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.

Frank van Puffelen · Accepted Answer · 2020-08-21 16:27:38Z

4

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...")
    }

  }
)

edited Aug 21, 2020 at 16:27

answered Aug 21, 2020 at 15:34

Frank van Puffelen

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2 Comments

hermie_brown Over a year ago

This doesn't solve my issue either. I'm getting red and yellow scribbly lines. The error message reads: A build function returned bull.The offending widget is: FutureBuilder<String> Build functions must never return null. To return an empty space that causes the building widget to fill available room, return "Container()". To return an empty space that takes as little room as possible, return "Container(width: 0.0, height: 0.0)".

Frank van Puffelen Over a year ago

Ah, that might have been due to missing returns statements, so I updated my answer to add those. I also added a link to the documentation about FutureBuilder. I'd highly recommend you learn about that (what it is, why it's needed here, how it works), so you can troubleshoot follow-up issues yourself.

Peter Haddad · Accepted Answer · 2020-08-21 15:40:46Z

3

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

answered Aug 21, 2020 at 15:40

Peter Haddad

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4 Comments

hermie_brown Over a year ago

Thanks. Current dependencies version are firebase_core: ^0.4.5 firebase_auth: ^0.16.1 cloud_firestore: ^0.13.7 Taking on your suggestion, what version of Cloud Firestore would be compatible with the above updates to firebase_auth and firebase_core?

Peter Haddad Over a year ago

0.14.0 and core 0.5.0 as in the answer, auth 0.18.0

Peter Haddad Over a year ago

Check stackoverflow.com/questions/63473865/…

hermie_brown Over a year ago

Thanks! I appreciate. Seems I have to make app-wide changes with these new updates.

Anwar Kabir · Accepted Answer · 2022-01-18 17:35:31Z

2

Retrieving user email, null safety supported.

var currentUser = FirebaseAuth.instance.currentUser;


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

answered Jan 18, 2022 at 17:35

Anwar Kabir

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Comments

ByteMe · Accepted Answer · 2020-08-21 15:34:49Z

1

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()

answered Aug 21, 2020 at 15:34

ByteMe

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1 Comment

hermie_brown Over a year ago

I can't call this in my build method. it would throw an error and force me to declare my default build function as a Future and adds async to it.

Kanu mike · Accepted Answer · 2022-11-09 19:31:17Z

0

After initilizing your Firebase in your main

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

Now in the Text widget to display the current user's email use

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

answered Nov 9, 2022 at 19:31

Kanu mike

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