AndroidにおけるonIntercept TouchEventとonTouchEventの呼び出しタイミング

      viewGroup           ，     API     ，      ，      ，                     ，              ！

    ：http://www.blogjava.net/TiGERTiAN/archive/2011/02/22/344869.html

onInterceptTouchEvent() ViewGroup     ，        ViewGroup    childView  onTouchEvent()             ，Android            ，  ViewGroup     childView,            touch     ，          view           ， LinearLayout  ，TextView   。 

onInterceptTouchEvent()      ，   ViewGroup       ，        touch      。      ，     touch              ，touch   onInterceptTouchEvent() onTouchEvent    childView           onInterceptTouchEvent() onTouchEvent()    。  ，  down               move up        。 

        ，       ，  return true,              ，  return false，             ，                      。

SDK       ：

·You will receive the down event here.

·The down event will be handled either by a child of this view group, or given to your own onTouchEvent() method to handle; this means you should implement onTouchEvent() to return true, so you will continue to see the rest of the gesture (instead of looking for a parent view to handle it). Also, by returning true from onTouchEvent(), you will not receive any following events in onInterceptTouchEvent() and all touch processing must happen in onTouchEvent() like normal.

·For as long as you return false from this function, each following event (up to and including the final up) will be delivered first here and then to the target's onTouchEvent().

·If you return true from here, you will not receive any following events: the target view will receive the same event but with the action ACTION_CANCEL, and all further events will be delivered to your onTouchEvent() method and no longer appear here.

  onInterceptTouchEvent()       ，            ，    ，      ：

1. down        onInterceptTouchEvent()  

2.    ViewGroup onInterceptTouchEvent()    down        return false，     move, up            ViewGroup，    down            view onTouchEvent()  。

3.    ViewGroup onInterceptTouchEvent()    down        return true，     move, up         onInterceptTouchEvent()，   down        ViewGroup onTouchEvent()  ，  ，  view         。

4.            view onTouchEvent()   false，                view onTouchEvent()  。

5.            view  onTouchEvent()   true，               view onTouchEvent()  。