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An implementation for the Android platform of the Flutter `in_app_purchase` plugin. This uses the Android BillingClient APIs.

example/lib/main.dart

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:in_app_purchase_android/billing_client_wrappers.dart';
import 'package:in_app_purchase_android/in_app_purchase_android.dart';
import 'package:in_app_purchase_platform_interface/in_app_purchase_platform_interface.dart';

import 'consumable_store.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  // When using the Android plugin directly it is mandatory to register
  // the plugin as default instance as part of initializing the app.
  InAppPurchaseAndroidPlatform.registerPlatform();

  runApp(_MyApp());
}

const bool _kAutoConsume = true;

const String _kConsumableId = 'consumable';
const String _kUpgradeId = 'upgrade';
const String _kSilverSubscriptionId = 'subscription_silver1';
const String _kGoldSubscriptionId = 'subscription_gold1';
const List<String> _kProductIds = <String>[
  _kConsumableId,
  _kUpgradeId,
  _kSilverSubscriptionId,
  _kGoldSubscriptionId,
];

class _MyApp extends StatefulWidget {
  @override
  State<_MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<_MyApp> {
  final InAppPurchasePlatform _inAppPurchasePlatform =
      InAppPurchasePlatform.instance;
  late StreamSubscription<List<PurchaseDetails>> _subscription;
  List<String> _notFoundIds = <String>[];
  List<ProductDetails> _products = <ProductDetails>[];
  List<PurchaseDetails> _purchases = <PurchaseDetails>[];
  List<String> _consumables = <String>[];
  bool _isAvailable = false;
  bool _purchasePending = false;
  bool _loading = true;
  String? _queryProductError;

  @override
  void initState() {
    final Stream<List<PurchaseDetails>> purchaseUpdated =
        _inAppPurchasePlatform.purchaseStream;
    _subscription =
        purchaseUpdated.listen((List<PurchaseDetails> purchaseDetailsList) {
      _listenToPurchaseUpdated(purchaseDetailsList);
    }, onDone: () {
      _subscription.cancel();
    }, onError: (Object error) {
      // handle error here.
    });
    initStoreInfo();
    super.initState();
  }

  Future<void> initStoreInfo() async {
    final bool isAvailable = await _inAppPurchasePlatform.isAvailable();
    if (!isAvailable) {
      setState(() {
        _isAvailable = isAvailable;
        _products = <ProductDetails>[];
        _purchases = <PurchaseDetails>[];
        _notFoundIds = <String>[];
        _consumables = <String>[];
        _purchasePending = false;
        _loading = false;
      });
      return;
    }

    final ProductDetailsResponse productDetailResponse =
        await _inAppPurchasePlatform.queryProductDetails(_kProductIds.toSet());
    if (productDetailResponse.error != null) {
      setState(() {
        _queryProductError = productDetailResponse.error!.message;
        _isAvailable = isAvailable;
        _products = productDetailResponse.productDetails;
        _purchases = <PurchaseDetails>[];
        _notFoundIds = productDetailResponse.notFoundIDs;
        _consumables = <String>[];
        _purchasePending = false;
        _loading = false;
      });
      return;
    }

    if (productDetailResponse.productDetails.isEmpty) {
      setState(() {
        _queryProductError = null;
        _isAvailable = isAvailable;
        _products = productDetailResponse.productDetails;
        _purchases = <PurchaseDetails>[];
        _notFoundIds = productDetailResponse.notFoundIDs;
        _consumables = <String>[];
        _purchasePending = false;
        _loading = false;
      });
      return;
    }

    await _inAppPurchasePlatform.restorePurchases();

    final List<String> consumables = await ConsumableStore.load();
    setState(() {
      _isAvailable = isAvailable;
      _products = productDetailResponse.productDetails;
      _notFoundIds = productDetailResponse.notFoundIDs;
      _consumables = consumables;
      _purchasePending = false;
      _loading = false;
    });
  }

  @override
  void dispose() {
    _subscription.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final List<Widget> stack = <Widget>[];
    if (_queryProductError == null) {
      stack.add(
        ListView(
          children: <Widget>[
            _buildConnectionCheckTile(),
            _buildProductList(),
            _buildConsumableBox(),
            _FeatureCard(),
          ],
        ),
      );
    } else {
      stack.add(Center(
        child: Text(_queryProductError!),
      ));
    }
    if (_purchasePending) {
      stack.add(
        Stack(
          children: const <Widget>[
            Opacity(
              opacity: 0.3,
              child: ModalBarrier(dismissible: false, color: Colors.grey),
            ),
            Center(
              child: CircularProgressIndicator(),
            ),
          ],
        ),
      );
    }

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('IAP Example'),
        ),
        body: Stack(
          children: stack,
        ),
      ),
    );
  }

  Card _buildConnectionCheckTile() {
    if (_loading) {
      return const Card(child: ListTile(title: Text('Trying to connect...')));
    }
    final Widget storeHeader = ListTile(
      leading: Icon(_isAvailable ? Icons.check : Icons.block,
          color: _isAvailable ? Colors.green : ThemeData.light().errorColor),
      title:
          Text('The store is ${_isAvailable ? 'available' : 'unavailable'}.'),
    );
    final List<Widget> children = <Widget>[storeHeader];

    if (!_isAvailable) {
      children.addAll(<Widget>[
        const Divider(),
        ListTile(
          title: Text('Not connected',
              style: TextStyle(color: ThemeData.light().errorColor)),
          subtitle: const Text(
              'Unable to connect to the payments processor. Has this app been configured correctly? See the example README for instructions.'),
        ),
      ]);
    }
    return Card(child: Column(children: children));
  }

  Card _buildProductList() {
    if (_loading) {
      return const Card(
          child: ListTile(
              leading: CircularProgressIndicator(),
              title: Text('Fetching products...')));
    }
    if (!_isAvailable) {
      return const Card();
    }
    const ListTile productHeader = ListTile(title: Text('Products for Sale'));
    final List<ListTile> productList = <ListTile>[];
    if (_notFoundIds.isNotEmpty) {
      productList.add(ListTile(
          title: Text('[${_notFoundIds.join(", ")}] not found',
              style: TextStyle(color: ThemeData.light().errorColor)),
          subtitle: const Text(
              'This app needs special configuration to run. Please see example/README.md for instructions.')));
    }

    // This loading previous purchases code is just a demo. Please do not use this as it is.
    // In your app you should always verify the purchase data using the `verificationData` inside the [PurchaseDetails] object before trusting it.
    // We recommend that you use your own server to verify the purchase data.
    final Map<String, PurchaseDetails> purchases =
        Map<String, PurchaseDetails>.fromEntries(
            _purchases.map((PurchaseDetails purchase) {
      if (purchase.pendingCompletePurchase) {
        _inAppPurchasePlatform.completePurchase(purchase);
      }
      return MapEntry<String, PurchaseDetails>(purchase.productID, purchase);
    }));
    productList.addAll(_products.map(
      (ProductDetails productDetails) {
        final PurchaseDetails? previousPurchase = purchases[productDetails.id];
        return ListTile(
            title: Text(
              productDetails.title,
            ),
            subtitle: Text(
              productDetails.description,
            ),
            trailing: previousPurchase != null
                ? IconButton(
                    onPressed: () {
                      final InAppPurchaseAndroidPlatformAddition addition =
                          InAppPurchasePlatformAddition.instance!
                              as InAppPurchaseAndroidPlatformAddition;
                      final SkuDetailsWrapper skuDetails =
                          (productDetails as GooglePlayProductDetails)
                              .skuDetails;
                      addition
                          .launchPriceChangeConfirmationFlow(
                              sku: skuDetails.sku)
                          .then((BillingResultWrapper value) => print(
                              'confirmationResponse: ${value.responseCode}'));
                    },
                    icon: const Icon(Icons.upgrade))
                : TextButton(
                    style: TextButton.styleFrom(
                      backgroundColor: Colors.green[800],
                      // TODO(darrenaustin): Migrate to new API once it lands in stable: https://github.com/flutter/flutter/issues/105724
                      // ignore: deprecated_member_use
                      primary: Colors.white,
                    ),
                    onPressed: () {
                      // NOTE: If you are making a subscription purchase/upgrade/downgrade, we recommend you to
                      // verify the latest status of you your subscription by using server side receipt validation
                      // and update the UI accordingly. The subscription purchase status shown
                      // inside the app may not be accurate.
                      final GooglePlayPurchaseDetails? oldSubscription =
                          _getOldSubscription(
                              productDetails as GooglePlayProductDetails,
                              purchases);
                      final GooglePlayPurchaseParam purchaseParam =
                          GooglePlayPurchaseParam(
                              productDetails: productDetails,
                              applicationUserName: null,
                              changeSubscriptionParam: oldSubscription != null
                                  ? ChangeSubscriptionParam(
                                      oldPurchaseDetails: oldSubscription,
                                      prorationMode: ProrationMode
                                          .immediateWithTimeProration)
                                  : null);
                      if (productDetails.id == _kConsumableId) {
                        _inAppPurchasePlatform.buyConsumable(
                            purchaseParam: purchaseParam,
                            autoConsume: _kAutoConsume || Platform.isIOS);
                      } else {
                        _inAppPurchasePlatform.buyNonConsumable(
                            purchaseParam: purchaseParam);
                      }
                    },
                    child: Text(productDetails.price),
                  ));
      },
    ));

    return Card(
        child: Column(
            children: <Widget>[productHeader, const Divider()] + productList));
  }

  Card _buildConsumableBox() {
    if (_loading) {
      return const Card(
          child: ListTile(
              leading: CircularProgressIndicator(),
              title: Text('Fetching consumables...')));
    }
    if (!_isAvailable || _notFoundIds.contains(_kConsumableId)) {
      return const Card();
    }
    const ListTile consumableHeader =
        ListTile(title: Text('Purchased consumables'));
    final List<Widget> tokens = _consumables.map((String id) {
      return GridTile(
        child: IconButton(
          icon: const Icon(
            Icons.stars,
            size: 42.0,
            color: Colors.orange,
          ),
          splashColor: Colors.yellowAccent,
          onPressed: () => consume(id),
        ),
      );
    }).toList();
    return Card(
        child: Column(children: <Widget>[
      consumableHeader,
      const Divider(),
      GridView.count(
        crossAxisCount: 5,
        shrinkWrap: true,
        padding: const EdgeInsets.all(16.0),
        children: tokens,
      )
    ]));
  }

  Future<void> consume(String id) async {
    await ConsumableStore.consume(id);
    final List<String> consumables = await ConsumableStore.load();
    setState(() {
      _consumables = consumables;
    });
  }

  void showPendingUI() {
    setState(() {
      _purchasePending = true;
    });
  }

  Future<void> deliverProduct(PurchaseDetails purchaseDetails) async {
    // IMPORTANT!! Always verify purchase details before delivering the product.
    if (purchaseDetails.productID == _kConsumableId) {
      await ConsumableStore.save(purchaseDetails.purchaseID!);
      final List<String> consumables = await ConsumableStore.load();
      setState(() {
        _purchasePending = false;
        _consumables = consumables;
      });
    } else {
      setState(() {
        _purchases.add(purchaseDetails);
        _purchasePending = false;
      });
    }
  }

  void handleError(IAPError error) {
    setState(() {
      _purchasePending = false;
    });
  }

  Future<bool> _verifyPurchase(PurchaseDetails purchaseDetails) {
    // IMPORTANT!! Always verify a purchase before delivering the product.
    // For the purpose of an example, we directly return true.
    return Future<bool>.value(true);
  }

  void _handleInvalidPurchase(PurchaseDetails purchaseDetails) {
    // handle invalid purchase here if  _verifyPurchase` failed.
  }

  Future<void> _listenToPurchaseUpdated(
      List<PurchaseDetails> purchaseDetailsList) async {
    for (final PurchaseDetails purchaseDetails in purchaseDetailsList) {
      if (purchaseDetails.status == PurchaseStatus.pending) {
        showPendingUI();
      } else {
        if (purchaseDetails.status == PurchaseStatus.error) {
          handleError(purchaseDetails.error!);
        } else if (purchaseDetails.status == PurchaseStatus.purchased ||
            purchaseDetails.status == PurchaseStatus.restored) {
          final bool valid = await _verifyPurchase(purchaseDetails);
          if (valid) {
            deliverProduct(purchaseDetails);
          } else {
            _handleInvalidPurchase(purchaseDetails);
            return;
          }
        }

        if (!_kAutoConsume && purchaseDetails.productID == _kConsumableId) {
          final InAppPurchaseAndroidPlatformAddition addition =
              InAppPurchasePlatformAddition.instance!
                  as InAppPurchaseAndroidPlatformAddition;

          await addition.consumePurchase(purchaseDetails);
        }

        if (purchaseDetails.pendingCompletePurchase) {
          await _inAppPurchasePlatform.completePurchase(purchaseDetails);
        }
      }
    }
  }

  GooglePlayPurchaseDetails? _getOldSubscription(
      GooglePlayProductDetails productDetails,
      Map<String, PurchaseDetails> purchases) {
    // This is just to demonstrate a subscription upgrade or downgrade.
    // This method assumes that you have only 2 subscriptions under a group, 'subscription_silver' & 'subscription_gold'.
    // The 'subscription_silver' subscription can be upgraded to 'subscription_gold' and
    // the 'subscription_gold' subscription can be downgraded to 'subscription_silver'.
    // Please remember to replace the logic of finding the old subscription Id as per your app.
    // The old subscription is only required on Android since Apple handles this internally
    // by using the subscription group feature in iTunesConnect.
    GooglePlayPurchaseDetails? oldSubscription;
    if (productDetails.id == _kSilverSubscriptionId &&
        purchases[_kGoldSubscriptionId] != null) {
      oldSubscription =
          purchases[_kGoldSubscriptionId]! as GooglePlayPurchaseDetails;
    } else if (productDetails.id == _kGoldSubscriptionId &&
        purchases[_kSilverSubscriptionId] != null) {
      oldSubscription =
          purchases[_kSilverSubscriptionId]! as GooglePlayPurchaseDetails;
    }
    return oldSubscription;
  }
}

class _FeatureCard extends StatelessWidget {
  _FeatureCard({Key? key}) : super(key: key);

  final InAppPurchaseAndroidPlatformAddition addition =
      InAppPurchasePlatformAddition.instance!
          as InAppPurchaseAndroidPlatformAddition;

  @override
  Widget build(BuildContext context) {
    return Card(
        child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
          const ListTile(title: Text('Available features')),
          const Divider(),
          for (BillingClientFeature feature in BillingClientFeature.values)
            _buildFeatureWidget(feature),
        ]));
  }

  Widget _buildFeatureWidget(BillingClientFeature feature) {
    return FutureBuilder<bool>(
      future: addition.isFeatureSupported(feature),
      builder: (BuildContext context, AsyncSnapshot<bool> snapshot) {
        Color color = Colors.grey;
        final bool? data = snapshot.data;
        if (data != null) {
          color = data ? Colors.green : Colors.red;
        }
        return Padding(
          padding: const EdgeInsets.fromLTRB(16.0, 4.0, 16.0, 4.0),
          child: Text(
            _featureToString(feature),
            style: TextStyle(color: color),
          ),
        );
      },
    );
  }

  String _featureToString(BillingClientFeature feature) {
    switch (feature) {
      case BillingClientFeature.inAppItemsOnVR:
        return 'inAppItemsOnVR';
      case BillingClientFeature.priceChangeConfirmation:
        return 'priceChangeConfirmation';
      case BillingClientFeature.subscriptions:
        return 'subscriptions';
      case BillingClientFeature.subscriptionsOnVR:
        return 'subscriptionsOnVR';
      case BillingClientFeature.subscriptionsUpdate:
        return 'subscriptionsUpdate';
    }
  }
}
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Publisher

verified publisherflutter.dev

An implementation for the Android platform of the Flutter `in_app_purchase` plugin. This uses the Android BillingClient APIs.

Repository (GitHub)
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License

unknown (LICENSE)

Dependencies

collection, flutter, in_app_purchase_platform_interface, json_annotation

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