auth_package 是一个用于 Flutter 应用的身份验证管理的插件，它简化了用户身份验证的流程，包括登录、注册、密码重置等功能。以下是如何在 Flutter 项目中使用 auth_package 的基本步骤。

1. 添加依赖

首先，在你的 pubspec.yaml 文件中添加 auth_package 依赖：

dependencies:
  flutter:
    sdk: flutter
  auth_package: ^1.0.0  # 请使用最新版本

然后运行 flutter pub get 来安装依赖。

2. 初始化 AuthPackage

在你的 Flutter 应用的 main.dart 文件中，初始化 AuthPackage：

import 'package:flutter/material.dart';
import 'package:auth_package/auth_package.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Auth Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: AuthPackage(
        child: HomeScreen(),
        authConfig: AuthConfig(
          apiKey: 'YOUR_API_KEY',
          authDomain: 'YOUR_AUTH_DOMAIN',
          projectId: 'YOUR_PROJECT_ID',
          storageBucket: 'YOUR_STORAGE_BUCKET',
          messagingSenderId: 'YOUR_MESSAGING_SENDER_ID',
          appId: 'YOUR_APP_ID',
        ),
      ),
    );
  }
}

AuthConfig 中的参数需要根据你的 Firebase 项目配置进行填写。

3. 使用 AuthPackage 进行身份验证

在你的应用中使用 AuthPackage 提供的功能进行身份验证。以下是一些常见的操作：

登录

import 'package:flutter/material.dart';
import 'package:auth_package/auth_package.dart';

class LoginScreen extends StatelessWidget {
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Login'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            TextField(
              controller: _emailController,
              decoration: InputDecoration(labelText: 'Email'),
            ),
            TextField(
              controller: _passwordController,
              decoration: InputDecoration(labelText: 'Password'),
              obscureText: true,
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: () async {
                try {
                  await AuthPackage.signInWithEmailAndPassword(
                    _emailController.text,
                    _passwordController.text,
                  );
                  Navigator.pushReplacementNamed(context, '/home');
                } catch (e) {
                  print('Login failed: $e');
                }
              },
              child: Text('Login'),
            ),
          ],
        ),
      ),
    );
  }
}

注册

import 'package:flutter/material.dart';
import 'package:auth_package/auth_package.dart';

class RegisterScreen extends StatelessWidget {
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Register'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            TextField(
              controller: _emailController,
              decoration: InputDecoration(labelText: 'Email'),
            ),
            TextField(
              controller: _passwordController,
              decoration: InputDecoration(labelText: 'Password'),
              obscureText: true,
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: () async {
                try {
                  await AuthPackage.createUserWithEmailAndPassword(
                    _emailController.text,
                    _passwordController.text,
                  );
                  Navigator.pushReplacementNamed(context, '/home');
                } catch (e) {
                  print('Registration failed: $e');
                }
              },
              child: Text('Register'),
            ),
          ],
        ),
      ),
    );
  }
}

密码重置

import 'package:flutter/material.dart';
import 'package:auth_package/auth_package.dart';

class ForgotPasswordScreen extends StatelessWidget {
  final _emailController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Forgot Password'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            TextField(
              controller: _emailController,
              decoration: InputDecoration(labelText: 'Email'),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: () async {
                try {
                  await AuthPackage.sendPasswordResetEmail(_emailController.text);
                  ScaffoldMessenger.of(context).showSnackBar(
                    SnackBar(content: Text('Password reset email sent')),
                  );
                } catch (e) {
                  print('Password reset failed: $e');
                }
              },
              child: Text('Send Reset Email'),
            ),
          ],
        ),
      ),
    );
  }
}

4. 监听用户状态

你可以在应用的任何地方监听用户的状态变化，例如用户登录或注销：

import 'package:flutter/material.dart';
import 'package:auth_package/auth_package.dart';

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: StreamBuilder<User?>(
          stream: AuthPackage.userStream,
          builder: (context, snapshot) {
            if (snapshot.connectionState == ConnectionState.waiting) {
              return CircularProgressIndicator();
            } else if (snapshot.hasData) {
              return Text('Welcome, ${snapshot.data!.email}');
            } else {
              return Text('You are not logged in');
            }
          },
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () async {
          await AuthPackage.signOut();
        },
        child: Icon(Icons.logout),
      ),
    );
  }
}

5. 处理用户注销

用户注销可以使用 AuthPackage.signOut() 方法：

await AuthPackage.signOut();