didChangeAppLifecycleState is not working. I have checked all other question related to this, but not helpful.

      @override
      void initState() {
WidgetsBinding.instance.addObserver(this);
super.initState();
 }


 @override
void dispose() {
WidgetsBinding.instance.removeObserver(this);
 super.dispose();
 }


@override
void didChangeAppLifecycleState(AppLifecycleState state) {
// TODO: implement didChangeAppLifecycleState
UpPrint(name: "CheckUserStatus",value: "Before");
print(state);
UpPrint(name: "CheckUserStatus",value: "After");
if (state == AppLifecycleState.resumed){
  //TODO: set status to online here in firestore
  UpPrint(name: "CheckUserStatus",value: "Online");
  UpFirebaseDB.updateUserStatus(status: true);
}else{
  //TODO: set status to offline here in firestore
  UpFirebaseDB.updateUserStatus(status: false);
  UpPrint(name: "CheckUserStatus",value: "Offline");
}
}

Note: I have used the initialRoute: ‘/’, onGenerateRoute: UpRoutes.onGenerateRoute, for page navigation and i’m using the Getx for state management.

Thank in Advanced.