Question

In Android, When I press back/home button the music stops (that’s fine), but when I re-enter to the activity I want to begin/resume playing back the music.

How does Android manage playback of audio when the program goes into the background?

Answer 1

Ordinarily, you should include a lot more details and code about your problem, but I just happened to see your other post on a related matter.

You need the following in onResume(). Note, if you are doing mp.start() in onCreate(), you can remove that start as onResume() is called after onCreate().

@Override
protected void onResume() {
    if(mp != null && !mp.isPlaying())
        mp.start();
    super.onResume();
}

start() from MeidaPlayer will start over if stop or never played, or from where paused if it was paused.