android 重叠布局

FrameLayout:该布局container可以用来占有屏幕的某块区域来显示单一的对象,可以包含有多个widgets或者是container,但是所有被包含的widgets或者是container必须被固定到屏幕的左上角,并且一层覆盖一层,不能通过为一个widgets或者是container指定一个位置。Container所包含的widgets或者是container的队列是采用的堆栈的结构,最后加进来的widgets或者是container显示在最上面。所以后一个widgets或者是container将会直接覆盖在前一个widgets或者是container之上,把它们部份或全部挡住(除非后一个widgets或者是container是透明的,必须得到FrameLayout Container的允许)。

ViewGroup是View的子类,所以它也具有View的特性,但它主要用来充当View的容器,将其中的View视作自己的孩子,对它的子View进行管理,当然它的孩子也可以是ViewGroup类型。
ViewGroup(树根)和它的孩子们(View和ViewGroup)以树形结构形成了一个层次结构,View类有接受和处理消息的功能,android系统所产生的消息会在这些ViewGroup和 View之间传递。

Android的View和ViewGroup分析(转载)

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