when using onwillpop, with handleAndroidBackButtonPress=false, it gives

[hadiabdullan]

[hadiabdullan]

type 'Future' is not a subtype of type '(() => Future)?' in type cast

[hadiabdullan]

when using onwillpop, with handleAndroidBackButtonPress=false, it gives type 'Future' is not a subtype of type '(() => Future)?' in type cast

[AndreSait]

Change the onWillPop to this:

onWillPop: !widget.handleAndroidBackButtonPress && widget.onWillPop != null ? () async { final result = await widget.onWillPop!(_contextList[_controller!.index]); return Future.value(result); }