Code Crush Android

I want to crush the code of my android app so that it's 开发者_开发问答very hard to refactor it.

Which tool do i use to crush the Javacode?

Thanks and best regards, Till

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You probably want to use something like ProGuard. It will shrink, optimize, and obfuscate your Java and works with Android.

http://proguard.sourceforge.net/index.html#/manual/examples.html#androidapplication