设置viewgroup和子类控件获取焦点的优先级

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xml设置：android:descendantFocusability="blocksDescendants"    //afterDescendants beforeDescendants
java代码设置：ViewGroup.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
//FOCUS_BLOCK_DESCENDANTS FOCUS_BEFORE_DESCENDANTS
默认值：FOCUS_BEFORE_DESCENDANTS

beforeDescendants：viewgroup会优先其子类控件而获取到焦点

afterDescendants：viewgroup只有当其子类控件不需要获取焦点时才获取焦点

blocksDescendants：viewgroup会覆盖子类控件而直接获得焦点

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