MediaPlayer issues - audio file only plays back once - android-mediaplayer

Question

I'm trying to implement a basic MediaPlayer in an app, and have the button change states depending on whether the clip is playing, playback is completed, or playback is manually interrupted (by pressing the same button).
With the code below, I get the following results:
On first load, the audio plays back fine.
If I press the ImageButton a second time during playback, the playback stops. When I press it again, the playback resumes from the timestamp in which it was stopped (I thought this was strange behaviour more typical of a "pause()".
Once the playback is completed, the button change works perfectly, however I can not replay the audio file a second time. When I press start, it starts playing back, then immediately transitions to playbackcompleted, without actually playing the audio.
I've been scouring through other posts / google / android documentation, but haven't found a solution as yet.
I have also tried so far:
setLooping(true); - this had no effect at all, other than the setOnCompletionListener never being reached. The audio did not replay at all.
In the onCompletion method, setting the seekTo() to several different values (0, 100), and using log messages including the "getCurrentPosition()" to confirm it was actually doing it, but even when this confirms that it's starting from position 0, or 100, the result is still the same (no audio is heard and completion occurs immediately).
In the onCompletion method, several combinations of calling "stop()", "prepareAsync()" or even prepare(). The results were the same, however on subsequent attempts (i.e. attempt 2, 3, etc) to playback, when the onCompletion method was called, I started getting various errors for calling stop() / prepare() methods in the incorrect state.
final ImageButton pauseButton = (ImageButton) rootView.findViewById(R.id.playButton1);
final MediaPlayer mediaPlayer = MediaPlayer.create(getActivity().getApplicationContext(), R.raw.ch01_01);
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mp) {
pauseButton.setImageResource(R.drawable.play_button);
}
});
pauseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(mediaPlayer.isPlaying()) {
mediaPlayer.stop();
mediaPlayer.prepareAsync();
pauseButton.setImageResource(R.drawable.play_button);
} else {
mediaPlayer.start();
pauseButton.setImageResource(R.drawable.stop_button);
}
}
});
Any help would be appreciated!
P.S. I'm using all of this code in the onCreateView method for a Fragment in my application. Just in case anyone thinks that might be relevant.

Answer 1

Apparently this issue is simply my Samsung Galaxy S2, as the same code works perfectly as expected on my Nexus 7 (2013) running Lollipop 5.0.1.
The issue on the Galaxy S2 includes the following:
Once an MediaPlayer is in the PlaybackCompleted state, it will not play the same file a second time when play is pressed
Attempting to run Methods in the PlaybackCompleted state (which should be valid according to Android documentation) seem to do something (i.e. seekTo(0); will actually seek to 0, but the audio file will never play a second time.