Android中在OnCreate时获得控件高度

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

		    }
		});