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copied!<p>You need to pay more attention to the <code>MediaPlayer</code>'s <a href="http://developer.android.com/reference/android/media/MediaPlayer.html" rel="nofollow">state machine</a> and design your interaction with it more carefully around that. To be specific, you cannot call <code>release</code> in the completion callback and expect to be able to use the same <code>MediaPlayer</code> again.</p> <p>You can instead call <code>reset</code> in the completion callback and go through the code you have in <code>initializeMediaPlayer</code> again. Or alternatively, you can try seeking to zero to avoid re-preparing the source (although preparing a local file is negligible in terms of performance).</p> <p>Edit: About your <code>MediaController</code> problem... it can be a bit wonky in the emulator. I have a few suggestions.</p> <p>1) Basically never use <code>getApplicationContext()</code>, especially not from inside an <code>Activity</code> (which already is a <code>Context</code>). (This probably doesn't help get the controller to show, but is just a general tip.)</p> <p>2) You are passing <code>R.layout.activity_main</code> to <code>findViewById</code>. I don't think that's correct. It should be <code>R.id.___</code> for the ID of a view defined inside the layout. You can define the IDs with the <code>android:id</code> tag in the layout XML.</p> <p>3) I could not get the controller to show when passing the ID of an empty <code>LinearLayout</code>. If you want to use a layout, you may need to put some kind of view inside it. I put a <code>TextView</code> inside it and viola, I had a controller. It doesn't show for long, so pay attention. There may be a parameter to set for the display timeout.</p>

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