14Retained Fragments
Currently, HelloMoon does not handle rotation gracefully. Run HelloMoon, play the audio, and then rotate the device. The audio will stop abruptly.
Here is the problem: On rotation, the HelloMoonActivity is destroyed. As this is happening, the FragmentManager is responsible for destroying the HelloMoonFragment. The FragmentManager calls the fragment’s waning lifecycle methods: onPause(), onStop(), and onDestroy(). In HelloMoonFragment.onDestroy(), you release the MediaPlayer, which stops the playback.
Back in Chapter 3, you fixed a rotation-handling issue in GeoQuiz by overriding Activity.onSaveInstanceState(Bundle). You saved out the data and had the new activity read it back in. Fragment has an onSaveInstanceState(Bundle) ...
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