Android proguard 时报错，Duplicate zip entry

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':0.2phone:proguardRelease'. > java.io.IOException: Can't write D:\0.2phone\build\intermediates\classes-proguard\release\classes.jar] (Duplicate zip entry [android-support-v4.jar:android/support/v4/hardware/display/DisplayManagerCompat.class]))

搞了许久没有解决，实在没办法了，只能求助论坛里的大神。项目引用了另一个项目，单独编译可以通过。

你两个项目是不是单独引用了support-v4，推荐你把被引用的项目做成library，再编译项目的时候不要把support-v4.jar放到被引用的项目的lib目录里

http://blog.csdn.net/love_javc_you/article/details/42970521