javascript - Android How to detect double tap? -

i'm trying refresh canvas on doubletap in android. use gesturedetector in custom view.

final gesturedetector mdetector = new gesturedetector(     getcontext(), new gesturedetector.ongesturelistener() {      @override     public boolean ondoubletap(motionevent e) {         invalidate();         return true;     } } 

but i'm getting error

the method ondoubletap(motionevent) of type new gesturedetector.ongesturelistener(){} must override or implement supertype method

with

remove '@override' annotation 

solution. remove override , warning

the method ondoubletap(motionevent) type new gesturedetector.ongesturelistener() {} never used locally.

then tried test whether works , made function change textview string whenever doubletap. nothing happens.

i looked @ gesturedetector reference explanations, don't have doubletap there, uses. should do?

try this

final gesturedetector mdetector = new gesturedetector(getcontext(), new gesturedetector.simpleongesturelistener {      @override     public boolean ondown(motionevent e) {          return true;     }      @override     public boolean ondoubletap(motionevent e) {          return true;     } });