How to get a volume key event when the screen is locked?

Question

@Override public boolean dispatchKeyEvent(KeyEvent event) { int action = event.getAction(); int keyCode = event.getKeyCode(); switch (keyCode) { case KeyEvent.KEYCODE_VOLUME_UP: if (action == KeyEvent.ACTION_UP) { //TODO } return true; case KeyEvent.KEYCODE_VOLUME_DOWN: if (action == KeyEvent.ACTION_DOWN) { //TODO } return true; default: return super.dispatchKeyEvent(event); } } 

This code works when the screen is on. But not when the screen is locked. Is there a way to get the volume key event when the screen is locked?

Answer 1

The event is triggered only when the screen is on. Another reasonable root permission is required.

Make the BroadcastReceiver Advanced Class

  public class YourBoardcastReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Log.e("get something", "i dont know what!!"); String intentAction = intent.getAction(); KeyEvent event = null; if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) { event = (KeyEvent) intent .getParcelableExtra(Intent.EXTRA_KEY_EVENT); } if (event == null) { return; } int keycode = event.getKeyCode(); int action = event.getAction(); long eventtime = event.getEventTime(); if (keycode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE || keycode == KeyEvent.KEYCODE_HEADSETHOOK) { if (action == KeyEvent.ACTION_DOWN) { // Start your app here! // ... Log.e("event/////", "Trigerd"); if (isOrderedBroadcast()) { abortBroadcast(); } } } } } } 

And in your manifest:

 <receiver android:name="YourBoardcastReceiver"> <intent-filter> <action android:name="android.intent.action.SCREEN_ON" /> </intent-filter> </receiver> 

and call it that.

 mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE); mRemoteControlResponder = new ComponentName(getPackageName(), YourBoardcastReceiver.class.getName());