小编T. *_*nka的帖子

我正在尝试学习如何获取Flutter应用程序以登录Firebase身份验证。我使用android studio插件创建了一个新的flutter项目，并从firebase_auth页面添加了依赖项和代码。

尝试在FirebaseAuth.instance（_auth）中调用方法时，出现错误“未为类'FirebaseAuth'定义方法'signInWithGoogle'”。这是代码：

import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:firebase_auth/firebase_auth.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning …