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//activity

AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);  
ComponentName receiverName = new ComponentName(getApplicationContext(), RemoteControlReceiver.class);
am.registerMediaButtonEventReceiver(receiverName);

//BroadcastReceiver

public class RemoteControlReceiver extends BroadcastReceiver
{
	@Override
	public void onReceive(Context context, Intent intent)
	{
		if (Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction()))
		{
			KeyEvent event = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
			if (KeyEvent.KEYCODE_MEDIA_PLAY == event.getKeyCode())
			{
				Toast.makeText(context, "aaaa", Toast.LENGTH_SHORT).show();
			}
		}
	}
}

//manifiest

 <receiver android:name=".RemoteControlReceiver" >
            <intent-filter>
                <action android:name="android.intent.action.MEDIA_BUTTON" />
            </intent-filter>
        </receiver>

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