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    <p>Actually I can't see what can be wrong with your code so I have created small test activity.</p> <p>To test audio focus listener you have to start this activity, minimize it using "Home" button and then start some music player (tested with stock one on emulator) – you should be able to see 'Focus LOST' toast as soon as music starts playing. When you stop the music – you should see 'Focus GAINED' message.</p> <p>Also, <a href="http://android-developers.blogspot.com/2013/08/respecting-audio-focus.html?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3a%20blogspot/hsDu%20%28Android%20Developers%20Blog%29" rel="nofollow">here</a> is a good article about handling audio focus (just leaving it here for future reference) </p> <pre><code>import android.content.Context; import android.media.AudioManager; import android.os.Bundle; import android.app.Activity; import android.util.Log; import android.view.Menu; import android.widget.Toast; public class MainActivity extends Activity { private static final String TAG = MainActivity.class.getSimpleName(); private AudioManager mAudioManager; private AudioFocusChangeListenerImpl mAudioFocusChangeListener; private boolean mFocusGranted, mFocusChanged; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); mAudioFocusChangeListener = new AudioFocusChangeListenerImpl(); int result = mAudioManager.requestAudioFocus(mAudioFocusChangeListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN); switch (result) { case AudioManager.AUDIOFOCUS_REQUEST_GRANTED: mFocusGranted = true; break; case AudioManager.AUDIOFOCUS_REQUEST_FAILED: mFocusGranted = false; break; } String message = "Focus request " + (mFocusGranted ? "granted" : "failed"); Toast.makeText(this, message, Toast.LENGTH_LONG).show(); Log.i(TAG, message); } @Override protected void onDestroy() { super.onDestroy(); mAudioManager.abandonAudioFocus(mAudioFocusChangeListener); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } private class AudioFocusChangeListenerImpl implements AudioManager.OnAudioFocusChangeListener { @Override public void onAudioFocusChange(int focusChange) { mFocusChanged = true; Log.i(TAG, "Focus changed"); switch (focusChange) { case AudioManager.AUDIOFOCUS_GAIN: Log.i(TAG, "AUDIOFOCUS_GAIN"); Toast.makeText(MainActivity.this, "Focus GAINED", Toast.LENGTH_LONG).show(); break; case AudioManager.AUDIOFOCUS_LOSS: Log.i(TAG, "AUDIOFOCUS_LOSS"); Toast.makeText(MainActivity.this, "Focus LOST", Toast.LENGTH_LONG).show(); break; case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT: Log.i(TAG, "AUDIOFOCUS_LOSS_TRANSIENT"); Toast.makeText(MainActivity.this, "Focus LOST TRANSIENT", Toast.LENGTH_LONG).show(); break; case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK: Log.i(TAG, "AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK"); Toast.makeText(MainActivity.this, "Focus LOST TRANSIENT CAN DUCK", Toast.LENGTH_LONG).show(); break; } } } } </code></pre>
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