android:descendantFocusability 焦点父控件与子控件焦点

最新推荐文章于 2025-12-01 09:19:47 发布

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本文深入探讨了Android中descendantFocusability属性的作用，解释了焦点父控件与子控件之间的关系，并详细说明了beforeDescendants、afterDescendants和blocksDescendants三种常量值的具体应用。

android:descendantFocusability 焦点父控件与子控件焦点

android:descendantFocusability
Defines the relationship between the ViewGroup and its descendants when looking for a View to take focus.
Must be one of the following constant values.
Constant Value Description
beforeDescendants 0 The ViewGroup will get focus before any of its descendants.
afterDescendants 1 The ViewGroup will get focus only if none of its descendants want it.
blocksDescendants 2 The ViewGroup will block its descendants from receiving focus