HotFix 混淆apk生成patch包方案 /sdk中tools混淆插件proguardgui.bat简单说明

android 热修复框架目前了解的有qq空间分包方案的HotFix 和Nuwa,还有阿里开源的AndFix和Dexposed.

https://github.com/dodola/HotFix

https://github.com/jasonross/Nuwa

https://github.com/alibaba/AndFix

https://github.com/alibaba/dexposed

关于项目的原理可以看下两位大神的博客学习下：

http://blog.csdn.net/lmj623565791/article/details/49883661

http://blog.csdn.net/qxs965266509/article/details/50390325

由于AndFix只能更改类中的方法实现，而Dexposed目前还不支持Art(5.0在测试中)，

所以研究了一下HotFix及Nuwa的实现（dalvik）。

HotFix及Nuwa的实现原理基本一致，都是在Application中将patch包写到第一个dex文件中然后加载修改后的类。由于Nuwa的patch包按照文档说明的流程本人未实现，所以着重研究了下HotFix的实现。

HotFix 文档中只是给出了一个解决混淆的方案，未注明流程，下面是经过测试成功的一个打混淆patch包的流程：

1、在第一次打包apk的时候需要在混淆文件中加入一行代码，输出混淆前后的映射：

mapping.txt

2、打包apk成功后，会在build\outputs\mapping下生成一个mapping文件，此文件需要保持，以后打包混淆patch需要此文件。

3、将修改的类使用eclipse打包jar（注：修改的类不能是在Application中初始化的类）

4、使用android-sdk-windows\tools\proguard\bin\proguardgui.bat 工具对jar包进行混淆

    混淆配置文件就使用打包apk时的配置文件，工具的Obfuscation--Apply mapping选项选中，并将打包apk生成的mapping文件引入，执行jar的混淆操作。

5、混淆jar包执行  dx --dex --output=生成的dex包   混淆包  ，生成的dex包就是我们需要的path_dex.jar

android sdk中tools混淆插件proguardgui.bat简单说明

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