Android如何防止apk程序被反编译

让proguard.cfg起作用的做法很简单，就是在eclipse自动生成的default.properties文件中加上一句“proguard.config=proguard.cfg”就可以了

完整的default.properties文件应该如下：

 # This file is automatically generated by Android Tools.
 # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
 #
 # This file must be checked in Version Control Systems.
 #
 # To customize properties used by the Ant build system use,
 # "build.properties", and override values to adapt the script to your
 # project structure.

 # Project target.
 target=android-9
 proguard.config=proguard.cfg

大功告成，正常的编译签名后就可以防止代码被反编译了。反编译经过代码混淆的apk得到的代码应该类似于下面的效果，是很难看懂的：

原文：http://blog.csdn.net/vipzjyno1/article/details/21039349/