Flutter when I hot reload or close the app it does not keep the user logged in

Question

Hi I have spent a couple of days on trying to figure out why my user looses there "session" on my app when I close the app. How do I keep them signed in or what might cause this?

I am running the app on my google pixel 5 using the simulator option on android studio.

yaml file:

firebase_core: ^0.4.0+9
firebase_auth: ^0.14.0+9
cloud_firestore: ^0.13.6
firebase_storage: 3.1.6
firebase_messaging: 6.0.16
firebase_crashlytics: 0.1.4+1

This is what I can see in my logs (Not helpful much):

D/FlutterLocationService(32338): Unbinding from location service. D/FlutterLocationService(32338): Destroying service. D/FlutterLocationService(32338): Creating service. D/FlutterLocationService(32338): Binding to location service.

flutter doctor -v:

(base) darrendupreez@Darrens-MacBook-Pro unavine_app % flutter doctor -v [✓] Flutter (Channel dev, 1.26.0-12.0.pre, on macOS 11.1 20C69 darwin-x64, locale en-CA) • Flutter version 1.26.0-12.0.pre at /Applications/flutter • Framework revision a706cd2112 (2 weeks ago), 2021-01-14 18:20:26 -0500 • Engine revision effb529ece • Dart version 2.12.0 (build 2.12.0-224.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3) • Android SDK at /Users/darrendupreez/Library/Android/sdk • Platform android-30, build-tools 30.0.3 • Java binary at: /Users/darrendupreez/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/201.7042882/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495) • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS • Xcode at /Applications/Xcode.app/Contents/Developer • Xcode 12.4, Build version 12D4e • CocoaPods version 1.10.1

[✓] Android Studio (version 4.1) • Android Studio at /Users/darrendupreez/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/201.7042882/Android Studio.app/Contents • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] Connected device (1 available) • Pixel 5 (mobile) • 0C161FDD4000DT • android-arm64 • Android 11 (API 30)

• No issues found!

Answer 1

You can use shared_preferences: ^0.5.12+4 to save the session.Just check whether it is null or not. And when you need you can update the data with new login.

Sample:

SharedPreferences prefs = await SharedPreferences.getInstance(); int counter = (prefs.getInt('counter') ?? 0) + 1; print('Pressed $counter times.');

Answer 2

Providers and AuthCreditental should work here is an example for google login with firebase

main.dart

   class MyApp extends StatelessWidget {
      // This widget is the root of your application.
      @override
      Widget build(BuildContext context) {
        return Provider(
          create: (context) => AuthBloc(),
          child: MaterialApp(
            title: 'Your App',
            debugShowCheckedModeBanner: false,
            theme: ThemeData(
              primarySwatch: MaterialColor(0xff360A36, color),
              accentColor: Colors.limeAccent,
            ),
            //darkTheme: ThemeData.dark(),
            home: LogInPage(),
          ),
        );
      }

}

auth_bloc.dart

class AuthBloc {
  final authService = AuthService();
  final googleSignin = GoogleSignIn(scopes: ['email']);

  Stream<User> get currentUser => authService.currentUser;

  loginGoogle() async {
    try {
      final GoogleSignInAccount googleUser = await googleSignin.signIn();
      final GoogleSignInAuthentication googleAuth =
          await googleUser.authentication;
      final AuthCredential credential = GoogleAuthProvider.credential(
          idToken: googleAuth.idToken, accessToken: googleAuth.accessToken);

      //Firebase Sign in
      final result = await authService.signInWithCredential(credential);
      print('${result.user.displayName}');
    } catch (error) {
      print(error);
    }
  }


  logout() {
    authService.logout();
    googleSignin.signOut();
  }

sign in button

  SignInButton(
            Buttons.Google,
            text: "Sign in with Google",
            onPressed: () => authBloc.loginGoogle(),
          ),

Also you can watch this tutorial for using credentials and providers

https://www.youtube.com/watch?v=_uYO2ht5Nl4&list=PL19w2HZFNl2BsftambzhFE7tVrqGEVwzy&index=1&t=1924s