firebase - 未定义类 'FirebaseUser'

Question

我是Flutter的新手。我的 Firebase Auth / Google Auth 有问题
未定义FirebaseUser的
码:

FirebaseAuth _auth = FirebaseAuth.instance;
GoogleSignIn googleSignIn = GoogleSignIn();

Future<FirebaseUser> currentUser() async { // The Issue is here in the Future<>
  final GoogleSignInAccount account = await googleSignIn.signIn();
  final GoogleSignInAuthentication authentication =
      await account.authentication;

  final GoogleAuthCredential credential = GoogleAuthProvider.getCredential(
      idToken: authentication.idToken, accessToken: authentication.accessToken);

  final AuthResult authResult = await _auth.signInWithCredential(credential);
  final FirebaseUser user = authResult.user; // and here as I can't define this FirebaseUser object to return

  return user;
}

Pubspec.yml

dependencies:
  flutter:
    sdk: flutter


  cupertino_icons: ^0.1.3
  firebase_auth: ^0.18.0
  location: ^3.0.2
  page_transition: ^1.1.6
  google_sign_in: ^4.5.1
  flutter_facebook_login: ^3.0.0
  firebase_database: ^4.0.0

我也面临着与AuthResult相同的问题

final AuthResult authResult = await _auth.signInWithCredential(credential);

Answer 1

从firebase_auth版本0.18.0开始:
在最新版本的firebase_auth中，类FirebaseUser更改为User，而类AuthResult更改为UserCredentail。因此，将您的代码更改为以下内容:

    Future<User> currentUser() async {
      final GoogleSignInAccount account = await googleSignIn.signIn();
      final GoogleSignInAuthentication authentication =
          await account.authentication;

      final GoogleAuthCredential credential = GoogleAuthProvider.credential(
          idToken: authentication.idToken,
          accessToken: authentication.accessToken);

      final UserCredential authResult =
          await _auth.signInWithCredential(credential);
      final User user = authResult.user;

      return user;
    }

FirebaseUser更改为UserAuthResult更改为UserCredentialGoogleAuthProvider.getCredential()更改为GoogleAuthProvider.credential()
通知用户登录状态更改的onAuthStateChanged已替换为authStateChanges()currentUser()是一种检索当前登录用户的方法，已被currentUser属性取代，并且不再返回Future<FirebaseUser>。
以上两种方法的示例:

FirebaseAuth.instance.authStateChanges().listen((event) {
   print(event.email);
});

和:

var user = FirebaseAuth.instance.currentUser;
print(user.uid);

弃用UserUpdateInfo类的firebaseUser.updateProfile方法。
例:

Future updateName(String name, FirebaseUser user) async {
  var userUpdateInfo = new UserUpdateInfo();
  userUpdateInfo.displayName = name;
  await user.updateProfile(userUpdateInfo);
  await user.reload(); 
}

现在

import 'package:firebase_auth/firebase_auth.dart' as firebaseAuth;
Future updateName(String name, auth.User firebaseUser) async {
  firebaseUser.updateProfile(displayName: name);
  await firebaseUser.reload();
}