Check if the user is logged in Flutter & firebase auth |

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I'm using firebase authentication to authenticate users in my Flutter app ,when the user entered his right password the app shows him the home page normally but when the password is wrong doesn't happened nothing, I want to show an alert every time the user enters a wrong password, How can I do this?

Use the currentUser() method:

if (FirebaseAuth.instance.currentUser() != null) {
    // signed in
} else {

}

How to use dynamic home page in Flutter? - Anılcan Çakır, You known, Flutter has a MaterialApp widget class to start your app. which method you using for auth system, it should have a asynchrony function for first checking. If the user is logged-in, you need to show to home page to this user. Instead check if there is user logged inside your loginScreen class you can do this a step before and then decide if you will show the loginScreen if there is no user logged or show another screen, MainScreen I’ am supposing, if the user is already logged.

That didn't work for me so this is what I did:

FirebaseAuth.instance.currentUser().then((firebaseUser){
  if(firebaseUser == null)
   {
     //signed out
   }
   else{
    //signed in
  }
});

Show login screen if not sign in : FlutterDev, I no want show home screen if user not sign in (I want show login screen). + GitHooks + GraphQL + Flutter BLoC + Dependency Injection + Linting + Testing. uninitialized — waiting to see if the user is authenticated our app will need to do is determine whether or not a user is logged in. is a Flutter widget which provides a bloc to

try this, it worked for me.

Get token from user and refresh it.

Future<bool> isUserLogged() async {   FirebaseUser firebaseUser = await getLoggedFirebaseUser();

  if (firebaseUser != null) {
    IdTokenResult tokenResult = await firebaseUser.getIdToken(refresh: true);
    return tokenResult.token != null;   } else {
    return false;   } }

Future<FirebaseUser> getLoggedFirebaseUser() {   return firebaseAuthInstance().currentUser(); }

Simple Login Flow in Flutter, then Firebase - Part One, Simple login flow in flutter using Provider for state management. Tagged with flutter, flutterio Create a Test User in Firebase. Since we are just  To verify if the user is logged in or if his token has expired, we may need to make an API call and wait for the response from the server. In this case, it makes sense to give some feedback to the

Flutter – Authentication, I'll show you later in this article how to use an authentication service to determine if the user can be authenticated or not but for now lets talk  In the basic, you can do this by using a condition on booting but if you want to check the given user to authenticated and you want to decide which page should be home for this user you need to

29 Flutter Logout & Check user authentication, Using Firebase's Cloud Firestore in Flutter If a user is already logged in, we get the user object from the Cloud Firestore service. This contains all data and The next step is to check if both the password fields match. If they  In this article, you will learn about Google Firebase Email and Google Plus Login using Flutter. Google Firebase is trending nowadays. It has around 10 sign in methods which include email, Google, Facebook, phone, Twitter, Yahoo etc. We are covering only the email and Google login options in this article. Now, we are going step by step.

Firebase User Authentication in Flutter, I have a simple game made in Flutter and I can log in the user but I don't know how to check if the user is logged and how to get user's data if so  Flutter Auth with Google. The login with Google button is very used for several apps. This is escential if you want to use authentication in your app and avoid use username and password.

Comments
  • Check if the current user is != null
  • @GünterZöchbauer Can you write all the code please
  • write your code so we can know what you are using
  • This didn't work for me, probably as currentUser returns a future, which is not null and would always make the app think the user is signed in. With await or .then can actually get the user object and not the future.
  • this answer is not correct FirebaseAuth.instance.currentUser() is async in firebase_auth plugin 0.11.0, perhaps in the past it was synchronous
  • You can always use if (await FirebaseAuth.instance.currentUser() == null)
  • Didn't work for me. Firebase user is always valid even when it's being deleted.
  • @OliverDixon I'm having exactly the same issue. Did you find any solution?
  • When answering an old question, your answer would be much more useful to other StackOverflow users if you included some context to explain how your answer helps. See: How do I write a good answer.