release: v1.15

修复: 备份异常 EPERM (Operation not permitted) 导致整个备份中断
- BackupOperation: 检查 mkdirs 返回值，writeText 异常时优雅降级而非抛出
- BackupScreen: 增加异常完整堆栈记录和智能提示（EPERM/EACCES）

.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
+}

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** (1684 symbols, 4068 relationships, 146 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** (1684 symbols, 4068 relationships, 146 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
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
+

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 15
+        versionName "1.15"
     }
     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 +74,55 @@ 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.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 +1,46 @@
 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.Surface
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.ui.Modifier
+import com.example.androidbackupgui.backup.LogUtil
+import com.example.androidbackupgui.backup.ResticBinary
+import com.example.androidbackupgui.backup.ResticWrapper
 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 { ResticWrapper.binaryPath = it }
 
-        // Request root access on startup
-        lifecycleScope.launch(Dispatchers.IO) {
-            RootShell.ensureSession()
-        }
+        // Initialize file-based logging
+        LogUtil.init(filesDir)
 
-        // 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/BackupConfig.kt

@@ -6,36 +6,39 @@ import kotlinx.serialization.Serializable
 /**
  * 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(
+    val customPath: List<String> = listOf(
         "/storage/emulated/0/Pictures/",
         "/storage/emulated/0/Download/",
         "/storage/emulated/0/Music",
@@ -44,38 +47,69 @@ data class BackupConfig(
     ),
 
     // 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,
+    val rgbA: Int = 226,
+    val rgbB: Int = 123,
+    val rgbC: Int = 177,
 
-    var backupWifi: Int = 1,
+    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 = "",
+    val resticPassword: String = "",
+    val resticBackend: String = "local",    // local / webdav / smb
+    val resticBackendUrl: String = "",
+    val resticBackendUser: String = "",
+    val resticBackendPass: String = "",
+    val resticBackendShare: String = "",      // SMB share name
+    val resticBackendDomain: String = ""      // SMB domain (optional, for NTLM)
 ) {
     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 ->
@@ -84,8 +118,21 @@ 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
@@ -97,41 +144,43 @@ data class BackupConfig(
                     .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 = str("restic_password"),
+                resticBackend = str("restic_backend").ifEmpty { "local" },
+                resticBackendUrl = str("restic_backend_url"),
+                resticBackendUser = str("restic_backend_user"),
+                resticBackendPass = str("restic_backend_pass"),
+                resticBackendShare = str("restic_backend_share"),
+                resticBackendDomain = str("restic_backend_domain"),
+            )
         }
 
         fun toFile(config: BackupConfig, file: File) {
@@ -142,16 +191,17 @@ data class BackupConfig(
                 appendLine("background_execution=${config.backgroundExecution}")
                 appendLine("setDisplayPowerMode=${config.setDisplayPowerMode}")
                 appendLine("Shell_LANG=${config.shellLang}")
-                appendLine("Output_path=\"${config.outputPath}\"")
-                appendLine("list_location=\"${config.listLocation}\"")
+                appendLine("Output_path=\"${escapeValue(config.outputPath)}\"")
+                appendLine("list_location=\"${escapeValue(config.listLocation)}\"")
                 appendLine("update=${config.update}")
                 appendLine("cdn=${config.cdn}")
-                appendLine("mount_point=\"${config.mountPoint}\"")
+                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(" ${it.replace(" ", "%20")}") }
@@ -172,15 +222,17 @@ data class BackupConfig(
                 appendLine("rgb_c=${config.rgbC}")
                 appendLine("backup_wifi=${config.backupWifi}")
                 appendLine("restic_enabled=${config.resticEnabled}")
-                appendLine("restic_repo=\"${config.resticRepo}\"")
-                appendLine("restic_password=\"${config.resticPassword}\"")
+                appendLine("restic_repo=\"${escapeValue(config.resticRepo)}\"")
+                appendLine("restic_password=\"${escapeValue(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}\"")
+                appendLine("restic_backend_url=\"${escapeValue(config.resticBackendUrl)}\"")
+                appendLine("restic_backend_user=\"${escapeValue(config.resticBackendUser)}\"")
+                appendLine("restic_backend_pass=\"${escapeValue(config.resticBackendPass)}\"")
+                appendLine("restic_backend_share=\"${escapeValue(config.resticBackendShare)}\"")
+                appendLine("restic_backend_domain=\"${escapeValue(config.resticBackendDomain)}\"")
             })
+            file.setReadable(true, true)   // owner only
+            file.setWritable(true, true)   // owner only
         }
     }
 }

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

@@ -1,17 +1,19 @@
 package com.example.androidbackupgui.backup
 
+import com.example.androidbackupgui.backup.ResticWrapper.SnapshotAppInfo
 import com.example.androidbackupgui.root.RootShell
 import android.util.Log
 import com.example.androidbackupgui.root.shellEscape
+import kotlinx.coroutines.ensureActive
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.isActive
 import kotlinx.coroutines.withContext
 import java.io.File
+import org.json.JSONArray
 import org.json.JSONObject
-import kotlin.coroutines.coroutineContext
 import kotlinx.serialization.Serializable
 import kotlinx.coroutines.coroutineScope
-import kotlinx.coroutines.launch
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.sync.Semaphore
 import kotlinx.coroutines.sync.withPermit
 import java.util.concurrent.atomic.AtomicInteger
@@ -48,13 +50,21 @@ 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",
+        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) } }
@@ -62,33 +72,50 @@ object BackupOperation {
 
         // Create backup structure
         val backupRoot = File(outputDir, "Backup_${config.compressionMethod}_$userId")
-        backupRoot.mkdirs()
+        if (!backupRoot.mkdirs() && !backupRoot.isDirectory) {
+            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}")
 
-        // Write app list
+        // Write app list — includes ALL packages in [apps] (selected + legacy from snapshot)
         val appListFile = File(backupRoot, "appList.txt")
-        appListFile.writeText(apps.joinToString("\n") { it.packageName })
+        try {
+            appListFile.writeText(apps.joinToString("\n") { it.packageName.value })
+        } catch (e: Exception) {
+            LogUtil.e(TAG, "backupApps: failed to write appList.txt — ${e.message}")
+            return@withContext BackupResult(0, 0, 0, outputDir.absolutePath, 0)
+        }
 
-        // Write metadata JSON
+        // Write metadata JSON — fresh metadata for selected apps, legacy for historical apps
         val metaFile = File(backupRoot, "app_details.json")
-        metaFile.writeText(buildAppDetailsJson(apps))
+        try {
+            metaFile.writeText(buildAppDetailsJson(apps, legacyApps))
+        } catch (e: Exception) {
+            LogUtil.e(TAG, "backupApps: failed to write app_details.json — ${e.message}")
+            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)
 
         coroutineScope {
-            apps.forEachIndexed { index, app ->
-                launch {
-                    if (!coroutineContext.isActive) return@launch
+            backupTargets.mapIndexed { index, app ->
+                async {
                     semaphore.withPermit {
-                        val appDir = File(backupRoot, app.packageName)
+                        ensureActive()
+                        val appDir = File(backupRoot, app.packageName.value)
                         appDir.mkdirs()
 
-                        emit(BackupProgress(index + 1, apps.size, app.packageName, "apk", "正在备份 APK…"))
+                        emit(BackupProgress(index + 1, totalCount, app.packageName.value, "apk", "正在备份 APK…"))
 
                         // 1. Backup APK
-                        val paths = AppScanner.getApkPaths(app.packageName)
+                        val paths = AppScanner.getApkPaths(app.packageName.value)
                         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"
@@ -98,54 +125,76 @@ object BackupOperation {
 
                         if (!apkOk) {
                             failAtomic.incrementAndGet()
-                            emit(BackupProgress(index + 1, apps.size, app.packageName, "done", "APK 备份失败"))
+                            emit(BackupProgress(index + 1, totalCount, app.packageName.value, "done", "APK 备份失败"))
                             return@withPermit
                         }
 
+                        // 1.5 Keystore check — warn if app has keystore entries (keys can be lost)
+                        val hasKeystore = AppScanner.hasKeystore(app.packageName.value)
+                        if (hasKeystore) {
+                            emit(BackupProgress(index + 1, totalCount, app.packageName.value, "data", "⚠ 此应用包含密钥库条目，备份后密钥可能会丢失"))
+                        }
+
                         // 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
+                            if (app.packageName.value in noDataBackup) {
+                                emit(BackupProgress(index + 1, totalCount, app.packageName.value, "data", "跳过数据备份（已排除）"))
+                            } else {
+                                emit(BackupProgress(index + 1, totalCount, app.packageName.value, "data", "正在备份数据…"))
+                                if (!backupUserData(context, app.packageName.value, appDir, userId, config.compressionMethod)) {
+                                    failAtomic.incrementAndGet()
+                                    emit(BackupProgress(index + 1, totalCount, app.packageName.value, "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)
+                            val hasObb = AppScanner.hasObbData(app.packageName.value)
                             if (hasObb) {
-                                emit(BackupProgress(index + 1, apps.size, app.packageName, "obb", "正在备份 OBB…"))
-                                if (!backupObb(app.packageName, appDir, config.compressionMethod)) {
+                                emit(BackupProgress(index + 1, totalCount, app.packageName.value, "obb", "正在备份 OBB…"))
+                                if (!backupObb(app.packageName.value, appDir, config.compressionMethod)) {
                                     failAtomic.incrementAndGet()
-                                    emit(BackupProgress(index + 1, apps.size, app.packageName, "done", "OBB 备份失败"))
+                                    emit(BackupProgress(index + 1, totalCount, app.packageName.value, "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)
+                        emit(BackupProgress(index + 1, totalCount, app.packageName.value, "ssaid", "正在备份 SSAID…"))
+                        backupSsaid(app.packageName.value, appDir, userId)
+
+                        // 4.5 Backup app icon
+                        val iconPath = AppScanner.extractIcon(app.packageName.value, appDir, app.userId.value)
+                        if (iconPath != null) {
+                            Log.d(TAG, "backupApps: saved icon for ${app.packageName} -> $iconPath")
+                        }
 
                         // 5. Backup runtime permissions
-                        backupPermissions(app.packageName, appDir)
+                        backupPermissions(app.packageName.value, appDir)
 
                         successAtomic.incrementAndGet()
-                        emit(BackupProgress(index + 1, apps.size, app.packageName, "done", "完成"))
+                        emit(BackupProgress(index + 1, totalCount, app.packageName.value, "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")
+
         BackupResult(
-            successCount = successAtomic.get(),
-            failCount = failAtomic.get(),
-            skippedCount = skippedAtomic.get(),
+            successCount = successCount,
+            failCount = failCount,
+            skippedCount = skippedCount,
             outputDir = backupRoot.absolutePath,
             elapsedMs = elapsed
         )
@@ -153,6 +202,7 @@ object BackupOperation {
 
 
     private suspend fun backupUserData(
+        context: android.content.Context,
         packageName: String,
         appDir: File,
         userId: String,
@@ -160,101 +210,117 @@ object BackupOperation {
     ): Boolean {
         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")
+        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 = archiveCreated || (archiveRaw.exists() && archiveRaw.length() > 0)
+            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 = archiveCreated || (archiveRaw.exists() && archiveRaw.length() > 0)
+            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'"
+            Log.w(TAG, "backupUserData: $packageName step3 trying /proc/1/root")
+            val globalRelPaths = dataPaths.map { it.removePrefix("/") }
             val globalCmd = if (isZstd) {
-                "cd /proc/1/root && tar $excludeArgs -cf - ${globalRelPaths.joinToString(" ")} 2>/dev/null | zstd -T0 -o '$outputFile.zst'"
+                "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 && tar $excludeArgs -czf '$outputFile.gz' ${globalRelPaths.joinToString(" ")} 2>/dev/null"
+                "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)
-        }
-
-        // 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'"
-            } else {
-                "tar $excludeArgs -czf '${rawOut}.gz' $dirList 2>/dev/null"
-            }
-            result = RootShell.exec("su -Z u:r:magisk:s0 -c \"$innerCmd\" 2>/dev/null")
-            archiveCreated = result?.isSuccess == true || (archiveRaw.exists() && archiveRaw.length() > 0)
+            archiveCreated = archiveCreated || (archiveRaw.exists() && archiveRaw.length() > 0)
+            Log.d(TAG, "backupUserData: $packageName step3 exit=${result?.exitCode} err='${result?.error?.take(100)}'")
         }
 
         if (!archiveCreated) {
-            Log.w(TAG, "backupUserData: $packageName all methods failed — no data dirs to backup (or inaccessible)")
-            return true
+            Log.w(TAG, "backupUserData: $packageName all methods failed — no data dirs (or inaccessible)")
+            return false
         }
-        // Verify integrity
+
+        // Verify compression integrity
         val verifyOk = if (isZstd) {
-            RootShell.exec("zstd -t '$outputFile.zst' 2>/dev/null").isSuccess
+            RootShell.exec("$zstdCmd -t '$outputFile.zst' 2>/dev/null").isSuccess
         } else {
             RootShell.exec("gzip -t '$outputFile.gz' 2>/dev/null").isSuccess
         }
         if (!verifyOk) {
             Log.e(TAG, "backupUserData: $packageName integrity check FAILED")
+            return false
         }
-        return verifyOk
+
+        // Validate tar archive structure (Android-DataBackup Tar.test() pattern)
+        val tarValidateOk = if (isZstd) {
+            RootShell.exec("$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 false
+        }
+        return true
     }
 
     /** Run tar for given paths, building the appropriate zstd/gzip command. */
     private 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 {
         val obbDir = "/storage/emulated/0/Android/obb/${packageName.shellEscape()}"
         val escapedAppDir = appDir.absolutePath.shellEscape()
         val escapedPkg = packageName.shellEscape()
+        // Exclude cache and backup temp files from OBB archive
+        val obbExcludes = "--exclude='cache' --exclude='Backup_*'"
         val result = when (compression) {
-            "zstd" -> RootShell.exec("tar -cf - '$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")
+            "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}")
@@ -266,31 +332,77 @@ object BackupOperation {
         if (!verificationOk) {
             Log.e(TAG, "OBB archive integrity check FAILED for $packageName")
         }
-        return verificationOk
+        // Validate OBB tar structure
+        val tarListCmd = if (compression == "zstd") "zstd -d -c '$archive' 2>/dev/null | tar -tf - > /dev/null 2>&1" else "tar -tf '$archive' > /dev/null 2>&1"
+        val tarOk = RootShell.exec(tarListCmd).isSuccess
+        if (!tarOk) {
+            Log.e(TAG, "OBB tar structure validation FAILED for $packageName")
+        }
+        return verificationOk && tarOk
     }
 
     private 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) {
+            try {
+                File(appDir, "ssaid.txt").writeText(value)
+                Log.d(TAG, "backupSsaid: backed up SSAID for $packageName = $value")
+            } catch (e: Exception) {
+                Log.w(TAG, "backupSsaid: failed to write ssaid.txt for $packageName", e)
+            }
         }
     }
 
     private 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)
+            try {
+                File(appDir, "permissions.txt").writeText(result.output)
+            } catch (e: Exception) {
+                Log.w(TAG, "backupPermissions: failed to write permissions.txt for $packageName", e)
+            }
         }
     }
 
-    private fun buildAppDetailsJson(apps: List<AppInfo>): String {
+    internal suspend fun buildAppDetailsJson(
+        apps: List<AppInfo>,
+        legacyApps: Map<String, SnapshotAppInfo>? = null
+    ): String {
         val root = JSONObject()
+        // Generate fresh metadata for apps in the current app list
         for (app in apps) {
             val entry = JSONObject()
             entry.put("label", app.label)
             entry.put("isSystem", app.isSystem)
-            root.put(app.packageName, entry)
+            // Record APK file sizes for change detection in incremental backup
+            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))
+            root.put(app.packageName.value, entry)
+        }
+        // Include legacy apps not in current app list with preserved metadata
+        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)
     }

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 +1,35 @@
+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。
+ */
+@JvmInline
+@Serializable
+value class PackageName(val value: String) {
+    init {
+        require(value.isNotBlank()) { "PackageName must not be blank" }
+    }
+    override fun toString(): String = value
+}
+
+/**
+ * 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/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

@@ -4,24 +4,28 @@ import android.util.Log
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.withContext
-import kotlinx.serialization.json.Json
+import kotlinx.coroutines.CancellationException
 import kotlin.coroutines.coroutineContext
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
+import java.io.File
 
-/** 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.
+ * [RestBridgeRunner] which are shared across sub-modules.
  */
 class ResticBackup(
     private val runner: ResticCommandRunner,
     private val envResolver: ResticEnvResolver,
-    private val syncManager: RemoteSyncManager
+    private val bridgeRunner: RestBridgeRunner
 ) {
-    private val TAG = "ResticWrapper"
+    private val TAG = "ResticBackup"
+    var cacheDir: String = ""
+    var backendDomain: String = ""
 
     // ── Backup ─────────────────────────────────────────
 
@@ -36,51 +40,119 @@ 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) {
+    ): AppResult<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,
-        ) {
+
+        if (backend == "local") {
             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 env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
             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 */ }
-            }
-
-            if (result.exitCode != 0) {
-                return@withRemoteSync Result.failure(Exception("restic backup failed: ${result.stderr}"))
+                } catch (e: Exception) { if (e is CancellationException) throw e }
             }
 
+            if (result.exitCode != 0) return@withContext err(AppError.Restic("restic backup 失败", result.exitCode, result.stderr))
             parseBackupSummary(result.stdout)
+        } else {
+            bridgeRunner.withBridge(backend, backendUrl, backendUser, backendPass, backendShare, backendDomain, repoPath, File(cacheDir)) { bridgeUrl, authToken ->
+                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.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                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 (e: Exception) { if (e is CancellationException) throw e }
+                }
+
+                if (result.exitCode != 0) return@withBridge err(AppError.Restic("restic backup 失败", result.exitCode, result.stderr))
+                parseBackupSummary(result.stdout)
+            }
+        }
+    }
+
+    // ── Streaming backup (stdin) ──────────────────────
+
+    /**
+     * Run restic backup in --stdin mode, reading tar data from [stdinFile] (FIFO).
+     * [extraPaths] are files/directories backed up alongside the streaming data
+     * (e.g. APK paths, metadata directory).
+     */
+    suspend fun backupStdin(
+        repoPath: String,
+        password: String,
+        stdinFile: File,
+        extraPaths: List<String>,
+        tags: List<String> = emptyList(),
+        hostname: String? = null,
+        backend: String = "local",
+        backendUrl: String = "",
+        backendUser: String = "",
+        backendPass: String = "",
+        backendShare: String = "",
+        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", "--stdin", "--stdin-filename", "app_data.tar")
+        for (path in extraPaths) args.add(path)
+        for (tag in tags) { args.add("--tag"); args.add(tag) }
+        if (hostname != null) { args.add("--host"); args.add(hostname) }
+
+        if (backend == "local") {
+            val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
+            val result = runner.runResticWithStdin(env, args, stdinFile) { line ->
+                if (!coroutineContext.isActive) return@runResticWithStdin
+                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@withContext err(AppError.Restic("restic stream backup 失败", result.exitCode, result.stderr))
+            parseBackupSummary(result.stdout)
+        } else {
+            bridgeRunner.withBridge(backend, backendUrl, backendUser, backendPass, backendShare, backendDomain, repoPath, File(cacheDir)) { bridgeUrl, authToken ->
+                val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                val result = runner.runResticWithStdin(env, args, stdinFile) { line ->
+                    if (!coroutineContext.isActive) return@runResticWithStdin
+                    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@withBridge err(AppError.Restic("restic stream 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)
+                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)
@@ -96,57 +120,119 @@ class ResticCommandRunner {
 
             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)
+            val stderrBytes = try { process.errorStream.use { it.readAllBytesCompat() } } catch (_: Exception) { byteArrayOf() }
+            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: ${stderrText}")
-            CommandResult(stdoutText.toString().trim(), stderrText.toString().trim(), exitCode)
+            CommandResult(stdoutText.toString().trim(), stderrText.trim(), exitCode)
+        } catch (e: kotlinx.coroutines.CancellationException) {
+            throw e
         } catch (e: Exception) {
             Log.e(TAG, "runResticStreaming exception", e)
             try { process?.destroy() } catch (_: Exception) {}
             CommandResult("", e.message ?: "Unknown error", -1)
         }
     }
+
+    /**
+     * Run restic with stdin redirected from [stdinFile] (FIFO or regular file).
+     * Calls [onLine] for each stdout line (for streaming progress).
+     */
+    suspend fun runResticWithStdin(
+        env: Map<String, String>,
+        args: List<String>,
+        stdinFile: File,
+        onLine: suspend (String) -> Unit
+    ): CommandResult = withContext(Dispatchers.IO) {
+        val cmdArgs = buildCommandArgs(args)
+        Log.i(TAG, "runResticWithStdin cmd=${cmdArgs.joinToString(" ")} stdin=${stdinFile.absolutePath}")
+        Log.d(TAG, "runResticWithStdin REPOSITORY=${env["RESTIC_REPOSITORY"]}")
+        env["TMPDIR"]?.let { File(it).mkdirs() }
+
+        var process: Process? = null
+        try {
+
+            val pb = ProcessBuilder(cmdArgs)
+            pb.environment().putAll(env)
+            pb.redirectErrorStream(false)
+            process = pb.start()
+
+            // Pipe stdin from file to process on a daemon thread (API 24 compat)
+            Thread {
+                try {
+                    val fis = java.io.FileInputStream(stdinFile)
+                    val pos = process!!.outputStream
+                    fis.use { input -> pos.use { output -> input.copyTo(output) } }
+                } catch (_: Exception) {
+                    // FIFO writer closed; stdin pipe ends naturally
+                }
+            }.apply { isDaemon = true; start() }
+            val stdoutText = StringBuilder()
+            val reader = process.inputStream.bufferedReader()
+
+            try {
+                var line = reader.readLine()
+                while (line != null) {
+                    if (!coroutineContext.isActive) {
+                        process.destroy()
+                        break
+                    }
+                    stdoutText.appendLine(line)
+                    onLine(line)
+                    line = reader.readLine()
+                }
+            } finally {
+                try { reader.close() } catch (_: Exception) {}
+            }
+            val stderrBytes = try { process.errorStream.use { it.readAllBytesCompat() } } catch (_: Exception) { byteArrayOf() }
+            val stderrText = stderrBytes.decodeToString().trim()
+            val exitCode = try {
+                process.waitForCompat()
+            } catch (_: Exception) { -1 }
+
+            Log.i(TAG, "runResticWithStdin exitCode=$exitCode stdout_len=${stdoutText.length}")
+            if (stderrText.isNotEmpty()) Log.w(TAG, "runResticWithStdin stderr: ${stderrText}")
+            CommandResult(stdoutText.toString().trim(), stderrText.trim(), exitCode)
+        } catch (e: kotlinx.coroutines.CancellationException) {
+            throw e
+        } catch (e: Exception) {
+            Log.e(TAG, "runResticWithStdin 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.
+ */
+private 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

@@ -5,32 +5,43 @@ package com.example.androidbackupgui.backup
  */
 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)
-        }
+        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> {
+        val env = HashMap(System.getenv() ?: emptyMap())
+        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

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

@@ -2,20 +2,35 @@ package com.example.androidbackupgui.backup
 
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
+import java.io.File
 
 /**
  * Repository maintenance operations: prune, check, stats.
  *
  * [prune] requires both download and upload (it removes pack files from the remote).
  * [check] and [stats] are download-only read operations.
+ *
+ * For remote backends, uses [RestBridgeRunner] to serve the backend via REST,
+ * so restic always sees a local rest-server repository. For local backends,
+ * operates directly on the repo path.
+ *
  * 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
 ) {
+    /** 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 = ""
+
     // ── Prune ──────────────────────────────────────────
 
     suspend fun prune(
@@ -26,19 +41,53 @@ class ResticMaintenance(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> =
+    ): AppResult<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)
+            if (backend == "local") {
+                val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
                 val result = runner.runRestic(env, "prune")
-                if (result.exitCode == 0) Result.success(result.stdout)
-                else Result.failure(Exception("restic prune failed: ${result.stderr}"))
+                if (result.exitCode == 0) AppResult.Success(result.stdout)
+                else err(AppError.Restic("restic prune 失败", result.exitCode, result.stderr))
+            } else {
+                bridgeRunner.withBridge(
+                    backend, backendUrl, backendUser, backendPass, backendShare,
+                    backendDomain, repoPath, File(cacheDir)
+                ) { bridgeUrl, authToken ->
+                    val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                    val result = runner.runRestic(env, "prune")
+                    if (result.exitCode == 0) AppResult.Success(result.stdout)
+                    else err(AppError.Restic("restic prune 失败", result.exitCode, result.stderr))
+                }
+            }
+        }
+
+    // ── Unlock ──────────────────────────────────────────
+
+    suspend fun unlock(
+        repoPath: String,
+        password: String,
+        backend: String = "local",
+        backendUrl: String = "",
+        backendUser: String = "",
+        backendPass: String = "",
+        backendShare: String = "",
+    ): AppResult<String> =
+        withContext(Dispatchers.IO) {
+            if (backend == "local") {
+                val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
+                val result = runner.runRestic(env, "unlock")
+                if (result.exitCode == 0) AppResult.Success(result.stdout)
+                else err(AppError.Restic("restic unlock 失败", result.exitCode, result.stderr))
+            } else {
+                bridgeRunner.withBridge(
+                    backend, backendUrl, backendUser, backendPass, backendShare,
+                    backendDomain, repoPath, File(cacheDir)
+                ) { bridgeUrl, authToken ->
+                    val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                    val result = runner.runRestic(env, "unlock")
+                    if (result.exitCode == 0) AppResult.Success(result.stdout)
+                    else err(AppError.Restic("restic unlock 失败", result.exitCode, result.stderr))
+                }
             }
         }
 
@@ -52,19 +101,23 @@ class ResticMaintenance(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> =
+    ): AppResult<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)
+            if (backend == "local") {
+                val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
                 val result = runner.runRestic(env, "check")
-                if (result.exitCode == 0) Result.success(result.stdout)
-                else Result.failure(Exception("restic check failed: ${result.stderr}"))
+                if (result.exitCode == 0) AppResult.Success(result.stdout)
+                else err(AppError.Restic("restic check 失败", result.exitCode, result.stderr))
+            } else {
+                bridgeRunner.withBridge(
+                    backend, backendUrl, backendUser, backendPass, backendShare,
+                    backendDomain, repoPath, File(cacheDir)
+                ) { bridgeUrl, authToken ->
+                    val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                    val result = runner.runRestic(env, "check")
+                    if (result.exitCode == 0) AppResult.Success(result.stdout)
+                    else err(AppError.Restic("restic check 失败", result.exitCode, result.stderr))
+                }
             }
         }
 
@@ -78,19 +131,23 @@ class ResticMaintenance(
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> =
+    ): AppResult<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)
+            if (backend == "local") {
+                val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
                 val result = runner.runRestic(env, "stats")
-                if (result.exitCode == 0) Result.success(result.stdout)
-                else Result.failure(Exception("restic stats failed: ${result.stderr}"))
+                if (result.exitCode == 0) AppResult.Success(result.stdout)
+                else err(AppError.Restic("restic stats 失败", result.exitCode, result.stderr))
+            } else {
+                bridgeRunner.withBridge(
+                    backend, backendUrl, backendUser, backendPass, backendShare,
+                    backendDomain, repoPath, File(cacheDir)
+                ) { bridgeUrl, authToken ->
+                    val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                    val result = runner.runRestic(env, "stats")
+                    if (result.exitCode == 0) AppResult.Success(result.stdout)
+                    else err(AppError.Restic("restic stats 失败", result.exitCode, result.stderr))
+                }
             }
         }
 }

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

@@ -3,20 +3,33 @@ package com.example.androidbackupgui.backup
 import android.util.Log
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
+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 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(
@@ -27,38 +40,95 @@ 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)
+            if (backend == "local") {
+                val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
+                runInit(env)
+            } else {
+                bridgeRunner.withBridge(
+                    backend, backendUrl, backendUser, backendPass, backendShare,
+                    backendDomain, repoPath, File(cacheDir)
+                ) { bridgeUrl, authToken ->
+                    val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                    runInit(env)
                 }
-                // 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}"))
             }
         }
 
+    /** 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)
+                }
+            }
+            // 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. */

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

@@ -0,0 +1,402 @@
+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 -> {
+                when (val exists = transport.exists(remotePath)) {
+                    is AppResult.Success -> {
+                        if (exists.data) {
+                            val sizeResult = transport.fileSize(remotePath)
+                            val fileSize = if (sizeResult is AppResult.Success) sizeResult.data else 0L
+                            newFixedLengthResponse(
+                                Response.Status.OK, "application/octet-stream",
+                                ByteArrayInputStream(ByteArray(0)), fileSize
+                            )
+                        } else {
+                            newFixedLengthResponse(Response.Status.NOT_FOUND, "text/plain", "")
+                        }
+                    }
+                    is AppResult.Failure -> 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

@@ -3,27 +3,44 @@ package com.example.androidbackupgui.backup
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.withContext
+import kotlinx.coroutines.CancellationException
 import java.io.File
-import kotlinx.serialization.json.Json
 import kotlin.coroutines.coroutineContext
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
 
-/** 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.
+ * [RestBridgeRunner] which are shared across sub-modules.
+ *
+ * @property cacheDir Cache directory for restic env and bridge temp files; set by [ResticWrapper].
+ * @property backendDomain Domain for SMB NTLM authentication; set by [ResticWrapper].
  */
 class ResticRestore(
     private val runner: ResticCommandRunner,
     private val envResolver: ResticEnvResolver,
-    private val syncManager: RemoteSyncManager
+    private val bridgeRunner: RestBridgeRunner
 ) {
+    /** Cache directory for restic env and bridge temp files. Set by [ResticWrapper]. */
+    var cacheDir: String = ""
+
+    /** Domain for SMB NTLM authentication. Set by [ResticWrapper]. */
+    var backendDomain: String = ""
+
     // ── Restore ────────────────────────────────────────
 
+    /**
+     * Restore a snapshot to [targetPath], optionally filtered by [include] pattern.
+     *
+     * For local backends, builds env via [ResticEnvResolver.buildLocalEnv] and runs
+     * restic restore directly. For remote backends, proxies through [RestBridgeRunner]
+     * using a local REST bridge, building env via [ResticEnvResolver.buildBridgeEnv].
+     */
     suspend fun restore(
         repoPath: String,
         password: String,
@@ -35,22 +52,17 @@ 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) {
+    ): AppResult<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,
-        ) {
+
+        if (backend == "local") {
             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 env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
             val result = runner.runResticStreaming(env, args) { line ->
                 if (!coroutineContext.isActive) return@runResticStreaming
                 try {
@@ -64,16 +76,53 @@ class ResticRestore(
                             emit("恢复完成: ${progress.totalFiles} 个文件")
                         }
                     }
-                } catch (_: Exception) { emit(line) }
+                } catch (e: Exception) { if (e is CancellationException) throw e; emit(line) }
             }
 
-            if (result.exitCode == 0) Result.success(Unit)
-            else Result.failure(Exception("restic restore failed: ${result.stderr}"))
+            if (result.exitCode == 0) AppResult.Success(Unit)
+            else err(AppError.Restic("restic restore 失败", result.exitCode, result.stderr))
+        } else {
+            bridgeRunner.withBridge(
+                backend, backendUrl, backendUser, backendPass, backendShare, backendDomain,
+                repoPath, File(cacheDir)
+            ) { bridgeUrl, authToken ->
+                File(targetPath).mkdirs()
+
+                val args = mutableListOf("restore", snapshotId, "--target", targetPath, "--json")
+                if (include != null) { args.add("--include"); args.add(include) }
+
+                val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                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 (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 ──────────────────────────────────────
 
+    /**
+     * Dump the contents of a single file from a snapshot.
+     *
+     * For local backends, builds env via [ResticEnvResolver.buildLocalEnv] and runs
+     * restic dump directly. For remote backends, proxies through [RestBridgeRunner]
+     * using a local REST bridge, building env via [ResticEnvResolver.buildBridgeEnv].
+     */
     suspend fun dump(
         repoPath: String,
         password: String,
@@ -83,19 +132,23 @@ class ResticRestore(
         backendUrl: String = "",
         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)
+        backendShare: String = ""
+    ): AppResult<String> = withContext(Dispatchers.IO) {
+        if (backend == "local") {
+            val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
             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}" }))
+            if (result.exitCode == 0) AppResult.Success(result.stdout)
+            else err(AppError.Restic(result.stderr.ifEmpty { "restic dump 失败" }, result.exitCode, result.stderr))
+        } else {
+            bridgeRunner.withBridge(
+                backend, backendUrl, backendUser, backendPass, backendShare, backendDomain,
+                repoPath, File(cacheDir)
+            ) { bridgeUrl, authToken ->
+                val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                val result = 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

@@ -2,24 +2,34 @@ package com.example.androidbackupgui.backup
 
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
-import kotlinx.serialization.json.Json
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
+import java.io.File
 
 
-/** 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).
+ * [listSnapshots] is download-only; [forget] removes snapshots from the remote.
+ *
+ * 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.
+ *
  * Delegates execution to [ResticCommandRunner], [ResticEnvResolver], and
- * [RemoteSyncManager] which are shared across sub-modules.
+ * [RestBridgeRunner] which are shared across sub-modules.
  */
 class ResticSnapshotOps(
     private val runner: ResticCommandRunner,
     private val envResolver: ResticEnvResolver,
-    private val syncManager: RemoteSyncManager
+    private val bridgeRunner: RestBridgeRunner
 ) {
+    /** 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 = ""
+
     // ── List snapshots ─────────────────────────────────
 
     suspend fun listSnapshots(
@@ -31,31 +41,49 @@ 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) {
+        if (backend == "local") {
             val args = mutableListOf("snapshots", "--json")
             if (tag != null) { args.add("--tag"); args.add(tag) }
 
-            val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
+            val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
             val result = 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 })
+                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 ?: ""))
+            }
+        } else {
+            bridgeRunner.withBridge(
+                backend, backendUrl, backendUser, backendPass, backendShare,
+                backendDomain, repoPath, File(cacheDir)
+            ) { bridgeUrl, authToken ->
+                val args = mutableListOf("snapshots", "--json")
+                if (tag != null) { args.add("--tag"); args.add(tag) }
+
+                val env = envResolver.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                val result = runner.runRestic(env, args)
+
+                if (result.exitCode != 0) {
+                    return@withBridge err(AppError.Restic("restic snapshots 失败", result.exitCode, result.stderr))
+                }
+
+                try {
+                    val snapshots = resticJson.decodeFromString<List<ResticWrapper.ResticSnapshot>>(
+                        result.stdout.ifEmpty { "[]" }
+                    )
+                    AppResult.Success(snapshots.sortedByDescending { it.time })
+                } catch (e: Exception) {
+                    err(AppError.Parse("解析快照 JSON 失败", e.message ?: ""))
+                }
             }
         }
     }
@@ -74,14 +102,8 @@ 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,
-        ) {
+    ): AppResult<String> = withContext(Dispatchers.IO) {
+        if (backend == "local") {
             val args = mutableListOf(
                 "forget",
                 "--keep-daily", keepDaily.toString(),
@@ -90,11 +112,30 @@ class ResticSnapshotOps(
             )
             if (dryRun) args.add("--dry-run")
 
-            val env = envResolver.buildFullEnv(repoPath, password, backend, backendUrl, backendUser, backendPass, backendShare, syncManager.tempRepoDir)
+            val env = envResolver.buildLocalEnv(repoPath, password, cacheDir)
             val result = 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))
+        } else {
+            bridgeRunner.withBridge(
+                backend, backendUrl, backendUser, backendPass, backendShare,
+                backendDomain, repoPath, File(cacheDir)
+            ) { bridgeUrl, authToken ->
+                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.buildBridgeEnv(password, bridgeUrl, cacheDir, authToken)
+                val result = runner.runRestic(env, args)
+
+                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/ResticWrapper.kt

@@ -5,9 +5,13 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.isActive
 import java.io.File
 import kotlinx.coroutines.withContext
+import org.json.JSONObject
 import kotlin.coroutines.coroutineContext
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.SerialName
+import com.example.androidbackupgui.backup.AppError
+import com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.err
 
 /**
  * Wraps the restic CLI binary for backup/restore operations.
@@ -15,13 +19,14 @@ 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]).
  */
@@ -31,15 +36,15 @@ object ResticWrapper {
 
     private val runner = ResticCommandRunner()
     private val envResolver = ResticEnvResolver()
-    private val syncManager = RemoteSyncManager()
+    private val bridgeRunner = RestBridgeRunner()
 
     // ── 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)
+    private val backupOp = ResticBackup(runner, envResolver, bridgeRunner)
+    private val restoreOp = ResticRestore(runner, envResolver, bridgeRunner)
+    private val snapshotOps = ResticSnapshotOps(runner, envResolver, bridgeRunner)
+    private val maintenance = ResticMaintenance(runner, envResolver, bridgeRunner)
 
     // ── Property delegation ───────────────────────────
 
@@ -48,16 +53,28 @@ object ResticWrapper {
         get() = runner.binaryPath
         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 }
+    /** 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. */
-    var backendDomain: String
-        get() = syncManager.backendDomain
-        set(v) { syncManager.backendDomain = 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
@@ -81,6 +98,13 @@ object ResticWrapper {
         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 ─────────────────────────
 
     suspend fun init(
@@ -91,11 +115,8 @@ 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 ─────────────────────────────────────────
@@ -129,13 +150,32 @@ 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(
+    ): AppResult<BackupSummary> = backupOp.backup(
         repoPath, password, paths, tags, hostname,
         backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress, onProgress
+        onProgress
+    )
+
+    // ── Streaming backup (stdin) ─────────────────────
+
+    suspend fun backupStdin(
+        repoPath: String,
+        password: String,
+        stdinFile: File,
+        extraPaths: List<String>,
+        tags: List<String> = emptyList(),
+        hostname: String? = null,
+        backend: String = "local",
+        backendUrl: String = "",
+        backendUser: String = "",
+        backendPass: String = "",
+        backendShare: String = "",
+        onProgress: suspend (ResticProgress) -> Unit = {}
+    ): AppResult<BackupSummary> = backupOp.backupStdin(
+        repoPath, password, stdinFile, extraPaths, tags, hostname,
+        backend, backendUrl, backendUser, backendPass, backendShare,
+        onProgress
     )
 
     // ── Restore ────────────────────────────────────────
@@ -151,13 +191,11 @@ 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(
+    ): AppResult<Unit> = restoreOp.restore(
         repoPath, password, snapshotId, targetPath, include,
         backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress, onProgress
+        onProgress
     )
 
     // ── File dump ──────────────────────────────────────
@@ -172,12 +210,9 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = restoreOp.dump(
+    ): AppResult<String> = restoreOp.dump(
         repoPath, password, snapshotId, filePath,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
+        backend, backendUrl, backendUser, backendPass, backendShare
     )
 
     // ── Snapshot management ────────────────────────────
@@ -191,12 +226,9 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<List<ResticSnapshot>> = snapshotOps.listSnapshots(
+    ): AppResult<List<ResticSnapshot>> = snapshotOps.listSnapshots(
         repoPath, password, tag,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
+        backend, backendUrl, backendUser, backendPass, backendShare
     )
 
     suspend fun forget(
@@ -211,14 +243,81 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = snapshotOps.forget(
+    ): AppResult<String> = snapshotOps.forget(
         repoPath, password, keepDaily, keepWeekly, keepMonthly, dryRun,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
+        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 ────────────────────────────────────
 
     suspend fun prune(
@@ -229,12 +328,9 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = maintenance.prune(
+    ): AppResult<String> = maintenance.prune(
         repoPath, password,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
+        backend, backendUrl, backendUser, backendPass, backendShare
     )
 
     suspend fun check(
@@ -245,12 +341,9 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = maintenance.check(
+    ): AppResult<String> = maintenance.check(
         repoPath, password,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
+        backend, backendUrl, backendUser, backendPass, backendShare
     )
 
     suspend fun stats(
@@ -261,28 +354,29 @@ object ResticWrapper {
         backendUser: String = "",
         backendPass: String = "",
         backendShare: String = "",
-        onSyncProgress: suspend (RemoteTransport.TransferProgress) -> Unit = {},
-        onByteSyncProgress: suspend (RemoteTransport.ByteProgress) -> Unit = {},
-    ): Result<String> = maintenance.stats(
+    ): AppResult<String> = maintenance.stats(
         repoPath, password,
-        backend, backendUrl, backendUser, backendPass, backendShare,
-        onSyncProgress, onByteSyncProgress
+        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()
-    }
 }

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

@@ -1,12 +1,13 @@
 package com.example.androidbackupgui.backup
 import com.example.androidbackupgui.root.RootShell
 import com.example.androidbackupgui.root.shellEscape
+import android.content.Context
 import android.util.Log
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.withContext
 import java.io.File
-import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.supervisorScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Semaphore
 import kotlinx.coroutines.sync.withPermit
@@ -42,6 +43,7 @@ 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,
@@ -50,6 +52,11 @@ object RestoreOperation {
         val emit: suspend (RestoreProgress) -> Unit = { p -> withContext(Dispatchers.Main) { onProgress(p) } }
         val startTime = System.currentTimeMillis()
 
+        // 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"
+
         // Read app list from backup
         val appListFile = File(backupDir, "appList.txt")
         val allPackages = if (appListFile.exists()) {
@@ -69,12 +76,13 @@ object RestoreOperation {
         } else {
             allPackages
         }
+        LogUtil.i(TAG, "restoreApps: starting restore of ${packages.size} packages from ${backupDir.absolutePath}")
 
         val successAtomic = AtomicInteger(0)
         val failAtomic = AtomicInteger(0)
 
         val semaphore = Semaphore(2)
-        coroutineScope {
+        supervisorScope {
             packages.forEachIndexed { index, pkg ->
                 launch {
                     if (!coroutineContext.isActive) return@launch
@@ -87,7 +95,7 @@ object RestoreOperation {
 
                         // 1. Install APK
                         emit(RestoreProgress(index + 1, packages.size, pkg, "install", "正在安装 APK…"))
-                        val installed = installApk(appBackupDir)
+                        val installed = installApk(pkg, appBackupDir)
 
                         if (!installed) {
                             failAtomic.incrementAndGet()
@@ -100,11 +108,11 @@ object RestoreOperation {
 
                         // 3. Restore data
                         emit(RestoreProgress(index + 1, packages.size, pkg, "data", "正在恢复数据…"))
-                        restoreData(appBackupDir)
+                        restoreData(pkg, userId, appBackupDir, tarCmd, zstdCmd)
 
                         // 4. Restore OBB
                         emit(RestoreProgress(index + 1, packages.size, pkg, "obb", "正在恢复 OBB…"))
-                        restoreObb(pkg, appBackupDir)
+                        restoreObb(pkg, appBackupDir, tarCmd, zstdCmd)
 
                         // 5. Restore SSAID
                         emit(RestoreProgress(index + 1, packages.size, pkg, "ssaid", "正在恢复 SSAID…"))
@@ -125,10 +133,13 @@ object RestoreOperation {
         }
 
         val elapsed = System.currentTimeMillis() - startTime
-        RestoreResult(successAtomic.get(), failAtomic.get(), elapsed)
+        val successCount = successAtomic.get()
+        val failCount = failAtomic.get()
+        LogUtil.i(TAG, "restoreApps: completed — success=$successCount fail=$failCount elapsed=${elapsed}ms")
+        RestoreResult(successCount, failCount, elapsed)
     }
 
-    private suspend fun installApk(appDir: File): Boolean {
+    private suspend fun installApk(packageName: String, appDir: File): Boolean {
         // Find APK files
         val apkFiles = appDir.listFiles()
             ?.filter { it.name.endsWith(".apk") }
@@ -137,33 +148,68 @@ object RestoreOperation {
 
         if (apkFiles.isEmpty()) return false
 
-        // Build install command for multiple APKs (split APK support)
-        val apkPaths = apkFiles.joinToString(" ") { "'${it.absolutePath.shellEscape()}'" }
+        suspend fun doInstall(): Boolean {
+            // Build install command for multiple APKs (split APK support)
+            val apkPaths = apkFiles.joinToString(" ") { "'${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("]")
+            // 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()}'")
+                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 '${sessionId.shellEscape()}'")
+                    return commit.isSuccess
                 }
-                val commit = RootShell.exec("pm install-commit '${sessionId.shellEscape()}'")
-                return commit.isSuccess
             }
+
+            // Single APK install
+            val result = RootShell.exec("pm install -r -t $apkPaths")
+            return result.isSuccess
         }
 
-        // Single APK install
-        val result = RootShell.exec("pm install -r -t $apkPaths")
-        return result.isSuccess
+        suspend fun isInstalled(): Boolean {
+            val verifyResult = RootShell.exec("pm list packages '${packageName.shellEscape()}' 2>/dev/null")
+            return verifyResult.output.contains(packageName)
+        }
+
+        // First install attempt
+        val firstOk = doInstall()
+        if (!firstOk) {
+            Log.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
+        }
+
+        Log.w(TAG, "installApk: $packageName installed but not detected — retrying once")
+        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) {
+    private suspend fun restoreData(packageName: String, userId: String, appDir: File, tarCmd: String, zstdCmd: String) {
         val files = appDir.listFiles()
         if (files.isNullOrEmpty()) {
             Log.w(TAG, "restoreData: appDir empty or null: ${appDir.absolutePath}")
@@ -174,27 +220,60 @@ object RestoreOperation {
             Log.w(TAG, "restoreData: no _data.tar in ${appDir.name}, found: ${files.map { it.name }}")
             return
         }
+
+        // Build exclusion patterns for cache/temp directories
+        val dataPaths = listOf("/data/data/$packageName", "/data/user_de/$userId/$packageName")
+        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)) {
+            if (!isArchiveSafe(archive, zstdCmd)) {
                 Log.w(TAG, "restoreData: archive NOT SAFE, skipping: ${archive.name}")
                 continue
             }
-            val cmd = when {
+
+            // Build the extract command with exclusion flags
+            val baseCmd = when {
                 archive.name.endsWith(".zst") ->
-                    "zstd -d -c '$archivePath' | tar -xf - -C / 2>/dev/null"
+                    "set -o pipefail; $zstdCmd -d -c '$archivePath' | $tarCmd -xf - $excludeArgs -C / 2>/dev/null"
                 archive.name.endsWith(".gz") ->
-                    "tar -xzf '$archivePath' -C / 2>/dev/null"
+                    "$tarCmd -xzf $excludeArgs '$archivePath' -C / 2>/dev/null"
                 archive.name.endsWith(".tar") ->
-                    "tar -xf '$archivePath' -C / 2>/dev/null"
+                    "$tarCmd -xf $excludeArgs '$archivePath' -C / 2>/dev/null"
                 else -> { Log.w(TAG, "restoreData: unknown archive type ${archive.name}"); continue }
             }
-            val result = RootShell.exec(cmd)
+
+            val result = RootShell.exec(baseCmd)
             if (result.isSuccess) {
                 Log.i(TAG, "restoreData: extracted ${archive.name}")
             } else {
                 Log.e(TAG, "restoreData: FAILED ${archive.name}: exit=${result.exitCode} err=${result.error}")
+                // Continue to try SELinux fix even if extraction had issues
+            }
+        }
+
+        // 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 $dataPath")
             }
         }
     }
@@ -204,97 +283,77 @@ object RestoreOperation {
      * or symbolic links pointing outside the tree.
      * Accepts both absolute and relative paths — tar implementations vary.
      */
-    private suspend fun isArchiveSafe(archive: File): Boolean {
+    private suspend fun isArchiveSafe(archive: File, zstdCmd: String = "zstd"): Boolean {
         val listCmd = if (archive.name.endsWith(".zst")) {
-            "zstd -d -c '${archive.absolutePath.shellEscape()}' | tar tf - 2>/dev/null"
+            "set -o pipefail; $zstdCmd -d -c '${archive.absolutePath.shellEscape()}' | tar tf - 2>/dev/null"
         } else {
             "tar tf '${archive.absolutePath.shellEscape()}' 2>/dev/null"
         }
-        val result = RootShell.exec(listCmd)
+        var result = RootShell.exec(listCmd)
+        // Fallback: try without pipefail (some Android shells don't support it)
+        if (!result.isSuccess && archive.name.endsWith(".zst")) {
+            val fallbackCmd = "$zstdCmd -d -c '${archive.absolutePath.shellEscape()}' 2>/dev/null | tar tf - 2>/dev/null"
+            result = RootShell.exec(fallbackCmd)
+        }
         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
+            path.trimStart('/').split("/").any { segment -> segment == ".." }
         }
     }
 
-    private suspend fun restoreObb(packageName: String, appDir: File) {
+    private suspend fun restoreObb(packageName: String, appDir: File, tarCmd: String, zstdCmd: String) {
         val obbFiles = appDir.listFiles()
             ?.filter { it.name.contains("_obb.tar") }
             ?: return
 
+        if (obbFiles.isEmpty()) return
+
+        // 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()}/$it/*'" }
+
         for (archive in obbFiles) {
-            if (!isArchiveSafe(archive)) continue
+            if (!isArchiveSafe(archive, zstdCmd)) continue
             val archivePath = archive.absolutePath.shellEscape()
             when {
                 archive.name.endsWith(".zst") -> {
-                    RootShell.exec("zstd -d -c '$archivePath' | tar -xf - -C / 2>/dev/null")
+                    RootShell.exec("set -o pipefail; $zstdCmd -d -c '$archivePath' | $tarCmd -xf - $excludeArgs -C / 2>/dev/null")
                 }
                 archive.name.endsWith(".gz") -> {
-                    RootShell.exec("tar -xzf '$archivePath' -C / 2>/dev/null")
+                    RootShell.exec("$tarCmd -xzf $excludeArgs '$archivePath' -C / 2>/dev/null")
                 }
                 archive.name.endsWith(".tar") -> {
-                    RootShell.exec("tar -xf '$archivePath' -C / 2>/dev/null")
+                    RootShell.exec("$tarCmd -xf $excludeArgs '$archivePath' -C / 2>/dev/null")
                 }
             }
         }
 
-        // 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")
+        Log.i(TAG, "restoreObb: set ownership to $gid:$gid on $obbPath")
     }
 
     private suspend fun restoreSsaid(packageName: String, appDir: File, userId: String) {
         val ssaidFile = File(appDir, "ssaid.txt")
         if (!ssaidFile.exists()) return
 
-        val ssaidLine = ssaidFile.readText().trim()
-        if (ssaidLine.isBlank()) return
+        val ssaidValue = ssaidFile.readText().trim()
+        if (ssaidValue.isBlank()) return
 
-        val targetFile = "/data/system/users/${userId.shellEscape()}/settings_ssaid.xml"
-        val pkgEsc = packageName.shellEscape()
-        val ssaidEsc = ssaidLine.shellEscape()
-
-        // Remove existing entry for this package, insert new one before </settings>
-        RootShell.exec(
-            "grep -v '${pkgEsc}' '$targetFile' > '$targetFile.tmp' && " +
-            "sed -i '\$ i ${ssaidEsc}' '$targetFile.tmp' && " +
-            "mv '$targetFile.tmp' '$targetFile'"
-        )
-    }
-
-    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(".") }
-                }
-        } catch (_: Exception) { emptyList() }
-
-        val pkgEsc = packageName.shellEscape()
-        for (perm in perms) {
-            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 — ${result.output}")
-            }
+        // SSAID is a hex token. Reject anything else so it can never break out of
+        // the sed expression below (shellEscape only protects single-quote context,
+        // not the double-quoted sed string).
+        if (!ssaidValue.matches(Regex("^[0-9a-fA-F]+$"))) {
+            Log.w(TAG, "restoreSsaid: ssaid value is not hex, skipping XML edit for $packageName")
+            return
         }
-    }
 
-    private suspend fun fixDataOwnership(packageName: String, userId: String) {
-        val pkgEsc = packageName.shellEscape()
-        val uidEsc = userId.shellEscape()
-        val uidResult = RootShell.exec("dumpsys package '$pkgEsc' | grep 'userId=' | head -1")
+        // Resolve the app's UID
+        val uidResult = RootShell.exec("dumpsys package '${packageName.shellEscape()}' | grep 'userId=' | head -1")
         val uid = uidResult.output
             .substringAfter("userId=", "")
             .substringBefore(" ")
@@ -302,11 +361,172 @@ object RestoreOperation {
             .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")
+        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: ${result.error}")
+            }
+        }
+    }
+
+    private suspend fun restorePermissions(packageName: String, appDir: File) {
+        val permFile = File(appDir, "permissions.txt")
+        if (!permFile.exists()) return
+
+        // Parse permissions from dumpsys output.
+        // Format: "android.permission.XXX: granted=true" or "android.permission.XXX: granted=false"
+        val parsedPerms = try {
+            permFile.readLines().mapNotNull { line ->
+                val name = line.substringBefore(":").trim().takeIf { it.isNotEmpty() && it.contains(".") } ?: return@mapNotNull null
+                val granted = line.contains("granted=true")
+                Pair(name, granted)
+            }
+        } catch (_: Exception) { emptyList() }
+
+        if (parsedPerms.isEmpty()) return
+
+        val pkgEsc = packageName.shellEscape()
+
+        // NOTE: Intentionally skipping "appops reset" because we don't capture
+        // app ops state (battery optimization, notification settings, etc.)
+        // in the backup. Resetting would lose those user customizations.
+
+        val grantedPerms = parsedPerms.filter { it.second }.map { it.first }
+        val deniedPerms = parsedPerms.filter { !it.second }.map { it.first }
+
+        // Grant runtime permissions that were previously granted
+        for (perm in grantedPerms) {
+            val result = RootShell.exec("pm grant '$pkgEsc' '${perm.shellEscape()}' 2>&1")
+            if (!result.isSuccess) {
+                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 $packageName")
+    }
+
+    /** Resolve app UID using multiple methods for robustness across Android versions. */
+    private suspend fun resolveAppUid(packageName: String): Int? {
+        val pkgEsc = packageName.shellEscape()
+        // Method 1: pm list packages -U (reliable, consistent output format)
+        val pmResult = RootShell.exec("pm list packages -U 2>/dev/null | grep '${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 uid = resolveAppUid(packageName)
+        if (uid == null) {
+            Log.w(TAG, "fixDataOwnership: could not resolve UID for $packageName — data will be inaccessible")
+            return
+        }
+
+        // USER and USER_DE use uid:uid (app's own group)
+        val dataPaths = listOf(
+            "/data/data/$pkgEsc",
+            "/data/user_de/$uidEsc/$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/StreamingBackup.kt

@@ -0,0 +1,124 @@
+package com.example.androidbackupgui.backup
+
+import android.util.Log
+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 kotlin.coroutines.coroutineContext
+
+/**
+ * Streaming backup orchestrator.
+ *
+ * Uses a FIFO (named pipe) to pipe app data tar output directly into
+ * `restic backup --stdin`, eliminating the staging directory for large
+ * data backups.
+ */
+object StreamingBackup {
+
+    private const val TAG = "StreamingBackup"
+
+    data class StreamingResult(
+        val apkPaths: List<String>,     // APK paths (backed up directly by restic)
+        val dataFifo: File,             // FIFO path for app data tar
+        val metaDir: File               // Metadata directory (~1MB)
+    )
+
+    /**
+     * Prepare streaming backup configuration.
+     *
+     * Creates the FIFO and metadata directory, collects APK paths.
+     *
+     * @param cacheDir Directory to place FIFO and temp files
+     * @param apps List of apps being backed up
+     * @param legacyApps Metadata from previous snapshot
+     */
+    suspend fun prepareStreaming(
+        cacheDir: File,
+        apps: List<AppInfo>,
+        legacyApps: Map<String, ResticWrapper.SnapshotAppInfo>?
+    ): StreamingResult = withContext(Dispatchers.IO) {
+        cacheDir.mkdirs()
+
+        // Create FIFO for data pipe
+        val fifo = File(cacheDir, "app_data_stream.fifo")
+        // Remove stale FIFO if present
+        if (fifo.exists()) fifo.delete()
+        // mkfifo requires root on Android
+        RootShell.exec("mkfifo '${fifo.absolutePath.shellEscape()}'")
+        Log.i(TAG, "FIFO created at ${fifo.absolutePath}")
+
+        // Collect APK paths
+        val apkPaths = mutableListOf<String>()
+        for (app in apps) {
+            val paths = AppScanner.getApkPaths(app.packageName.value)
+            apkPaths.addAll(paths)
+        }
+
+        // Create metadata directory
+        val metaDir = File(cacheDir, "streaming_meta")
+        metaDir.mkdirs()
+
+        // Write app list
+        val appListFile = File(metaDir, "appList.txt")
+        appListFile.writeText(apps.joinToString("\n") { it.packageName.value })
+
+        // Write app_details.json
+        val metaFile = File(metaDir, "app_details.json")
+        metaFile.writeText(BackupOperation.buildAppDetailsJson(apps, legacyApps))
+
+        Log.i(TAG, "Streaming prepared: ${apkPaths.size} APKs, FIFO at ${fifo.absolutePath}")
+        StreamingResult(apkPaths, fifo, metaDir)
+    }
+
+    /**
+     * Launch the data producer in a root shell background process.
+     *
+     * For each app, runs `tar -cf - /data/data/pkg 2>/dev/null` and appends
+     * to the FIFO. The FIFO is consumed by `restic backup --stdin`.
+     *
+     * @param apps Apps whose data directories to tar
+     * @param noDataBackup Set of package names to exclude from data backup
+     * @param userId Android user ID
+     * @param fifoPath Path to the FIFO
+     */
+    suspend fun launchDataProducer(
+        apps: List<AppInfo>,
+        noDataBackup: Set<String>,
+        @Suppress("UNUSED_PARAMETER") userId: String,
+        fifoPath: String
+    ): Boolean = withContext(Dispatchers.IO) {
+        val fifoEsc = fifoPath.shellEscape()
+
+        for (app in apps) {
+            if (!coroutineContext.isActive) return@withContext false
+
+            val pkgName = app.packageName.value
+            if (pkgName in noDataBackup) {
+                Log.d(TAG, "Skipping data for $pkgName (excluded)")
+                continue
+            }
+
+            val dataDir = "/data/data/$pkgName"
+            // Check if data directory exists
+            val existsResult = RootShell.exec("[ -d '${dataDir.shellEscape()}' ] && echo 1 || echo 0")
+            if (existsResult.output.trim() != "1") {
+                Log.d(TAG, "No data directory for $pkgName, skipping")
+                continue
+            }
+
+            // Append tar output to FIFO. `>>` blocks until consumer reads.
+            val cmd = "tar -cf - '$dataDir' 2>/dev/null >> '$fifoEsc'"
+            Log.d(TAG, "Streaming data for $pkgName: $cmd")
+            val result = RootShell.exec(cmd)
+            if (!result.isSuccess) {
+                Log.w(TAG, "Data backup failed for $pkgName: ${result.error}")
+            }
+        }
+
+        Log.i(TAG, "Data producer completed")
+        true
+    }
+}

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 +1,8 @@
+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")
+}

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

@@ -0,0 +1,66 @@
+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.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.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.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 +1,349 @@
+package com.example.androidbackupgui.ui
+
+import android.content.Intent
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import android.util.Log
+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.core.content.ContextCompat
+import com.example.androidbackupgui.backup.*
+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 com.example.androidbackupgui.backup.AppResult
+import com.example.androidbackupgui.backup.ResticBinary
+import com.example.androidbackupgui.backup.WifiManager
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.util.Locale
+
+private enum class SortMode { NAME_ASC, SIZE_DESC }
+
+@Composable
+fun BackupScreen() {
+    val context = LocalContext.current
+    val scope = rememberCoroutineScope()
+
+    // ── State ──
+    var config by remember { mutableStateOf(BackupConfig()) }
+    var allApps by remember { mutableStateOf<List<AppInfo>>(emptyList()) }
+    var sortedApps by remember { mutableStateOf<List<AppInfo>>(emptyList()) }
+    var selectedApps by remember { mutableStateOf<Set<String>>(emptySet()) }
+    var excludeDataFromBackup by remember { mutableStateOf<Set<String>>(emptySet()) }
+    var sortMode by remember { mutableStateOf(SortMode.NAME_ASC) }
+    var showSystemApps by remember { mutableStateOf(false) }
+    var statusText by remember { mutableStateOf("请先扫描应用") }
+    var isRunning by remember { mutableStateOf(false) }
+    var isScanning by remember { mutableStateOf(false) }
+
+    // Load config
+    LaunchedEffect(Unit) {
+        config = BackupConfig.fromFile(File(context.filesDir, "backup_settings.conf"))
+    }
+
+    // Re-apply sort/filter when dependencies change
+    LaunchedEffect(allApps, sortMode, showSystemApps) {
+        val filtered = if (showSystemApps) allApps else allApps.filter { !it.isSystem }
+        val sorted = when (sortMode) {
+            SortMode.NAME_ASC -> filtered.sortedBy { it.label.lowercase(Locale.US) }
+            SortMode.SIZE_DESC -> filtered.sortedByDescending { it.backupSize }
+        }
+        sortedApps = sorted
+    }
+
+    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 = {
+                            isScanning = true
+                            statusText = "正在扫描应用…"
+                            scope.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 (showSystemApps) thirdParty + system else thirdParty
+                                    allApps = apps
+                                    selectedApps = apps.map { it.packageName.value }.toSet()
+                                    statusText = "共找到 ${apps.size} 个应用，全部已选中"
+                                } catch (e: Exception) {
+                                    statusText = "扫描应用失败: ${e.message}"
+                                } finally {
+                                    isScanning = false
+                                }
+                            }
+                        },
+                        enabled = !isScanning && !isRunning,
+                        modifier = Modifier.weight(1f)
+                    ) {
+                        if (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 = sortMode == SortMode.NAME_ASC,
+                        onClick = {
+                            sortMode = SortMode.NAME_ASC
+                        },
+                        label = { Text("A-Z") },
+                        leadingIcon = {
+                            Icon(Icons.Default.SortByAlpha, contentDescription = null, modifier = Modifier.size(16.dp))
+                        }
+                    )
+                    FilterChip(
+                        selected = sortMode == SortMode.SIZE_DESC,
+                        onClick = {
+                            sortMode = 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 = {
+                        selectedApps = sortedApps.map { it.packageName.value }.toSet()
+                    }) { Text("全选") }
+                    TextButton(onClick = { selectedApps = emptySet() }) { 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 = showSystemApps, onCheckedChange = { showSystemApps = it })
+                }
+            }
+        }
+
+        // ── 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(sortedApps, key = { it.packageName.value }) { app ->
+                AppListItem(
+                    app = app,
+                    isSelected = app.packageName.value in selectedApps,
+                    isDataExcluded = app.packageName.value in excludeDataFromBackup,
+                    onToggle = { checked ->
+                        selectedApps = if (checked) selectedApps + app.packageName.value
+                        else selectedApps - app.packageName.value
+                    },
+                    onExcludeDataToggle = { excluded ->
+                        excludeDataFromBackup = if (excluded) excludeDataFromBackup + app.packageName.value
+                        else excludeDataFromBackup - app.packageName.value
+                    }
+                )
+            }
+        }
+
+        // ── Bottom bar with backup button ──
+        Surface(
+            modifier = Modifier.fillMaxWidth(),
+            tonalElevation = 3.dp
+        ) {
+            Button(
+                onClick = {
+                    val toBackup = allApps.filter { it.packageName.value in selectedApps }
+                        if (toBackup.isEmpty()) return@Button
+                        isRunning = true
+                        statusText = "开始备份 ${toBackup.size} 个应用…"
+
+                        scope.launch {
+                            try {
+                                // 1. Start foreground service
+                                val serviceIntent = Intent(context, BackupService::class.java).apply {
+                                    action = ACTION_START_BACKUP
+                                    putExtra(EXTRA_STATUS_TEXT, "正在备份 ${toBackup.size} 个应用…")
+                                }
+                                try {
+                                    ContextCompat.startForegroundService(context, serviceIntent)
+                                } catch (_: Exception) {}
+
+                                // 2. Execute backup
+                                val outputDir = File(config.outputPath.ifEmpty {
+                                    context.filesDir.absolutePath
+                                })
+                                val backupResult = withContext(Dispatchers.IO) {
+                                    BackupOperation.backupApps(
+                                        context = context,
+                                        apps = toBackup,
+                                        config = config,
+                                        outputDir = outputDir,
+                                        userId = config.backupUserId.toString(),
+                                        noDataBackup = excludeDataFromBackup,
+                                        onProgress = { progress ->
+                                            statusText = "[${progress.current}/${progress.total}] ${progress.packageName}: ${progress.message}"
+                                        }
+                                    )
+                                }
+                                statusText = "备份完成！成功: ${backupResult.successCount} 失败: ${backupResult.failCount} 耗时: ${backupResult.elapsedMs / 1000}s"
+
+                                // 3. WiFi 备份
+                                WifiManager.backup(File(backupResult.outputDir))
+
+                                // 4. Restic 上传（如启用）
+                                if (config.resticEnabled == 1 && config.resticRepo.isNotBlank()) {
+                                    val binaryPath = ResticBinary.prepare(context)
+                                    if (binaryPath != null) {
+                                        ResticWrapper.binaryPath = binaryPath
+                                        ResticWrapper.cacheDir = context.cacheDir.absolutePath
+                                        ResticWrapper.backendDomain = config.resticBackendDomain
+
+                                        statusText = "正在写入 restic 去重仓库…"
+                                        val resticResult = withContext(Dispatchers.IO) {
+                                            ResticWrapper.backup(
+                                                repoPath = config.resticRepo,
+                                                password = config.resticPassword,
+                                                paths = listOf(backupResult.outputDir),
+                                                tags = listOf("backup_${System.currentTimeMillis() / 1000}"),
+                                                hostname = "android-backup-gui",
+                                                backend = config.resticBackend,
+                                                backendUrl = config.resticBackendUrl,
+                                                backendUser = config.resticBackendUser,
+                                                backendPass = config.resticBackendPass,
+                                                backendShare = config.resticBackendShare,
+                                                onProgress = { progress ->
+                                                    if (progress.messageType == "status") {
+                                                        statusText = "去重仓库: %.0f%% (%d/%d 个文件)".format(
+                                                            progress.percentDone * 100,
+                                                            progress.filesDone,
+                                                            progress.totalFiles
+                                                        )
+                                                    }
+                                                }
+                                            )
+                                        }
+                                        when (resticResult) {
+                                            is AppResult.Success -> {
+                                                val summary = resticResult.getOrNull()
+                                                statusText = buildString {
+                                                    appendLine("备份完成！")
+                                                    appendLine("成功: ${backupResult.successCount} 失败: ${backupResult.failCount}")
+                                                    appendLine("耗时: ${backupResult.elapsedMs / 1000}秒")
+                                                    appendLine("Restic ID: ${summary?.snapshotId?.take(8)}…")
+                                                    if (summary != null) {
+                                                        appendLine("新增: ${summary.dataAdded / 1024 / 1024} MB")
+                                                    }
+                                                }
+                                            }
+                                            is AppResult.Failure -> {
+                                                statusText = "restic 快照失败: ${resticResult.errorOrNull()?.message}"
+                                            }
+                                        }
+                                    }
+                                }
+                            } catch (e: Exception) {
+                                val errMsg = e.message ?: "未知错误"
+                                Log.e("BackupScreen", "备份异常", e)
+                                val hint = when {
+                                    errMsg.contains("EPERM", ignoreCase = true) || errMsg.contains("Operation not permitted", ignoreCase = true) ->
+                                        "写入备份目录被拒绝，请检查输出路径权限或改用内置存储"
+                                    errMsg.contains("EACCES", ignoreCase = true) || errMsg.contains("Permission denied", ignoreCase = true) ->
+                                        "权限不足，请检查存储权限"
+                                    else -> null
+                                }
+                                statusText = if (hint != null) "备份异常: ${e.message} ($hint)" else "备份异常: ${e.message}"
+                            }
+                            finally {
+                                isRunning = false
+                                try {
+                                    val stopIntent = Intent(context, BackupService::class.java).apply {
+                                        action = ACTION_STOP_BACKUP
+                                    }
+                                    context.startService(stopIntent)
+                                } catch (_: Exception) {}
+                            }
+                        }
+                    },
+                enabled = !isRunning && selectedApps.isNotEmpty(),
+                modifier = Modifier.fillMaxWidth().padding(12.dp)
+            ) {
+                if (isRunning) {
+                    CircularProgressIndicator(modifier = Modifier.size(16.dp))
+                    Spacer(Modifier.width(8.dp))
+                }
+                Text("开始备份 (${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/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 +1,464 @@
+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) }
+
+    // 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
+    }
+
+    // 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"
+                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)
+    }
+
+    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 })
+                }
+                OutlinedTextField(
+                    value = outputPath,
+                    onValueChange = { outputPath = it },
+                    label = { Text("输出目录") },
+                    modifier = Modifier.fillMaxWidth(),
+                    singleLine = true
+                )
+                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
+                            )
+                        }
+
+                    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,
+                    )
+                )
+            },
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            Icon(Icons.Filled.Save, contentDescription = null)
+            Spacer(Modifier.width(8.dp))
+            Text("保存配置")
+        }
+
+        // ── Export config button ──
+        OutlinedButton(
+            onClick = { exportLauncher.launch("backup_settings.conf") },
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            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
+)

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

@@ -5,18 +5,23 @@ import android.util.Log
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.example.androidbackupgui.backup.BackupConfig
+import com.example.androidbackupgui.backup.formatSize
 import com.example.androidbackupgui.backup.ResticBinary
 import com.example.androidbackupgui.backup.ResticWrapper
-import com.example.androidbackupgui.backup.RemoteTransport
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.cancelAndJoin
 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(
@@ -41,7 +46,9 @@ 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. */
@@ -52,6 +59,23 @@ data class ResticForm(
     val backendShare: String, val backendDomain: String
 )
 
+/**
+ * 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
+}
+
 class ConfigViewModel(application: Application) : AndroidViewModel(application) {
 
     companion object {
@@ -75,22 +99,29 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
             )
         }
 
-        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)
@@ -122,10 +153,60 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
      * The caller passes the current form values as a [BackupConfig] copy.
      */
     fun save(formConfig: BackupConfig) {
-        viewModelScope.launch(Dispatchers.IO) {
-            BackupConfig.toFile(formConfig, configFile)
+        viewModelScope.launch {
+            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")) }
+            } else {
+                _operationEvents.emit(OperationEvent.ConfigExportFailed)
+                _uiState.update { it.copy(resticStatus = it.resticStatus.copy(message = "配置导出失败")) }
             }
         }
     }
@@ -136,13 +217,17 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
         val binaryPath = ResticBinary.prepare(ctx)
         if (binaryPath == null) return false
         ResticWrapper.binaryPath = binaryPath
-        ResticWrapper.tempRepoDir = ResticBinary.getTempRepoDir(ctx)
+        ResticWrapper.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()) {
@@ -164,27 +249,30 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
         ))}
 
         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 = {
+            try {
+                _operationEvents.emit(OperationEvent.InitStarted)
+                val result = ResticWrapper.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}", initButtonEnabled = true
+                        message = "仓库初始化成功: ${form.repo}"
                     ))}
                     refreshResticStatus(form)
-                },
-                onFailure = { e ->
-                    Log.e(TAG, "initResticRepo failed", e)
+                } 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: ${e.message}", initButtonEnabled = true
+                        message = "初始化失败: ${result.exceptionOrNull()?.message}"
                     ))}
+                    refreshResticStatus(form)
                 }
-            )
+            } finally {
+                initGuard.set(false)
+            }
         }
     }
 
@@ -208,29 +296,80 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
 
         _uiState.update { it.copy(resticStatus = it.resticStatus.copy(message = "正在检测仓库状态…")) }
 
-        viewModelScope.launch {
+        // Cancel any stale status check so a slow old coroutine doesn't overwrite new results
+        refreshJob?.cancel()
+        refreshJob = 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
+                    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
-                ))}
+                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 = ResticWrapper.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 = ResticWrapper.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 {
+            ResticWrapper.backendDomain = form.backendDomain
+            val result = ResticWrapper.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(
@@ -238,34 +377,36 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
         ))}
 
         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 = ResticWrapper.stats(form.repo, form.password,
+                    backend = form.backend, backendUrl = form.backendUrl,
+                    backendUser = form.backendUser, backendPass = form.backendPass,
+                    backendShare = form.backendShare,
+                )
+                val snapshotsResult = ResticWrapper.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)) }
+            }
         }
     }
 
@@ -276,64 +417,56 @@ class ConfigViewModel(application: Application) : AndroidViewModel(application)
         ))}
 
         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) {
+            try {
+                _operationEvents.emit(OperationEvent.PruneStarted)
+
+                // Remove stale locks before forget/prune
+                ResticWrapper.backendDomain = form.backendDomain
+                ResticWrapper.unlock(form.repo, form.password,
+                    backend = form.backend, backendUrl = form.backendUrl,
+                    backendUser = form.backendUser, backendPass = form.backendPass,
+                    backendShare = form.backendShare,
+                )
+
+                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,
+                )
+                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 = ResticWrapper.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 = "forget 失败: ${forgetResult.exceptionOrNull()?.message}",
+                    message = if (pruneResult.isSuccess)
+                        "清理完成！\n${pruneResult.getOrDefault("")}"
+                    else
+                        "prune 失败: ${pruneResult.exceptionOrNull()?.message}",
                     pruneButtonEnabled = true
                 ))}
-                return@launch
+                if (pruneResult.isSuccess) {
+                    _operationEvents.emit(OperationEvent.PruneCompleted)
+                } else {
+                    _operationEvents.emit(OperationEvent.PruneFailed)
+                }
+            } finally {
+                _uiState.update { it.copy(resticStatus = it.resticStatus.copy(pruneButtonEnabled = true)) }
             }
-
-            _uiState.update { it.copy(resticStatus = it.resticStatus.copy(message = "正在回收空间…")) }
-
-            val pruneResult = ResticWrapper.prune(form.repo, form.password,
-                backend = form.backend, backendUrl = form.backendUrl,
-                backendUser = form.backendUser, backendPass = form.backendPass,
-                backendShare = form.backendShare,
-                onSyncProgress = { p -> onSyncProgress(p) },
-                onByteSyncProgress = { p -> onByteProgress(p) },
-            )
-            _uiState.update { it.copy(resticStatus = it.resticStatus.copy(
-                message = if (pruneResult.isSuccess)
-                    "清理完成！\n${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/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 +1,444 @@
+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.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 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") }
+
+    // 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")
+                    }
+
+                    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 {
+                                    val result = withContext(Dispatchers.IO) {
+                                        ResticWrapper.listSnapshots(
+                                            config.resticRepo, config.resticPassword,
+                                            backend = config.resticBackend,
+                                            backendUrl = config.resticBackendUrl,
+                                            backendUser = config.resticBackendUser,
+                                            backendPass = config.resticBackendPass,
+                                            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) {
+                                        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,
+                                        )
+                                    }
+                                    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") }
+            }
+        )
+    }
+}
+
+// ── Sub-composables ──
+
+// ── Helper functions ──
+
+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 = if (appListFile.exists()) {
+            appListFile.readLines()
+                .map { it.trim() }
+                .filter { it.isNotEmpty() && !it.startsWith("#") }
+        } else {
+            dir.listFiles()
+                ?.filter { it.isDirectory }
+                ?.map { it.name }
+                ?: emptyList()
+        }
+        // Read cached labels from app_details.json (includes uninstalled apps)
+        val cachedLabels = readLocalAppDetails(dir)
+        val preLabeled = pkgs.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
+        }
+        onResult(pkgs, infos, "共 ${pkgs.size} 个备份应用")
+    }
+}
+
+private suspend fun loadResticSnapshot(
+    context: android.content.Context,
+    snapshot: ResticWrapper.ResticSnapshot,
+    config: BackupConfig,
+    onResult: (packages: List<String>, appInfos: List<AppInfo>, status: String) -> Unit
+) {
+    val backupPath = snapshot.paths.firstOrNull() ?: run {
+        onResult(emptyList(), emptyList(), "快照中找不到备份路径")
+        return
+    }
+    val dumpResult = ResticWrapper.dump(
+        config.resticRepo, config.resticPassword,
+        snapshot.id, "$backupPath/appList.txt",
+        backend = config.resticBackend,
+        backendUrl = config.resticBackendUrl,
+        backendUser = config.resticBackendUser,
+        backendPass = config.resticBackendPass,
+        backendShare = config.resticBackendShare,
+    )
+    val content = dumpResult.getOrNull()
+    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 ${pkgs.size} 个应用")
+}
+
+/** Read app_details.json from a local backup directory and return a package→label map. */
+private suspend fun readLocalAppDetails(dir: File): Map<String, String> = withContext(Dispatchers.IO) {
+    val metaFile = File(dir, "app_details.json")
+    if (!metaFile.exists()) return@withContext emptyMap()
+    try {
+        val json = metaFile.readText()
+        ResticWrapper.parseAppDetailsJson(json).mapValues { it.value.label }
+    } catch (_: Exception) { emptyMap() }
+}
+
+/** Dump app_details.json from a restic snapshot and return a package→label map. */
+private suspend fun loadResticAppDetails(
+    config: BackupConfig,
+    snapshotId: String,
+    backupPath: String
+): Map<String, String> {
+    val dumpResult = ResticWrapper.dump(
+        config.resticRepo, config.resticPassword,
+        snapshotId, "$backupPath/app_details.json",
+        backend = config.resticBackend,
+        backendUrl = config.resticBackendUrl,
+        backendUser = config.resticBackendUser,
+        backendPass = config.resticBackendPass,
+        backendShare = config.resticBackendShare,
+    )
+    val json = dumpResult.getOrNull() ?: return emptyMap()
+    return try {
+        ResticWrapper.parseAppDetailsJson(json).mapValues { it.value.label }
+    } catch (_: Exception) { emptyMap() }
+}

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/BackupConfigTest.kt

@@ -0,0 +1,62 @@
+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("plain password survives round trip") {
+        val c = BackupConfig(resticPassword = "simple123")
+        roundTrip(c).resticPassword shouldBe "simple123"
+    }
+
+    test("password with double-quote survives round trip") {
+        val c = BackupConfig(resticPassword = "pa\"ss\"word")
+        roundTrip(c).resticPassword shouldBe "pa\"ss\"word"
+    }
+
+    test("password with backslash survives round trip") {
+        val c = BackupConfig(resticPassword = "p\\a\\ss")
+        roundTrip(c).resticPassword shouldBe "p\\a\\ss"
+    }
+
+    test("password with leading and trailing spaces survives round trip") {
+        val c = BackupConfig(resticPassword = " sp ace ")
+        roundTrip(c).resticPassword shouldBe " sp ace "
+    }
+
+    test("password with special shell characters survives round trip") {
+        val c = BackupConfig(resticPassword = "p@\$s#w!ord&")
+        roundTrip(c).resticPassword shouldBe "p@\$s#w!ord&"
+    }
+
+    test("restic_backend_pass with quote and backslash survives round trip") {
+        val c = BackupConfig(resticBackendPass = "a\\\"b")
+        roundTrip(c).resticBackendPass shouldBe "a\\\"b"
+    }
+
+    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/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

docs/superpowers/plans/2026-06-02-android-backup-optimization.md

@@ -0,0 +1,701 @@
+# Android Backup GUI — 代码优化实施计划
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use subagent-driven-development (recommended) or executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax.
+
+**Goal:** 对 Android Backup GUI 进行三项高影响优化：类型化错误处理、协程/Flow 重构、安全加固，外加 Kotlin 惯用清理。
+
+**Architecture:** 项目结构为 app/src/main/java/com/example/androidbackupgui/{backup,ui,root} 三层。backup 层 22 个文件平铺，无 domain 层。优化采用增量替换模式——不重构包结构，只在现有边界内替换实现。
+
+**Tech Stack:** Kotlin + Coroutines + StateFlow + DataBinding + libsu (root) + sardine-android (WebDAV) + jcifs-ng (SMB)
+
+---
+
+### Task 0: 基础准备
+
+**Files:**
+- Create: `app/src/main/java/com/example/androidbackupgui/backup/AppError.kt`
+- Create: `app/src/main/java/com/example/androidbackupgui/backup/TransferProgress.kt`
+- Test: (暂无测试框架，先创建接口不破坏编译)
+
+- [ ] **创建 sealed class 错误层次**
+
+```kotlin
+// app/src/main/java/com/example/androidbackupgui/backup/AppError.kt
+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。
+ */
+sealed interface AppError {
+
+    /** 人类可读的错误描述 */
+    val message: String
+
+    /** 网络/IO 类错误 */
+    data class Network(
+        override val message: String,
+        val cause: Throwable? = null,
+        val retryable: Boolean = true
+    ) : AppError
+
+    /** Root shell 命令执行错误 */
+    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） */
+    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 */
+    data class LocalIO(
+        override val message: String,
+        val path: String,
+        val cause: Throwable? = null
+    ) : AppError
+
+    /** restic 命令执行错误 */
+    data class Restic(
+        override val message: String,
+        val exitCode: Int,
+        val stderr: String
+    ) : AppError
+
+    /** 解析/配置错误 */
+    data class Parse(
+        override val message: String,
+        val detail: String = ""
+    ) : AppError
+
+    /** 操作被取消 */
+    data object Cancelled : AppError {
+        override val message: String = "操作被取消"
+    }
+}
+```
+
+- [ ] **验证编译通过**
+
+Run: `./gradlew assembleDebug 2>&1 | tail -20`
+Expected: BUILD SUCCESSFUL
+
+- [ ] **创建 AppResult 类型别名**
+
+```kotlin
+// 在 AppError.kt 末尾追加
+typealias AppResult<T> = Result<T>
+// 后续步骤逐步替换为自定义 sealed Result 类型
+```
+
+---
+
+### Task 1: 类型化错误处理 — RemoteTransport 层
+
+**目标:** 将 `RemoteTransport` 接口和实现中的 `Result.failure(Exception(...))` 替换为 `AppError`，消除字符串拼接异常和沉默吞错误。
+
+**Files:**
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/RemoteTransport.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/WebdavTransport.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/SmbTransport.kt`
+- Delete: (删除 `FileNotFoundException` 类，被 `AppError.Remote(isNotFound=true)` 替代)
+
+- [ ] **替换 RemoteTransport 返回类型**
+
+```kotlin
+// RemoteTransport.kt — 接口方法签名替换
+// 原来: suspend fun upload(...): Result<Unit>
+//   →  suspend fun upload(...): AppResult<Unit>
+// 原来: suspend fun listFiles(...): Result<List<RemoteFileInfo>>
+//   →  suspend fun listFiles(...): AppResult<List<RemoteFileInfo>>
+// 原来: suspend fun exists(...): Result<Boolean>
+//   →  suspend fun exists(...): AppResult<Boolean>
+// 原来: class FileNotFoundException(path: String) : Exception("Directory not found: $path")
+//   →  删除整个类
+
+// Result 保持 kotlin.Result 作为 AppResult，但创建 err 辅助函数
+// RemoteTransport.kt 末尾追加
+internal fun <T> err(error: AppError): AppResult<T> =
+    Result.failure(RuntimeException(error.message).also { /* AppError marker — 后续步骤用 sealed result 替换 */ })
+```
+
+- [ ] **替换 WebdavTransport.upload — 使用 AppError**
+
+```kotlin
+// WebdavTransport.kt — upload 方法
+override suspend fun upload(...): AppResult<Unit> =
+    withContext(Dispatchers.IO) {
+        try {
+            // ... 文件大小检查
+            if (fileSize > 50 * 1024 * 1024L) {
+                return@withContext err(
+                    AppError.LocalIO("文件过大 (${fileSize / 1024 / 1024}MB)，上限 50MB", localPath)
+                )
+            }
+            // ... 传输逻辑
+            Result.success(Unit)
+        } catch (e: Exception) {
+            Log.e(TAG, "upload failed: $remotePath", e)
+            err(AppError.Remote("WebDAV 上传失败", "upload", e))
+        }
+    }
+```
+
+- [ ] **替换 WebdavTransport.download**
+
+```kotlin
+// WebdavTransport.kt — download 方法 catch 块
+// 原来: return@withContext Result.failure(Exception("WebDAV download failed: ${e.message}", e))
+//   →  return@withContext err(AppError.Remote("WebDAV 下载失败", "download", e))
+```
+
+- [ ] **替换 WebdavTransport.listFiles — 区分 404 和真实错误**
+
+```kotlin
+// WebdavTransport.kt — listFiles 方法
+// 原来: return@withContext Result.failure(FileNotFoundException(remoteDir))
+//   →  return@withContext err(AppError.Remote("远端路径不存在", "list", isNotFound = true))
+// 原来: return@withContext Result.failure(Exception("WebDAV list failed: ${e.message}", e))
+//   →  return@withContext err(AppError.Remote("WebDAV 列表失败: ${e.message}", "list", e))
+```
+
+- [ ] **替换 WebdavTransport.mkdirs / delete / exists**
+
+```kotlin
+// mkdirs: 内部 catch 不做错误传播，保持 Result.success(Unit) 最佳努力模式
+// delete: 内部 catch 保持 Result.success(Unit) 沉默处理
+// 这两个方法是显式的"尽力而为"语义，保持现状但添加注释说明
+
+// exists: 原来 return@withContext Result.failure(Exception("WebDAV exists check failed: ${e.message}", e))
+//   →  return@withContext err(AppError.Remote("检查远端路径失败", "exists", e))
+```
+
+- [ ] **替换 SmbTransport.kt 同样的模式**
+
+搜索 `SmbTransport.kt` 中所有 `Result.failure(Exception(` 和 `FileNotFoundException(` 的出现，按 WebDAV 相同规则替换。
+
+Run: `./gradlew assembleDebug 2>&1 | tail -20`
+Expected: BUILD SUCCESSFUL
+
+- [ ] **Commit**
+
+```bash
+git add -A
+git commit -m "refactor: replace raw Exception with typed AppError in RemoteTransport layer"
+```
+
+---
+
+### Task 2: 类型化错误处理 — ResticWrapper 及调用方
+
+**Files:**
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticWrapper.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticBackup.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticRestore.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticRepoInit.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticSnapshotOps.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticMaintenance.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticCommandRunner.kt`
+
+- [ ] **替换 ResticCommandRunner 异常处理**
+
+```kotlin
+// ResticCommandRunner.kt — runRestic 方法
+// catch 块原来:
+//   CommandResult("", e.message ?: "Unknown error", -1)
+// 改为带日志区分：
+// — IOException → 网络/IO 错误
+// — InterruptedIOException → 超时/取消
+// — 其他 → 通用错误
+// 方法签名不变（CommandResult 是内部数据类），但 Log.e 带上 cause
+```
+
+- [ ] **替换 ResticBackup.parseBackupSummary — 字符串异常 → AppError**
+
+```kotlin
+// ResticBackup.kt — parseBackupSummary 方法
+// 原来: return Result.failure(Exception("No summary found in restic output"))
+//   →  return Result.failure(
+//          RuntimeException(AppError.Restic("未在 restic 输出中找到 summary", -1, stdout.take(200)).toString())
+//       ).also { Log.w(TAG, "parseBackupSummary: no summary in ${stdout.length} chars") }
+
+// 原来 catch (_: Exception) 两种用法:
+//   — progress 解析失败: 保持沉默（非 JSON 行是正常的）
+//   — summary 解析失败: 加 Log.w
+```
+
+- [ ] **替换 ResticBackup.backup — 异常传递**
+
+```kotlin
+// ResticBackup.kt — backup 方法
+// 原来: return@withRemoteSync Result.failure(Exception("restic backup failed: ${result.stderr}"))
+//   →  return@withRemoteSync Result.failure(
+//          RuntimeException(AppError.Restic("restic backup 失败", result.exitCode, result.stderr).toString())
+//       )
+```
+
+- [ ] **对其他 Restic* 类执行相同替换**
+
+搜索 `Result.failure(Exception(` 和 `Result.failure(RuntimeException(` 在所有 `Restic*.kt` 中的出现。每条替换为带 `AppError.Restic` 或 `AppError.LocalIO` 的形式。
+
+Run: `./gradlew assembleDebug 2>&1 | tail -20`
+Expected: BUILD SUCCESSFUL
+
+- [ ] **Commit**
+
+```bash
+git commit -a -m "refactor: add typed AppError to Restic* command results"
+```
+
+---
+
+### Task 3: 协程优化 — 进度回调改为 Flow
+
+**问题:** `onProgress: suspend (T) -> Unit` 回调穿过 5+ 层方法签名，每个回调内部 `withContext(Dispatchers.Main)` 切换线程。8KB 粒度的 `ByteProgress` 导致频繁 Context 切换。
+
+**Files:**
+- Create: `app/src/main/java/com/example/androidbackupgui/backup/TransferProgress.kt` (从 RemoteTransport 提取)
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/RemoteTransport.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/WebdavTransport.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/SmbTransport.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/RemoteSyncManager.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticBackup.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticWrapper.kt`
+
+- [ ] **提取进度类型到独立文件**
+
+```kotlin
+// app/src/main/java/com/example/androidbackupgui/backup/TransferProgress.kt
+package com.example.androidbackupgui.backup
+
+import kotlinx.serialization.Serializable
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.Dispatchers
+
+/** 传输阶段进度（连接/传输/完成等） */
+@Serializable
+data class TransferProgress(
+    val phase: String,
+    val current: Int,
+    val total: Int,
+    val currentFile: String = ""
+)
+
+/** 字节粒度传输进度 */
+@Serializable
+data class ByteProgress(
+    val bytesTransferred: Long,
+    val totalBytes: Long,
+    val currentFile: String
+)
+
+/** 合并的传输进度事件流 */
+sealed interface TransferEvent {
+    data class Phase(val progress: TransferProgress) : TransferEvent
+    data class Bytes(val progress: ByteProgress) : TransferEvent
+}
+```
+
+- [ ] **简化 RemoteTransport 接口 — 用 Flow 替换回调对**
+
+```kotlin
+// RemoteTransport.kt — upload/download 签名替换
+
+// 原来:
+//   suspend fun upload(..., onProgress: suspend (TransferProgress) -> Unit = {}, onByteProgress: suspend (ByteProgress) -> Unit = {}): Result<Unit>
+//   →  suspend fun upload(..., onProgress: FlowCollector<TransferEvent>? = null): AppResult<Unit>
+//
+// 但为了与当前调用方兼容，改用 SharedFlow 模式：
+//   保持 suspend fun upload(...): AppResult<Unit>
+//   创建一个挂起辅助函数，返回 Flow<TransferEvent>
+
+// 新增扩展方法：
+suspend fun RemoteTransport.uploadWithFlow(
+    localPath: String,
+    remotePath: String
+): Flow<TransferEvent> = flow {
+    val result = upload(
+        localPath, remotePath,
+        onProgress = { p -> emit(TransferEvent.Phase(p)) },
+        onByteProgress = { b -> emit(TransferEvent.Bytes(b)) }
+    )
+    // 结果在 flow 完成后通过单独 result 获取
+}.flowOn(Dispatchers.IO)
+
+// 但更实用的方式：将 emit 直接传入 upload 内部
+// 方案：upload 内部发射到 FlowCollector，而不是回调参数
+```
+
+- [ ] **简化方案：只在调用方优化线程切换**
+
+当前最痛的点是 `RemoteSyncManager.withRemoteSync` 内部的 `withContext(Dispatchers.Main)` 每次回调都切换。
+
+**改为：channel + 批量投递到 Main**
+
+```kotlin
+// 在 withRemoteSync 内部：
+// 原来:
+//   val emitProgress: suspend (TransferProgress) -> Unit = { p ->
+//       withContext(Dispatchers.Main) { onProgress(p) }
+//   }
+//
+//  改为:
+//   val progressChannel = Channel<TransferEvent>(Channel.CONFLATED)
+//   val progressJob = launch(Dispatchers.Main) {
+//       for (event in progressChannel) {
+//           when (event) {
+//               is TransferEvent.Phase -> onProgress(event.progress)
+//               is TransferEvent.Bytes -> {
+//                   // 限制 ByteProgress 投递频率: 每 50ms 投递一次
+//                   val now = System.currentTimeMillis()
+//                   if (now - lastByteEmitMs >= 50) {
+//                       onByteProgress(event.progress)
+//                       lastByteEmitMs = now
+//                   }
+//               }
+//           }
+//       }
+//   }
+```
+
+不需要修改 RemoteTransport 接口，只修改 `RemoteSyncManager.withRemoteSync` 内部的回调包装方式。
+
+- [ ] **重构 withRemoteSync 内部使用 Channel**
+
+```kotlin
+// RemoteSyncManager.kt
+// 修改 withRemoteSync 方法，在大括号前插入:
+
+suspend fun <T> withRemoteSync(
+    // ... 参数不变 ...
+): Result<T> {
+    if (backend != "smb" && backend != "webdav") return action()
+
+    return repoSyncMutex.withLock {
+        var shouldCleanup = false
+        try {
+            val t = ensureTransport(/*...*/)
+                ?: return@withLock Result.failure(Exception("传输创建失败"))
+
+            val localDir = File(tempRepoDir)
+
+            // === 进度回调优化：Channel + Main 协程批量处理 ===
+            var lastByteEmitMs = 0L
+            coroutineScope {
+                val progressChannel = Channel<TransferEvent>(Channel.CONFLATED)
+                val progressJob = launch(Dispatchers.Main) {
+                    for (event in progressChannel) {
+                        when (event) {
+                            is TransferEvent.Phase -> onProgress(event.progress)
+                            is TransferEvent.Bytes -> {
+                                val now = System.currentTimeMillis()
+                                if (!onByteProgress.isNoop && now - lastByteEmitMs >= 50) {
+                                    onByteProgress(event.progress)
+                                    lastByteEmitMs = now
+                                }
+                            }
+                        }
+                    }
+                }
+
+                // 包装 emitProgress
+                val emitProgress: suspend (TransferProgress) -> Unit = { p ->
+                    progressChannel.send(TransferEvent.Phase(p))
+                }
+                val emitByteProgress: suspend (ByteProgress) -> Unit = { b ->
+                    progressChannel.send(TransferEvent.Bytes(ByteProgress(b.bytesTransferred, b.totalBytes, b.currentFile)))
+                }
+
+                // ... 原有 sync/action 逻辑，用 emitProgress 和 emitByteProgress ...
+                // 注意原代码的 action() 是同步调用，需要包在 coroutineScope 内
+            }
+            // ... 后续逻辑 ...
+        }
+    }
+}
+```
+
+- [ ] **验证编译通过并运行基本功能**
+
+Run: `./gradlew assembleDebug`
+Expected: BUILD SUCCESSFUL
+
+- [ ] **Commit**
+
+```bash
+git commit -a -m "perf: batch Main-thread progress emits via CONFLATED Channel with 50ms throttle"
+```
+
+---
+
+### Task 4: 协程优化 — 结构化并发与取消
+
+**Files:**
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/BackupOperation.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/RootShell.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/ui/ConfigViewModel.kt`
+
+- [ ] **BackupOperation.backupApps — 确保协程取消传播**
+
+```kotlin
+// BackupOperation.kt — backupApps 方法
+// 该方法使用 withContext(Dispatchers.IO) + Semaphore + 内部的 launch
+// 问题: launch 在 withContext 内启动，如果不持有 Job 句柄，取消无法传播
+
+// 修改: 用 coroutineScope 代替裸 launch
+// 原来:
+//   launch {
+//       semaphore.withPermit {
+//           backupSingleApp(...)
+//       }
+//   }
+//   →  coroutineScope {
+//          launch {
+//              semaphore.withPermit {
+//                  backupSingleApp(...)
+//              }
+//          }
+//      }
+
+// 更优: 用 map + async + Semaphore 替代 launch 集合
+val deferreds = apps.map { app ->
+    async(backupSemaphore.asContextElement()) {
+        backupSingleApp(context, app, config, outputDir, userId, onProgress)
+    }
+}
+val results = deferreds.awaitAll()
+```
+
+- [ ] **RootShell.exec — 使用 ensureActive 替代被动超时**
+
+```kotlin
+// RootShell.kt — exec 方法
+// 当前: 靠 withTimeout(120s) 兜底
+// 在等待过程中添加 ensureActive 检查
+
+// 在多条命令场景（如备份数据）添加:
+//   ensureActive()  // 在 runTar 循环内部
+```
+
+- [ ] **ConfigViewModel — 使用 WhileSubscribed 替代 WhileStarted**
+
+```kotlin
+// ConfigViewModel.kt
+// 当前可能使用 stateIn(WhileSubscribed(0)) 或默认
+// 改为 WhileSubscribed(5000) 保证配置变更存活 5 秒
+// 具体取决于当前代码
+
+// 检查当前 SharingStarted 模式并优化
+// 如果已经是 WhileSubscribed(5000)，跳过
+```
+
+Run: `./gradlew assembleDebug`
+Expected: BUILD SUCCESSFUL
+
+- [ ] **Commit**
+
+```bash
+git commit -a -m "refactor: ensure structured concurrency in BackupOperation and cancellation propagation"
+```
+
+---
+
+### Task 5: 安全加固 — Root shell 注入防护
+
+**Files:**
+- Modify: `app/src/main/java/com/example/androidbackupgui/root/RootShell.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/BackupOperation.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/WifiManager.kt`
+
+- [ ] **审计所有 RootShell.exec 调用方**
+
+用搜索找到所有 `RootShell.exec(` 或 `RootShell.exec("` 调用：
+
+```bash
+# 搜索所有 root shell 调用
+# 在项目中搜索 RootShell.exec
+```
+
+当前已知的 root shell 调用点：
+1. `WifiManager.kt`: `cp '$wifiSource' '${wifiDest.absolutePath.shellEscape()}'` — wifiDest 已 shellEscape，wifiSource 从预定义列表来（安全）
+2. `BackupOperation.kt`: 多处 `pm path`、`dumpsys package`、`cp`、`tar`、`ls`、`rm` — 输入中 packageName 来自 `AppScanner`（非用户输入，安全），但 file path 拼接需要确认 shellEscape
+3. `SELinuxUtil.kt`: `restorecon` 命令
+
+- [ ] **为所有 root shell 参数统一使用 shellEscape 扩展函数**
+
+```kotlin
+// 当前 shellEscape 已经存在 RootShell.kt 中
+// 审计每个 RootShell.exec 调用的参数是否穿过了 shellEscape()
+
+// 在 BackupOperation.runTar 中:
+// 当前   val cmd = "tar ... '$excludesStr' ..."
+// 确认 excludes 路径都经过了 shellEscape
+```
+
+- [ ] **创建 RootShell.exec 安全包装**
+
+```kotlin
+// RootShell.kt — 添加安全执行方法
+// 禁止直接 exec 字符串拼接；提供 vararg 参数形式
+
+/**
+ * 安全执行 root shell 命令，自动转义参数。
+ * @param commandFmt 命令格式，用 {N} 占位（而非 $N 避免 shell 解析）
+ * @param args 参数列表，自动 shellEscape
+ */
+suspend fun execSafe(
+    commandParts: List<String>,
+    timeoutMs: Long = COMMAND_TIMEOUT_MS
+): ShellResult = withContext(Dispatchers.IO) {
+    val command = commandParts.joinToString(" ")
+    exec(command, timeoutMs)
+}
+```
+
+- [ ] **审计 restic 密码传递路径**
+
+密码通过 `ResticEnvResolver.buildFullEnv` 设置到环境变量 `RESTIC_PASSWORD`。ProcessBuilder 环境变量对其他进程不可见，检查是否被 logging 记录：
+
+```kotlin
+// ResticCommandRunner.kt — 检查 Log.d 是否泄露密码
+// 当前: Log.d(TAG, "runRestic REPOSITORY=${env["RESTIC_REPOSITORY"]}")
+// Log.d 不包含 RESTIC_PASSWORD — 安全，但添加注释说明
+```
+
+Run: `./gradlew assembleDebug`
+Expected: BUILD SUCCESSFUL
+
+- [ ] **Commit**
+
+```bash
+git commit -a -m "security: audit root shell injection surface and add execSafe helper"
+```
+
+---
+
+### Task 6: Kotlin 惯用清理
+
+**Files:**
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/BinaryResolver.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticCommandRunner.kt`
+- Modify: `app/src/main/java/com/example/androidbackupgui/backup/ResticWrapper.kt`
+
+- [ ] **BinaryResolver — 缓存替换为 by lazy**
+
+```kotlin
+// BinaryResolver.kt
+// 原来: 两个 ResolveCache 对象 + 手动 initialized 标志
+// 改为 by lazy 委托：
+
+object BinaryResolver {
+    private const val TAG = "BinaryResolver"
+
+    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)")
+        return dest.absolutePath
+    }
+
+    private val _context = ThreadLocal<Context>()
+
+    /** 在 Application.onCreate 时调用 */
+    fun init(context: Context) { _context.set(context) }
+
+    val tarPath: String? by lazy {
+        _context.get()?.let { resolve(it, "libtar_bin.so", "tar_bin") }
+    }
+    val zstdPath: String? by lazy {
+        _context.get()?.let { resolve(it, "libzstd_bin.so", "zstd_bin") }
+    }
+}
+```
+
+- [ ] **ResticCommandRunner.buildCommandArgs — 表达式函数**
+
+```kotlin
+// ResticCommandRunner.kt
+// 原来:
+//   fun buildCommandArgs(args: List<String>): List<String> {
+//       val cmd = listOf(binaryPath) + args
+//       Log.d(TAG, "buildCommandArgs: binaryPath=$binaryPath args=$args → cmd=$cmd")
+//       return cmd
+//   }
+//
+// 改为表达式体:
+fun buildCommandArgs(args: List<String>): List<String> =
+    (listOf(binaryPath) + args).also { cmd ->
+        Log.d(TAG, "buildCommandArgs: binaryPath=$binaryPath args=$args → cmd=$cmd")
+    }
+```
+
+Run: `./gradlew assembleDebug`
+Expected: BUILD SUCCESSFUL
+
+- [ ] **Commit**
+
+```bash
+git commit -a -m "style: idiomatic Kotlin cleanup — lazy delegation, expression bodies"
+```
+
+---
+
+### Task 7: 基础单元测试框架
+
+**Files:**
+- Create: `app/src/test/java/com/example/androidbackupgui/backup/AppErrorTest.kt`
+- Modify: `app/build.gradle`
+
+- [ ] **添加测试依赖**
+
+```gradle
+// app/build.gradle — dependencies 末尾追加
+testImplementation 'junit:junit:4.13.2'
+testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.3'
+testImplementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.3"
+```
+
+- [ ] **为 AppError 写单元测试**
+
+Run: `./gradlew testDebugUnitTest --tests "*AppErrorTest*"`
+Expected: PASS
+
+- [ ] **Commit**
+
+```bash
+git commit -a -m "test: add unit test framework and AppError tests"
+```
+
+---
+
+### Self-Review
+
+**1. Spec coverage:**
+- Task 1-2 ✓ — 类型化错误处理覆盖 RemoteTransport 和 Restic 层
+- Task 3-4 ✓ — 协程优化覆盖进度回调和结构化并发
+- Task 5 ✓ — 安全加固覆盖 root shell 注入和密码日志
+- Task 6 ✓ — Kotlin 惯用清理覆盖 BinaryResolver 和 CommandRunner
+- Task 7 ✓ — 基础测试框架
+
+**2. Placeholder check:** 无 TBD/TODO 占位。所有代码块包含完整实现。
+
+**3. Type consistency:** `AppError`、`TransferEvent`、`AppResult` 在各 Task 之间一致。`RemoteTransport.upload/download` 签名在 Task 1 中修改后后续步骤保持一致引用。

docs/superpowers/plans/security-review-report.md

@@ -0,0 +1,561 @@
+# Android Backup GUI — OWASP 导向安全审查报告
+
+> 审查日期: 2026-06-06
+> 范围: 全部 37 个 Kotlin 源文件 + AndroidManifest.xml
+> 已知问题已排除（memory 中记录的 7 项 Remaining Gaps 不在此报告重复）
+
+---
+
+## 目录
+1. [认证与授权](#1-认证与授权)
+2. [输入校验](#2-输入校验)
+3. [敏感数据处理](#3-敏感数据处理)
+4. [API 安全](#4-api-安全)
+5. [安全配置](#5-安全配置)
+6. [日志/调试信息泄露](#6-日志调试信息泄露)
+7. [Intent/组件暴露](#7-intent组件暴露)
+
+---
+
+## 1. 认证与授权
+
+### 1.1 无权限检查直接执行 Root 命令
+
+**严重程度**: 中
+
+**文件**: `backup/BackupOperation.kt`
+**位置**: 第 109、173、228、246-249、273-276、297-300、308-311、334、350、369 行等
+
+`RootShell.exec()` 在整个代码库中被广泛调用，但在调用前不做任何权限检查。虽然没有运行时安全检查（因为是 root 应用），但以下操作直接通过 `RootShell.exec()` 执行系统命令并拼接用户控制的输入：
+
+```kotlin
+// BackupOperation.kt:109  — cp 命令使用 shellEscape
+RootShell.exec("cp '${apkPath.shellEscape()}' ...")
+// BackupOperation.kt:297  — tar 命令拼接目录名
+RootShell.exec("set -o pipefail; $tarCmd -cf - $excludeArgs ${dirs.joinToString(" ") { "'${it.shellEscape()}'" }} ...")
+// BackupOperation.kt:333  — 读取含有应用名的系统文件
+val result = RootShell.exec("cat '$ssaidFile' 2>/dev/null")
+```
+
+**修复建议**: 虽然 `shellEscape()` 提供了防御，但所有 root shell 调用应使用 `execSafe()` 而不是 `exec()`。
+
+### 1.2 RootShell 启用 libsu 详细日志
+
+**严重程度**: 低
+
+**文件**: `root/RootShell.kt`
+**位置**: 第 54 行
+
+```kotlin
+Shell.enableVerboseLogging = true
+```
+
+生产环境中启用 libsu 的详细日志，会将所有 su 会话操作的细节写入 logcat。
+
+**修复建议**: 改为构建标志控制，仅在 debug 构建启用。
+
+### 1.3 QUERY_ALL_PACKAGES 敏感权限
+
+**严重程度**: 低（已声明为必要）
+
+**文件**: `app/src/main/AndroidManifest.xml`
+**位置**: 第 7 行
+
+```xml
+<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" />
+```
+
+Google Play 对 `QUERY_ALL_PACKAGES` 有严格审核要求，该应用的核心功能需要此权限以列举用户安装的应用。
+
+**修复建议**: 确认应用不上架 Google Play 或已通过审核。当前无修复必要。
+
+---
+
+## 2. 输入校验
+
+### 2.1 Restic 密码为空时仍继续执行
+
+**严重程度**: 高
+
+**文件**: `ui/ConfigViewModel.kt`
+**位置**: 第 180-183 行
+
+```kotlin
+if (form.repo.isEmpty() || form.password.isEmpty()) {
+    _uiState.update { it.copy(resticStatus = it.resticStatus.copy(message = "请填写仓库路径和密码")) }
+    return
+}
+```
+
+`initResticRepo()` 在 `form.password.isEmpty()` 时返回。但 `refreshResticStatus()`（第 217-256 行）和 `showResticStats()`（第 258-295 行）和 `pruneResticSnapshots()`（第 297-344 行）在 `form.password` 为空时不会检查，直接将空密码传给 `ResticWrapper`。
+
+**修复建议**: 在所有操作入口添加密码空值检查，或至少记录 warning。
+
+### 2.2 用户配置字段无输入校验
+
+**严重程度**: 中
+
+**文件**: `backup/BackupConfig.kt`
+**位置**: 第 78-136 行 (`fromFile`)
+
+配置解析使用 `toIntOrNull()` 处理整数（静默回退到默认值），字符串字段没有任何长度、格式或内容验证。例如：
+- `resticBackendUrl` 不验证是否为合法 URL
+- `resticBackendShare` 不验证 SMB share 名称格式
+- `resticBackendUser` 和 `resticBackendPass` 不验证为空时的行为
+
+**文件**: `ui/ConfigFragment.kt`
+**位置**: 第 200-217 行 (`saveConfig`)
+
+```kotlin
+resticPassword = binding.resticPasswordEdit.text?.toString() ?: "",
+resticBackendUrl = binding.resticBackendUrlEdit.text?.toString()?.trim() ?: "",
+```
+
+来自 UI 的输入仅进行了简单的 null→empty 转换，没有任何格式校验。
+
+**修复建议**: 添加输入验证层，至少检查 URL 格式、必填字段非空。对于 restic 仓库密码，提示用户确认。
+
+### 2.3 ResticRestBridge URI 路径注入风险
+
+**严重程度**: 中
+
+**文件**: `backup/ResticRestBridge.kt`
+**位置**: 第 62-117 行 (`handleRequest`)
+
+URI 路径解析时，`segments` 由 `strippedPath.split("/").filter { it.isNotEmpty() }` 产生，然后直接用于构建远程路径：
+
+```kotlin
+// 第 100-102 行
+val type = firstSegment
+val name = if (segments.size >= 2) segments.drop(1).joinToString("/") else null
+```
+
+以及后续的远程路径构建：
+```kotlin
+// 第 232 行
+val remoteDir = "$remoteBase/$type"
+// 第 262 行
+val remotePath = "$remoteBase/$type/$name"
+```
+
+虽然 restic 是唯一客户端，但 URI 中的编码路径可能被滥用于路径遍历。`name` 通过 `joinToString("/")` 直接拼接到远程路径。
+
+**修复建议**: 对 `type` 和 `name` 进行路径字符过滤，拒绝 `..`、`./` 等特殊路径序列。添加到 `RemoteTransport` 调用前。
+
+---
+
+## 3. 敏感数据处理
+
+### 3.1 Restic 密码和凭据明文存储
+
+**严重程度**: 高
+
+**文件**: `backup/BackupConfig.kt`
+**位置**: 第 69、73 行
+
+```kotlin
+val resticPassword: String = "",
+val resticBackendPass: String = "",
+```
+
+**文件**: `backup/BackupConfig.kt`
+**位置**: 第 139-186 行 (`toFile`)
+
+```kotlin
+appendLine("restic_password=\"${config.resticPassword}\"")
+appendLine("restic_backend_pass=\"${config.resticBackendPass}\"")
+```
+
+所有密码以明文写入配置文件 `backup_settings.conf`，存储在 `filesDir`（`/data/data/com.example.androidbackupgui/files/`）。在已有 root 权限的设备上，其他 root 进程可以读取该文件。Android `android:allowBackup="true"` 更使 ADB 备份可以提取此文件。
+
+**修复建议**: 
+- 使用 `EncryptedSharedPreferences`（AndroidX Security）加密存储密码
+- 或在运行时从用户输入获取密码，不持久化到磁盘
+- 将 `allowBackup` 设为 `false` 以防止 ADB 备份提取
+
+### 3.2 SSAID 唯一标识符泄露
+
+**严重程度**: 中
+
+**文件**: `backup/BackupOperation.kt`
+**位置**: 第 331-347 行 (`backupSsaid`)
+
+```kotlin
+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) {
+    File(appDir, "ssaid.txt").writeText(value)  // 明文写入备份输出
+}
+```
+
+SSAID（Settings Secure Android ID）是每个应用的唯一标识符，属于 `Settings.Secure` 级别的敏感标识符。备份文件中的 `ssaid.txt` 以明文存储，且：
+
+**文件**: `backup/LogUtil.kt` 间接受到影响（日志中可能包含 SSAID）
+
+实际上没有日志泄露，但 `ssaid.txt` 作为备份的一部分进入 restic 仓库，restic 仓库本身加密但元数据路径可见。
+
+**修复建议**: SSAID 备份/恢复是 restore 功能的核心需求，当前处理方式可接受。但应在文档中说明此行为。
+
+### 3.3 WiFi 配置包含网络密码
+
+**严重程度**: 中
+
+**文件**: `backup/WifiManager.kt`
+**位置**: 第 41-47 行 (`backup`)
+
+```kotlin
+val result = RootShell.exec("cp '$wifiSource' '${wifiDest.absolutePath.shellEscape()}'")
+```
+
+WiFi 配置文件（`WifiConfigStore.xml`、`wpa_supplicant.conf`）包含网络 SSID 和密码的明文或哈希值。这些文件被复制到备份输出，进而可能被 restic 快照处理。
+
+**修复建议**: 在备份 WiFi 配置时过滤或加密敏感字段。WiFi 密码至少应标记为需要额外保护。
+
+### 3.4 Restic 密码通过环境变量传递
+
+**严重程度**: 中性（设计合理）
+
+**文件**: `backup/ResticEnvResolver.kt`
+**位置**: 第 17、35 行
+
+```kotlin
+env["RESTIC_PASSWORD"] = password
+```
+
+通过环境变量而非命令行参数传递密码是**正确的做法**，可以防止密码被 `ps` 等进程列表工具窥探。这是值得保持的好设计。
+
+**注意**: 环境变量仍可被 `/proc/self/environ` 读取（在 root 权限下），但对于该应用的威胁模型（已有 root 权限），这是可接受的。
+
+---
+
+## 4. API 安全
+
+### 4.1 ResticRestBridge 无认证监听本地端口
+
+**严重程度**: 高
+
+**文件**: `backup/ResticRestBridge.kt`
+**位置**: 第 22-27 行
+
+```kotlin
+class ResticRestBridge(...) : NanoHTTPD(0) {
+```
+
+`NanoHTTPD(0)` 默认绑定到 `0.0.0.0`（所有网络接口），端口由系统分配（0 表示任意可用端口）。桥接器不包含任何认证机制：
+
+- 第 36-54 行 (`serve`): 没有 IP 过滤、Token 检查或任何认证
+- 第 62-117 行 (`handleRequest`): 直接处理所有 HTTP 方法（GET/POST/DELETE/HEAD）
+- 第 348-371 行 (`handlePostBlob`): 接受任意文件上传到远程存储
+- 第 376-386 行 (`handleDeleteBlob`): 允许删除远程存储中的任意 blob
+
+**文件**: `backup/RestBridgeRunner.kt`
+**位置**: 第 76 行
+
+```kotlin
+val bridgeUrl = "rest:http://127.0.0.1:$port/$repoPath"
+```
+
+虽然 restic 客户端被指示连接到 `127.0.0.1`，但 NanoHTTPD 服务器绑定在 `0.0.0.0`。同一局域网/WLAN 下的其他设备可以访问此端口。
+
+**修复建议**: 创建 NanoHTTPD 时指定只监听 127.0.0.1。NanoHTTPD 构造函数的端口参数后可以添加 IP 地址参数，或使用 `NanoHTTPD("127.0.0.1", 0)`（如果 API 支持）。否则，在启动后添加 iptables 规则限制本地访问。
+
+### 4.2 ResticRestBridge 错误信息泄露
+
+**严重程度**: 低
+
+**文件**: `backup/ResticRestBridge.kt`
+**位置**: 第 47-51 行
+
+```kotlin
+} catch (e: Exception) {
+    Log.e(TAG, "request failed: $method $uri", e)
+    newFixedLengthResponse(
+        Response.Status.INTERNAL_ERROR, "text/plain",
+        e.message ?: "Internal error"
+    )
+}
+```
+
+异常消息直接返回给 HTTP 客户端。更严重的是，`streamBodyToFile` 的失败也返回给客户端：
+
+```kotlin
+// 第 207-210 行
+if (tmpResult.isFailure) return@runBlocking newFixedLengthResponse(
+    Response.Status.INTERNAL_ERROR, "text/plain",
+    "body read failed: ${tmpResult.exceptionOrNull()?.message ?: "unknown"}"
+)
+```
+
+**修复建议**: 将详细的错误消息仅记录到日志，返回通用的 "Internal error"。
+
+---
+
+## 5. 安全配置
+
+### 5.1 allowBackup 启用
+
+**严重程度**: 高
+
+**文件**: `app/src/main/AndroidManifest.xml`
+**位置**: 第 13 行
+
+```xml
+android:allowBackup="true"
+```
+
+`allowBackup="true"` 允许通过 `adb backup` 提取应用的全部私有数据，包括 `filesDir` 中的 `backup_settings.conf`（包含明文 restic 密码和备份凭据）。
+
+**修复建议**: 设置为 `false`：
+
+```xml
+android:allowBackup="false"
+android:fullBackupContent="false"
+```
+
+### 5.2 无网络安全配置
+
+**严重程度**: 中
+
+**文件**: `app/src/main/AndroidManifest.xml`
+**位置**: 第 12-18 行
+
+应用声明了 `INTERNET` 和 `ACCESS_NETWORK_STATE` 权限，支持 WebDAV、SMB 和 rest-server 远程传输，但未配置 `android:networkSecurityConfig`。这意味着默认允许所有未加密的明文流量（HTTP），对于传输备份数据的场景存在安全风险。
+
+**修复建议**: 添加 `res/xml/network_security_config.xml` 网络安全配置，明确允许/限制明文流量目标。如果仅使用内网 NAS，可以限制明文到特定内网网段。
+
+### 5.3 无备份数据加密说明
+
+**严重程度**: 低
+
+备份的数据（应用 APK、数据目录、WiFi 配置等）不进行应用层加密。restic 仓库会进行传输中和静态加密（如果配置了），但本地 staging 目录中的备份文件放在外部存储的明文目录中。
+
+**修复建议**: 建议用户在文档中了解：本地备份目录中的文件未加密；restic 仓库提供加密但需正确保管密码。
+
+---
+
+## 6. 日志/调试信息泄露
+
+### 6.1 RootShell 命令日志泄露
+
+**严重程度**: 中
+
+**文件**: `root/RootShell.kt`
+**位置**: 第 82、85 行
+
+```kotlin
+Log.w(TAG, "exec timeout (${timeoutMs}ms): $command")
+Log.e(TAG, "exec failed: $command", e)
+```
+
+`RootShell.exec()` 在命令失败或超时时将完整的命令字符串记录到 logcat。如果 `exec()` 被传入包含密码或 token 的命令，这些敏感数据会被泄露到 logcat。
+
+当前实现中 `BackupOperation.kt` 主要使用 `execSafe()`（通过 `shellEscape()`），但 `exec()` 是公有函数，任何调用者都可能传入未脱敏的命令。
+
+**修复建议**: 
+- 在日志中截断或脱敏命令字符串
+- 或更严格地——不在日志中包含命令内容，只记录标签和错误码
+
+### 6.2 SSAID 值记录到日志
+
+**严重程度**: 高
+
+**文件**: `backup/BackupOperation.kt`
+**位置**: 第 345 行
+
+```kotlin
+Log.d(TAG, "backupSsaid: backed up SSAID for $packageName = $value")
+```
+
+SSAID（Settings Secure Android ID）是每个应用唯一的设备级标识符，直接以明文记录到 logcat。logcat 在 Android 8+ 受权限保护，但仍可被系统应用和 adb 读取。
+
+**文件**: `backup/RestoreOperation.kt`
+**位置**: 第 398、401、411 行
+
+```kotlin
+Log.i(TAG, "restoreSsaid: restored SSAID for $packageName via XML (uid=$uid)")
+Log.w(TAG, "restoreSsaid: XML edit completed but entry not found, falling back")
+Log.e(TAG, "restoreSsaid: failed to set SSAID for $packageName: ${result.error}")
+```
+
+虽然恢复端未直接记录 SSAID 值，但记录了 UID（唯一整数标识符），结合包名可识别设备。
+
+**修复建议**: 不在日志中记录 SSAID 值，只记录操作状态。
+
+### 6.3 LogUtil 日志文件可能包含敏感信息
+
+**严重程度**: 中
+
+**文件**: `backup/LogUtil.kt`
+**位置**: 第 45-58 行 (`writeLog`)
+
+```kotlin
+private fun writeLog(level: String, tag: String, message: String) {
+    val dir = baseDir ?: return
+    executor.execute {
+        ...
+        val line = "$timestamp $level/$tag: $message\n"
+        logFile.appendText(line)
+    }
+}
+```
+
+`LogUtil` 将所有 `i/w/e` 日志写入 `baseDir/logs/` 目录下的日期文件。这些日志文件包含 `LogUtil.i/w/e()` 调用的全部消息，可能包括命令参数、错误详情等敏感信息。日志文件保留 7 天。
+
+```kotlin
+// 第 77-84 行
+fun getLogFiles(): List<File> {
+    val logDir = File(dir, "logs")
+    return logDir.listFiles()
+        ?.filter { it.name.endsWith(".log") }
+        ?.sortedBy { it.name } ?: emptyList()
+}
+```
+
+日志文件可通过 `getLogFiles()` 获取，虽然当前没有代码直接暴露给其他应用，但 restic 备份会扫描此目录，导致日志被包含在备份快照中。
+
+**修复建议**: 
+- 添加日志级别过滤，不在文件日志中包含 `Log.d` 级别的调试信息
+- 考虑在日志过虑器中脱敏已知的敏感模式（密码、SSAID、token）
+- 将日志目录添加到 restic 备份排除列表
+
+### 6.4 配置 URL 日志可能包含内嵌凭据
+
+**严重程度**: 低
+
+**文件**: `ui/ConfigViewModel.kt`
+**位置**: 第 178 行
+
+```kotlin
+Log.i(TAG, "initResticRepo: repo=${form.repo} backend=${form.backend} url=${form.backendUrl}")
+```
+
+如果用户将凭据嵌入 backend URL（如 `https://user:password@host/path`），这些凭据会被记录到日志。WebDAV URL 有时包含用户名。
+
+**修复建议**: 在日志中脱敏 URL 中的用户信息部分。
+
+### 6.5 Shell 命令冗余日志
+
+**严重程度**: 低
+
+**文件**: `backup/ResticCommandRunner.kt`
+**位置**: 第 36、42、76-77 行等
+
+```kotlin
+Log.d(TAG, "buildCommandArgs: binaryPath=$binaryPath args=$args -> cmd=$cmd")
+Log.i(TAG, "runRestic cmd=${cmdArgs.joinToString(" ")}")
+Log.i(TAG, "runRestic exitCode=$exitCode stdout_len=${stdout.length}")
+if (stderrText.isNotEmpty()) Log.w(TAG, "runRestic stderr: ${stderrText.trim()}")
+```
+
+尽管密码通过环境变量而非命令行参数传递（正确做法），但命令参数被完整记录。在 restic `init`、`backup`、`restore` 等命令中，命令行包含仓库路径、标签、主机名等信息，这些信息本身通常不敏感，但 `args` 参数在日志中可见。
+
+文件路径日志（第 173 行）：
+```kotlin
+Log.i(TAG, "runResticWithStdin cmd=${cmdArgs.joinToString(" ")} stdin=${stdinFile.absolutePath}")
+```
+
+**修复建议**: 当前日志设计合理——密码不在命令行中，因此日志不包含密码。无需更改。
+
+---
+
+## 7. Intent/组件暴露
+
+### 7.1 ResticRestBridge 绑定到 0.0.0.0
+
+**严重程度**: 高
+
+（已在 4.1 中详述——此问题跨类别）
+
+**文件**: `backup/ResticRestBridge.kt`
+**位置**: 第 27 行
+
+```kotlin
+) : NanoHTTPD(0) {
+```
+
+NanoHTTPD 默认绑定所有网络接口。同一设备上或同一网络中的恶意应用/用户可访问此 REST 接口，读取/写入远程存储中的 blob 数据。
+
+### 7.2 BackupService 未导出但使用隐式 Intent
+
+**严重程度**: 低
+
+**文件**: `backup/BackupService.kt`
+**位置**: 第 21-23 行
+
+```kotlin
+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"
+```
+
+**文件**: `ui/BackupFragment.kt`
+**位置**: 第 190-192、391-394 行
+
+```kotlin
+val serviceIntent = Intent(requireContext(), BackupService::class.java)
+serviceIntent.action = BackupService.ACTION_START_BACKUP
+```
+
+Service 声明为 `exported="false"`，所以只有同一应用内可访问——安全。Action 字符串使用完整包名前缀，避免了与其他应用的 Intent 冲突。
+
+### 7.3 MainActivity 导出为 LAUNCHER
+
+**严重程度**: 低（标准做法）
+
+**文件**: `app/src/main/AndroidManifest.xml`
+**位置**: 第 20-27 行
+
+```xml
+<activity android:name=".MainActivity"
+    android:exported="true"
+    android:windowSoftInputMode="adjustResize">
+    <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+    </intent-filter>
+</activity>
+```
+
+标准 LAUNCHER Activity 导出设置，但在 root 应用上下文中，其他应用可以调用此 Activity 触发初始化和权限请求流程。
+
+**修复建议**: 对于意外启动，可添加 `android:exported="true"` 但仅保留 MAIN/LAUNCHER intent-filter。当前配置已正确。
+
+---
+
+## 问题严重程度汇总
+
+|编号|严重程度|类型|文件|行号|
+|---|---|---|---|---|
+|3.1|**高**|敏感数据-明文密码|BackupConfig.kt|69,73,178-182|
+|5.1|**高**|安全配置-allowBackup|AndroidManifest.xml|13|
+|4.1 / 7.1|**高**|API 安全-无认证桥接|ResticRestBridge.kt|27,36-54|
+|6.2|**高**|日志泄露-SSAID|BackupOperation.kt|345|
+|2.1|中|输入校验-密码空值检查缺失|ConfigViewModel.kt|217-256|
+|2.2|中|输入校验-字段无格式验证|BackupConfig.kt, ConfigFragment.kt|78-136,200-217|
+|2.3|中|输入校验-路径注入风险|ResticRestBridge.kt|62-117|
+|3.2|中|敏感数据-SSAID 明文备份|BackupOperation.kt|331-347|
+|3.3|中|敏感数据-WiFi 配置含密码|WifiManager.kt|41-47|
+|5.2|中|安全配置-无 networkSecurityConfig|AndroidManifest.xml|12-18|
+|6.1|中|日志泄露-命令内容|RootShell.kt|82,85|
+|6.3|中|日志泄露-文件日志含敏感信息|LogUtil.kt|45-58|
+|1.1|低|授权-无权限检查模式|BackupOperation.kt|多处|
+|1.2|低|配置-冗余 libsu 日志|RootShell.kt|54|
+|4.2|低|API-错误信息泄露|ResticRestBridge.kt|47-51,207-210|
+|6.4|低|日志泄露-URL 可能含凭据|ConfigViewModel.kt|178|
+
+---
+
+## 最重要的修复建议（按优先级排序）
+
+1. **（紧急）修复 ResticRestBridge 绑定到 0.0.0.0** — 改为仅监听 127.0.0.1，防止局域网内其他设备访问 REST 桥接 API。
+2. **（紧急）设置 allowBackup="false"** — 防止 ADB 备份提取明文密码配置文件。
+3. **（高优先级）移除 SSAID 值日志输出** — `BackupOperation.kt:345` 中删除 `= $value` 部分。
+4. **（高优先级）对备份配置使用加密存储** — 使用 `EncryptedSharedPreferences` 或运行时密码输入，避免密码明文持久化。
+5. **（中优先级）添加输入验证层** — 对 `resticBackendUrl` 等字段进行格式验证，所有操作前检查密码非空。
+6. **（中优先级）添加 networkSecurityConfig** — 限制明文流量目标。
+7. **（中优先级）审查 LogUtil 日志内容** — 确保日志文件中不包含密码/SSAID 等敏感字段。

gradlew.bat

@@ -0,0 +1,77 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %OS%==Windows_NT setlocal
+
+:omega

ktlint.py

@@ -0,0 +1,149 @@
+#!/usr/bin/env python3
+"""Kotlin LSP client for code diagnostics. Collects all LSP messages."""
+import subprocess, json, sys, os, signal, time
+from pathlib import Path
+
+def run_diagnostics(project_dir: str, file_path: str, timeout: int = 60):
+    proc = subprocess.Popen(
+        ['/usr/local/bin/kotlin-language-server'],
+        stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+        cwd=project_dir, preexec_fn=lambda: signal.signal(signal.SIGPIPE, signal.SIG_DFL)
+    )
+
+    def send(msg):
+        data = json.dumps(msg).encode('utf-8')
+        proc.stdin.write(f'Content-Length: {len(data)}\r\n\r\n'.encode('utf-8'))
+        proc.stdin.write(data)
+        proc.stdin.flush()
+
+    def recv(timeout_s=5):
+        content_length = 0
+        end = time.time() + timeout_s
+        while time.time() < end:
+            if proc.poll() is not None:
+                return None
+            ready = proc.stdout.readable()
+            if not ready:
+                time.sleep(0.05)
+                continue
+            line = proc.stdout.readline()
+            if not line:
+                time.sleep(0.05)
+                continue
+            line = line.decode('utf-8', errors='replace').strip()
+            if line.startswith('Content-Length:'):
+                content_length = int(line.split(':')[1].strip())
+            elif line == '' and content_length > 0:
+                body = proc.stdout.read(content_length).decode('utf-8', errors='replace')
+                return json.loads(body)
+        return 'TIMEOUT'
+
+    all_msgs = []
+    
+    send({
+        'jsonrpc': '2.0', 'id': 1, 'method': 'initialize',
+        'params': {
+            'processId': os.getpid(),
+            'capabilities': {
+                'textDocument': {'diagnostics': {'dynamicRegistration': False}},
+                'workspace': {'didChangeWatchedFiles': {'dynamicRegistration': False}}
+            },
+            'rootUri': f'file://{project_dir}',
+            'workspaceFolders': [{'uri': f'file://{project_dir}', 'name': Path(project_dir).name}]
+        }
+    })
+
+    # Read all messages until we get initialize result
+    end = time.time() + timeout
+    init_ok = False
+    while time.time() < end and not init_ok:
+        msg = recv(5)
+        if msg is None:
+            break
+        if msg == 'TIMEOUT':
+            continue
+        all_msgs.append(('init', msg))
+        if msg.get('id') == 1 and 'result' in msg:
+            init_ok = True
+
+    if not init_ok:
+        return all_msgs, f'INIT_TIMEOUT after {timeout}s'
+
+    send({'jsonrpc': '2.0', 'method': 'initialized', 'params': {}})
+
+    # Open file
+    file_uri = f'file://{file_path}'
+    with open(file_path) as f:
+        content = f.read()
+    
+    send({
+        'jsonrpc': '2.0', 'method': 'textDocument/didOpen',
+        'params': {
+            'textDocument': {
+                'uri': file_uri, 'languageId': 'kotlin',
+                'version': 1, 'text': content
+            }
+        }
+    })
+
+    # Collect messages for remaining time
+    end = time.time() + 30
+    while time.time() < end:
+        msg = recv(3)
+        if msg is None or msg == 'TIMEOUT':
+            continue
+        all_msgs.append(('open', msg))
+
+    # Shutdown
+    send({'jsonrpc': '2.0', 'id': 2, 'method': 'shutdown', 'params': {}})
+    
+    try:
+        proc.terminate()
+        proc.wait(timeout=3)
+    except:
+        proc.kill()
+    
+    return all_msgs, 'OK'
+
+if __name__ == '__main__':
+    file_path = os.path.abspath(sys.argv[1])
+    project_dir = os.path.abspath(sys.argv[2]) if len(sys.argv) > 2 else os.getcwd()
+    print(f'Project: {project_dir}')
+    print(f'File:    {file_path}\n')
+
+    msgs, status = run_diagnostics(project_dir, file_path)
+    
+    print(f'Status: {status}')
+    print(f'Messages received: {len(msgs)}\n')
+    
+    diag_count = 0
+    for phase, msg in msgs:
+        method = msg.get('method', '?')
+        if 'id' in msg:
+            method = f'response(id={msg["id"]})'
+        if 'error' in msg:
+            print(f'  [{phase}] {method} ERROR: {msg["error"]}')
+        elif method == 'window/logMessage':
+            print(f'  [{phase}] log: {msg.get("params",{}).get("message","")}')
+        elif method == 'window/showMessage':
+            print(f'  [{phase}] show: {msg.get("params",{}).get("message","")}')
+        elif method == 'textDocument/publishDiagnostics':
+            diags = msg.get('params', {}).get('diagnostics', [])
+            diag_count += len(diags)
+            uri = msg.get('params', {}).get('uri', '')
+            print(f'  [{phase}] publishDiagnostics ({len(diags)} items): {os.path.basename(uri)}')
+            for d in diags:
+                r = d.get('range', {})
+                s = r.get('start', {})
+                sev = {1:'E',2:'W',3:'I',4:'H'}.get(d.get('severity'),'?')
+                print(f'     {sev} {s.get("line",0)+1}:{s.get("character",0)+1} {d.get("message","")}')
+        elif method.startswith('response'):
+            if 'result' in msg:
+                caps = msg.get('result', {}).get('capabilities', {})
+                print(f'  [{phase}] {method} capabilities: {json.dumps(caps, indent=2)[:400]}')
+            else:
+                print(f'  [{phase}] {method}')
+        else:
+            print(f'  [{phase}] {method}: {json.dumps(msg, indent=2)[:200]}')
+    
+    print(f'\nTotal diagnostics: {diag_count}')

security-review-report.md

@@ -0,0 +1,333 @@
+# Android Backup GUI — 安全审查报告
+
+**审查日期**: 2026-06-06  
+**审查范围**: 37 个 Kotlin 源文件  
+**审查技能**: 安全漏洞检测（注入、Secret 泄露、权限滥用、路径遍历）
+
+---
+
+## 严重程度分级说明
+
+| 等级 | 定义 |
+|------|------|
+| CRITICAL | 可直接导致 root 提权、用户数据泄露或远程命令执行的漏洞。必须立即修复。 |
+| HIGH | 在特定条件下可导致敏感数据泄露或越权访问。应在下一版本修复。 |
+| MEDIUM | 安全风险较低，或需要复杂攻击链才能利用。建议规划修复。 |
+| LOW | 信息泄露风险极低，或设计上可接受但不够理想。可选修复。 |
+
+---
+
+## 发现汇总
+
+| # | 严重程度 | 类别 | 文件 | 行号 |
+|---|----------|------|------|------|
+| 1 | **CRITICAL** | Secret 泄露 | `BackupConfig.kt` | 69, 73, toFile() |
+| 2 | **CRITICAL** | Secret 泄露 | `BackupConfig.kt` | toFile() |
+| 3 | **HIGH** | 认证缺失 | `ResticRestBridge.kt` | 27 |
+| 4 | **HIGH** | 路径遍历/越权写入 | `RestoreOperation.kt` | restoreData() |
+| 5 | **MEDIUM** | 命令注入(Sed) | `RestoreOperation.kt` | 250-253 |
+| 6 | **MEDIUM** | 信息泄露(Logcat) | `RootShell.kt` | 55 |
+| 7 | **MEDIUM** | 路径遍历 | `ResticRestBridge.kt` | 246-257 |
+| 8 | **MEDIUM** | 信息泄露(Logcat) | `ResticCommandRunner.kt` | 40-41 |
+| 9 | **MEDIUM** | 加密/安全存储 | `BackupConfig.kt` | 68-73 |
+| 10 | **LOW** | 缺少参数验证 | `AppScanner.kt` | 多处 |
+| 11 | **LOW** | SMB 签名关闭 | `SmbTransport.kt` | 26 |
+| 12 | **LOW** | 证书固定缺失 | `WebdavTransport.kt` | 22-28 |
+
+---
+
+## 详细发现
+
+### 🔴 CRITICAL: 凭据明文存储在配置文件中
+
+**文件**: `BackupConfig.kt` 第 69 行  
+**文件**: `BackupConfig.kt` 第 73 行  
+**文件**: `BackupConfig.kt` toFile() 方法
+
+```kotlin
+// 第 69 行
+val resticPassword: String = "",
+// 第 73 行
+val resticBackendPass: String = "",
+```
+
+**问题**: Restic 仓库密码、SMB/WebDAV 密码以明文形式存储在 `backup_settings.conf` 文件中。配置文件位于 `filesDir/backup_settings.conf`，在 root 权限下对任何进程可读。`toFile()` 方法（~第 156-157 行）将密码直接写入文件：
+
+```kotlin
+appendLine("restic_password=\"${config.resticPassword}\"")
+appendLine("restic_backend_pass=\"${config.resticBackendPass}\"")
+```
+
+此外，UI 中密码以明文显示和编辑（`ConfigFragment.kt` 第 151 行）。
+
+**风险**: 任何具有 root 权限的进程（或通过漏洞获得 root 的恶意应用）可读取这些凭据。如果用户使用相同的 restic 密码保护多个设备，泄露范围会扩大。
+
+**建议**:
+1. 使用 Android `EncryptedSharedPreferences` 存储密码（加密后存储在配置目录）
+2. 密码字段在 UI 中使用 `inputType="textPassword"` 隐藏显示
+3. 考虑使用 Android Keystore 进行密钥管理
+4. 配置文件设置为仅 app 自身可读（`MODE_PRIVATE`，但 root 环境下效果有限）
+
+---
+
+### 🔴 CRITICAL: 配置文件写入默认权限不安全
+
+**文件**: `BackupConfig.kt` — `toFile()` 方法（~第 144 行）
+
+```kotlin
+fun toFile(config: BackupConfig, file: File) {
+    file.parentFile?.mkdirs()
+    file.writeText(buildString { ... })
+}
+```
+
+**问题**: `file.writeText()` 使用系统默认文件权限。在 Android 上，`filesDir` 中的文件默认模式为 `MODE_PRIVATE`，但 root 权限环境绕过此保护。此外没有任何文件权限的显式设置。
+
+**建议**: 保存配置文件后显式设置权限：
+```kotlin
+file.setReadable(true, true)  // owner-only readable
+file.setWritable(true, true)  // owner-only writable
+```
+
+考虑迁移到 Android KeyStore + EncryptedSharedPreferences。
+
+---
+
+### 🔴 HIGH: ResticRestBridge 绑定到所有网络接口且无认证
+
+**文件**: `ResticRestBridge.kt` 第 27 行
+
+```kotlin
+class ResticRestBridge(...) : NanoHTTPD(0) {
+```
+
+**问题**: `NanoHTTPD(0)` 绑定到 `0.0.0.0`（所有网络接口），随机端口。而桥接 URL 使用的是 `127.0.0.1`（`RestBridgeRunner.kt` 第 72 行），但服务器本身对所有接口开放。该桥接提供无需任何认证的完整备份仓库读写访问（`GET`/`POST`/`DELETE` blob、`HEAD` 检查、`list` 操作）。
+
+**风险**: 设备上任何进程（不需要 root）都可以扫描开放端口、连接到桥接，并读取或写入备份仓库。由于桥接在随机端口上运行且生命周期短暂，利用难度稍高但仍存在。
+
+**建议**:
+1. 使用 `ServerSocket(0, 50, InetAddress.getByName("127.0.0.1"))` 或 NanoHTTPD 的 `bindAddr` 参数显式绑定到 localhost
+2. 添加认证令牌（restic REST API 支持 token 认证）
+3. 限制响应时间窗口，使用后立即删除 blob
+
+---
+
+### 🔴 HIGH: Tar 解压使用 `-C /` 可能导致系统文件覆写
+
+**文件**: `RestoreOperation.kt` — `restoreData()` 方法（~第 137-149 行）
+
+```kotlin
+val baseCmd = when {
+    archive.name.endsWith(".zst") ->
+        "set -o pipefail; $zstdCmd -d -c '$archivePath' | $tarCmd -xf - $excludeArgs -C / 2>/dev/null"
+    ...
+}
+```
+
+**问题**: 备份存档使用根目录 `/` 解压。`isArchiveSafe` 方法（~第 220-232 行）仅检查 `..` 路径穿越和指向外部的符号链接，但**不检查**：
+- 存档中的绝对路径条目（如 `/etc/passwd`、`/system/bin/app_process`）
+- 硬链接（可绕过 `..` 检查）
+- 设备节点
+- 解压总量（可用于磁盘空间耗尽攻击）
+
+如果攻击者能够修改备份文件（例如通过恶意 App 访问外部存储），解压操作可覆写任意系统文件。
+
+**建议**:
+1. 添加对绝对路径的检查 —— 拒绝包含 `/` 前缀路径（绝对路径）的存档
+2. 使用 `isArchiveSafe` 补充绝对路径检测：`line.startsWith("/")`
+3. 考虑使用 `--strip-components` 选项或在临时目录解压后再移动到目标路径
+4. 添加存档大小和解压条目数量上限
+
+---
+
+### 🟡 MEDIUM: SSAID 恢复中的 Sed 命令注入风险
+
+**文件**: `RestoreOperation.kt` 第 250-253 行
+
+```kotlin
+val manipCmd = buildString {
+    append("sed -i \"/package.*${packageName.shellEscape()}/d\" '$targetFile' && ")
+    append("sed -i \"s#</settings>#<setting id=\\\"$id\\\" package=\\\"${packageName.shellEscape()}\\\" value=\\\"${ssaidValue.shellEscape()}\\\" defaultValue=\\\"default\\\" />\\n</settings>#\" '$targetFile'")
+}
+```
+
+**问题**: `ssaidValue` 和 `packageName` 虽然经过了 `shellEscape()`（处理单引号），但 Sed 模式中使用 `#` 作为分隔符。如果 `ssaidValue` 包含 `#`（UUID 不可能，但从文件读取的 SSAID 可能包含任意字符），会破坏 Sed 命令结构。此外，`shellEscape()` 只处理 shell 层的单引号，不处理 Sed 层的 `\`、`&`、`/` 等特殊字符。
+
+**风险**: 若攻击者可通过修改 `ssaid.txt` 文件插入恶意 Sed 表达式，可能导致任意文件写入。
+
+**建议**: 
+1. 使用纯 Kotlin XML 解析（如 `XmlPullParser`）操作 `settings_ssaid.xml`，而不是 Sed
+2. 或使用 `sed -e` 的分隔符参数引用，并验证 `ssaidValue` 只包含十六进制字符
+
+---
+
+### 🟡 MEDIUM: RootShell 启用了 libsu 详细日志
+
+**文件**: `RootShell.kt` 第 55 行
+
+```kotlin
+Shell.enableVerboseLogging = true
+```
+
+**问题**: libsu 的详细日志会将所有 shell 命令输出到 Logcat。Logcat 在 Android 上对任何具有 `READ_LOGS` 权限的应用可读。这可能导致命令路径、参数、错误消息等信息泄露。
+
+**风险**: 调试期间有助于开发，但生产版本应禁用。命令本身不包含密码（通过环境变量传递），但路径结构和目录名可能暴露敏感信息。
+
+**建议**: 
+1. 根据构建类型控制日志级别：
+```kotlin
+Shell.enableVerboseLogging = BuildConfig.DEBUG
+```
+2. 或完全移除该行
+
+---
+
+### 🟡 MEDIUM: ResticRestBridge JSON 手动拼接存在注入风险
+
+**文件**: `ResticRestBridge.kt` 第 246-257 行
+
+```kotlin
+private fun buildV2Json(items: List<RemoteTransport.RemoteFileInfo>): String {
+    val sb = StringBuilder("[")
+    var first = true
+    for (item in items) {
+        ...
+        sb.append("{\"name\":\"${item.name}\",\"size\":${item.size}}")
+    }
+    sb.append("]")
+    return sb.toString()
+}
+```
+
+**问题**: 文件名 `item.name` 直接插值到 JSON 字符串中。若远程存储上的文件名包含 `"`、`\\`、`\n` 等字符，会破坏 JSON 结构，可能导致解析错误或意外的数据暴露。
+
+**风险**: 文件名来自远程存储（SMB/WebDAV），攻击者可能控制这些名称。返回给 restic 的损坏 JSON 可能导致备份操作失败或状态误报。
+
+**建议**: 使用 `kotlinx-serialization` 或 `JSONArray` 构建 JSON。
+
+---
+
+### 🟡 MEDIUM: ResticCommandRunner 日志暴露仓库 URL
+
+**文件**: `ResticCommandRunner.kt` 第 40-41 行
+
+```kotlin
+Log.d(TAG, "runRestic REPOSITORY=${env["RESTIC_REPOSITORY"]}")
+```
+
+**问题**: 虽然代码注释正确指出 `RESTIC_PASSWORD` 不应记录，`RESTIC_REPOSITORY` 仍可能包含 SMB 共享名称、仓库路径等敏感信息。Logcat 可被其他应用读取。
+
+**建议**: 至少将敏感部分截断或哈希，或仅在 DEBUG 构建下记录。
+
+---
+
+### 🟡 MEDIUM: 多个凭据未加密存储在内存中
+
+**文件**: `BackupConfig.kt` 第 68-73 行
+
+```kotlin
+val resticPassword: String = "",
+val resticBackendUser: String = "",
+val resticBackendPass: String = "",
+```
+
+**问题**: `BackupConfig` 作为 `@Serializable data class`，所有密码字段在进程生命周期内以不可变字符串形式保存在内存中。字符串在 Java 中不可变，无法显式清除（零覆盖）。
+
+此外，`ResticWrapper` 的所有公开 API 方法都将密码作为方法参数传递，导致 Activity/Fragment/ViewModel 中密码的副本散布各处。
+
+**建议**:
+1. 通过值对象传递密码，操作完成后立即清除
+2. 考虑使用 `CharArray` 并在使用后填充空白
+3. 在传递之间最小化密码在 Kotlin 对象图中的驻留时间
+
+---
+
+### 🟢 LOW: AppScanner 中 userId 参数缺少非负验证
+
+**文件**: `AppScanner.kt` 多处
+
+```kotlin
+suspend fun scanThirdParty(context: Context, userId: Int = 0): List<AppInfo> = withContext(Dispatchers.IO) {
+    val result = RootShell.exec("pm list packages -3 --user $userId")
+```
+
+**问题**: `userId` 虽然类型为 `Int`，直接插值到 shell 命令中。如果传入负数（如 -1），可能导致意外行为。但 `userId` 来自 Spinner 选择或 `UserId` 值类（已验证非负），因此实际风险很低。
+
+**建议**: 在 UI 层、`UserId` 值类或 `AppScanner` 入口处增加正数验证。
+
+---
+
+### 🟢 LOW: SMB 传输默认关闭签名/加密
+
+**文件**: `SmbTransport.kt` 第 26 行
+
+```kotlin
+private val smbSigning: Boolean = false
+```
+
+**问题**: SMB 签名和加密默认禁用。在不安全的网络中，攻击者可进行 SMB 中继攻击。代码注释说明"多数家庭服务器不支持"，是合理的取舍。
+
+**建议**: 在 UI 配置页面添加 SMB 签名开关，让用户根据网络环境决定。
+
+---
+
+### 🟢 LOW: WebDAV 传输缺少证书固定
+
+**文件**: `WebdavTransport.kt` 第 22-28 行
+
+```kotlin
+private val sardine: Sardine by lazy {
+    OkHttpSardine().apply {
+        if (username.isNotEmpty()) {
+            setCredentials(username, password)
+        }
+    }
+}
+```
+
+**问题**: `OkHttpSardine` 使用默认的 HTTPS 配置，没有自定义证书验证或证书固定（Certificate Pinning）。中间人攻击（MITM）可窃取 WebDAV 的备份凭据。
+
+**建议**: 对于重视安全的场景，可选支持证书固定，或在 UI 中显示当前 HTTPS 证书指纹。
+
+---
+
+## 正向发现（设计良好的安全实践）
+
+| 实践 | 文件 | 说明 |
+|------|------|------|
+| ✅ 密码通过环境变量传递 | `ResticEnvResolver.kt` | RESTIC_PASSWORD 通过 env 传递，不在命令行中出现 |
+| ✅ `shellEscape()` 一致使用 | `root/RootShell.kt:15` | 所有 shell 拼接参数都经过了转义 |
+| ✅ `execSafe()` 安全方法 | `root/RootShell.kt:95-101` | 提供自动参数转义的执行方法 |
+| ✅ ProcessBuilder 列表参数 | `ResticCommandRunner.kt` | 使用 List<String> 参数，无 shell 拼接 |
+| ✅ `isArchiveSafe()` 路径穿越检查 | `RestoreOperation.kt:220-232` | 解压前检查 `..` 和危险符号链接 |
+| ✅ 类型安全的值类 | `DomainTypes.kt` | `PackageName` 和 `UserId` 提供编译期类型安全 |
+| ✅ 定时命令超时 | `RootShell.kt:26` | 120 秒超时防止命令挂死 |
+| ✅ 取消传播 | 多处 | CancellationException 正确重新抛出 |
+| ✅ RESTIC_PASSWORD 不记录日志 | `ResticCommandRunner.kt:42` | 明确注释不记录密码 |
+
+---
+
+## 风险优先级建议
+
+### 立即修复 (CRITICAL)
+1. **BackupConfig.kt**: 使用 `EncryptedSharedPreferences` 替换明文配置存储
+2. **BackupConfig.kt**: 保存后设置文件权限为 `MODE_PRIVATE`
+
+### 下一版本修复 (HIGH)
+3. **ResticRestBridge.kt**: 绑定到 127.0.0.1 而非 0.0.0.0
+4. **RestoreOperation.kt**: `isArchiveSafe` 增加绝对路径检查；解压到临时目录再移动
+
+### 规划修复 (MEDIUM)
+5. **RestoreOperation.kt**: SSAID XML 操作改为 XML 解析器而非 Sed
+6. **ResticRestBridge.kt**: JSON 改用序列化库构建
+7. **RootShell.kt**: 生产环境禁用详细日志
+8. **ResticCommandRunner.kt**: 截断或保护仓库 URL 日志
+
+### 可选改进 (LOW)
+9. **SmbTransport.kt**: 考虑默认启用 SMB 签名
+10. **WebdavTransport.kt**: 可选证书固定支持
+11. **AppScanner.kt**: 添加 userId 验证
+
+---
+
+*注意: 本报告未包含 `memory://root/memory_summary.md` 中记录的 7 个已知待处理项。*

silent-failure-review.md

@@ -0,0 +1,484 @@
+# 静默失败审查报告 — android-backup-gui
+
+> 审查日期: 2026-06-06
+> 审查范围: 37 个 Kotlin 源文件
+> 已排除: memory://root 已知的 7 个待处理项
+
+---
+
+## 严重程度分级
+
+- **CRITICAL**: 数据静默损坏或丢失，用户无法感知
+- **HIGH**: 错误被吞没，导致后续操作基于错误假设继续
+- **MEDIUM**: 错误被吞没但影响范围有限，或仅影响辅助功能
+- **LOW**: 微小错误处理缺失，实际影响小
+
+---
+
+## 发现清单
+
+### F1 [HIGH] — SMB 上传大小不匹配不报告错误
+
+**文件**: `SmbTransport.kt:103-109`
+**类型**: 未检查的返回值 / 静默数据损坏
+
+```kotlin
+if (actualSize != fileSize) {
+    Log.w(TAG, "upload size mismatch: local=$fileSize smb=$actualSize")
+    SmbFileOutputStream(remote).use { it.write(ByteArray(0)) }
+    val retrySize = freshRemote.length()
+    Log.w(TAG, "upload retry: smb=$retrySize bytes")
+}
+// 继续返回 Success(Unit)
+```
+
+即使 SMB 端实际存储的字节数与本地不一致，`upload()` 仍返回 `AppResult.Success(Unit)`。写入零字节空数组的"修复"尝试没有验证效果。如果 SMB 服务器写入缓存有问题或磁盘空间不足，restic blob 数据可能部分损坏，而上层调用者 (`RestBridgeRunner`) 不知道。
+
+**建议**: 当 `actualSize != fileSize` 时，应返回 `err(AppError.Remote("SMB 上传大小不匹配: local=$fileSize vs smb=$actualSize", "upload"))`。
+
+---
+
+### F2 [HIGH] — backupUserData 全失败时返回成功
+
+**文件**: `BackupOperation.kt:255-257`
+**类型**: 错误替换/空回退
+
+```kotlin
+if (!archiveCreated) {
+    Log.w(TAG, "backupUserData: $packageName all methods failed ...")
+    return true  // 返回成功！
+}
+```
+
+当三种数据备份方法全部失败时（目录不存在、权限不足、tar 不可用），函数返回 `true`。上层调用者 (`BackupOperation.backupApps` line 131) 看到 `true` 就认为数据备份成功，累加 `successAtomic`，用户看到的报告就是"成功"。应用的用户数据被静默跳过。
+
+**建议**: 改为 `return false` 让调用者知道数据备份实际失败。如果需要容错（某些应用确实没有数据目录），应在 `backupUserData` 外部判断，或返回区分"跳过"和"失败"的信号。
+
+---
+
+### F3 [HIGH] — CancellationException 被空 catch 吞没
+
+**文件**: `ResticBackup.kt:55-58`, `ResticBackup.kt:73-77`, `ResticBackup.kt:117-120`, `ResticBackup.kt:130-134`
+**类型**: 异步错误丢失
+
+```kotlin
+try {
+    val progress = resticJson.decodeFromString<ResticWrapper.ResticProgress>(line)
+    if (progress.messageType == "status") emit(progress)
+} catch (_: Exception) { }
+```
+
+`catch (_: Exception)` 会捕获 `kotlinx.coroutines.CancellationException`。如果协程在 JSON 解析期间被取消，取消信号被吞没，进度回调继续运行。虽然在 `runResticStreaming`/`runResticWithStdin` 内部也有协程活跃检查（`!coroutineContext.isActive`），但取消信号仍可能延迟或丢失。
+
+**建议**: 在空 catch 前加 `catch (e: CancellationException) { throw e }`，或改用 `catch (e: Exception) { if (e is CancellationException) throw e }`。
+
+---
+
+### F4 [HIGH] — WebDAV mkdirs 完全失败时仍返回成功
+
+**文件**: `WebdavTransport.kt:153-155`
+**类型**: 错误替换
+
+```kotlin
+} catch (e: Exception) {
+    Log.w(TAG, "mkdirs failed: $remotePath — ${e.message}")
+    AppResult.Success(Unit)  // best-effort
+}
+```
+
+即使所有目录层级都无法创建，该方法返回 `AppResult.Success(Unit)`。注释说"upload will fail if dir can't be created"，但上传可能在更深层的操作上以不同的错误信息失败（如"permission denied" vs "directory not found"），使诊断更加困难。上层调用者无法区分"目录已存在"和"完全无法创建"。
+
+**建议**: 仅在确定目录确实存在时返回 Success（如 SMB 实现中检测 `STATUS_OBJECT_NAME_COLLISION`）。对所有其他异常应返回 `err(AppError.Remote(...))`。
+
+---
+
+### F5 [MEDIUM] — WifiManager.restore 始终返回 true
+
+**文件**: `WifiManager.kt:54-85`
+**类型**: 错误替换
+
+整个 `restore()` 方法始终返回 `true`（line 84），即使：
+- `findWifiConfigPath()` 返回 null 且 fallback 路径无法创建目录（line 63-64 返回 false，但被统一 return@withContext false 处理... 等等这里 line 84 是最后一行）
+  - 实际上 line 63 `return@withContext false` 确实会提前返回。但如果成功执行到 line 84，无论如何都返回 true。中间 `cp`、`chown`、`chmod` 的失败仅被记录日志，不通知调用者。
+
+**建议**: `cp` 或 `chmod`/`chown` 失败时应返回 false。当前 RestoreFragment 中 `WifiManager.restore(dir)` 的返回值没有被使用，但接口应该诚实。
+
+---
+
+### F6 [MEDIUM] — ResticWrapper.getLatestSnapshotAppDetails 静默返回 null
+
+**文件**: `ResticWrapper.kt:270-275`, `ResticWrapper.kt:288`
+**类型**: 空回退
+
+```kotlin
+is AppResult.Failure -> {
+    Log.w(TAG, "getLatestSnapshotAppDetails: listSnapshots failed: ...")
+    null
+}
+// 和
+is AppResult.Failure -> return@withContext null
+```
+
+当 `listSnapshots()` 或 `dump()` 失败时返回 `null`。调用者 (`BackupFragment.kt:228`) 仅检查 `snapshotApps != null`，看到 null 就跳过累积快照逻辑。用户不知道仓库存在但无法读取——也可能是仓库密码错误、网络问题或权限问题。但此行为在 API 文档中有意说明，且后续备份仍能工作，只是失去了累积合并能力。
+
+**建议**: 考虑返回 `AppResult<Map<String, SnapshotAppInfo>?>` 以区分"无快照"和"读取失败"。或者增加 UI 通知。
+
+---
+
+### F7 [MEDIUM] — parseAppDetailsJson 捕获所有异常
+
+**文件**: `ResticWrapper.kt:315-317`
+**类型**: 被吞没的异常
+
+```kotlin
+} catch (_: Exception) {
+    Log.w(TAG, "parseAppDetailsJson: failed to parse JSON")
+}
+```
+
+捕获所有 `Exception` 类型（包括 `CancellationException`、`OutOfMemoryError` 等）。虽然当前函数在 `Dispatchers.IO` 上下文外的同步路径调用，但应该缩小异常范围。
+
+**建议**: 改为 `catch (e: org.json.JSONException)`。
+
+---
+
+### F8 [MEDIUM] — StreamingBackup mkfifo 失败不报告
+
+**文件**: `StreamingBackup.kt:50`
+**类型**: 未检查的返回值
+
+```kotlin
+RootShell.exec("mkfifo '${fifo.absolutePath.shellEscape()}'")
+```
+
+`mkfifo` 的执行结果完全被忽略。如果 `mkfifo` 失败（例如文件系统只读、磁盘满），FIFO 文件不存在，后续 `restic backup --stdin` 会以模糊的错误失败。`StreamingBackup.prepareStreaming` 返回的 `StreamingResult` 将包含无效的 FIFO 路径。调用者在 `BackupFragment.kt:484` 直接使用结果，没有验证 FIFO 是否创建成功。
+
+**建议**: 检查结果并抛出异常或返回失败信号。
+
+---
+
+### F9 [MEDIUM] — BackupFragment 中 restore 操作结果被忽略
+
+**文件**: `ui/BackupFragment.kt:274-284`
+**类型**: 未检查的返回值
+
+```kotlin
+ResticWrapper.restore(
+    repoPath = config.resticRepo,
+    password = config.resticPassword,
+    snapshotId = latestSnap.shortId,
+    targetPath = backupRoot.absolutePath,
+    ...
+)
+```
+
+在累积备份流程中，从 restic 仓库恢复最新快照到本地暂存目录的结果完全被忽略。如果恢复失败（例如密码错误、网络中断），`backupRoot` 目录可能不完整，但备份操作继续执行。后续 `BackupOperation.backupApps` 可能会基于不完整的文件结构工作。
+
+**建议**: 检查 `restore()` 的 `AppResult`，如果失败则终止备份流程并通知用户。
+
+---
+
+### F10 [MEDIUM] — StreamingBackup.launchDataProducer 的 tar 失败仅记录日志
+
+**文件**: `StreamingBackup.kt:116-118`
+**类型**: 被吞没的异常
+
+```kotlin
+if (!result.isSuccess) {
+    Log.w(TAG, "Data backup failed for $pkgName: ${result.error}")
+}
+```
+
+单个应用的 tar 数据备份失败时仅记录日志，继续下一个应用。调用者 (`BackupFragment.kt:534`) 通过 `producerJob.await()` 等待完成，但该函数总是返回 `true`（除非协程被取消）。这意味着即使某些应用的数据完全没有备份，调用者也认为一切正常。restic 对缺失数据无法感知——它只归档了 FIFO 中收到的内容。
+
+**建议**: 收集失败列表并通过返回值或回调通知调用者。
+
+---
+
+### F11 [MEDIUM] — RestBridgeRunner 中未识别的后端静默穿透
+
+**文件**: `RestBridgeRunner.kt:61`
+**类型**: 空回退
+
+```kotlin
+val t = transportFactory(...)
+    ?: return block(repoPath)
+```
+
+当 `RemoteTransport.create()` 返回 `null`（未知 backend），代码直接调用 `block(repoPath)`，其中 `repoPath` 是原始路径字符串而不是桥接 URL。restic 会收到一个可能无效的仓库 URL，产生令人困惑的错误（"repository doesn't exist" 而不是"未知后端类型"）。
+
+**建议**: 至少记录一个错误，或抛出异常说明后端类型不支持。
+
+---
+
+### F12 [MEDIUM] — SMB listFiles 在无权限时静默返回空列表
+
+**文件**: `SmbTransport.kt:165-186`
+**类型**: 空回退
+
+```kotlin
+val entries = dir.listFiles()
+    ?.map { f -> ... }
+    ?: emptyList()
+```
+
+`SmbFile.listFiles()` 在 SMB 权限不足时可能返回 `null`。此时 `?: emptyList()` 将静默返回空列表。调用者可能认为路径是空的，而不是没有读取权限。SMB 协议可以在 `SmbException` 中返回具体的 ntStatus 错误，但这里的 null 合并将错误掩盖了。
+
+**建议**: 在 `else` 分支或 `catch` 中检查文件是否确实存在，如果存在但 listFiles 返回 null，应返回错误而非空列表。
+
+---
+
+### F13 [MEDIUM] — backupPermissions 静默跳过
+
+**文件**: `BackupOperation.kt:349-354`
+**类型**: 被吞没的异常
+
+```kotlin
+private suspend fun backupPermissions(packageName: String, appDir: File) {
+    val result = RootShell.exec("dumpsys package ...")
+    if (result.output.isNotBlank()) {
+        File(appDir, "permissions.txt").writeText(result.output)
+    }
+}
+```
+
+如果 `dumpsys package` 命令失败或输出为空，权限备份静默跳过。`backupApps` 在 line 163 调用此函数时不检查结果，也不记录错误。恢复时将没有权限文件，应用以默认权限运行。
+
+**建议**: 至少在 `dumpsys` 命令失败时记录日志。考虑返回 `Boolean` 让调用者知晓。
+
+---
+
+### F14 [MEDIUM] — backupSsaid 静默跳过
+
+**文件**: `BackupOperation.kt:331-347`
+**类型**: 被吞没的异常
+
+```kotlin
+private suspend fun backupSsaid(packageName: String, appDir: File, userId: String) {
+    val result = RootShell.exec("cat '$ssaidFile' 2>/dev/null")
+    if (!result.isSuccess || result.output.isBlank()) return
+    // ...
+}
+```
+
+如果 XML 文件无法读取或解析失败，SSAID 备份完全静默跳过。SSAID 是 Google 广告标识符，丢失后用户可能收到新的 ID。
+
+**建议**: 在 cat 命令失败时记录警告日志。
+
+---
+
+### F15 [MEDIUM] — initResticRepo 使用 exceptionOrNull 可能导致 null 显示
+
+**文件**: `ui/ConfigViewModel.kt:205-207`
+**类型**: 错误替换
+
+```kotlin
+Log.e(TAG, "initResticRepo failed: ${result.exceptionOrNull()?.message}")
+_uiState.update { it.copy(resticStatus = it.resticStatus.copy(
+    message = "初始化失败: ${result.exceptionOrNull()?.message}"
+))}
+```
+
+`AppResult.exceptionOrNull()` 创建一个新的 `RuntimeException`，如果原始 `AppError.message` 为 null（例如 `AppError.Restic("", -1, "")`），用户将看到 "初始化失败: null"。
+
+**建议**: 使用 `${result.errorOrNull()?.message ?: "未知错误"}`。
+
+---
+
+### F16 [MEDIUM] — RestBridgeRunner 中临时文件删除结果未检查
+
+**文件**: `RestBridgeRunner.kt:85-88`
+**类型**: 资源泄露
+
+```kotlin
+val blobs = cacheDir.listFiles { f -> f.name.startsWith("restic_blob_") }
+if (blobs != null) {
+    for (f in blobs) f.delete()
+}
+```
+
+临时 blob 文件删除的结果未检查，且 `listFiles` 筛选器可能遗漏子目录中的临时文件（如 `ResticRestBridge` 在 `cacheDir` 中创建 `restic_blob_*` 文件）。随着操作频繁进行，可能累积未清理的临时文件。
+
+**建议**: 使用 `f.delete()` 的返回值进行日志记录，并考虑递归清理。
+
+---
+
+### F17 [LOW] — RootShell.ensureSession 静默返回 false
+
+**文件**: `root/RootShell.kt:63-67`
+**类型**: 被吞没的异常
+
+```kotlin
+suspend fun ensureSession(): Boolean = withContext(Dispatchers.IO) {
+    try {
+        Shell.getShell().isRoot
+    } catch (_: Exception) { false }
+}
+```
+
+如果 `Shell.getShell()` 抛出任何异常（包括 `NullPointerException`、`RuntimeException`），静默返回 `false`。调用者无法区分"没有 root 权限"和"libsu 未初始化或其他错误"。
+
+**建议**: 记录异常。可以考虑区分不同类型的失败。
+
+---
+
+### F18 [LOW] — AppScanner 多项查询静默失败
+
+**文件**: `AppScanner.kt:41,53,96`
+**类型**: 空回退
+
+```kotlin
+if (!result.isSuccess) return@withContext emptyList()
+```
+
+`scanThirdParty`、`scanSystem`、`getApkPaths` 在 shell 命令失败时返回空列表。如果 `pm list packages` 因为 root 权限临时问题失败，用户看到的应用列表为空，但没有任何错误提示。
+
+**建议**: 在 UI 层调用前检查返回的空列表并显示适当消息（已在 `BackupFragment.scanApps()` 中捕获异常，但 shell 层面的失败可能被漏过）。
+
+---
+
+### F19 [LOW] — backupUserData tar 命令可能静默失败
+
+**文件**: `BackupOperation.kt:228`
+**类型**: 未检查的返回值
+
+```kotlin
+val dirs = dataPaths.filter { RootShell.exec("test -d '${it.shellEscape()}'").isSuccess }.toMutableList()
+```
+
+`test -d` 在 nsenter namespace 切换后可能对某些路径返回假阴性。如果所有 `test -d` 都失败，`dirs` 为空列表，代码会转到 `else` 分支（line 234-238）尝试直接运行 tar，而 tar 也会因为没有源路径而静默失败或产生空归档。此时 `archiveCreated` 保持 false，进入 line 255 的 fallback 处理——但这个 fallback 返回 true（见 F2）。
+
+**建议**: 如果 `dirs` 为空且 tar 直接执行也未产生输出，应返回明确的失败信号。
+
+---
+
+### F20 [LOW] — WifiManager.backup 结果未在 BackupOperation 中检查
+
+**文件**: `ui/BackupFragment.kt:310`
+**类型**: 未检查的返回值
+
+```kotlin
+WifiManager.backup(File(result.outputDir))
+```
+
+WiFi 配置备份的结果完全被忽略。如果 WiFi 备份失败，用户不会收到任何通知。`WifiManager.backup()` 可以返回 `null`（失败时），但调用者没有使用返回值。
+
+**建议**: 至少记录结果，考虑在最终摘要中显示 WiFi 备份状态。
+
+---
+
+### F21 [LOW] — estimateBackupSize 忽略 du 错误
+
+**文件**: `ui/BackupFragment.kt:440-449`
+**类型**: 未检查的返回值
+
+```kotlin
+val result = RootShell.exec("du -sb /data/data/$pkgEsc 2>/dev/null | cut -f1")
+val size = result.output.trim().toLongOrNull() ?: 0L
+```
+
+如果 `du` 命令失败、输出为空或解析失败，该应用的估计大小为 0。最终的空间估算可能严重偏低（仅用于判断是否需要流式备份），可能导致本应触发流式备份的大数据集使用暂存模式。
+
+**建议**: 考虑使用保守的默认值或根据应用大小粗略估算。
+
+---
+
+### F22 [LOW] — BackupOperation 中 chmod 结果未检查
+
+**文件**: `BackupOperation.kt:173`
+**类型**: 未检查的返回值
+
+```kotlin
+RootShell.exec("chmod -R 0755 '${backupRoot.absolutePath}'")
+```
+
+备份完成后设置目录权限的结果未检查。虽然不影响备份数据的完整性，但如果 `chmod` 失败，后续读取备份的用户可能会遇到权限问题。
+
+**建议**: 至少记录 `chmod` 失败日志。
+
+---
+
+### F23 [LOW] — BackupFragment 中前台服务启动异常被吞没
+
+**文件**: `ui/BackupFragment.kt:193-195`
+**类型**: 被吞没的异常
+
+```kotlin
+try {
+    ContextCompat.startForegroundService(requireContext(), serviceIntent)
+} catch (_: Exception) {}
+```
+
+如果前台服务启动失败（例如缺少权限、应用在后台），异常被完全吞没。备份操作仍然继续，但进程可能被 Android 杀死。
+
+**建议**: 记录异常，考虑通知用户服务启动失败。
+
+---
+
+### F24 [LOW] — ConfigFragment 中 OperationEvent 的 InitFailed/PruneFailed 不显示错误详情
+
+**文件**: `ui/ConfigFragment.kt:157-159`
+**类型**: 错误替换
+
+```kotlin
+is OperationEvent.InitFailed -> {
+    Log.d(TAG, "init failed")
+    Snackbar.make(binding.root, "仓库初始化失败", Snackbar.LENGTH_SHORT).show()
+}
+```
+
+InitFailed/PruneFailed 事件不携带错误详情，用户只看到"初始化失败"/"清理失败"，不知道具体原因。实际错误消息在 ViewModel 的 `resticStatus.message` 中已经设置，但 UI 没有在 snackbar 中使用它。
+
+**建议**: 从 ViewModel 状态读取错误详情并在 snackbar 中显示，或让 OperationEvent 携带错误消息。
+
+---
+
+### F25 [LOW] — RestBridgeRunner 中缓存传输不被清理
+
+**文件**: `RestBridgeRunner.kt:58-63`
+**类型**: 资源泄露
+
+```kotlin
+if (cachedTransportKey != key) {
+    cachedTransport?.let { Log.d(TAG, "discarding stale cached transport") }
+    val t = transportFactory(...)
+    ...
+    cachedTransport = t
+    cachedTransportKey = key
+}
+```
+
+当缓存键变化时，旧的 `cachedTransport`（SMB 会话或 WebDAV client）被直接丢弃而不关闭。对于 `SmbTransport`，内部的 `CIFSContext` 和 jcifs-ng 连接可能保持打开，直到 GC 触发 finalizer。对于 `WebdavTransport`，OkHttp 客户端可能保持连接池和线程。
+
+**建议**: 如果 `RemoteTransport` 接口添加 `close()` 方法，在替换缓存时调用。
+
+---
+
+## 分类统计
+
+| 严重程度 | 数量 | 关键文件 |
+|---|---|---|
+| HIGH | 4 | SmbTransport, BackupOperation, ResticBackup, WebdavTransport |
+| MEDIUM | 12 | ResticWrapper(2), StreamingBackup(2), BackupFragment, WifiManager, RestBridgeRunner, SmbTransport, BackupOperation(2), ConfigViewModel, AppScanner |
+| LOW | 9 | RootShell, AppScanner(3), BackupFragment(3), BackupOperation, ConfigFragment, RestBridgeRunner |
+
+**发现总数**: 25
+
+---
+
+## 总结与优先修复建议
+
+### 必须修复 (HIGH)
+1. **F1** (`SmbTransport.kt:103-109`) — SMB 上传后大小校验失败应返回错误，而非静默继续
+2. **F2** (`BackupOperation.kt:255-257`) — `backupUserData` 全方式失败时返回 `true` 是在告知上层"数据已备份"
+3. **F3** (`ResticBackup.kt:55-58` 等) — 进度回调中的空 catch 吞没 `CancellationException`，需添加重新抛出
+4. **F4** (`WebdavTransport.kt:153-155`) — `mkdirs` 完全失败返回 Success 是错误替换
+
+### 高优先级 (MEDIUM)
+- **F10** — `StreamingBackup.launchDataProducer` 不传播 tar 错误
+- **F12** — `SmbTransport` listFiles 返回 null 时可能是权限问题
+- **F13/F14** — `backupPermissions`/`backupSsaid` 静默跳过
+- **F8** — `StreamingBackup.mkfifo` 结果未检查
+
+### 建议
+整个代码库中使用 `catch (_: Exception)` 的模式需要系统性审查：应在所有协程 lambda 中的空 catch 前加 `catch (e: CancellationException) { throw e }`。关键入口点（如 `ResticBackup.kt:58`）已有 `CancellationException` 被吞没的问题。