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.

转自：http://blog.csdn.net/catherine880619/article/details/7062533

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