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:

  if(firebaseUser == null)
     //signed out
    //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(); }

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  • 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.