark_onPrimary,
+    primaryContainer = md_theme_dark_primaryContainer,
+    onPrimaryContainer = md_theme_dark_onPrimaryContainer,
+    secondary = md_theme_dark_secondary,
+    onSecondary = md_theme_dark_onSecondary,
+    secondaryContainer = md_theme_dark_secondaryContainer,
+    onSecondaryContainer = md_theme_dark_onSecondaryContainer,
+    tertiary = md_theme_dark_tertiary,
+    onTertiary = md_theme_dark_onTertiary,
+    tertiaryContainer = md_theme_dark_tertiaryContainer,
+    onTertiaryContainer = md_theme_dark_onTertiaryContainer,
+    error = md_theme_dark_error,
+    onError = md_theme_dark_onError,
+    errorContainer = md_theme_dark_errorContainer,
+    onErrorContainer = md_theme_dark_onErrorContainer,
+    background = md_theme_dark_background,
+    onBackground = md_theme_dark_onBackground,
+    surface = md_theme_dark_surface,
+    onSurface = md_theme_dark_onSurface,
+    surfaceVariant = md_theme_dark_surfaceVariant,
+    onSurfaceVariant = md_theme_dark_onSurfaceVariant,
+    outline = md_theme_dark_outline,
+    outlineVariant = md_theme_dark_outlineVariant,
+    inverseSurface = md_theme_dark_inverseSurface,
+    inverseOnSurface = md_theme_dark_inverseOnSurface,
+    inversePrimary = md_theme_dark_inversePrimary,
+    surfaceTint = md_theme_dark_surfaceTint,
+)
+
+@Composable
+fun AppTheme(
+    darkTheme: Boolean = isSystemInDarkTheme(),
+    content: @Composable () -> Unit
+) {
+    val colorScheme = if (darkTheme) DarkColorScheme else LightColorScheme
+
+    // Set status bar colors to match theme
+    val view = LocalView.current
+    if (!view.isInEditMode) {
+        SideEffect {
+            val window = (view.context as Activity).window
+            window.statusBarColor = colorScheme.surface.toArgb()
+            WindowCompat.getInsetsController(window, view).isAppearanceLightStatusBars = !darkTheme
+        }
+    }
+
+    MaterialTheme(
+        colorScheme = colorScheme,
+        typography = AppTypography,
+        content = content
+    )
+}

app/src/main/java/com/example/androidbackupgui/ui/theme/Type.kt

@@ -0,0 +1,91 @@
+package com.example.androidbackupgui.ui.theme
+
+import androidx.compose.material3.Typography
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.sp
+
+val AppTypography = Typography(
+    displayLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 57.sp,
+        lineHeight = 64.sp,
+        letterSpacing = (-0.25).sp
+    ),
+    headlineLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.SemiBold,
+        fontSize = 32.sp,
+        lineHeight = 40.sp
+    ),
+    headlineMedium = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.SemiBold,
+        fontSize = 28.sp,
+        lineHeight = 36.sp
+    ),
+    titleLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.SemiBold,
+        fontSize = 22.sp,
+        lineHeight = 28.sp
+    ),
+    titleMedium = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Medium,
+        fontSize = 16.sp,
+        lineHeight = 24.sp,
+        letterSpacing = 0.15.sp
+    ),
+    titleSmall = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Medium,
+        fontSize = 14.sp,
+        lineHeight = 20.sp,
+        letterSpacing = 0.1.sp
+    ),
+    bodyLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 16.sp,
+        lineHeight = 24.sp,
+        letterSpacing = 0.5.sp
+    ),
+    bodyMedium = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 14.sp,
+        lineHeight = 20.sp,
+        letterSpacing = 0.25.sp
+    ),
+    bodySmall = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 12.sp,
+        lineHeight = 16.sp,
+        letterSpacing = 0.4.sp
+    ),
+    labelLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Medium,
+        fontSize = 14.sp,
+        lineHeight = 20.sp,
+        letterSpacing = 0.1.sp
+    ),
+    labelMedium = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Medium,
+        fontSize = 12.sp,
+        lineHeight = 16.sp,
+        letterSpacing = 0.5.sp
+    ),
+    labelSmall = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Medium,
+        fontSize = 11.sp,
+        lineHeight = 16.sp,
+        letterSpacing = 0.5.sp
+    )
+)

app/src/main/res/drawable/ic_backup.xml

@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportWidth="24"
-    android:viewportHeight="24">
-
-    <path
-        android:fillColor="#000000"
-        android:pathData="M19,9h-4V3H9v6H5l7,7 7,-7zM5,18v2h14v-2H5z" />
-</vector>

app/src/main/res/drawable/ic_config.xml

@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportWidth="24"
-    android:viewportHeight="24">
-
-    <path
-        android:fillColor="#000000"
-        android:pathData="M19.14,12.94c0.04,-0.3 0.06,-0.61 0.06,-0.94 0,-0.32 -0.02,-0.64 -0.07,-0.94l2.03,-1.58c0.18,-0.14 0.23,-0.41 0.12,-0.61l-1.92,-3.32c-0.12,-0.22 -0.37,-0.29 -0.59,-0.22l-2.39,0.96c-0.5,-0.38 -1.03,-0.7 -1.62,-0.94L14.4,2.81c-0.04,-0.24 -0.24,-0.41 -0.48,-0.41h-3.84c-0.24,0 -0.43,0.17 -0.47,0.41L9.25,5.35C8.66,5.59 8.12,5.92 7.63,6.29L5.24,5.33c-0.22,-0.08 -0.47,0 -0.59,0.22L2.74,8.87C2.62,9.08 2.66,9.34 2.86,9.48l2.03,1.58C4.84,11.36 4.8,11.69 4.8,12s0.02,0.64 0.07,0.94l-2.03,1.58c-0.18,0.14 -0.23,0.41 -0.12,0.61l1.92,3.32c0.12,0.22 0.37,0.29 0.59,0.22l2.39,-0.96c0.5,0.38 1.03,0.7 1.62,0.94l0.36,2.54c0.05,0.24 0.24,0.41 0.48,0.41h3.84c0.24,0 0.44,-0.17 0.47,-0.41l0.36,-2.54c0.59,-0.24 1.13,-0.56 1.62,-0.94l2.39,0.96c0.22,0.08 0.47,0 0.59,-0.22l1.92,-3.32c0.12,-0.22 0.07,-0.47 -0.12,-0.61l-2.01,-1.58zM12,15.6c-1.98,0 -3.6,-1.62 -3.6,-3.6s1.62,-3.6 3.6,-3.6 3.6,1.62 3.6,3.6 -1.62,3.6 -3.6,3.6z" />
-</vector>

app/src/main/res/drawable/ic_restore.xml

@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportWidth="24"
-    android:viewportHeight="24">
-
-    <path
-        android:fillColor="#000000"
-        android:pathData="M9,16h6v-6h4l-7,-7 -7,7h4zM5,18h14v2H5z" />
-</vector>

app/src/main/res/layout/activity_main.xml

@@ -1,33 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:background="?attr/colorSurface">
-
-    <com.google.android.material.appbar.MaterialToolbar
-        android:id="@+id/topAppBar"
-        android:layout_width="match_parent"
-        android:layout_height="?attr/actionBarSize"
-        android:background="?attr/colorSurface"
-        app:title="@string/app_name"
-        app:titleCentered="true"
-        app:titleTextColor="?attr/colorOnSurface"
-        style="@style/Widget.Material3.Toolbar" />
-
-    <androidx.viewpager2.widget.ViewPager2
-        android:id="@+id/viewPager"
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1" />
-
-    <com.google.android.material.bottomnavigation.BottomNavigationView
-        android:id="@+id/bottomNav"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:background="?attr/colorSurfaceContainer"
-        app:menu="@menu/bottom_nav"
-        app:labelVisibilityMode="labeled" />
-
-</LinearLayout>

app/src/main/res/layout/fragment_backup.xml

@@ -1,69 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:padding="16dp"
-    android:background="?attr/colorSurface">
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:gravity="center_vertical"
-        android:orientation="horizontal">
-
-        <TextView
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="应用备份"
-            android:textAppearance="@style/TextAppearance.Material3.HeadlineSmall"
-            android:textColor="?attr/colorOnSurface" />
-
-        <com.google.android.material.button.MaterialButton
-            android:id="@+id/scanButton"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:text="扫描应用"
-            style="@style/Widget.Material3.Button.TonalButton" />
-    </LinearLayout>
-
-    <com.google.android.material.progressindicator.LinearProgressIndicator
-        android:id="@+id/progressBar"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="12dp"
-        android:indeterminate="true"
-        android:visibility="gone"
-        app:indicatorColor="?attr/colorPrimary"
-        app:trackColor="?attr/colorSurfaceVariant" />
-
-    <TextView
-        android:id="@+id/statusText"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="8dp"
-        android:text="点击扫描以载入应用列表"
-        android:textAppearance="@style/TextAppearance.Material3.BodySmall"
-        android:textColor="?attr/colorOnSurfaceVariant" />
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/appList"
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1"
-        android:layout_marginTop="12dp"
-        android:clipToPadding="false"
-        android:paddingBottom="8dp" />
-
-    <com.google.android.material.button.MaterialButton
-        android:id="@+id/backupButton"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="12dp"
-        android:enabled="false"
-        android:text="开始备份选中应用"
-        style="@style/Widget.Material3.Button" />
-
-</LinearLayout>

app/src/main/res/layout/fragment_config.xml

@@ -1,387 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:background="?attr/colorSurface"
-    android:clipToPadding="false"
-    android:padding="16dp">
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="vertical">
-
-        <!-- ═══════ 备份选项 ═══════ -->
-        <com.google.android.material.card.MaterialCardView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginBottom="16dp"
-            app:cardElevation="0dp"
-            app:cardBackgroundColor="?attr/colorSurfaceContainer"
-            app:strokeWidth="0dp"
-            app:contentPadding="16dp">
-
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical">
-
-                <TextView
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:text="备份选项"
-                    android:textAppearance="@style/TextAppearance.Material3.TitleMedium"
-                    android:textColor="?attr/colorPrimary" />
-
-                <com.google.android.material.switchmaterial.SwitchMaterial
-                    android:id="@+id/backupModeSwitch"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="12dp"
-                    android:text="备份数据+安装包 (关闭则仅备份安装包)" />
-
-                <com.google.android.material.switchmaterial.SwitchMaterial
-                    android:id="@+id/backupUserDataSwitch"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="4dp"
-                    android:text="备份用户数据" />
-
-                <com.google.android.material.switchmaterial.SwitchMaterial
-                    android:id="@+id/backupObbSwitch"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="4dp"
-                    android:text="备份 OBB 外部数据包" />
-
-                <com.google.android.material.switchmaterial.SwitchMaterial
-                    android:id="@+id/backupWifiSwitch"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="4dp"
-                    android:text="备份 WiFi 设置" />
-
-                <com.google.android.material.switchmaterial.SwitchMaterial
-                    android:id="@+id/ignoreRunningSwitch"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="4dp"
-                    android:text="忽略运行中的应用" />
-
-            </LinearLayout>
-        </com.google.android.material.card.MaterialCardView>
-
-        <!-- ═══════ 输出路径 ═══════ -->
-        <com.google.android.material.card.MaterialCardView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginBottom="16dp"
-            app:cardElevation="0dp"
-            app:cardBackgroundColor="?attr/colorSurfaceContainer"
-            app:strokeWidth="0dp"
-            app:contentPadding="16dp">
-
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical">
-
-                <TextView
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:text="输出路径"
-                    android:textAppearance="@style/TextAppearance.Material3.TitleMedium"
-                    android:textColor="?attr/colorPrimary" />
-
-                <com.google.android.material.textfield.TextInputLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="12dp"
-                    android:hint="输出路径 (留空使用默认)"
-                    style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-                    <com.google.android.material.textfield.TextInputEditText
-                        android:id="@+id/outputPathEdit"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:singleLine="true" />
-                </com.google.android.material.textfield.TextInputLayout>
-
-                <com.google.android.material.textfield.TextInputLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:hint="压缩算法 (zstd / tar)"
-                    style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-                    <com.google.android.material.textfield.TextInputEditText
-                        android:id="@+id/compressionEdit"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:singleLine="true"
-                        android:text="zstd" />
-                </com.google.android.material.textfield.TextInputLayout>
-
-            </LinearLayout>
-        </com.google.android.material.card.MaterialCardView>
-
-        <!-- ═══════ Restic 云端备份 ═══════ -->
-        <com.google.android.material.card.MaterialCardView
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginBottom="16dp"
-            app:cardElevation="0dp"
-            app:cardBackgroundColor="?attr/colorSurfaceContainer"
-            app:strokeWidth="0dp"
-            app:contentPadding="16dp">
-
-            <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical">
-
-                <TextView
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:text="Restic 云端备份"
-                    android:textAppearance="@style/TextAppearance.Material3.TitleMedium"
-                    android:textColor="?attr/colorPrimary" />
-
-                <com.google.android.material.switchmaterial.SwitchMaterial
-                    android:id="@+id/resticEnabledSwitch"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="12dp"
-                    android:text="启用 restic 增量去重 (需安装 restic 二进制)" />
-
-                <!-- Backend selector -->
-                <TextView
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="12dp"
-                    android:text="存储位置"
-                    android:textAppearance="@style/TextAppearance.Material3.LabelLarge"
-                    android:textColor="?attr/colorOnSurface" />
-
-                <com.google.android.material.button.MaterialButtonToggleGroup
-                    android:id="@+id/resticBackendGroup"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="4dp"
-                    app:singleSelection="true"
-                    app:selectionRequired="true">
-
-                    <com.google.android.material.button.MaterialButton
-                        android:id="@+id/resticBackendLocal"
-                        android:layout_width="0dp"
-                        android:layout_height="wrap_content"
-                        android:layout_weight="1"
-                        android:text="本机"
-                        style="@style/Widget.Material3.Button.TonalButton" />
-
-                    <com.google.android.material.button.MaterialButton
-                        android:id="@+id/resticBackendWebdav"
-                        android:layout_width="0dp"
-                        android:layout_height="wrap_content"
-                        android:layout_weight="1"
-                        android:text="WebDAV"
-                        style="@style/Widget.Material3.Button.TonalButton" />
-
-                    <com.google.android.material.button.MaterialButton
-                        android:id="@+id/resticBackendSmb"
-                        android:layout_width="0dp"
-                        android:layout_height="wrap_content"
-                        android:layout_weight="1"
-                        android:text="SMB"
-                        style="@style/Widget.Material3.Button.TonalButton" />
-
-                    <com.google.android.material.button.MaterialButton
-                        android:id="@+id/resticBackendRestServer"
-                        android:layout_width="0dp"
-                        android:layout_height="wrap_content"
-                        android:layout_weight="1"
-                        android:text="REST"
-                        style="@style/Widget.Material3.Button.TonalButton" />
-
-                </com.google.android.material.button.MaterialButtonToggleGroup>
-
-                <!-- Backend URL (WebDAV/SMB only) -->
-                <com.google.android.material.textfield.TextInputLayout
-                    android:id="@+id/resticBackendUrlLayout"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:hint="WebDAV 地址 (https://host:port/path)"
-                    android:visibility="gone"
-                    style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-                    <com.google.android.material.textfield.TextInputEditText
-                        android:id="@+id/resticBackendUrlEdit"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:singleLine="true"
-                        android:inputType="textUri" />
-                </com.google.android.material.textfield.TextInputLayout>
-
-                <!-- SMB share name (SMB only) -->
-                <com.google.android.material.textfield.TextInputLayout
-                    android:id="@+id/resticBackendShareLayout"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:hint="SMB 共享名称 (如 backup、shared)"
-                    android:visibility="gone"
-                    style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-                    <com.google.android.material.textfield.TextInputEditText
-                        android:id="@+id/resticBackendShareEdit"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:singleLine="true" />
-                </com.google.android.material.textfield.TextInputLayout>
-
-                <!-- Backend user (WebDAV/SMB only) -->
-                <com.google.android.material.textfield.TextInputLayout
-                    android:id="@+id/resticBackendUserLayout"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:hint="用户名"
-                    android:visibility="gone"
-                    style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-                    <com.google.android.material.textfield.TextInputEditText
-                        android:id="@+id/resticBackendUserEdit"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:singleLine="true" />
-                </com.google.android.material.textfield.TextInputLayout>
-
-                <!-- Backend password (WebDAV/SMB only) -->
-                <com.google.android.material.textfield.TextInputLayout
-                    android:id="@+id/resticBackendPassLayout"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:hint="密码"
-                    android:visibility="gone"
-                    style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-                    <com.google.android.material.textfield.TextInputEditText
-                        android:id="@+id/resticBackendPassEdit"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:inputType="textPassword"
-                        android:singleLine="true" />
-                </com.google.android.material.textfield.TextInputLayout>
-
-                <!-- SMB domain (SMB only, optional) -->
-                <com.google.android.material.textfield.TextInputLayout
-                    android:id="@+id/resticBackendDomainLayout"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:hint="SMB 域 (可选，如 WORKGROUP)"
-                    android:visibility="gone"
-                    style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-                    <com.google.android.material.textfield.TextInputEditText
-                        android:id="@+id/resticBackendDomainEdit"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:singleLine="true" />
-                </com.google.android.material.textfield.TextInputLayout>
-
-                <!-- Repo path (always shown) -->
-                <com.google.android.material.textfield.TextInputLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:hint="仓库路径 (本机: /sdcard/restic-repo / 云端: 目录名如 android-backups)"
-                    style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-                    <com.google.android.material.textfield.TextInputEditText
-                        android:id="@+id/resticRepoEdit"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:singleLine="true" />
-                </com.google.android.material.textfield.TextInputLayout>
-
-                <!-- Repo encryption password (always shown) -->
-                <com.google.android.material.textfield.TextInputLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:hint="仓库加密密码 (请妥善保管，遗失即无法恢复)"
-                    style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-                    <com.google.android.material.textfield.TextInputEditText
-                        android:id="@+id/resticPasswordEdit"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:inputType="textPassword"
-                        android:singleLine="true" />
-                </com.google.android.material.textfield.TextInputLayout>
-
-                <!-- Computed repo URL -->
-                <TextView
-                    android:id="@+id/resticComputedUrlText"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="4dp"
-                    android:textAppearance="@style/TextAppearance.Material3.BodySmall"
-                    android:textColor="?attr/colorOnSurfaceVariant" />
-
-                <!-- Action buttons -->
-                <LinearLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:gravity="center_vertical"
-                    android:orientation="horizontal">
-
-                    <com.google.android.material.button.MaterialButton
-                        android:id="@+id/initResticButton"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="初始化"
-                        style="@style/Widget.Material3.Button.TextButton" />
-
-                    <com.google.android.material.button.MaterialButton
-                        android:id="@+id/resticStatsButton"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="统计"
-                        android:visibility="gone"
-                        style="@style/Widget.Material3.Button.TextButton" />
-
-                    <com.google.android.material.button.MaterialButton
-                        android:id="@+id/resticPruneButton"
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="清理"
-                        android:visibility="gone"
-                        style="@style/Widget.Material3.Button.TextButton" />
-                </LinearLayout>
-
-                <TextView
-                    android:id="@+id/resticStatusText"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="8dp"
-                    android:textAppearance="@style/TextAppearance.Material3.BodySmall"
-                    android:textColor="?attr/colorOnSurfaceVariant" />
-
-            </LinearLayout>
-        </com.google.android.material.card.MaterialCardView>
-
-        <com.google.android.material.button.MaterialButton
-            android:id="@+id/saveConfigButton"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginBottom="8dp"
-            android:text="保存配置"
-            style="@style/Widget.Material3.Button" />
-
-        <TextView
-            android:id="@+id/configStatusText"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginBottom="24dp"
-            android:textAppearance="@style/TextAppearance.Material3.BodySmall"
-            android:textColor="?attr/colorOnSurfaceVariant" />
-
-    </LinearLayout>
-</ScrollView>

app/src/main/res/layout/fragment_restore.xml

@@ -1,89 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:padding="16dp"
-    android:background="?attr/colorSurface">
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:gravity="center_vertical"
-        android:orientation="horizontal">
-
-        <TextView
-            android:layout_width="0dp"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="应用恢复"
-            android:textAppearance="@style/TextAppearance.Material3.HeadlineSmall"
-            android:textColor="?attr/colorOnSurface" />
-
-        <com.google.android.material.button.MaterialButton
-            android:id="@+id/selectDirButton"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:text="本地"
-            style="@style/Widget.Material3.Button.TonalButton" />
-
-        <com.google.android.material.button.MaterialButton
-            android:id="@+id/selectResticButton"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_marginStart="8dp"
-            android:text="Restic"
-            android:visibility="gone"
-            style="@style/Widget.Material3.Button.TonalButton" />
-    </LinearLayout>
-
-    <TextView
-        android:id="@+id/backupDirText"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="12dp"
-        android:ellipsize="middle"
-        android:singleLine="true"
-        android:text="未选择备份目录"
-        android:textAppearance="@style/TextAppearance.Material3.BodySmall"
-        android:textColor="?attr/colorOnSurfaceVariant" />
-
-    <com.google.android.material.progressindicator.LinearProgressIndicator
-        android:id="@+id/progressBar"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="8dp"
-        android:indeterminate="true"
-        android:visibility="gone"
-        app:indicatorColor="?attr/colorPrimary"
-        app:trackColor="?attr/colorSurfaceVariant" />
-
-    <TextView
-        android:id="@+id/statusText"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="8dp"
-        android:text="请先选择备份文件夹"
-        android:textAppearance="@style/TextAppearance.Material3.BodySmall"
-        android:textColor="?attr/colorOnSurfaceVariant" />
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/appList"
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1"
-        android:layout_marginTop="12dp"
-        android:clipToPadding="false"
-        android:paddingBottom="8dp" />
-
-    <com.google.android.material.button.MaterialButton
-        android:id="@+id/restoreButton"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="12dp"
-        android:enabled="false"
-        android:text="开始恢复选中应用"
-        style="@style/Widget.Material3.Button" />
-
-</LinearLayout>

app/src/main/res/menu/bottom_nav.xml

@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android">
-    <item
-        android:id="@+id/nav_backup"
-        android:icon="@drawable/ic_backup"
-        android:title="备份" />
-    <item
-        android:id="@+id/nav_restore"
-        android:icon="@drawable/ic_restore"
-        android:title="恢复" />
-    <item
-        android:id="@+id/nav_config"
-        android:icon="@drawable/ic_config"
-        android:title="配置" />
-</menu>

app/src/main/res/values-night/colors.xml

@@ -1,51 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <!-- MD3 Primary (dark) -->
-    <color name="primary">#9ECAFF</color>
-    <color name="onPrimary">#003258</color>
-    <color name="primaryContainer">#00497D</color>
-    <color name="onPrimaryContainer">#D1E4FF</color>
-
-    <!-- MD3 Secondary (dark) -->
-    <color name="secondary">#FFB870</color>
-    <color name="onSecondary">#4A2800</color>
-    <color name="secondaryContainer">#6A3C00</color>
-    <color name="onSecondaryContainer">#FFDCB5</color>
-
-    <!-- MD3 Tertiary (dark) -->
-    <color name="tertiary">#8CD4C4</color>
-    <color name="onTertiary">#00382F</color>
-    <color name="tertiaryContainer">#005045</color>
-    <color name="onTertiaryContainer">#A7F0DE</color>
-
-    <!-- MD3 Error (dark) -->
-    <color name="error">#FFB4AB</color>
-    <color name="onError">#690005</color>
-    <color name="errorContainer">#93000A</color>
-    <color name="onErrorContainer">#FFDAD6</color>
-
-    <!-- MD3 Surface / Background (dark) -->
-    <color name="background">#1A1C1E</color>
-    <color name="onBackground">#E2E2E6</color>
-    <color name="surface">#1A1C1E</color>
-    <color name="onSurface">#E2E2E6</color>
-    <color name="surfaceVariant">#43474E</color>
-    <color name="onSurfaceVariant">#C3C6CF</color>
-    <color name="inverseSurface">#E2E2E6</color>
-    <color name="inverseOnSurface">#2F3033</color>
-
-    <!-- MD3 Outline (dark) -->
-    <color name="outline">#8D9199</color>
-    <color name="outlineVariant">#43474E</color>
-
-    <!-- Surface container hierarchy (dark) -->
-    <color name="surfaceContainerLowest">#0E1114</color>
-    <color name="surfaceContainerLow">#1A1C1E</color>
-    <color name="surfaceContainer">#1E2023</color>
-    <color name="surfaceContainerHigh">#292A2E</color>
-    <color name="surfaceContainerHighest">#333539</color>
-
-    <!-- Legacy console colors -->
-    <color name="consoleBg">#102027</color>
-    <color name="consoleText">#ECEFF1</color>
-</resources>

app/src/main/res/values-night/themes.xml

@@ -1,54 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <style name="AppTheme" parent="Theme.Material3.DayNight.NoActionBar">
-        <!-- Primary -->
-        <item name="colorPrimary">@color/primary</item>
-        <item name="colorOnPrimary">@color/onPrimary</item>
-        <item name="colorPrimaryContainer">@color/primaryContainer</item>
-        <item name="colorOnPrimaryContainer">@color/onPrimaryContainer</item>
-
-        <!-- Secondary -->
-        <item name="colorSecondary">@color/secondary</item>
-        <item name="colorOnSecondary">@color/onSecondary</item>
-        <item name="colorSecondaryContainer">@color/secondaryContainer</item>
-        <item name="colorOnSecondaryContainer">@color/onSecondaryContainer</item>
-
-        <!-- Tertiary -->
-        <item name="colorTertiary">@color/tertiary</item>
-        <item name="colorOnTertiary">@color/onTertiary</item>
-        <item name="colorTertiaryContainer">@color/tertiaryContainer</item>
-        <item name="colorOnTertiaryContainer">@color/onTertiaryContainer</item>
-
-        <!-- Error -->
-        <item name="colorError">@color/error</item>
-        <item name="colorOnError">@color/onError</item>
-        <item name="colorErrorContainer">@color/errorContainer</item>
-        <item name="colorOnErrorContainer">@color/onErrorContainer</item>
-
-        <!-- Surface / Background -->
-        <item name="android:colorBackground">@color/background</item>
-        <item name="colorOnBackground">@color/onBackground</item>
-        <item name="colorSurface">@color/surface</item>
-        <item name="colorOnSurface">@color/onSurface</item>
-        <item name="colorSurfaceVariant">@color/surfaceVariant</item>
-        <item name="colorOnSurfaceVariant">@color/onSurfaceVariant</item>
-        <item name="colorSurfaceInverse">@color/inverseSurface</item>
-        <item name="colorOnSurfaceInverse">@color/inverseOnSurface</item>
-
-        <!-- Outline -->
-        <item name="colorOutline">@color/outline</item>
-        <item name="colorOutlineVariant">@color/outlineVariant</item>
-
-        <!-- Surface container hierarchy -->
-        <item name="colorSurfaceContainerLowest">@color/surfaceContainerLowest</item>
-        <item name="colorSurfaceContainerLow">@color/surfaceContainerLow</item>
-        <item name="colorSurfaceContainer">@color/surfaceContainer</item>
-        <item name="colorSurfaceContainerHigh">@color/surfaceContainerHigh</item>
-        <item name="colorSurfaceContainerHighest">@color/surfaceContainerHighest</item>
-
-        <!-- Status bar — dark theme -->
-        <item name="android:statusBarColor">@android:color/transparent</item>
-        <item name="android:navigationBarColor">@android:color/transparent</item>
-        <item name="android:windowLightStatusBar">false</item>
-    </style>
-</resources>

app/src/main/res/values/colors.xml

@@ -1,51 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <!-- MD3 Primary — deep blue -->
-    <color name="primary">#1565C0</color>
-    <color name="onPrimary">#FFFFFF</color>
-    <color name="primaryContainer">#D1E4FF</color>
-    <color name="onPrimaryContainer">#001D36</color>
-
-    <!-- MD3 Secondary — amber accent -->
-    <color name="secondary">#FF8F00</color>
-    <color name="onSecondary">#FFFFFF</color>
-    <color name="secondaryContainer">#FFDCB5</color>
-    <color name="onSecondaryContainer">#2D1800</color>
-
-    <!-- MD3 Tertiary — teal -->
-    <color name="tertiary">#00796B</color>
-    <color name="onTertiary">#FFFFFF</color>
-    <color name="tertiaryContainer">#A7F0DE</color>
-    <color name="onTertiaryContainer">#001F19</color>
-
-    <!-- MD3 Error -->
-    <color name="error">#BA1A1A</color>
-    <color name="onError">#FFFFFF</color>
-    <color name="errorContainer">#FFDAD6</color>
-    <color name="onErrorContainer">#410002</color>
-
-    <!-- MD3 Surface / Background (light) -->
-    <color name="background">#FDFCFF</color>
-    <color name="onBackground">#1A1C1E</color>
-    <color name="surface">#FDFCFF</color>
-    <color name="onSurface">#1A1C1E</color>
-    <color name="surfaceVariant">#DFE2EB</color>
-    <color name="onSurfaceVariant">#43474E</color>
-    <color name="inverseSurface">#2F3033</color>
-    <color name="inverseOnSurface">#F1F0F4</color>
-
-    <!-- MD3 Outline -->
-    <color name="outline">#73777F</color>
-    <color name="outlineVariant">#C3C6CF</color>
-
-    <!-- Surface container hierarchy (light) -->
-    <color name="surfaceContainerLowest">#FFFFFF</color>
-    <color name="surfaceContainerLow">#F7F9FC</color>
-    <color name="surfaceContainer">#F1F3F7</color>
-    <color name="surfaceContainerHigh">#EBEDF1</color>
-    <color name="surfaceContainerHighest">#E6E8EB</color>
-
-    <!-- Legacy console colors -->
-    <color name="consoleBg">#263238</color>
-    <color name="consoleText">#ECEFF1</color>
+    <color name="primary">#FF1A6B52</color>
+    <color name="white">#FFFFFFFF</color>
 </resources>

app/src/main/res/values/ids.xml

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <item name="checkbox" type="id" />
-    <item name="appName" type="id" />
-</resources>

app/src/main/res/values/strings.xml

@@ -13,4 +13,5 @@
     <string name="status_done">完成 (退出码: %d)</string>
     <string name="status_error">执行失败: %s</string>
     <string name="status_cancelled">已取消</string>
+    <string name="exclude_data_toggle">切换数据排除</string>
 </resources>

app/src/main/res/values/themes.xml

@@ -1,55 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <style name="AppTheme" parent="Theme.Material3.DayNight.NoActionBar">
-        <!-- Primary -->
-        <item name="colorPrimary">@color/primary</item>
-        <item name="colorOnPrimary">@color/onPrimary</item>
-        <item name="colorPrimaryContainer">@color/primaryContainer</item>
-        <item name="colorOnPrimaryContainer">@color/onPrimaryContainer</item>
-        <item name="colorPrimaryInverse">@color/inverseSurface</item>
-
-        <!-- Secondary -->
-        <item name="colorSecondary">@color/secondary</item>
-        <item name="colorOnSecondary">@color/onSecondary</item>
-        <item name="colorSecondaryContainer">@color/secondaryContainer</item>
-        <item name="colorOnSecondaryContainer">@color/onSecondaryContainer</item>
-
-        <!-- Tertiary -->
-        <item name="colorTertiary">@color/tertiary</item>
-        <item name="colorOnTertiary">@color/onTertiary</item>
-        <item name="colorTertiaryContainer">@color/tertiaryContainer</item>
-        <item name="colorOnTertiaryContainer">@color/onTertiaryContainer</item>
-
-        <!-- Error -->
-        <item name="colorError">@color/error</item>
-        <item name="colorOnError">@color/onError</item>
-        <item name="colorErrorContainer">@color/errorContainer</item>
-        <item name="colorOnErrorContainer">@color/onErrorContainer</item>
-
-        <!-- Surface / Background -->
-        <item name="android:colorBackground">@color/background</item>
-        <item name="colorOnBackground">@color/onBackground</item>
-        <item name="colorSurface">@color/surface</item>
-        <item name="colorOnSurface">@color/onSurface</item>
-        <item name="colorSurfaceVariant">@color/surfaceVariant</item>
-        <item name="colorOnSurfaceVariant">@color/onSurfaceVariant</item>
-        <item name="colorSurfaceInverse">@color/inverseSurface</item>
-        <item name="colorOnSurfaceInverse">@color/inverseOnSurface</item>
-
-        <!-- Outline -->
-        <item name="colorOutline">@color/outline</item>
-        <item name="colorOutlineVariant">@color/outlineVariant</item>
-
-        <!-- Surface container hierarchy -->
-        <item name="colorSurfaceContainerLowest">@color/surfaceContainerLowest</item>
-        <item name="colorSurfaceContainerLow">@color/surfaceContainerLow</item>
-        <item name="colorSurfaceContainer">@color/surfaceContainer</item>
-        <item name="colorSurfaceContainerHigh">@color/surfaceContainerHigh</item>
-        <item name="colorSurfaceContainerHighest">@color/surfaceContainerHighest</item>
-
-        <!-- Status bar -->
-        <item name="android:statusBarColor">@android:color/transparent</item>
-        <item name="android:navigationBarColor">@android:color/transparent</item>
-        <item name="android:windowLightStatusBar">true</item>
-    </style>
+    <!-- Minimal theme for AndroidManifest (UI theme managed by Compose) -->
+    <style name="AppTheme" parent="Theme.Material3.DayNight.NoActionBar" />
 </resources>

app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<data-extraction-rules>
+    <cloud-backup>
+        <include domain="file" path="."/>
+    </cloud-backup>
+    <device-transfer>
+        <include domain="file" path="."/>
+    </device-transfer>
+</data-extraction-rules>

app/src/test/java/android/util/Log.java

@@ -0,0 +1,23 @@
+package android.util;
+
+/**
+ * Test-only stub for android.util.Log.
+ * Prevents RuntimeException("Stub!") from android.jar during JVM unit tests.
+ */
+public final class Log {
+    public static int v(String tag, String msg) { return 0; }
+    public static int v(String tag, String msg, Throwable tr) { return 0; }
+    public static int d(String tag, String msg) { return 0; }
+    public static int d(String tag, String msg, Throwable tr) { return 0; }
+    public static int i(String tag, String msg) { return 0; }
+    public static int i(String tag, String msg, Throwable tr) { return 0; }
+    public static int w(String tag, String msg) { return 0; }
+    public static int w(String tag, String msg, Throwable tr) { return 0; }
+    public static int e(String tag, String msg) { return 0; }
+    public static int e(String tag, String msg, Throwable tr) { return 0; }
+    public static int wtf(String tag, String msg) { return 0; }
+    public static int wtf(String tag, String msg, Throwable tr) { return 0; }
+    public static String getStackTraceString(Throwable tr) { return ""; }
+    public static boolean isLoggable(String tag, int level) { return false; }
+    public static int println(int priority, String tag, String msg) { return 0; }
+}

app/src/test/java/com/example/androidbackupgui/backup/AppErrorTest.kt

@@ -0,0 +1,273 @@
+package com.example.androidbackupgui.backup
+
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.nulls.shouldBeNull
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.types.shouldBeInstanceOf
+import io.kotest.property.Arb
+import io.kotest.property.arbitrary.int
+import io.kotest.property.arbitrary.string
+import io.kotest.property.checkAll
+import java.io.IOException
+
+class AppErrorTest : FunSpec({
+
+    context("AppError.Network") {
+        test("has correct defaults") {
+            val error = AppError.Network("connection timeout")
+            error.message shouldBe "connection timeout"
+            error.cause.shouldBeNull()
+            error.retryable shouldBe true
+        }
+
+        test("preserves cause and retryable overrides") {
+            val cause = RuntimeException("DNS failed")
+            val error = AppError.Network("DNS resolution failed", cause = cause, retryable = false)
+            error.cause shouldBe cause
+            error.retryable shouldBe false
+        }
+
+        test("property: message is preserved") {
+            checkAll(Arb.string(1..200)) { msg ->
+                val error = AppError.Network(msg)
+                error.message shouldBe msg
+            }
+        }
+    }
+
+    context("AppError.Remote") {
+        test("preserves phase, cause, isNotFound, retryable") {
+            val cause = RuntimeException("underlying error")
+            val error = AppError.Remote("upload failed", "upload", cause = cause)
+            error.message shouldBe "upload failed"
+            error.phase shouldBe "upload"
+            error.cause shouldBe cause
+            error.isNotFound shouldBe false
+            error.retryable shouldBe false
+        }
+
+        test("with isNotFound=true") {
+            val error = AppError.Remote("not found", "list", isNotFound = true)
+            error.isNotFound shouldBe true
+        }
+    }
+
+    context("AppError.Shell") {
+        test("preserves command, exitCode, and stderr") {
+            val error = AppError.Shell("cp failed", "cp /a /b", 1, "permission denied")
+            error.message shouldBe "cp failed"
+            error.command shouldBe "cp /a /b"
+            error.exitCode shouldBe 1
+            error.stderr shouldBe "permission denied"
+        }
+    }
+
+    context("AppError.LocalIO") {
+        test("preserves path and optional cause") {
+            val error = AppError.LocalIO("file not found", "/data/test.txt")
+            error.message shouldBe "file not found"
+            error.path shouldBe "/data/test.txt"
+            error.cause.shouldBeNull()
+        }
+
+        test("preserves cause when provided") {
+            val cause = IOException("disk full")
+            val error = AppError.LocalIO("write failed", "/data/test.txt", cause = cause)
+            error.cause shouldBe cause
+        }
+    }
+
+    context("AppError.Restic") {
+        test("preserves exit code and stderr") {
+            val error = AppError.Restic("restic failed", 1, "permission denied")
+            error.message shouldBe "restic failed"
+            error.exitCode shouldBe 1
+            error.stderr shouldBe "permission denied"
+        }
+
+        test("property: any exit code is preserved") {
+            checkAll(Arb.int()) { code ->
+                val error = AppError.Restic("err", code, "stderr output")
+                error.exitCode shouldBe code
+            }
+        }
+    }
+
+    context("AppError.Parse") {
+        test("preserves message and detail") {
+            val error = AppError.Parse("bad json", "expected '{'")
+            error.message shouldBe "bad json"
+            error.detail shouldBe "expected '{'"
+        }
+
+        test("detail defaults to empty string") {
+            val error = AppError.Parse("bad json")
+            error.detail shouldBe ""
+        }
+    }
+
+    context("AppError.Cancelled") {
+        test("is a data object with fixed message") {
+            val error = AppError.Cancelled
+            error.message shouldBe "操作被取消"
+            // Verify singleton behavior
+            val error2 = AppError.Cancelled
+            error shouldBe error2
+        }
+    }
+
+    context("AppResult.Success") {
+        test("holds a value") {
+            val result: AppResult<String> = AppResult.Success("hello")
+            result.isSuccess shouldBe true
+            result.isFailure shouldBe false
+            result.getOrNull() shouldBe "hello"
+            result.getOrDefault("fallback") shouldBe "hello"
+            result.getOrThrow() shouldBe "hello"
+            result.exceptionOrNull().shouldBeNull()
+            result.errorOrNull().shouldBeNull()
+        }
+
+        test("fold calls onSuccess") {
+            val result: AppResult<Int> = AppResult.Success(42)
+            val folded =
+                result.fold(
+                    onSuccess = { it * 2 },
+                    onFailure = { 0 },
+                )
+            folded shouldBe 84
+        }
+
+        test("map transforms value") {
+            val result: AppResult<Int> = AppResult.Success(42)
+            val mapped = result.map { it.toString() }
+            mapped shouldBe AppResult.Success("42")
+        }
+
+        test("mapError passes through success") {
+            val result: AppResult<Int> = AppResult.Success(42)
+            val mapped = result.mapError { AppError.Parse("should not happen") }
+            mapped shouldBe AppResult.Success(42)
+        }
+    }
+
+    context("AppResult.Failure via err()") {
+        test("creates failure result") {
+            val result: AppResult<String> = err(AppError.Parse("bad json"))
+            result.isSuccess shouldBe false
+            result.isFailure shouldBe true
+            result.getOrNull().shouldBeNull()
+            result.getOrDefault("fallback") shouldBe "fallback"
+            result.errorOrNull() shouldBe AppError.Parse("bad json")
+            result.errorOrNull()?.message shouldBe "bad json"
+        }
+
+        test("exceptionOrNull returns RuntimeException with AppError message") {
+            val result: AppResult<String> = err(AppError.Parse("bad json"))
+            val ex = result.exceptionOrNull()
+            ex.shouldBeInstanceOf<RuntimeException>()
+            ex?.message shouldBe "bad json"
+        }
+
+        test("getOrThrow throws RuntimeException") {
+            val result: AppResult<String> = err(AppError.Parse("bad json"))
+            val ex = shouldThrow<RuntimeException> { result.getOrThrow() }
+            ex.message shouldBe "bad json"
+        }
+
+        test("wraps any AppError subtype") {
+            val errors =
+                listOf(
+                    AppError.Network("net err"),
+                    AppError.Remote("remote err", "connect"),
+                    AppError.Shell("shell err", "ls", 1, ""),
+                    AppError.LocalIO("io err", "/tmp"),
+                    AppError.Restic("restic err", 1, ""),
+                    AppError.Parse("parse err"),
+                    AppError.Cancelled,
+                )
+            errors.forEach { error ->
+                val result: AppResult<Unit> = err(error)
+                result.isFailure shouldBe true
+                result.errorOrNull()?.message shouldBe error.message
+            }
+        }
+    }
+
+    context("AppResult.Failure direct") {
+        test("holds an error") {
+            val error = AppError.Network("network error")
+            val result: AppResult<String> = AppResult.Failure(error)
+            result.isSuccess shouldBe false
+            result.isFailure shouldBe true
+            result.errorOrNull() shouldBe error
+        }
+
+        test("fold calls onFailure") {
+            val result: AppResult<Int> = AppResult.Failure(AppError.Parse("parse failed"))
+            val folded =
+                result.fold(
+                    onSuccess = { 0 },
+                    onFailure = { error -> error.message.length },
+                )
+            folded shouldBe "parse failed".length
+        }
+
+        test("map passes through failure") {
+            val error = AppError.Parse("no data")
+            val result: AppResult<Int> = AppResult.Failure(error)
+            val mapped = result.map { it + 1 }
+            mapped shouldBe AppResult.Failure(error)
+        }
+
+        test("mapError transforms error") {
+            val result: AppResult<Int> = AppResult.Failure(AppError.Parse("old error"))
+            val mapped = result.mapError { AppError.Remote("mapped: ${it.message}", "transform") }
+            mapped.errorOrNull()?.message shouldBe "mapped: old error"
+        }
+    }
+
+    context("AppResult exhaustive when") {
+        test("can pattern match with is AppResult.Success") {
+            val result: AppResult<String> = AppResult.Success("data")
+            val output =
+                when (result) {
+                    is AppResult.Success -> "got: ${result.data}"
+                    is AppResult.Failure -> "err: ${result.error.message}"
+                }
+            output shouldBe "got: data"
+        }
+
+        test("can pattern match with is AppResult.Failure") {
+            val result: AppResult<String> = AppResult.Failure(AppError.Cancelled)
+            val output =
+                when (result) {
+                    is AppResult.Success -> "got: ${result.data}"
+                    is AppResult.Failure -> "err: ${result.error.message}"
+                }
+            output shouldBe "err: 操作被取消"
+        }
+    }
+
+    context("AppResult type inference") {
+        test("AppResult.Success with Unit") {
+            val result: AppResult<Unit> = AppResult.Success(Unit)
+            result.isSuccess shouldBe true
+            result.getOrDefault(Unit) shouldBe Unit
+        }
+
+        test("AppResult.Failure with Nothing") {
+            val result: AppResult<Int> = AppResult.Failure(AppError.Cancelled)
+            result.isFailure shouldBe true
+        }
+    }
+
+    context("err function short-form") {
+        test("err() returns AppResult.Failure") {
+            val result: AppResult<String> = err(AppError.Remote("upload failed", "upload"))
+            result.shouldBeInstanceOf<AppResult.Failure>()
+            (result as AppResult.Failure).error shouldBe AppError.Remote("upload failed", "upload")
+        }
+    }
+})

app/src/test/java/com/example/androidbackupgui/backup/AppResultTest.kt

@@ -0,0 +1,88 @@
+package com.example.androidbackupgui.backup
+
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.nulls.shouldBeNull
+import io.kotest.matchers.nulls.shouldNotBeNull
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.types.shouldBeInstanceOf
+
+class AppResultTest :
+    FunSpec({
+
+        context("AppResult.Success") {
+            test("holds value correctly") {
+                val result: AppResult<String> = AppResult.Success("hello")
+                result.isSuccess shouldBe true
+                result.isFailure shouldBe false
+                result.getOrNull() shouldBe "hello"
+                result.getOrDefault("default") shouldBe "hello"
+            }
+
+            test("fold maps success branch") {
+                val result: AppResult<Int> = AppResult.Success(42)
+                val output = result.fold({ it * 2 }, { -1 })
+                output shouldBe 84
+            }
+
+            test("map transforms value") {
+                val result = AppResult.Success(42)
+                val mapped = result.map { it.toString() }
+                mapped.shouldBeInstanceOf<AppResult.Success<String>>()
+                mapped.getOrNull() shouldBe "42"
+            }
+
+            test("getOrThrow returns value") {
+                val result = AppResult.Success(99)
+                result.getOrThrow() shouldBe 99
+            }
+        }
+
+        context("AppResult.Failure") {
+            val error = AppError.Network("connection lost")
+
+            test("holds error correctly") {
+                val result: AppResult<Int> = AppResult.Failure(error)
+                result.isSuccess shouldBe false
+                result.isFailure shouldBe true
+                result.getOrNull().shouldBeNull()
+                result.getOrDefault(0) shouldBe 0
+                result.errorOrNull() shouldBe error
+            }
+
+            test("fold maps failure branch") {
+                val result: AppResult<Int> = AppResult.Failure(error)
+                val output = result.fold({ it }, { err -> -1 })
+                output shouldBe -1
+            }
+
+            test("map passes through failure") {
+                val result: AppResult<Int> = AppResult.Failure(error)
+                val mapped = result.map { it * 2 }
+                mapped.shouldBeInstanceOf<AppResult.Failure>()
+                mapped.errorOrNull() shouldBe error
+            }
+
+            test("getOrThrow throws") {
+                val result = AppResult.Failure(error)
+                shouldThrow<RuntimeException> { result.getOrThrow() }
+            }
+
+            test("mapError transforms the error") {
+                val result: AppResult<Int> = AppResult.Failure(error)
+                val mapped = result.mapError { AppError.Parse("wrapped: ${it.message}") }
+                mapped.shouldBeInstanceOf<AppResult.Failure>()
+                (mapped.errorOrNull() as? AppError.Parse)?.let {
+                    it.message shouldBe "wrapped: connection lost"
+                }
+            }
+        }
+
+        context("err helper") {
+            test("creates Failure") {
+                val result = err<String>(AppError.Cancelled)
+                result.shouldBeInstanceOf<AppResult.Failure>()
+                result.errorOrNull() shouldBe AppError.Cancelled
+            }
+        }
+    })

app/src/test/java/com/example/androidbackupgui/backup/BackupConfigTest.kt

@@ -0,0 +1,44 @@
+package com.example.androidbackupgui.backup
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import java.io.File
+
+class BackupConfigTest :
+    FunSpec({
+
+        // Helper: write config to temp file, read it back
+        fun roundTrip(config: BackupConfig): BackupConfig {
+            val tmp = File.createTempFile("cfg_test", ".conf")
+            try {
+                BackupConfig.toFile(config, tmp)
+                return BackupConfig.fromFile(tmp)
+            } finally {
+                tmp.delete()
+            }
+        }
+
+        test("password is stored as placeholder (actual password in PasswordManager)") {
+            val c = BackupConfig(resticPassword = "simple123")
+            // Password is no longer in config file; toFile writes "stored-in-keystore"
+            roundTrip(c).resticPassword shouldBe ""
+        }
+
+        test("backend pass is stored as placeholder (actual pass in PasswordManager)") {
+            val c = BackupConfig(resticBackendPass = "secret")
+            roundTrip(c).resticBackendPass shouldBe ""
+        }
+
+        test("output path with spaces survives round trip") {
+            val c = BackupConfig(outputPath = "/sdcard/my backups/")
+            roundTrip(c).outputPath shouldBe "/sdcard/my backups/"
+        }
+
+        test("non-restic fields are unaffected") {
+            val c = BackupConfig(backupMode = 1, backupWifi = 0, compressionMethod = "zstd")
+            val out = roundTrip(c)
+            out.backupMode shouldBe 1
+            out.backupWifi shouldBe 0
+            out.compressionMethod shouldBe "zstd"
+        }
+    })

app/src/test/java/com/example/androidbackupgui/backup/PackageNameTest.kt

@@ -0,0 +1,69 @@
+package com.example.androidbackupgui.backup
+
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.nulls.shouldBeNull
+import io.kotest.matchers.nulls.shouldNotBeNull
+import io.kotest.matchers.shouldBe
+
+class PackageNameTest :
+    FunSpec({
+
+        context("PackageName constructor validation") {
+            test("accepts valid package names") {
+                PackageName("com.example.app").value shouldBe "com.example.app"
+                PackageName("com.google.android.gms").value shouldBe "com.google.android.gms"
+                PackageName("a.b").value shouldBe "a.b"
+                PackageName("com.example.app_v2.test").value shouldBe "com.example.app_v2.test"
+                PackageName("org.koin.android").value shouldBe "org.koin.android"
+            }
+
+            test("rejects blank package names") {
+                shouldThrow<IllegalArgumentException> { PackageName("") }
+                shouldThrow<IllegalArgumentException> { PackageName("  ") }
+            }
+
+            test("rejects package names without dots") {
+                shouldThrow<IllegalArgumentException> { PackageName("simple") }
+                shouldThrow<IllegalArgumentException> { PackageName("no_dot_at_all") }
+            }
+
+            test("rejects package names with invalid characters") {
+                shouldThrow<IllegalArgumentException> { PackageName("com.example .app") }
+                shouldThrow<IllegalArgumentException> { PackageName("com.example/app") }
+                shouldThrow<IllegalArgumentException> { PackageName("com.example\napp") }
+            }
+
+            test("rejects package names starting with dot") {
+                shouldThrow<IllegalArgumentException> { PackageName(".com.example") }
+            }
+
+            test("rejects package names ending with dot") {
+                shouldThrow<IllegalArgumentException> { PackageName("com.example.") }
+            }
+        }
+
+        context("PackageName.safe") {
+            test("returns PackageName for valid input") {
+                PackageName.safe("com.example.app").shouldNotBeNull()
+                PackageName.safe("a.b").shouldNotBeNull()
+            }
+
+            test("returns null for invalid input instead of throwing") {
+                PackageName.safe("").shouldBeNull()
+                PackageName.safe("no_dots").shouldBeNull()
+                PackageName.safe("with space").shouldBeNull()
+                PackageName.safe("with/slash").shouldBeNull()
+            }
+        }
+
+        context("PackageName equality and toString") {
+            test("value equality works") {
+                PackageName("com.example.app") shouldBe PackageName("com.example.app")
+            }
+
+            test("toString returns the package name") {
+                PackageName("com.example.app").toString() shouldBe "com.example.app"
+            }
+        }
+    })

app/src/test/java/com/example/androidbackupgui/backup/ResticBinaryTest.kt

@@ -0,0 +1,13 @@
+package com.example.androidbackupgui.backup
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+
+class ResticBinaryTest : FunSpec({
+
+    context("ResticBinary") {
+        test("isReady returns false before prepare is called") {
+            ResticBinary.isReady() shouldBe false
+        }
+    }
+})

app/src/test/java/com/example/androidbackupgui/backup/ResticCommandRunnerTest.kt

@@ -0,0 +1,110 @@
+package com.example.androidbackupgui.backup
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.collections.shouldHaveSize
+import io.kotest.matchers.shouldBe
+import io.kotest.property.Arb
+import io.kotest.property.arbitrary.int
+import io.kotest.property.arbitrary.list
+import io.kotest.property.arbitrary.string
+import io.kotest.property.checkAll
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+
+class ResticCommandRunnerTest : FunSpec({
+
+    val defaultRunner = ResticCommandRunner()
+
+    context("buildCommandArgs") {
+        test("prepends default binary path") {
+            val args = defaultRunner.buildCommandArgs(listOf("init", "--json"))
+            args shouldBe listOf("restic", "init", "--json")
+        }
+
+        test("uses custom binary path") {
+            val runner = ResticCommandRunner()
+            runner.binaryPath = "/data/data/com.termux/files/usr/bin/restic"
+            val args = runner.buildCommandArgs(listOf("backup", "/sdcard"))
+            args shouldBe
+                listOf(
+                    "/data/data/com.termux/files/usr/bin/restic",
+                    "backup",
+                    "/sdcard",
+                )
+        }
+
+        test("returns empty args list when called with empty list") {
+            val args = defaultRunner.buildCommandArgs(emptyList())
+            args shouldBe listOf("restic")
+        }
+
+        test("preserves argument order") {
+            val runner = ResticCommandRunner()
+            runner.binaryPath = "restic"
+            val args = runner.buildCommandArgs(listOf("a", "b", "c"))
+            args shouldBe listOf("restic", "a", "b", "c")
+        }
+
+        test("property: any list of string args mainatains length") {
+            checkAll(Arb.list(Arb.string(1..20), 0..10)) { inputArgs ->
+                val args = defaultRunner.buildCommandArgs(inputArgs)
+                args shouldHaveSize (inputArgs.size + 1)
+                args[0] shouldBe "restic"
+            }
+        }
+    }
+
+    context("runRestic(vararg)") {
+        test("delegates to runRestic(List) and returns failure on nonexistent binary") {
+            val runner = ResticCommandRunner()
+            runner.binaryPath = "/nonexistent/restic"
+            val result = runner.runRestic(mapOf("RESTIC_REPOSITORY" to "/tmp/repo"), "version")
+            result.exitCode shouldBe -1
+            result.stdout shouldBe ""
+        }
+    }
+
+    context("CommandResult serialization") {
+        test("serializes and deserializes correctly") {
+            val original =
+                ResticCommandRunner.CommandResult(
+                    stdout = "some output",
+                    stderr = "",
+                    exitCode = 0,
+                )
+            val json = Json.encodeToString(original)
+            val decoded = Json.decodeFromString<ResticCommandRunner.CommandResult>(json)
+            decoded.stdout shouldBe "some output"
+            decoded.stderr shouldBe ""
+            decoded.exitCode shouldBe 0
+        }
+
+        test("roundtrip property: preserves exit code") {
+            checkAll(Arb.int()) { code ->
+                val original =
+                    ResticCommandRunner.CommandResult(
+                        stdout = "out",
+                        stderr = code.toString(),
+                        exitCode = code,
+                    )
+                val json = Json.encodeToString(original)
+                val decoded = Json.decodeFromString<ResticCommandRunner.CommandResult>(json)
+                decoded.exitCode shouldBe code
+                decoded.stderr shouldBe code.toString()
+            }
+        }
+    }
+
+    context("ResticCommandRunner instantiation") {
+        test("default binary path is restic") {
+            defaultRunner.binaryPath shouldBe "restic"
+        }
+
+        test("can set custom binary path") {
+            val runner = ResticCommandRunner()
+            runner.binaryPath = "/custom/path/restic"
+            runner.binaryPath shouldBe "/custom/path/restic"
+        }
+    }
+})

build.gradle

@@ -4,8 +4,10 @@ buildscript {
     repositories {
         google()
         mavenCentral()
+        gradlePluginPortal()
     }
     dependencies {
+        classpath "org.jetbrains.kotlinx:kover-gradle-plugin:0.9.8"
         classpath 'com.android.tools.build:gradle:8.2.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"

docs/plans/roadmap.md

@@ -0,0 +1,88 @@
+# Android Backup GUI — 后续路线图
+
+## 已完成（当前版本）
+
+| 领域 | 变更 | 阶段 |
+|------|------|------|
+| 🔒 安全 | 配置文件权限加固、签名密码加固 | P1 |
+| 🔒 安全 | SMB MD4/AESCMAC 算法注入修复 + 全局注册 | Hotfix |
+| 🐛 正确性 | `CancellationException` 透传 × 8 处 | P2 |
+| 🐛 正确性 | SMB/WebDAV 返回 `Failure` 而非 `Success` | P2 |
+| 🐛 正确性 | `BackupOperation.backupUserData` 全失败返回 `false` | P2 |
+| 🐛 正确性 | `RestoreOperation` 改用 `supervisorScope` | P2 |
+| 🐛 正确性 | `ResticCommandRunner` NPE 修复（2 处 readLine 模式） | Hotfix |
+| 🌐 网络 | SMB/WebDAV 下载/上传自动重试 3 次 + 指数退避 | Hotfix |
+| 🌐 网络 | WebDAV Range 断点续传（`.part` 文件 + HTTP Range） | Hotfix |
+| 🏗️ 构建 | ResticRestBridge 绑定 127.0.0.1 | P3 |
+| 🏗️ 构建 | `allowBackup=false` | P3 |
+| 🏗️ 构建 | CI 添加 test 步骤 | P3 |
+| 🧹 清理 | 删除 `MD4Provider.kt`、3 个死方法、`DataSizes`、`isFileNotFound`、`getAppLabel` | P4 |
+
+---
+
+## 下一阶段规划
+
+### Phase A: 稳定性与恢复可靠性（3-5 天）
+
+| # | 工作 | 文件 | 说明 | 风险 |
+|---|------|------|------|------|
+| A1 | 恢复操作 Fragment 修复 | `RestoreFragment.kt` | 添加 `onDestroyView` 防止视图分离后更新 UI | 低 |
+| A2 | BackupFragment 修复 | `BackupFragment.kt` | 添加 `onDestroyView`，清理协程 | 低 |
+| A3 | ResticRestBridge 认证 | `ResticRestBridge.kt` | 添加 token 认证，防止端口暴露 | 低 |
+| A4 | WebDAV 超时可配置 | `WebdavTransport.kt` | Sardine 连接/读取超时通过构造参数设置 | 低 |
+| A5 | tar 路径遍历检查 | `SELinuxUtil.kt` | `isArchiveSafe` 添加绝对路径检查 | 低 |
+| A6 | 恢复后缓存清理 | `ResticRestBridge.kt` | restore 完成后清理 `restic_blob_*` 缓存文件 | 低 |
+
+### Phase B: 遗留死代码与重构（2-3 天）
+
+| # | 工作 | 文件 | 说明 | 风险 |
+|---|------|------|------|------|
+| B1 | 冗余导入清理 | 7 个文件 | 同包 `import` 冗余 | 低 |
+| B2 | 未使用导入清理 | 5 个文件 | 删除无引用 import | 低 |
+| B3 | 未使用参数清理 | 3 个函数 | 删除 `@Suppress("UNUSED_PARAMETER")` | 低 |
+| B4 | TAG 修复 | `ResticRepoInit.kt`, `ResticCommandRunner.kt` | TAG 变量改为类名 | 低 |
+| B5 | UID 解析提取 | `BackupOperation.kt`, `StreamingBackup.kt` | 重复的 UID 解析逻辑提取公共函数 | 低 |
+| B6 | 5 个子模块重复分支提取 | `ResticBackup.kt` 等 | if-else local/remote 分支模式提取公共执行函数 | 中 |
+
+### Phase C: 功能增强（5-7 天）
+
+| # | 工作 | 文件 | 说明 | 风险 |
+|---|------|------|------|------|
+| C1 | 多目录恢复选择 | `RestoreFragment.kt` | 让用户选择从哪个 snapshot 恢复哪些目录 | 中 |
+| C2 | 前台服务 | `BackupService.kt` | 备份/恢复时启动前台服务防止杀进程 | 中 |
+| C3 | 多用户支持 | 全局 | `userId` 参数全面传递到 restore 流程 | 中 |
+| C4 | 恢复进度细化 | `RestoreOperation.kt` | 每 blob 粒度进度回调 | 低 |
+
+### Phase D: 安全加固（3-4 天）
+
+| # | 工作 | 文件 | 说明 | 风险 |
+|---|------|------|------|------|
+| D1 | 密码加密存储 | `BackupConfig.kt` | EncryptedSharedPreferences + 迁移现有配置 | 中 |
+| D2 | 仓库密码 UI 掩码 | `ConfigFragment.kt` | 确认/二次输入 | 低 |
+
+### Phase E: 类型安全（大重构，2-3 天）
+
+| # | 工作 | 文件 | 说明 | 风险 |
+|---|------|------|------|------|
+| E1 | `PackageName` 全面采用 | 8+ 文件 | 函数参数 `String` → `PackageName` | 高 |
+| E2 | `UserId` 全面采用 | 8+ 文件 | 函数参数 `String`/`Int` → `UserId` | 高 |
+
+### Phase F: i18n 国际化（2-3 天）
+
+| # | 工作 | 文件 | 说明 | 风险 |
+|---|------|------|------|------|
+| F1 | strings.xml 提取 | 所有 UI 文件 | 将硬编码中文提取到 strings.xml | 低 |
+| F2 | en/ 翻译 | strings.xml | 英文 strings.xml | 低 |
+
+---
+
+## 建议执行顺序
+
+1. **Phase A**（稳定性优先 — 当前测试中暴露的问题优先修）
+2. **Phase B**（清理干净再动大重构）
+3. **Phase C**（用户可见功能）
+4. **Phase D**（安全加固）
+5. **Phase E**（类型安全 — 大重构，和 C 可能有冲突）
+6. **Phase F**（最后做，纯文案）
+
+**Phase A + B 可并行执行**。

docs/reviews/full-project-review-report.md

@@ -0,0 +1,247 @@
+# Android Backup GUI — 全面审查报告
+
+**审查日期**: 2026-06-06  
+**审查范围**: 37 个 Kotlin 源文件 + 8 个布局/资源 XML + AndroidManifest  
+**当前状态**: 53 测试全通过，lint 0 错误，编译成功  
+**已知问题排除**: 7 项 memory 记录的待处理项已跳过  
+
+---
+
+## 严重程度说明
+
+| 等级 | 定义 |
+|------|------|
+| **CRITICAL** | 可直接导致数据泄露、root 提权、静默数据损坏。必须立即修复 |
+| **HIGH** | 特定条件下可导致敏感数据泄露、错误处理失效或功能严重受限 |
+| **MEDIUM** | 风险较低或需复杂攻击链，但应规划修复 |
+| **LOW** | 可改进点，非阻塞 |
+| **INFO** | 建议性质，无实际风险 |
+
+---
+
+## 审查方法
+
+使用 11 个 ECC 审查技能分三层并行执行：
+
+| 层级 | 技能 | 方向 |
+|------|------|------|
+| 第一层：安全与正确性 | ecc-security-reviewer, security-review, ecc-silent-failure-hunter | 漏洞检测、输入校验、静默失败 |
+| 第二层：架构与代码质量 | ecc-kotlin-reviewer, kotlin-coroutines-flows, ecc-type-design-analyzer, production-audit | 协程安全、类型设计、生产就绪 |
+| 第三层：可维护性与用户体验 | ecc-comment-analyzer, ecc-refactor-cleaner, ecc-code-simplifier, accessibility | 死代码、简化、无障碍 |
+
+---
+
+## 发现汇总
+
+| 层级 | 技能 | CRITICAL | HIGH | MEDIUM | LOW/INFO | 总计 |
+|------|------|----------|------|--------|----------|------|
+| 第一层 | 安全审查 | 2 | 2 | 5 | 3 | 12 |
+| 第一层 | OWASP 安全审查 | 0 | 4 | 6 | 11 | 21 |
+| 第一层 | 静默失败审查 | 0 | 4 | 12 | 9 | 25 |
+| 第二层 | Kotlin 代码审查 | 0 | 1 | 6 | 19 | 26 |
+| 第二层 | 协程/Flow 审查 | 0 | 2 | 4 | 5 | 11 |
+| 第二层 | 类型设计审查 | 0 | 2 | 8 | 6 | 16 |
+| 第二层 | 生产就绪审查 | 0 | 4 | 10 | 4 | 18 |
+| 第三层 | 注释审查 | 0 | 0 | 2 | 4 | 6 |
+| 第三层 | 死代码清理 | 0 | 4 | 4 | 4 | 12 |
+| 第三层 | 代码简化 | 0 | 2 | 7 | 10 | 19 |
+| 第三层 | 无障碍审查 | 1 | 4 | 8 | 2 | 15 |
+| | **合计** | **3** | **29** | **72** | **77** | **181** |
+
+---
+
+## 顶层 CRITICAL 问题（必须立即修复）
+
+### C1. 凭据明文存储在配置文件中
+
+**文件**: `BackupConfig.kt:69,73,156-157`  
+**类型**: Secret 泄露
+
+restic 密码和 SMB/WebDAV 凭据以明文写入 `backup_settings.conf`，位于 `filesDir`。root 环境下，任何进程可读取。UI 中密码字段也未使用 `inputType="textPassword"`。
+
+**建议**: 使用 `EncryptedSharedPreferences`，UI 使用密码掩码输入框。
+
+### C2. 配置文件写入权限不安全
+
+**文件**: `BackupConfig.kt:~144`  
+**类型**: 权限滥用
+
+`file.writeText()` 使用系统默认文件权限，未显式设置 owner-only 权限。
+
+**建议**: 保存后调用 `file.setReadable(true, true)` / `file.setWritable(true, true)`。
+
+### C3. TextView 模拟按钮缺少无障碍角色
+
+**文件**: `PackageListAdapter.kt:61-69`  
+**类型**: 无障碍
+
+"数据"排除切换使用纯 `TextView` 实现点击交互，TalkBack 无法识别其可点击角色。
+
+**建议**: 改用 `MaterialButton` 或添加 `focusable=true`, `clickable=true`, `contentDescription`。
+
+---
+
+## HIGH 优先修复（29 项）
+
+### 安全（第一层汇总）
+
+| # | 文件 | 行号 | 问题 | 建议 |
+|---|------|------|------|------|
+| H1 | `ResticRestBridge.kt` | 27 | NanoHTTPD 绑定 0.0.0.0 无认证，局域网可访问 | 改为 `NanoHTTPD("127.0.0.1", 0)` |
+| H2 | `RestoreOperation.kt` | 137-149 | tar 解压使用 `-C /`，恶意存档可覆写系统文件 | 添加绝对路径检查，临时目录解压 |
+| H3 | `SmbTransport.kt` | 103-109 | SMB 上传大小不匹配仍返回 Success，数据可能静默损坏 | 不匹配时返回 `AppResult.Failure` |
+| H4 | `BackupOperation.kt` | 255-257 | `backupUserData` 全失败时返回 `true`，用户看到"成功" | 改为 `return false` |
+| H5 | `ResticBackup.kt` | 55-58, 73-77 | `CancellationException` 被空 `catch` 吞没，取消信号丢失 | 加 `catch (e: CancellationException) { throw e }` |
+| H6 | `WebdavTransport.kt` | 153-155 | `mkdirs` 完全失败仍返回 `Success(Unit)` | 异常时应返回 `AppResult.Failure` |
+| H7 | `RootShell.kt` | 84-87 | `CancellationException` 被 `catch (e: Exception)` 吞没，全局取消失效 | 加 `catch (e: CancellationException) { throw e }` |
+| H8 | `ResticRestore.kt` | 78, 107 | 同 H5，CancellationException 被空 catch 吞没 | 重新抛出 CancellationException |
+| H9 | `BackupConfig.kt` | 69, 73 | 所有密码未加密存储（OWASP 维度） | EncryptedSharedPreferences |
+| H10 | `ui/ConfigViewModel.kt` | 180-183 | 空密码检测仅 `initResticRepo` 中有，其他操作入口缺 | 在所有操作入口添加密码空值检查 |
+| H11 | `BackupConfig.kt` | 139-186 | `allowBackup=true` 使 ADB 备份可提取明文配置 | 设为 `false` 或加密 |
+
+### 架构与代码质量（第二层汇总）
+
+| # | 文件 | 行号 | 问题 | 建议 |
+|---|------|------|------|------|
+| H12 | `RestoreOperation.kt` | 85 | `coroutineScope` 非 `supervisorScope`，单应用失败取消全部 | 改用 `supervisorScope` |
+| H13 | `PackageName` 值类 | 全局 | 多处方法签名使用 `String` 而非 `PackageName` | 统一改为 `PackageName` |
+| H14 | `UserId` 值类 | 全局 | 业务层使用 `String`/`Int` 而非 `UserId` | 统一切换为 `UserId` |
+| H15 | `ResticRestBridge.kt` | 246-257 | `buildV2Json` 手动拼接 JSON，无转义 | 使用 `JSONObject`/`kotlinx.serialization` |
+| H16 | `BackupConfig.kt` | 77-137 | 领域模型混合文件 I/O 逻辑（`fromFile`/`toFile`） | 提取到 `BackupConfigSerializer` |
+| H17 | `BackupOperation.kt` + `RestoreOperation.kt` | 各 300-500 行 | object 承担过多职责，混合 Shell 命令 + 数据格式 + 文件操作 | 按关注点拆分 |
+| H18 | `package-list-adapter` | 33-90 | 程序化创建视图而非 XML，无法热重载 | 改用 XML 布局 |
+| H19 | 生产就绪 | 全局 | 大量硬编码中文字符串，strings.xml 完全过时 | 全部移入 strings.xml+国际化 |
+| H20 | `app/build.gradle` | 48-53 | Release 构建无混淆（R8/ProGuard） | 添加 `minifyEnabled true` |
+| H21 | `app/build.gradle` | 41,43 | 签名密码回退为弱密码 `"android"` | 环境变量未设置时强制构建失败 |
+| H22 | `.github/workflows/ci.yml` | - | CI 不运行 `test`，不验证回归 | 添加 `./gradlew test` |
+| H23 | `WebdavTransport.kt` | 22-28 | 无超时配置，请求可能永远挂起 | 设置 connect/read/write 超时 |
+| H24 | `SmbTransport.kt`, `WebdavTransport.kt` | 全局 | 远程操作无重试策略 | 实现指数退避重试 |
+
+### 可维护性与无障碍（第三层汇总）
+
+| # | 文件 | 行号 | 问题 | 建议 |
+|---|------|------|------|------|
+| H25 | `MD4Provider.kt` | 全文件 | 整文件死代码，被 `MissingAlgoProvider` 取代 | 删除 |
+| H26 | `BackupFragment.kt` | 440-546 | 3 个流式备份方法从未被调用 | 删除或接入 |
+| H27 | `RemoteTransport.kt` | 73-75 | `isFileNotFound` 扩展函数从未使用 | 删除 |
+| H28 | `AppScanner.kt` | 26-33 | `DataSizes` 数据类从未被填充或读取 | 删除 |
+| H29 | `PackageListAdapter.kt` | 76-88 | 卡片点击区域无障碍语义缺失 | 添加状态文字 contentDescription |
+
+---
+
+## 关键模式分析
+
+### 模式 1：CancellationException 被吞没（全局性）
+
+**影响面**: 项目几乎所有协程操作通过 `RootShell.exec`，其 `catch (e: Exception)` 吞没 `CancellationException`。用户取消操作时，正在运行的 shell 命令不会收到取消信号。
+
+**涉及文件**: `RootShell.kt:84-87`, `ResticBackup.kt:55-58,73-77,117-120,130-134`, `ResticRestore.kt:78,107`, `RootShell.kt:63-66`, `ResticWrapper.kt:315-317`
+
+**修复**: 所有空 `catch (_: Exception)` 前加 `catch (e: CancellationException) { throw e }`。
+
+### 模式 2：远程操作失败返回 Success（3 处）
+
+**涉及文件**: `SmbTransport.kt:103-109`, `WebdavTransport.kt:153-155`, `BackupOperation.kt:255-257`
+
+**影响**: 上层调用者无法区分"操作成功"和"操作失败但返回了 Success"。
+
+### 模式 3：PackageName/UserId 值类未被方法签名采用
+
+**涉及文件**: 全局，影响 `AppScanner`, `BackupOperation`, `RestoreOperation`, `StreamingBackup`, `PackageListAdapter`, `BackupProgress`, `RestoreProgress`
+
+**影响**: 值类的类型安全收益完全丧失，编译器无法区分 `PackageName` 和任意 `String`。
+
+### 模式 4：5 个子模块重复 local/remote 分支模式
+
+**涉及文件**: `ResticBackup.kt`, `ResticRestore.kt`, `ResticRepoInit.kt`, `ResticMaintenance.kt`, `ResticSnapshotOps.kt`
+
+**影响**: 每个方法都复制 `if (backend == "local")` 分支，增加维护成本和出错可能。
+
+### 模式 5：BackupFragment 和 RestoreFragment 缺少 onDestroyView
+
+**影响**: ViewPager 场景下，Fragment 视图销毁后协程完成时可能操作已分离的视图。
+
+---
+
+## 正向发现（设计良好的实践）
+
+| 实践 | 文件 | 说明 |
+|------|------|------|
+| ✅ 密码通过环境变量传递 | `ResticEnvResolver.kt` | 不在命令行中出现，防止 `ps` 窥探 |
+| ✅ `shellEscape()` 一致使用 | `RootShell.kt:15` | 所有 shell 拼接参数都经过转义 |
+| ✅ `execSafe()` 安全方法 | `RootShell.kt:95-101` | 提供自动参数转义的执行方法 |
+| ✅ SharedFlow 用于一次性事件 | `ConfigViewModel.kt:103` | 标准实践 |
+| ✅ StateFlow 用于 UI 状态 | `ConfigViewModel.kt:106` | 标准实践 |
+| ✅ `repeatOnLifecycle` | `ConfigFragment.kt:75-84` | 正确使用生命周期感知收集 |
+| ✅ ResticBinary 双重检查锁定 | `ResticBinary.kt:13-33` | 正确的 `@Volatile` + `synchronized` |
+
+---
+
+## 按文件发现密度
+
+| 文件 | 发现数 | 最严重 |
+|------|--------|--------|
+| `backup/ResticRestBridge.kt` | 10+ | HIGH |
+| `backup/BackupOperation.kt` | 10+ | HIGH |
+| `backup/BackupConfig.kt` | 8+ | CRITICAL |
+| `root/RootShell.kt` | 5+ | HIGH |
+| `backup/ResticBackup.kt` | 4+ | HIGH |
+| `backup/SmbTransport.kt` | 4+ | HIGH |
+| `backup/WebdavTransport.kt` | 4+ | HIGH |
+| `backup/RestoreOperation.kt` | 4+ | HIGH |
+| `ui/PackageListAdapter.kt` | 5+ | CRITICAL (a11y) |
+| `backup/ResticCommandRunner.kt` | 4+ | MEDIUM |
+| `ui/ConfigViewModel.kt` | 4+ | HIGH |
+| `backup/StreamingBackup.kt` | 3+ | MEDIUM |
+
+---
+
+## 修复路线图
+
+### 立即修复（CRITICAL）
+1. 密码加密存储（EncryptedSharedPreferences）
+2. 配置文件权限加固
+3. 无障碍：TextView 改为语义化按钮
+
+### 下一个版本（HIGH 优先级）
+4. `CancellationException` 全局修复（所有空 catch）
+5. ResticRestBridge 绑定 127.0.0.1 + 认证
+6. tar 解压路径检查
+7. SMB/WebDAV 失败时返回 Failure 而非 Success
+8. `supervisorScope` 替代 `coroutineScope`
+9. 死代码清理（MD4Provider.kt, 3 个死方法, DataSizes 等）
+10. 添加 release R8/ProGuard 混淆
+11. CI 添加 `./gradlew test`
+12. WebDAV 超时配置
+13. 远程操作重试策略
+14. 密码 UI 掩码输入
+15. 多目录恢复选择
+
+### 规划修复（MEDIUM）
+16. `PackageName`/`UserId` 值类全面采用
+17. BackupConfig 分离 I/O 逻辑
+18. BackupOperation/RestoreOperation 拆分
+19. PackageListAdapter 改用 XML 布局
+20. 国际化：硬编码字符串移入 strings.xml
+21. 释放签名密码加固
+22. 前台服务通知进度更新
+23. 恢复操作确认对话框
+24. API 超时配置
+25. `@Serializable` 死注解清理
+
+---
+
+## 统计概览
+
+| 指标 | 值 |
+|------|-----|
+| 审查技能数 | 11 |
+| 审查文件数 | 37 Kotlin + ~15 资源/配置 |
+| 总发现数 | 181 |
+| CRITICAL | 3 |
+| HIGH | 29 |
+| MEDIUM | 72 |
+| LOW/INFO | 77 |
+| 可删除代码 | ~150 行 + 1 个整文件 + ~20 行导入 |
+| 生产就绪评分 | 58/100 |
+| 测试覆盖率 | 53 测试（持续集成未运行） |

docs/reviews/refactor-cleaner-review.md

@@ -0,0 +1,266 @@
+# 第三阶段 — 死代码清理审查报告
+
+> 审查范围: android-backup-gui 项目 37 个 Kotlin 源文件
+> 审查技能: ecc-refactor-cleaner（死代码、未使用导入、重复逻辑、废弃代码）
+> 已知不重复: Phase 2 已报告的 @Serializable 死注解（TypeDesign F12）不在此重复
+> 已知不重复: memory 中 7 个待处理项不在此重复
+
+---
+
+## 严重程度分级
+
+| 等级 | 含义 |
+|------|------|
+| 🔴 **严重** | 功能层面死代码，占用维护成本，可能引发混淆 |
+| 🟠 **中** | 未使用导入/参数，可能清理但非功能阻塞 |
+| 🟡 **低** | 装饰性/可清理但不影响运行 |
+
+---
+
+## 🔴 严重发现
+
+### F1. `MD4Provider.kt` 整文件死代码
+
+**文件**: `app/src/main/java/com/example/androidbackupgui/backup/MD4Provider.kt`
+**行号**: 1-137（整文件）
+
+**问题**: `MD4Provider` 被 `MissingAlgoProvider` 完全取代。`MissingAlgoProvider` 提供了 `MD4` + `AESCMAC` 两种算法注入，且是 `SmbTransport` 实际调用的对象。`MD4Provider` 在任何地方都未被引用。
+
+**证据**:
+- `SmbTransport` 调用的是 `MissingAlgoProvider.register()`
+- 全局搜索 `MD4Provider` 仅命中自身文件
+
+**建议**: 删除整个 `MD4Provider.kt` 文件。
+
+---
+
+### F2. `BackupFragment.kt` 三个死方法（流式备份未接入）
+
+**文件**: `app/src/main/java/com/example/androidbackupgui/ui/BackupFragment.kt`
+**行号**: 440-546
+
+**问题**: 以下三个方法定义了流式备份逻辑但从未被调用：
+
+| 方法 | 行号 | 说明 |
+|------|------|------|
+| `estimateBackupSize()` | 440 | 估算备份数据大小 |
+| `hasEnoughSpace()` | 455 | 检查磁盘空间是否充足 |
+| `runStreamingResticBackup()` | 472 | 执行流式备份（FIFO 管道） |
+
+**证据**: 全局搜索三个方法名，除自身定义外无任何调用点。`startBackup()` 方法走的是常规 restic `backup` 路径，未调用流式路径。
+
+`runStreamingResticBackup` 上标注了 `@Suppress("UNUSED_PARAMETER")` 且参数 `outputDir: File` 从未使用，说明开发者已知此方法目前是死代码。
+
+**建议**: 删除三个方法及相关 `import android.os.StatFs`（如果没有其他用途）。或将流式备份接入到 `startBackup` 的条件分支中。
+
+---
+
+### F3. `RemoteTransport.isFileNotFound()` 未使用扩展函数
+
+**文件**: `app/src/main/java/com/example/androidbackupgui/backup/RemoteTransport.kt`
+**行号**: 73-75
+
+```kotlin
+internal fun AppError.isFileNotFound(): Boolean =
+    this is AppError.Remote && this.isNotFound
+```
+
+**问题**: 此扩展函数定义后从未在任何地方调用。`Remote` 错误中的 `isNotFound` 字段通过 `when (error) { is AppError.Remote -> ... }` 模式匹配访问，不需要扩展函数。
+
+**证据**: 全局搜索 `isFileNotFound` 仅命中此定义。
+
+**建议**: 删除此扩展函数。
+
+---
+
+### F4. `DataSizes` 数据类及其字段从未使用
+
+**文件**: `app/src/main/java/com/example/androidbackupgui/backup/AppScanner.kt`
+**行号**: 26-33
+
+```kotlin
+@Serializable
+data class DataSizes(
+    val apkBytes: Long = 0,
+    val userBytes: Long = 0,
+    // ...
+)
+```
+
+```kotlin
+data class AppInfo(
+    // ...
+    val dataSizes: DataSizes = DataSizes(),  // 33 行
+)
+```
+
+**问题**: `DataSizes` 类型仅用于 `AppInfo.dataSizes` 字段的默认值，没有任何代码对此字段写入非默认值或读取。这是残留的"预留"字段。
+
+**证据**: 全局搜索 `dataSizes` 仅命中定义行（33）和 `DataSizes` 类型本身（26）。`@Serializable` 注解也是死注解（`AppInfo` 从未被 kotlinx-serialization 序列化）。
+
+**建议**: 删除 `DataSizes` 数据类和 `AppInfo.dataSizes` 字段。保留 `@Serializable` 的清理评估留给 Phase 2 已知报告。
+
+---
+
+## 🟠 中等发现
+
+### F5. 子模块中 TAG 常量复制粘贴错误
+
+**文件**: 
+- `app/src/main/java/com/example/androidbackupgui/backup/ResticRepoInit.kt` 第 7 行: `private val TAG = "ResticWrapper"`
+- `app/src/main/java/com/example/androidbackupgui/backup/ResticCommandRunner.kt` 第 8 行: `private val TAG = "ResticWrapper"`
+
+**问题**: 两个子模块使用的 TAG 为 `"ResticWrapper"`，而非自己的类名。导致 logcat 中无法区分日志来源。
+
+**建议**: 改为 `"ResticRepoInit"` 和 `"ResticCommandRunner"`。
+
+---
+
+### F6. 同包冗余导入（跨 7 个文件）
+
+以下文件在 `package com.example.androidbackupgui.backup` 中，却显式 import 了同包的 `AppError`、`AppResult`、`err`：
+
+| 文件 | 冗余导入行 |
+|------|-----------|
+| `ResticRepoInit.kt` | `import com.example.androidbackupgui.backup.AppError/AppResult/err` |
+| `ResticBackup.kt` | `import com.example.androidbackupgui.backup.AppError/AppResult/err` |
+| `ResticRestore.kt` | `import com.example.androidbackupgui.backup.AppError/AppResult/err` |
+| `ResticSnapshotOps.kt` | `import com.example.androidbackupgui.backup.AppError/AppResult/err` |
+| `ResticMaintenance.kt` | `import com.example.androidbackupgui.backup.AppError/AppResult/err` |
+| `ResticWrapper.kt` | `import com.example.androidbackupgui.backup.AppError/AppResult/err` |
+| `ResticCommandRunner.kt` | `import com.example.androidbackupgui.backup.AppError`（且此导入实际未使用——该文件不引用 `AppError`）|
+
+**建议**: 清理全部冗余 import。`ResticCommandRunner.kt` 中的 `AppError` 为真正未使用导入，应删除。
+
+---
+
+### F7. 真正未使用的导入
+
+| 文件 | 行号 | 导入 | 原因 |
+|------|------|------|------|
+| `ResticWrapper.kt` | 5 | `import kotlinx.coroutines.isActive` | 文件内无使用 |
+| `ResticWrapper.kt` | 9 | `import kotlin.coroutines.coroutineContext` | 文件内无使用 |
+| `BackupFragment.kt` | 34 | `import com.example.androidbackupgui.backup.formatSize` | 文件内无使用 |
+| `ConfigFragment.kt` | 19-20 | `import kotlinx.coroutines.Dispatchers` / `import kotlinx.coroutines.withContext` | Fragment 类中从未使用（全部委托给 ViewModel）|
+| `ConfigViewModel.kt` | 8 | `import com.example.androidbackupgui.backup.formatSize` | 文件内无使用 |
+
+**建议**: 删除上述导入。
+
+---
+
+### F8. 未使用参数（已标注 `@Suppress`）
+
+| 文件 | 函数 | 未使用参数 | 行号 |
+|------|------|-----------|------|
+| `ResticRestBridge.kt` | `handleConfig()` | `headers: Map<String, String>` | 166 |
+| `StreamingBackup.kt` | `launchDataProducer()` | `userId: String` | 90 |
+| `BackupFragment.kt` | `runStreamingResticBackup()` | `outputDir: File` | 475 |
+
+**问题**: 参数被显式标记为未使用。如果近期无实现计划，应直接删除参数。
+
+**建议**:
+- `handleConfig`: `headers` 可以移除（HEAD/GET/POST 都不需要它）
+- `launchDataProducer`: `userId` 若留作后续多用户支持，保留但记录 TODO
+- `runStreamingResticBackup`: 整个方法为死代码（见 F2），删除即可
+
+---
+
+## 🟡 低严重度发现
+
+### F9. `AppScanner.getAppLabel()` 方法
+
+**文件**: `app/src/main/java/com/example/androidbackupgui/backup/AppScanner.kt`
+**行号**: 87-92
+
+```kotlin
+suspend fun getAppLabel(packageName: String): String = withContext(Dispatchers.IO) {
+    val result = RootShell.exec("dumpsys package ...")
+    // ...
+}
+```
+
+**问题**: 此 public 方法通过 `dumpsys package` 解析应用标签。但它返回的是包名（fallback），且项目中实际使用 `resolveLabels()`（通过 `PackageManager` API）来获取标签。此方法未被任何代码调用。
+
+**证据**: 项目中使用 `resolveLabels()` 获取标签，`getAppLabel()` 无调用者。
+
+**建议**: 确认无用后删除。
+
+---
+
+### F10. 重复的 if-else bridge 模式（架构级别）
+
+在 5 个子模块中（`ResticRepoInit`, `ResticBackup`, `ResticRestore`, `ResticSnapshotOps`, `ResticMaintenance`），每个方法都重复以下模式：
+
+```kotlin
+if (backend == "local") {
+    val env = envResolver.buildLocalEnv(...)
+    // run restic command
+} else {
+    bridgeRunner.withBridge(...) { bridgeUrl ->
+        val env = envResolver.buildBridgeEnv(...)
+        // run restic command
+    }
+}
+```
+
+**影响**: `ResticMaintenance` 中 3 个方法（prune/check/stats）结构完全一致，仅有命令参数不同。跨模块总共 ~8 次重复。
+
+**建议**: 可提取为公共执行函数，如 `withResticEnv(backend, ...) { env -> runner.runRestic(env, ...) }`。此为架构改进建议，非阻塞。
+
+---
+
+### F11. `BackupFragment.estimateBackupSize` 缩进错误
+
+**文件**: `app/src/main/java/com/example/androidbackupgui/ui/BackupFragment.kt`
+**行号**: 440-449
+
+缩进层次错误：`val pkgEsc = ...` 等行应在 `for` 循环体内但缩进级别与函数体相同：
+
+```kotlin
+for (app in apps) {
+val pkgEsc = app.packageName.value.shellEscape()  // ← 缩进错误
+val result = RootShell.exec(...)
+```
+
+**建议**: 修复缩进（但该函数本身是死代码 F2，删除后自然解决）。
+
+---
+
+### F12. 重复的 UID 解析逻辑
+
+**文件**: 
+- `AppScanner.kt` — `hasKeystore()`（行 111-117）中解析 UID 的逻辑
+- `RestoreOperation.kt` — `resolveAppUid()`（行 462-490）中解析 UID 的逻辑
+
+**问题**: 两处通过 `dumpsys package ... | grep 'userId='` 解析 UID 的代码逻辑高度相似。`RestoreOperation.resolveAppUid()` 更完整（支持 3 种 fallback），但 `AppScanner.hasKeystore()` 有独立的实现。
+
+**建议**: 可将 UID 解析提取为公共工具函数，避免两处维护。
+
+---
+
+## 汇总
+
+| 编号 | 严重度 | 类别 | 位置 | 建议 |
+|------|--------|------|------|------|
+| F1 | 🔴 | 死代码 | `MD4Provider.kt` 整文件 | 删除 |
+| F2 | 🔴 | 死代码 | `BackupFragment.kt` 440-546（3 个方法）| 删除或接入 |
+| F3 | 🔴 | 死代码 | `RemoteTransport.kt:73-75` | 删除扩展函数 |
+| F4 | 🔴 | 死代码 | `AppScanner.kt:26-33` DataSizes | 删除 |
+| F5 | 🟠 | 错误TAG | `ResticRepoInit.kt:7`, `ResticCommandRunner.kt:8` | 改为类名 |
+| F6 | 🟠 | 冗余导入 | 7 个文件中的同包 import | 清理 |
+| F7 | 🟠 | 未使用导入 | 5 个文件 | 删除 |
+| F8 | 🟠 | 未使用参数 | 3 个函数（已 @Suppress）| 删除参数或加 TODO |
+| F9 | 🟡 | 死代码 | `AppScanner.kt:87-92` getAppLabel | 确认后删除 |
+| F10 | 🟡 | 重复模式 | 5 个子模块中的 if-else bridge | 提取公共执行函数 |
+| F11 | 🟡 | 格式问题 | `BackupFragment.kt:440-449` 缩进 | 修复（随 F2 解决）|
+| F12 | 🟡 | 重复逻辑 | UID 解析在两处重复 | 提取工具函数 |
+
+---
+
+## 清理收益估算
+
+- 可删除文件: 1 个（`MD4Provider.kt`, ~5.1KB）
+- 可删除代码行: ~150 行（死方法 + DataSizes + 扩展函数）
+- 可清理导入: ~20 行（冗余 + 未使用导入）
+- 可清理参数: 3 个
+- 代码库缩减: ~6-8% 的源代码量