Android Programming: The Big Nerd Ranch Guide, Third Edition

Rotation and Object Continuity

Now you are a good citizen, which is nice. Unfortunately, your app no longer handles rotation correctly. Try playing the 69_ohm-loko sound and rotating the screen: The sound will stop abruptly. (If it does not, make sure you have built and run the app with your recent onDestroy() implementation.)

Here is the problem: On rotation, the BeatBoxActivity is destroyed. As this happens, the FragmentManager destroys your BeatBoxFragment, too. In doing that, it calls BeatBoxFragment’s waning lifecycle methods: onPause(), onStop(), and onDestroy(). In BeatBoxFragment.onDestroy(), you call BeatBox.release(), which releases the SoundPool and stops sound playback.

You have seen how Activity and Fragment instances ...