i'm using the GestureDetector and GestureListener in a program. i want
to have separate actions for the onFling and onScroll events. for a
"scroll" event there is no problem - only the onScroll event is
called. however for a "fling" event BOTH the onFling and onScroll
events are being called. i tried returning "true" in the onFling
method to prevent further propagation of the event but that didnt
help. following is the code excerpt from the onTouchEvent and the
related gesture events:
private static boolean fling, scroll; //two boolean values to detect
whether the performed action is a fling or scroll
private GestureDetector scanner; //this is the gesture detector
public boolean onTouchEvent(MotionEvent me){
fling = false;
scroll = false;
scanner.onTouchEvent(me);
if (fling) {
scroll = false;
return true;
} else if (scroll){
return true;
}
return super.onTouchEvent(me);
}
public boolean onFling(MotionEvent e1, MotionEvent e2, float
velocityX,
float velocityY) {
fling = true;
return false; //changing this to return true at this point
makes no
difference
}
public boolean onScroll(MotionEvent e1, MotionEvent e2, float
distanceX,
float distanceY) {
scroll = true;
return false;
}
what i tried in the onTouchEvent method above is to put a kind of a
"lock" so that if a "fling" is detected then the appropriate action is
taken and the event is not propagated further. however despite trying
every combination of returning true / false in each of the above
methods, i am unable to separate out the "fling" event from the
"scroll" event.
as i said - there is no problem in the conventional scroll - in this
case only the action for scroll is being performed.
for the gesture events, is there any particular sequence in which the
event is propagated? i.e. does it first go to the onClick, then the
onFling, then the onScroll ... etc?
any inputs will be greatly appreciated
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