本文介绍了Android中ViewGroup的descendantFocusability属性，该属性定义了ViewGroup与其子视图之间的焦点交互方式。主要包括beforeDescendants（ViewGroup优先于子视图获取焦点）、afterDescendants（仅当子视图不需要焦点时ViewGroup才获取焦点）和blocksDescendants（阻止子视图接收焦点）三种模式。
<!-- Defines the relationship between the ViewGroup and its descendants
when looking for a View to take focus. -->
<attr name="descendantFocusability">
<!-- The ViewGroup will get focus before any of its descendants. -->
<enum name="beforeDescendants" value="0" />
<!-- The ViewGroup will get focus only if none of its descendants want it. -->
<enum name="afterDescendants" value="1" />
<!-- The ViewGroup will block its descendants receiving focus. -->
<enum name="blocksDescendants" value="2" />
</attr>
when looking for a View to take focus. -->
<attr name="descendantFocusability">
<!-- The ViewGroup will get focus before any of its descendants. -->
<enum name="beforeDescendants" value="0" />
<!-- The ViewGroup will get focus only if none of its descendants want it. -->
<enum name="afterDescendants" value="1" />
<!-- The ViewGroup will block its descendants receiving focus. -->
<enum name="blocksDescendants" value="2" />
</attr>
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