Android 2.3 代码混淆proguard技术介绍

由于各种反编译工具的泛滥，作为Android程序员在2.3版本以前只能通过手动添加proguard来实现代码混淆

proguard这个工具是一个java代码混淆的工具

在2.3版本的sdk中 我们可以看到在android-sdk-windows/tools/下面多了一个proguard文件夹

google已经把proguard技术放在了android sdk里面 可以通过正常的编译方式也能实现代码混淆了

可以看见新建一个工程里面有default.properties和proguard.cfg

默认的default.properties代码如下

1. # This file is automatically generated by Android Tools.
   
2. # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
   
3. #
   
4. # This file must be checked in Version Control Systems.
   
5. #
   
6. # To customize properties used by the Ant build system use,
   
7. # "build.properties", and override values to adapt the script to your
   
8. # project structure.
   
9. # Project target.
   
10. target=android-9

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我们可以看到proguard.cfg已经帮我们写好了优化代码脚本

1. -optimizationpasses 5
   
2. -dontusemixedcaseclassnames
   
3. -dontskipnonpubliclibraryclasses
   
4. -dontpreverify
   
5. -verbose
   
6. -optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
   
7. -keep public class * extends android.app.Activity
   
8. -keep public class * extends android.app.Application
   
9. -keep public class * extends android.app.Service
   
10. -keep public class * extends android.content.BroadcastReceiver
    
11. -keep public class * extends android.content.ContentProvider
    
12. -keep public class com.android.vending.licensing.ILicensingService
    
13. -keepclasseswithmembernames class * {
    
14. native <methods>;
    
15. }
    
16. -keepclasseswithmembernames class * {
    
17. public <init>(android.content.Context, android.util.AttributeSet);
    
18. }
    
19. -keepclasseswithmembernames class * {
    
20. public <init>(android.content.Context, android.util.AttributeSet, int);
    
21. }
    
22. -keepclassmembers enum * {
    
23. public static **[] values();
    
24. public static ** valueOf(java.lang.String);
    
25. }
    
26. -keep class * implements android.os.Parcelable {
    
27. public static final android.os.Parcelable$Creator *;
    
28. }

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从脚本中可以看到，混淆中保留了继承自Activity、Service、Application、BroadcastReceiver、ContentProvider等基本组件以及com.android.vending.licensing.ILicensingService

并保留了所有的Native变量名及类名，所有类中部分以设定了固定参数格式的构造函数，枚举等等。(详细信息请参考<proguard_path>/examples中的例子及注释。)

接下来 按照google帮助文档里说的

To enable ProGuard so that it runs as part of an Ant or Eclipse build, set the proguard.config property in the <project_root>/default.properties file. The path can be an absolute path or a path relative to the project's root.

所以我们修改default.properties file

加上一句

proguard.config=proguard.cfg

如下

1. # This file is automatically generated by Android Tools.
   
2. # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
   
3. #
   
4. # This file must be checked in Version Control Systems.
   
5. #
   
6. # To customize properties used by the Ant build system use,
   
7. # "build.properties", and override values to adapt the script to your
   
8. # project structure.
   
9. # Project target.
   
10. target=android-9
    
11. proguard.config=proguard.cfg

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然后正常的编译签名即可

然后用Android Tools生成一个发布的apk即可

然后用反编译工具查看dex文件

最后导出反编译之后的混淆代码

Android 2.3 代码混淆proguard技术介绍
http://www.sanrenxue.com/forum.php?mod=viewthread&tid=117