android--Touch Events 你应该记住的一些事

The 

onInterceptTouchEvent()

 method
is called whenever a touch event is detected on the surface of a 

ViewGroup

,
including on the surface of its children. If 

onInterceptTouchEvent()

 returns 

true

,
the 

MotionEvent 

is
intercepted, meaning it will be not be passed on to the child, but rather to the 

onTouchEvent()

 method
of the parent.

The 

onInterceptTouchEvent()

 method
gives a parent the chance to see any touch event before its children do. If you return 

true

 from 

onInterceptTouchEvent()

,
the child view that was previously handling touch events receives an

ACTION_CANCEL

,
and the events from that point forward are sent to the parent's 

onTouchEvent()

 method
for the usual handling. 

onInterceptTouchEvent()

 can
also return 

false

 and simply spy on events as they travel down the view hierarchy to their usual targets, which will handle the events with their own 

onTouchEvent()

.

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