I’m working on an Android app where I need to wake up the device screen when an alarm is triggered. Previously, I used PowerManager.FULL_WAKE_LOCK to achieve this, but it has been deprecated.

I found this approach but I need to extend Activity to use the getWindow(), so while my AlarmReceiver extends BroadcastReceiver it doesnt work.

getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

What I’ve Tried:

• Using context in onReceive to call the getWindow but it doesnt work.

  public void onReceive(Context context, Intent intent) {

   int eventId = intent.getIntExtra("eventId",0);
   String comments = intent.getStringExtra("comments");
   String alarm_title = context.getString(R.string.app_name);
  
   NOTIFICATION_ID = eventId;
   context.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
   context.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
   context.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
   context.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
  

• Starting a new activity with the flags set, but the activity does
  not run the code.

  Intent activityIntent = new Intent(context, AlarmActivity.class);
  activityIntent.putExtra(“eventId”, eventId);
  activityIntent.putExtra(“comments”, comments);
  activityIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
  context.startActivity(activityIntent);

  public class WakeScreenActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

       // Set flags to wake up the screen
       getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
               | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
               | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
               | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
  
       // Optionally, you can set a layout for this activity
       setContentView(R.layout.activity_wake_screen);
  
       // Finish the activity after some time or based on your needs
       // This example finishes it after 5 seconds
       new Handler().postDelayed(this::finish, 5000);
   }
  

  }

• Setting as fullscreenintent an intent that has the above code inside.

  private PendingIntent createFullScreenIntent(Context context, int eventId, String comments) {
  Intent fullScreenIntent = new Intent(context, WakeScreenActivity.class);
  fullScreenIntent.putExtra(“eventId”, eventId);
  fullScreenIntent.putExtra(“comments”, comments);
  return PendingIntent.getActivity(context, 0, fullScreenIntent, PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);
  }

What is the recommended approach for waking up the screen and ensuring it is visible when an alarm is triggered, given the deprecation of PowerManager.FULL_WAKE_LOCK?

Target SDK version: 34
Minimum SDK version: 21