If I call getMeasuredWidth() or getWidth() for layout in onResume they return 0

Question

If I call getMeasuredWidth() or getWidth() for layout in onResume they returns 0. I think that view it\'s not drawn yet in this moment.

Also I think that I need to

Answer 1

This answer says:

Use the ViewTreeObserver on the View to wait for the first layout. Only after the first layout will getWidth()/getHeight()/getMeasuredWidth()/getMeasuredHeight() work.

ViewTreeObserver viewTreeObserver = view.getViewTreeObserver();
if (viewTreeObserver.isAlive()) {
  viewTreeObserver.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
      view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
      viewWidth = mediaGallery.getWidth();
      viewHeight = mediaGallery.getHeight();
    }
  });
}