Android 2.3 代码混淆proguard技术介绍

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

[c-sharp] view plaincopy

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

我们可以看到proguard.cfg已经帮我们写好了优化代码脚本

[c-sharp] view plaincopy

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 ;
15. }
16. -keepclasseswithmembernames class /* {
17. public (android.content.Context, android.util.AttributeSet);
18. }
19. -keepclasseswithmembernames class /* {
20. public (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. }

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/examples中的例子及注释。)

接下来 按照google帮助文档里说的

[c-sharp] view plaincopy

1. To enable ProGuard so that it runs as part of an Ant or Eclipse build, set the proguard.config property in the /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

[c-sharp] view plaincopy

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

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如下图

是不是很轻松加愉快!希望各位程序员都能保护好自己的Android代码! 来源： [http://blog.csdn.net/Zengyangtech/article/details/6127600](http://blog.csdn.net/Zengyangtech/article/details/6127600)