ViewTreeObserver vto = mArrowUp.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
          mArrowUp.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            Log.e("Width",Integer.toString(mArrowUp.getWidth()));
            


        }
    });