Example of setting an onPreDrawListener on a view

onPreDrawExample

final View view = findViewById(R.id.view_id);
        view.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                view.getViewTreeObserver().removeOnPreDrawListener(this);
                //Do the things you want to do. Return true if you want to draw that frame, otherwise return false
                return false;
            }
        });

Could you write its explanation that why is it used?

Could you write its explanation that why is it used?

It will be used to draw the children of a view group related to its parent width and height.