Hi, I have added preloadBackgroundMusic and unloadBackgroundMusic to android-port
You can check the attached files see if it can add into repository or not. 
I also changed prepare/stop to pause/seekTo in order to prevent a little lag(I/O time) when loading BGM.
SimpleAudioEngineJni.h.zip (0.5 KB)
Cocos2dxActivity.java.zip (2.6 KB)
Cocos2dxMusic.java.zip (1.5 KB)
SimpleAudioEngine.h.zip (1.9 KB)
SimpleAudioEngine.cpp.zip (1.3 KB)
SimpleAudioEngineJni.cpp.zip (1.5 KB)
Thanks a lot! Feature #687 create. I’m very certain that these code will be merge can publish in the next minor version.
playBackgroundMusic() is quick in android, so I don’t implement it.
unloadBackgroundMusic, it is not included in cocos2d-iphone too. I don’t think we need this method.
On my acer liquid or other old android devices, it’s slow when run MediaPlayer.prepare(). So I modified playBackgroundMusic.
And android only have a few memory to use so I think it’s necessary to have unloadBackgroundMusic on android.
Ok, I will add the implmentation of preloadBackgroundMusic.
And android only have a few memory to use so I think it’s necessary to have unloadBackgroundMusic on android.
you can use end() to reinit the simple audio engine.