I am trying to understand how Gallery implements it fling behaviour.
I appreciate if someone can help me understand
1. why it needs special handing for ACTION_UP and ACTION_CANCEL?
2. why it does not check the retValue before calling UP/CANCEL's handling?
3. what does onUp() trying to do? Why it needs to send out Unpress event?
@Override
public boolean onTouchEvent(MotionEvent event) {
// Give everything to the gesture detector
boolean retValue = mGestureDetector.onTouchEvent(event);
int action = event.getAction();
if (action == MotionEvent.ACTION_UP) {
// Helper method for lifted finger
onUp();
} else if (action == MotionEvent.ACTION_CANCEL) {
onCancel();
}
return retValue;
}
/**
* Called when a touch event's action is MotionEvent.ACTION_UP.
*/
void onUp() {
if (mFlingRunnable.mScroller.isFinished()) {
scrollIntoSlots();
}
dispatchUnpress();
}
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