Protecting your Android Apps

Step-by-Step Guide To Decompiling Android Apps
http://infosecguide.wordpress.com/2013/12/17/step-by-step-guide-to-decompiling-android-apps/

 

How to decompile Android apk to Java source code
http://www.learn2crack.com/2013/08/decompile-android-apk-to-java.html

 

Is there a way to get the source code from an APK file? [closed]
http://stackoverflow.com/questions/3593420/is-there-a-way-to-get-the-source-code-from-an-apk-file