Detecting Android screen overlays programmatically

Question

Is there a way for an app to:

1. check if there exists screen overlay(s) on top of it, and
2. figure out what package name owns the overlay(s)?

I

Answer 1

You can detect overlays by checking for the MotionEvent.FLAG_WINDOW_IS_OBSCURED flag when the user touches one of your Views.

final View.OnTouchListener filterTouchListener = new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        // Filter obscured touches by consuming them.
        if ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) {
            if (event.getAction() == MotionEvent.ACTION_UP) {
                Toast.makeText(v.getContext(), "Overlay detected", Toast.LENGTH_SHORT).show();
            }
            return true;
        }
        return false;
    }
};

yourButton.setOnTouchListener(filterTouchListener);

Source: Android M's settings app

However, I don't think it's possible to detect which app owns the overlay.