相关疑难解决方法(0)

我是 Flutter 的新手。我有Firebase Auth/Google Auth 的问题FirebaseUser未定义代码：

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: …

我正在尝试在Flutter应用程序中添加Google身份验证。但是我的Android Studio无法在FirebaseAuth类下找到signInWithGoogle方法。我的意思是说我写FirebaseAuth的时候。signInWithGoogle Android Studio抱怨说未为Firebase类定义方法signInWithGoogle。

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:my_project/auth.dart';
import 'package:my_project/register.dart';
import 'package:my_project/signin/button_list.dart';
import 'package:my_project/signin/button_view.dart';
import 'package:my_project/utils.dart';
class _LoginPageState extends State<LoginPage> {
 final formKey = GlobalKey<FormState>();

// Google Sign In
final GoogleSignIn _googleSignIn = GoogleSignIn();
final FirebaseAuth _auth = FirebaseAuth.instance; // No errors so far