android 判断view 是否被遮挡

public boolean isViewCovered(final View view)
 {
         View currentView = view;
           
         Rect currentViewRect = new Rect();
         boolean partVisible =currentView.getGlobalVisibleRect(currentViewRect);
         boolean totalHeightVisible = (currentViewRect.bottom - currentViewRect.top) >= adView.getMeasuredHeight();
         boolean totalWidthVisible = (currentViewRect.right - currentViewRect.left) >= adView.getMeasuredWidth();
         boolean totalViewVisible = partVisible && totalHeightVisible && totalWidthVisible;
         if (!totalViewVisible)//if any part of the view is clipped by any of its parents,return true
                 return true;
           
         while (currentView.getParent() instanceof ViewGroup)
         {
                 ViewGroup currentParent = (ViewGroup) currentView.getParent();
                 if (currentParent.getVisibility() != View.VISIBLE)//if the parent of view is not visible,return true
                         return true;
                   
                 int start = indexOfViewInParent(currentView, currentParent);
                 for (int i = start + 1; i < currentParent.getChildCount(); i++)
                 {
                         Rect viewRect = new Rect();
                         view.getGlobalVisibleRect(viewRect);
                         View otherView = currentParent.getChildAt(i);
                         Rect otherViewRect = new Rect();
                         otherView.getGlobalVisibleRect(otherViewRect);
                         if (Rect.intersects(viewRect, otherViewRect))//if view intersects its older brother(covered),return true
                                 return true;
                 }
                 currentView = currentParent;
         }
         return false;
 }
 
 
 private int indexOfViewInParent(View view, ViewGroup parent)
 {
         int index;
         for (index = 0; index < parent.getChildCount(); index++)
         {
                 if (parent.getChildAt(index) == view)
                         break;
         }
         return index;
}