proguard

# disable shuffle inner class of class 
-keep class com.xxx.xxxx.ListActivity$* {
    public <fields>;
    public <methods>;

}

http://blog.sina.com.cn/s/blog_4e1e357d0101cjz8.html

https://code.google.com/p/google-gson/source/browse/trunk/examples/android-proguard-example/proguard.cfg