If you wanna hack some native application like Music.apk – it’s really simple.
- Download and make android platform under linux
- Copy app (like packages\apps\Music) and create android eclipse project from it
- Add “out\target\common\obj\JAVA_LIBRARIES\framework_intermediates\classes.jar” library to the java build path (on top of android library)
- Rename package (you cannot replace system app) or create platform image without modified application
- Compile .apk in eclipse and enjoy