tek_loyalty_service_flutter 是一个用于处理忠诚度服务的 Flutter 插件。它可以帮助开发者在 Flutter 应用中集成忠诚度计划的功能，如积分管理、奖励兑换、用户等级等。以下是如何使用 tek_loyalty_service_flutter 插件的详细步骤。

1. 添加依赖

首先，你需要在 pubspec.yaml 文件中添加 tek_loyalty_service_flutter 插件的依赖。

dependencies:
  flutter:
    sdk: flutter
  tek_loyalty_service_flutter: ^1.0.0  # 请使用最新的版本号

然后运行 flutter pub get 来安装依赖。

2. 初始化插件

在 main.dart 文件中，初始化 tek_loyalty_service_flutter 插件。

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

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  // 初始化插件
  await TekLoyaltyServiceFlutter.initialize(
    apiKey: 'YOUR_API_KEY',
    baseUrl: 'https://your-loyalty-service-api.com',
  );

  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Loyalty Service Demo',
      home: LoyaltyHomePage(),
    );
  }
}

3. 使用插件功能

在 LoyaltyHomePage 中，你可以使用插件提供的功能，如获取用户积分、兑换奖励等。

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

class LoyaltyHomePage extends StatefulWidget {
  @override
  _LoyaltyHomePageState createState() => _LoyaltyHomePageState();
}

class _LoyaltyHomePageState extends State<LoyaltyHomePage> {
  int _points = 0;
  String _rewardStatus = '';

  @override
  void initState() {
    super.initState();
    _fetchUserPoints();
  }

  Future<void> _fetchUserPoints() async {
    try {
      final points = await TekLoyaltyServiceFlutter.getUserPoints(userId: 'USER_ID');
      setState(() {
        _points = points;
      });
    } catch (e) {
      print('Failed to fetch user points: $e');
    }
  }

  Future<void> _redeemReward() async {
    try {
      final status = await TekLoyaltyServiceFlutter.redeemReward(
        userId: 'USER_ID',
        rewardId: 'REWARD_ID',
      );
      setState(() {
        _rewardStatus = status;
      });
    } catch (e) {
      print('Failed to redeem reward: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Loyalty Service'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('Your Points: $_points'),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: _redeemReward,
              child: Text('Redeem Reward'),
            ),
            SizedBox(height: 20),
            Text('Reward Status: $_rewardStatus'),
          ],
        ),
      ),
    );
  }
}

4. 处理事件监听

插件可能还提供了一些事件监听器，如当用户积分发生变化时触发的事件。你可以通过以下方式监听这些事件：

TekLoyaltyServiceFlutter.onPointsUpdated.listen((points) {
  print('Points updated: $points');
  setState(() {
    _points = points;
  });
});

5. 错误处理

在实际使用中，可能会遇到各种错误，如网络错误、API 错误等。你可以通过 try-catch 块来捕获和处理这些错误。

try {
  final points = await TekLoyaltyServiceFlutter.getUserPoints(userId: 'USER_ID');
  setState(() {
    _points = points;
  });
} catch (e) {
  print('Failed to fetch user points: $e');
  // 显示错误消息给用户
}

6. 注销和清理

当用户退出应用或不再需要忠诚度服务时，你可以调用注销方法来清理资源。

await TekLoyaltyServiceFlutter.logout();