Flutter应用内购买优惠管理插件in_app_purchase_offers的使用

Flutter应用内购买优惠管理插件in_app_purchase_offers的使用

插件概述

in_app_purchase_offers 是一个用于管理 Flutter 应用内购买优惠的插件。通过该插件，开发者可以轻松地查询和展示产品及其促销优惠信息。

示例代码

以下是一个完整的示例代码，展示了如何在 Flutter 应用中使用 in_app_purchase_offers 插件来管理应用内购买优惠。

import 'package:flutter/material.dart';
import 'package:in_app_purchase_offers/in_app_purchase_offers.dart';
import 'package:in_app_purchase_offers_example/store/store.dart';

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

class MyApp extends StatelessWidget {

  final store = Store();

  MyApp({
    super.key,
  });

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: MyHomePage(
        title: 'Flutter Demo Home Page',
        store: store,
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final Store store;

  const MyHomePage({
    super.key,
    required this.title,
    required this.store,
  });

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: ListView(
          children: <Widget>[
            StreamBuilder(stream: widget.store.products,
              builder: (context, snapshot) {
                if (!snapshot.hasData) {
                  return const Text('Loading...');
                }
                if (snapshot.hasError) {
                  return Text('Error: ${snapshot.error}');
                }
                if (snapshot.data?.isEmpty == true) {
                  return const Text('No products found');
                }
                return Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    for (var product in snapshot.requireData)
                      Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text('Product: ${product.title}'),
                          const SizedBox(height: 18),
                          Builder(
                            builder: (context) {
                              debugPrint(product.introductoryOffer?.forDisplay(context));
                              return Text('Intro Offer: ${product.introductoryOffer?.forDisplay(context)}', maxLines: 3);
                            }
                          ),
                          const SizedBox(height: 12),
                          for (final offer in product.promotionalOffers) ...[
                            Text(offer.id?.toString() ?? 'No ID', style: DefaultTextStyle.of(context).style.copyWith(fontWeight: FontWeight.bold)),
                            Builder(
                              builder: (context) {
                                debugPrint(offer.forDisplay(context));
                                return Text('Promo Offer: ${offer.forDisplay(context)}', maxLines: 3);
                              }
                            ),
                            const SizedBox(height: 12),
                          ],
                          const SizedBox(height: 24),
                        ],
                      )
                  ],
                );
              },
            ),
            const SizedBox(height: 24),
            TextButton(
              onPressed: () async {
                try {
                  await widget.store.queryProducts();
                } catch (e) {
                  debugPrint('Error: $e');
                  if (context.mounted) {
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('Error: $e'))
                    );
                  }
                }
              },
              child: const Text('Query Products')
            ),
            const SizedBox(height: 12),
            TextButton(
              onPressed: () async {
                try {
                  await widget.store.restorePurchases();
                } catch (e) {
                  debugPrint('Error: $e');
                  if (context.mounted) {
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('Error: $e'))
                    );
                  }
                }
              },
              child: const Text('Restore Purchases')
            ),
          ],
        ),
      ),
    );
  }
}

代码解释

  1. 导入必要的库

    import 'package:flutter/material.dart';
import 'package:in_app_purchase_offers/in_app_purchase_offers.dart';
import 'package:in_app_purchase_offers_example/store/store.dart';

  2. 初始化应用

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

class MyApp extends StatelessWidget {
  final store = Store();

  MyApp({
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: MyHomePage(
        title: 'Flutter Demo Home Page',
        store: store,
      ),
    );
  }
}

  3. 创建主页面

    class MyHomePage extends StatefulWidget {
  final Store store;

  const MyHomePage({
    super.key,
    required this.title,
    required this.store,
  });

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

  4. 构建页面内容

    class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: ListView(
          children: <Widget>[
            StreamBuilder(stream: widget.store.products,
              builder: (context, snapshot) {
                if (!snapshot.hasData) {
                  return const Text('Loading...');
                }
                if (snapshot.hasError) {
                  return Text('Error: ${snapshot.error}');
                }
                if (snapshot.data?.isEmpty == true) {
                  return const Text('No products found');
                }
                return Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    for (var product in snapshot.requireData)
                      Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text('Product: ${product.title}'),
                          const SizedBox(height: 18),
                          Builder(
                            builder: (context) {
                              debugPrint(product.introductoryOffer?.forDisplay(context));
                              return Text('Intro Offer: ${product.introductoryOffer?.forDisplay(context)}', maxLines: 3);
                            }
                          ),
                          const SizedBox(height: 12),
                          for (final offer in product.promotionalOffers) ...[
                            Text(offer.id?.toString() ?? 'No ID', style: DefaultTextStyle.of(context).style.copyWith(fontWeight: FontWeight.bold)),
                            Builder(
                              builder: (context) {
                                debugPrint(offer.forDisplay(context));
                                return Text('Promo Offer: ${offer.forDisplay(context)}', maxLines: 3);
                              }
                            ),
                            const SizedBox(height: 12),
                          ],
                          const SizedBox(height: 24),
                        ],
                      )
                  ],
                );
              },
            ),
            const SizedBox(height: 24),
            TextButton(
              onPressed: () async {
                try {
                  await widget.store.queryProducts();
                } catch (e) {
                  debugPrint('Error: $e');
                  if (context.mounted) {
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('Error: $e'))
                    );
                  }
                }
              },
              child: const Text('Query Products')
            ),
            const SizedBox(height: 12),
            TextButton(
              onPressed: () async {
                try {
                  await widget.store.restorePurchases();
                } catch (e) {
                  debugPrint('Error: $e');
                  if (context.mounted) {
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('Error: $e'))
                    );
                  }
                }
              },
              child: const Text('Restore Purchases')
            ),
          ],
        ),
      ),
    );
  }
}

更多关于Flutter应用内购买优惠管理插件in_app_purchase_offers的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter应用内购买优惠管理插件in_app_purchase_offers的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


in_app_purchase_offers 是一个用于管理 Flutter 应用内购买优惠的插件。它允许开发者在应用内购买时设置和管理优惠，例如折扣、免费试用期等。以下是如何使用 in_app_purchase_offers 插件的基本步骤：

1. 添加依赖

首先，在 pubspec.yaml 文件中添加 in_app_purchase_offers 依赖：

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

然后运行 flutter pub get 来安装依赖。

2. 初始化插件

在你的 Dart 文件中导入插件并进行初始化：

import 'package:in_app_purchase_offers/in_app_purchase_offers.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await InAppPurchaseOffers.initialize();
  runApp(MyApp());
}

3. 设置优惠

你可以通过 InAppPurchaseOffers 类来设置和管理应用内购买的优惠。例如，设置一个折扣优惠：

void setDiscountOffer() async {
  const String productId = 'com.example.product1';
  const double discountPrice = 0.99;  // 折扣价格
  const DateTime startDate = DateTime(2023, 10, 1);  // 优惠开始日期
  const DateTime endDate = DateTime(2023, 10, 31);  // 优惠结束日期

  try {
    await InAppPurchaseOffers.setDiscountOffer(
      productId: productId,
      discountPrice: discountPrice,
      startDate: startDate,
      endDate: endDate,
    );
    print('Discount offer set successfully');
  } catch (e) {
    print('Error setting discount offer: $e');
  }
}

4. 获取优惠信息

你可以通过 InAppPurchaseOffers 类来获取应用内购买的优惠信息：

void getDiscountOffer() async {
  const String productId = 'com.example.product1';

  try {
    final offer = await InAppPurchaseOffers.getDiscountOffer(productId: productId);
    if (offer != null) {
      print('Discount price: ${offer.discountPrice}');
      print('Start date: ${offer.startDate}');
      print('End date: ${offer.endDate}');
    } else {
      print('No discount offer found for product $productId');
    }
  } catch (e) {
    print('Error getting discount offer: $e');
  }
}

5. 移除优惠

你可以通过 InAppPurchaseOffers 类来移除应用内购买的优惠：

void removeDiscountOffer() async {
  const String productId = 'com.example.product1';

  try {
    await InAppPurchaseOffers.removeDiscountOffer(productId: productId);
    print('Discount offer removed successfully');
  } catch (e) {
    print('Error removing discount offer: $e');
  }
}

6. 监听优惠变化

你可以监听应用内购买优惠的变化，以便及时更新 UI：

void listenToOfferChanges() {
  InAppPurchaseOffers.offerChanges.listen((offer) {
    print('Offer changed: ${offer.productId}, ${offer.discountPrice}');
  });
}

7. 处理应用内购买

在处理应用内购买时，确保应用内购买逻辑与优惠逻辑结合使用。例如，在用户购买时应用优惠价格：

void purchaseProduct() async {
  const String productId = 'com.example.product1';

  try {
    final offer = await InAppPurchaseOffers.getDiscountOffer(productId: productId);
    final price = offer?.discountPrice ?? 1.99;  // 使用优惠价格或默认价格

    // 处理应用内购买逻辑
    // ...

  } catch (e) {
    print('Error purchasing product: $e');
  }
}
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