Remove gestures from Android Q

Question

I have a kids drawing app, but the gestures in Q keep quitting the app. I tried removing the system gesture but it does not seem to work.

In this case, I am trying to exclude the whole screen from system gesture:

List<Rect> exclusionRects = new ArrayList();

public void onLayout(boolean changedCanvas, int left, int top, int right, int bottom) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
        exclusionRects.clear();
        exclusionRects.add(new Rect(left, top, right, bottom));
        setSystemGestureExclusionRects(exclusionRects);
    }
}

Answer 1

As stated by Google:

First, to ensure reliable and consistent operation, there’s a 200dp vertical app exclusion limit for the Back gesture.

https://android-developers.googleblog.com/2019/08/final-beta-update-official-android-q.html

This means that the operating system will not allow you to override the back gesture fully.

This makes sense as it is a fairly fundamental part of the operating system and they probably don't want to allow apps that remove the gesture entirely, as it is bad for consistency across the platform