Flutter firebase如何使用google登录用户

dependencies:
  firebase_core: ^1.2.0
  firebase_auth: ^3.0.1

import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';

void main() async {
  // 初始化Firebase
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();

  // 设置Google登录
  final googleSignIn = GoogleSignIn();
  final googleSignInAccount = await googleSignIn.signIn();
  final googleSignInAuthentication = await googleSignInAccount.authentication;
  final credential = GoogleAuthProvider.credential(
    idToken: googleSignInAuthentication.idToken,
    accessToken: googleSignInAuthentication.accessToken,
  );

  // 使用Firebase进行登录
  final auth = FirebaseAuth.instance;
  final userCredential = await auth.signInWithCredential(credential);
  final user = userCredential.user;

  // 在此处处理登录成功后的逻辑
}