CODEWITHSUNDEEP
androidandroid-viewtouch-eventandroid-windowmanagerlayoutparams
Tushar Gopale
Tushar Gopale

Reputation: 1

Missing touch events in android for view with height and width 0. OnTouchListener does not invoke onTouch()

I have one ActivityMonitor class and in which I have attachTouchDetectorView() methos as below:

private void attachTouchDetectorView(Activity activity) {
    WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams(0, 0, 0, 0, TYPE_APPLICATION, FLAG_NOT_FOCUSABLE|FLAG_NOT_TOUCH_MODAL|FLAG_WATCH_OUTSIDE_TOUCH, TRANSLUCENT);
    WindowManager windowManager = activity.getWindowManager();
    View view = new View(activity);
        
        //set listener
    view.setOnTouchListener(new TouchNotifier());
    windowManager.addView(view, layoutParams);
}

This method creates a view and set touch listener TouchNotifier as below:

private class TouchNotifier implements View.OnTouchListener {
  @Override
  public boolean onTouch(View view, MotionEvent motionEvent) {
      // do your task
          // Log.d("Touch event received");
      return false;
  }
}

When I am on android 9, I am getting all touch events for my activity and log "Touch event received" getting print, but same is not the case with android 12.

I tried to change WindowManager.LayoutParams from

WindowManager.LayoutParams(0, 0, 0, 0, TYPE_APPLICATION, FLAG_NOT_FOCUSABLE|FLAG_NOT_TOUCH_MODAL|FLAG_WATCH_OUTSIDE_TOUCH, TRANSLUCENT)

To

WindowManager.LayoutParams(100, 100, 0, 0, TYPE_APPLICATION, FLAG_NOT_FOCUSABLE|FLAG_NOT_TOUCH_MODAL|FLAG_WATCH_OUTSIDE_TOUCH, TRANSLUCENT)

note the height and width has been changed to 100 x 100. This change worked and touch events are started working on android 12. My question is why zero height and width view was working on android 9 and not working on android 12? I could not find any change documented by google. Please help to identify the reason for this behavior change from 9 to 12.

Upvotes: 0

Views: 18

Answers (0)

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