Retrieving user email from Firebase in Flutter

Question

In my AuthProvider class where I handle my sign in, sign, out authentications, I created 2 functions that returns a Future String like so

  Future<String> currentUser() async {
    FirebaseUser user = await _auth.currentUser();
    return user.uid;
  }


  Future<String> getCurrentUserEmail() async {
    FirebaseUser user = await _auth.currentUser();
    final String email = user.email.toString();
  //  print(email);
    return email;
  }

In my menu screen, I want to display my current signed in user email in a text field and I am calling it as below.

    UserAccountsDrawerHeader(
      accountName: Text('Brad Pitt'),
      accountEmail: Text(
          '${AuthProvider.of(context).auth.getCurrentUserEmail()}'),

I have tried using both the currenUser() and getCurrentUserEmail() to try to display the loggedIn user's email but I keep getting a "Instance of Future" displayed.

Is there something I'm overlooking here? I've tried every possible hack I can think of.

Thanks.

Answer 1

Since your getCurrentUserEmail returns a Future , you'll need to use a FutureBuilder to use it in your build method.

accountEmail: FutureBuilder<String>(
  future: AuthProvider.of(context).auth.getCurrentUserEmail(),
  builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
    if (snapshot.hasData) {
      return Text(snapshot.data)
    }
    else {
      return Text("Loading user data...")
    }

  }
)

Answer 2

The best thing to do is to upgrade to firebase_auth:0.18.0 , after upgrade you can get the currentUser synchronously!

dependencies:
  flutter:
    sdk: flutter
  firebase_core : ^0.5.0
  firebase_auth : ^0.18.0

initialize Firebase:

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

Then in UsersAccountDrawerHeader :

   UserAccountsDrawerHeader(
      accountName: Text('Brad Pitt'),
      accountEmail: Text('${auth.instance.currentUser.email}'),

Also check:

Undefined class 'FirebaseUser'

No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp() in Flutter and Firebase

Answer 3

You need to add ~await~ in front of the function as it's a function that returns a ~Future~

await AuthProvider.of(context).auth.getCurrentUserEmail()

Answer 4

Retrieving user email, null safety supported.

var currentUser = FirebaseAuth.instance.currentUser;


Text('admin email: ${FirebaseAuth.instance.currentUser!.email}'),