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This Android Tutorial shows an example of onTouchEvent with the help of a custom ViewGroup and a custom View. The Activity forwards the ACTION_DOWN MotionEvent through its dispatchTouchEvent where we call the super implementation to forward this event to the custom ViewGroup's dispatchTouchEvent. Here we can forward this to onInterceptedTouchEvent to decide whether we want to process the MotionEvent here in the ViewGroup or pass the event to the children of this ViewGroup. If we return false here, it means let the children process the event and hence the dispatchTouchEvent is called for the children where the onTouchEvent will be triggered. if the View returns true , it means the View is interested in consuming the event thus breaking the cycle, otherwise the parents are given a chance to process the same event bubbling up from the child inside their onTouchEvent respectively. The last call is to the Activity's onTouchEvent after which the event is lost if none of them are willing to process it. By default, all of them return false in their super implementation.
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232 Android onTouchEvent Part 2 | | |
| 26,153 views views | 149,094 followers |
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| Education | Upload TimePublished on 7 Jan 2015 |
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