Android多层级判断view是否被遮挡

（这个是好久之前已经写过的代码，纯粹再次搬过来这边分享一下。）

 之前遇到有个需求是要判断一个View是否被其他View所遮挡，即判断一个View是否在屏幕中完全显示，能完全被看到。上网搜了很多都没什么结果，然后自己研究了一下，且经过多重考虑测试，写了如下代码，希望对大家有帮助。具体看代码，不多赘述。

	public boolean isViewCovered(final View view) {
		View currentView = view;

		Rect currentViewRect = new Rect();
		boolean partVisible = currentView.getGlobalVisibleRect(currentViewRect);
		boolean totalHeightVisible = (currentViewRect.bottom - currentViewRect.top) >= view.getMeasuredHeight();
		boolean totalWidthVisible = (currentViewRect.right - currentViewRect.left) >= view.getMeasuredWidth();
		boolean totalViewVisible = partVisible && totalHeightVisible && totalWidthVisible;
		// if any part of the view is clipped by any of its parents,return true
		if (!totalViewVisible)
			return true;

		while (currentView.getParent() instanceof ViewGroup) {
			ViewGroup currentParent = (ViewGroup) currentView.getParent();
			// if the parent of view is not visible,return true
			if (currentParent.getVisibility() != View.VISIBLE)
				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 view intersects its older brother(covered),return true
				if (Rect.intersects(viewRect, otherViewRect))
					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;
	}