It is my time to contribute a little bit to this awesome project.
Here’s a patch that fixes the crash issues when playing sound and when quitting the application.
Just unpack these files into your android/src/org/cocos2dx/lib folder.
The problem was that the Java files in the test application and thus the ones that are generated for Android projects contains incorrect and missing methods.
cocos2d-patch.zip (17.7 KB)