Cannot sign-in after signing out - Firebase Google Signin with Flutter - firebase

Question

I am able to sign-in and sign-out using Google. However, when I sign back in, I am not redirected to the page that I have specified. It get's stuck on the Login Page.
Here's the onPressed method for the login button:
onPressed: () async {
await Provider.of<Auth>(context, listen: false).signInWithGoogle();
},
The signInWithGoogle() method is in the Auth class below.
Here's the Auth class:
class Auth with ChangeNotifier {
String _token;
String _userId;
final FirebaseAuth _auth = FirebaseAuth.instance;
final GoogleSignIn googleSignIn = GoogleSignIn();
bool get isAuth {
return token != null;
}
String get token {
if(_token != null)
return _token;
return null;
}
String get userId {
return _userId;
}
Future<void> signInWithGoogle() async {
final GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
final GoogleSignInAuthentication googleSignInAuthentication =
await googleSignInAccount.authentication;
final AuthCredential credential = GoogleAuthProvider.credential(
accessToken: googleSignInAuthentication.accessToken,
idToken: googleSignInAuthentication.idToken,
);
final UserCredential authResult =
await _auth.signInWithCredential(credential);
final User user = authResult.user;
assert(!user.isAnonymous);
assert(await user.getIdToken() != null);
final User currentUser = _auth.currentUser;
assert(user.uid == currentUser.uid);
print('User is ' + user.displayName);
_token = await currentUser.getIdToken();
print('Token is ' + _token);
_userId = currentUser.uid;
notifyListeners();
}
Future<void> signOutGoogle() async {
await googleSignIn.signOut();
_token = null;
_userId = null;
notifyListeners();
print("User Sign Out");
}
Future<bool> tryAutoLogin() async {
//will implement later
return false;
}
}
Here's the main.dart
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MultiProvider(
providers: [
ChangeNotifierProvider(
create: (_) => Auth(),
),
ChangeNotifierProxyProvider<Auth,Categories>(
create:null,
update:(ctx,auth, previousCategories) => Categories(auth.token, auth.userId)),
],
//The consumer ensures that the material app gets built whenever Auth object changes
child: Consumer<Auth>(builder: (ctx, auth, _) =>
MaterialApp(
title: 'MyShop',
theme: ThemeData(
textTheme: Theme.of(context).textTheme.apply(
bodyColor: Colors.black,
displayColor: Colors.black,
),
primaryColor: Colors.orange,
accentColor: Colors.deepOrange,
fontFamily: 'Lato',
),
home: auth.isAuth ? CategoriesScreen()
: FutureBuilder(
future: auth.tryAutoLogin(),
builder: (ctx, authResultSnapshot) =>
authResultSnapshot.connectionState ==
ConnectionState.waiting
? SplashScreen()
: LoginPage(),
),
routes: {
CategoriesScreen.routeName: (ctx) => CategoriesScreen(),
LoginPage.routeName: (ctx) => LoginPage()
}
),
)
);
}
}
Here's the logout button:
ListTile(
leading: Icon(Icons.exit_to_app),
title: Text('Logout'),
onTap: () {
Provider.of<Auth>(context, listen:false).signOutGoogle();
Navigator.of(context).pushReplacementNamed(LoginPage.routeName);
},
),
When I sign-in for the first time, I get redirected to the CategoriesScreen() page. However, when log out and log back in, I do not get redirected.