Overridding Method for 'OK" button
<p>I've created a simple Activity class for an audio example. But the problem is the the audio file keeps running even if I leave the app. I just want to stop the ACTIVITY by pressing the 'OK/DONE" button in middle of any phone. Which method should I override in the activity class?</p>

<pre><code>public class Audio extends Activity {

    private MediaPlayer mp;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    setVolumeControlStream(AudioManager.STREAM_MUSIC);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_audio, menu);
    return true;
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    int resId;
    switch (keyCode) {
    case KeyEvent.KEYCODE_DPAD_UP:
    resId = R.raw.up;
    break;
    case KeyEvent.KEYCODE_DPAD_DOWN:
    resId = R.raw.down;
    break;

    default:
        return super.onKeyDown(keyCode, event);
    }

    // Release any resources from previous MediaPlayer
    if (mp != null) {
        mp.release();
        }

    // Create a new MediaPlayer to play this sound
    mp = MediaPlayer.create(this, resId);
    mp.start();

    // Indicate this key was handled
    return true;


}

}/// end class
</code></pre>
