Flutter应用内购买插件pbs_in_app_purchases_package的使用

简介

<pbs_in_app_purchases_package 是一个用于处理 Flutter 应用内购买的插件。它提供了简化且统一的 API，支持在 iOS 和 Android 平台上获取商品列表、进行购买以及恢复购买。

功能

• 提供了简化且统一的 API 来处理 iOS 和 Android 的应用内购买。
• 支持获取商品列表、执行购买以及恢复之前的购买记录。

使用步骤

1. 添加依赖

在项目的 pubspec.yaml 文件中添加 pbs_in_app_purchases_package 作为依赖项：

dependencies:
  pbs_in_app_purchases_package: ^1.0.0

然后运行以下命令以安装依赖：

flutter pub get

2. 初始化插件

在使用插件之前，需要初始化并配置插件。以下是初始化的基本代码：

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: InAppPurchaseScreen(),
    );
  }
}

3. 获取商品列表

首先，我们需要定义要购买的商品 ID，并调用插件来获取商品列表。

class InAppPurchaseScreen extends StatefulWidget {
  @override
  _InAppPurchaseScreenState createState() => _InAppPurchaseScreenState();
}

class _InAppPurchaseScreenState extends State<InAppPurchaseScreen> {
  List<String> productIds = ['product_id_1', 'product_id_2'];
  List<ProductDetails> products = [];

  Future<void> fetchProducts() async {
    // 调用插件获取商品列表
    final availableProducts = await PbsInAppPurchasesPackage.getProducts(productIds);
    
    setState(() {
      products = availableProducts;
    });
  }

  @override
  void initState() {
    super.initState();
    fetchProducts(); // 在初始化时获取商品列表
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('应用内购买示例'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => PurchaseScreen(products)),
                );
              },
              child: Text('开始购买'),
            ),
          ],
        ),
      ),
    );
  }
}

4. 执行购买

接下来，在单独的页面中实现购买逻辑。

class PurchaseScreen extends StatefulWidget {
  final List<ProductDetails> products;

  PurchaseScreen(this.products);

  @override
  _PurchaseScreenState createState() => _PurchaseScreenState();
}

class _PurchaseScreenState extends State<PurchaseScreen> {
  late ProductDetails selectedProduct;
  late PurchaseState purchaseState;

  @override
  void initState() {
    super.initState();
    selectedProduct = widget.products.first; // 默认选择第一个商品
    purchaseState = PurchaseState.notPurchased;
  }

  Future<void> initiatePurchase() async {
    try {
      // 开始购买流程
      final PurchaseResponse response = await PbsInAppPurchasesPackage.initiatePurchase(selectedProduct);

      if (response.status == PurchaseStatus.successful) {
        setState(() {
          purchaseState = PurchaseState.purchased;
        });
      } else {
        setState(() {
          purchaseState = PurchaseState.failed;
        });
      }
    } catch (e) {
      print('购买失败: $e');
      setState(() {
        purchaseState = PurchaseState.failed;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('选择商品'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('已选商品: ${selectedProduct.title}'),
            ElevatedButton(
              onPressed: initiatePurchase,
              child: Text('购买商品'),
            ),
            SizedBox(height: 20),
            Text(
              '购买状态: ${purchaseState == PurchaseState.purchased ? '已购买' : (purchaseState == PurchaseState.failed ? '失败' : '未购买')}',
              style: TextStyle(fontSize: 18),
            ),
          ],
        ),
      ),
    );
  }
}

// 枚举定义购买状态
enum PurchaseState { notPurchased, purchased, failed }

5. 恢复购买

最后，我们可以通过插件提供的功能来恢复用户的购买记录。

Future<void> restorePurchases() async {
  try {
    final List<PurchaseDetails> restorablePurchases = await PbsInAppPurchasesPackage.restorePurchases();

    if (restorablePurchases.isNotEmpty) {
      print('恢复的购买记录: ${restorablePurchases.map((p) => p.productId).join(', ')}');
    } else {
      print('没有找到可恢复的购买记录');
    }
  } catch (e) {
    print('恢复购买失败: $e');
  }
}