User not able to sign out in firebase Flutter application - firebase

Question

D/FirebaseAuth( 7994): Notifying id token listeners about a sign-out event.
D/FirebaseAuth( 7994): Notifying auth state listeners about a sign-out event.
class LandingPage extends StatefulWidget {
#override
_LandingPageState createState() => _LandingPageState();
}
class _LandingPageState extends State<LandingPage> {
User _user;
#override
void initState() {
super.initState();
_updateUser(FirebaseAuth.instance.currentUser);
}
void _updateUser(User user) {
setState(() {
_user = user;
});
}
#override
Widget build(BuildContext context) {
if (_user == null) {
return SignInPage(
onSignIn: _updateUser,
);
}
return HomePage(
onSignOut: () => _updateUser(null),
);
}
}
Home page Code:-
class HomePage extends StatelessWidget {
HomePage({#required this.onSignOut});
final VoidCallback onSignOut;
Future<void> _signOut() async {
try {
await FirebaseAuth.instance.signOut();
} catch (e) {
print(e.toString()) ;
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Home Page'),
actions: <Widget>[
FlatButton(
child: Text(
'Logout',
style: TextStyle(
fontSize: 18.0,
color: Colors.white,
),
),
onPressed: _signOut,
),
],
),
);
}
}
this is my code but the user is not able to log out of my application.Can somebody tell me what to fix

Answer 1

Try to await the signout call:
class HomePage extends StatelessWidget {
HomePage({#required this.onSignOut});
final VoidCallback onSignOut;
Future<void> _signOut() async {
try {
await FirebaseAuth.instance.signOut();
} catch (e) {
print(e.toString()) ;
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Home Page'),
actions: <Widget>[
FlatButton(
child: Text(
'Logout',
style: TextStyle(
fontSize: 18.0,
color: Colors.white,
),
),
onPressed: () async => await _signOut(), // Updated code
),
],
),
);
}
}