增加支付

@@ -95,7 +95,7 @@ class MyApp extends StatelessWidget {
     }
     }
     interceptors.add(AdapterInterceptor());
     interceptors.add(AdapterInterceptor());
     configDio(
     configDio(
-      baseUrl: 'https://www.yiyan.pub/api/v1/',
+      baseUrl: 'https://api.parlando.ink/api/v1/',
       interceptors: interceptors,
       interceptors: interceptors,
     );
     );
   }
   }

 import 'dart:async';
 import 'dart:async';
-import 'dart:io';
 import 'dart:ui';
 import 'dart:ui';
 
 
 import 'package:Parlando/apis/api_response.dart';
 import 'package:Parlando/apis/api_response.dart';
 import 'package:Parlando/login/login_router.dart';
 import 'package:Parlando/login/login_router.dart';
 import 'package:Parlando/membership/models/membership_entity.dart';
 import 'package:Parlando/membership/models/membership_entity.dart';
 import 'package:Parlando/membership/view_models/membership_view_model.dart';
 import 'package:Parlando/membership/view_models/membership_view_model.dart';
+import 'package:Parlando/payment/payment_service.dart';
 import 'package:Parlando/res/constant.dart';
 import 'package:Parlando/res/constant.dart';
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flustars/flustars.dart';
 import 'package:flustars/flustars.dart';
@@ -14,6 +14,7 @@ import 'package:Parlando/res/resources.dart';
 import 'package:Parlando/routers/fluro_navigator.dart';
 import 'package:Parlando/routers/fluro_navigator.dart';
 import 'package:Parlando/extension/int_extension.dart';
 import 'package:Parlando/extension/int_extension.dart';
 import 'package:flutter_inapp_purchase/flutter_inapp_purchase.dart';
 import 'package:flutter_inapp_purchase/flutter_inapp_purchase.dart';
+import 'package:getwidget/getwidget.dart';
 import 'package:provider/provider.dart';
 import 'package:provider/provider.dart';
 
 
 class MembershipPage extends StatefulWidget {
 class MembershipPage extends StatefulWidget {
@@ -27,18 +28,7 @@ class MembershipPageState extends State<MembershipPage>
     with WidgetsBindingObserver {
     with WidgetsBindingObserver {
   bool _isLoading = false;
   bool _isLoading = false;
 
 
-  late StreamSubscription _purchaseUpdatedSubscription;
-  late StreamSubscription _purchaseErrorSubscription;
-  late StreamSubscription _conectionSubscription;
-  final List<String> _productLists = Platform.isAndroid
-      ? [
-          'test.yiyan.vip.1.month',
-        ]
-      : ['test.yiyan.vip.1.month'];
-
-  String _platformVersion = 'Unknown';
-  List<IAPItem> _items = [];
-  List<PurchasedItem> _purchases = [];
+  final List<Widget> _productWidgets = <Widget>[];
 
 
   @override
   @override
   void initState() {
   void initState() {
@@ -48,8 +38,7 @@ class MembershipPageState extends State<MembershipPage>
           .setSelectedMembership(null);
           .setSelectedMembership(null);
       Provider.of<MembershipViewProvider>(context, listen: false)
       Provider.of<MembershipViewProvider>(context, listen: false)
           .fetchMembershipData('0');
           .fetchMembershipData('0');
-
-      initPlatformState();
+      PaymentService.instance.initConnection();
     } else {
     } else {
       NavigatorUtils.push(context, LoginRouter.loginPage, replace: true);
       NavigatorUtils.push(context, LoginRouter.loginPage, replace: true);
     }
     }
@@ -130,9 +119,11 @@ class MembershipPageState extends State<MembershipPage>
                                 SizedBox(
                                 SizedBox(
                                   width: double.infinity,
                                   width: double.infinity,
                                   height: 100,
                                   height: 100,
-                                  child: Column(
-                                    children: _renderInApps(),
-                                  ),
+                                  child: _productWidgets.isEmpty
+                                      ? Column(
+                                          children: _productWidgets,
+                                        )
+                                      : const GFLoader(),
                                 ),
                                 ),
                                 Gaps.vGap24,
                                 Gaps.vGap24,
                                 Text(
                                 Text(
@@ -145,7 +136,7 @@ class MembershipPageState extends State<MembershipPage>
                                 Gaps.vGap10,
                                 Gaps.vGap10,
                                 Row(
                                 Row(
                                   mainAxisAlignment:
                                   mainAxisAlignment:
-                                  MainAxisAlignment.spaceBetween,
+                                      MainAxisAlignment.spaceBetween,
                                   mainAxisSize: MainAxisSize.min,
                                   mainAxisSize: MainAxisSize.min,
                                   crossAxisAlignment: CrossAxisAlignment.center,
                                   crossAxisAlignment: CrossAxisAlignment.center,
                                   children: [
                                   children: [
@@ -220,72 +211,15 @@ class MembershipPageState extends State<MembershipPage>
 
 
   @override
   @override
   void dispose() {
   void dispose() {
-    _conectionSubscription.cancel();
+    PaymentService.instance.dispose();
     super.dispose();
     super.dispose();
   }
   }
 
 
-  Future<void> initPlatformState() async {
-    String platformVersion;
-    // Platform messages may fail, so we use a try/catch PlatformException.
-
-    // prepare
-    var result = await FlutterInappPurchase.instance.initialize();
-    print('result: $result');
-
-    // If the widget was removed from the tree while the asynchronous platform
-    // message was in flight, we want to discard the reply rather than calling
-    // setState to update our non-existent appearance.
-    if (!mounted) return;
-
-    setState(() {
-      // _platformVersion = platformVersion;
-    });
-
-    // refresh items for android
-    try {
-      String msg = await FlutterInappPurchase.instance.consumeAll();
-      print('consumeAllItems: $msg');
-    } catch (err) {
-      print('consumeAllItems error: $err');
-    }
-
-    _conectionSubscription =
-        FlutterInappPurchase.connectionUpdated.listen((connected) {
-      print('connected: $connected');
-    });
-
-    _purchaseUpdatedSubscription =
-        FlutterInappPurchase.purchaseUpdated.listen((productItem) {
-      print('purchase-updated: $productItem');
-    });
-
-    _purchaseErrorSubscription =
-        FlutterInappPurchase.purchaseError.listen((purchaseError) {
-      print('purchase-error: $purchaseError');
-    });
-
-    List<IAPItem> items =
-        await FlutterInappPurchase.instance.getSubscriptions(_productLists);
-    for (var item in items) {
-      print('${item.toString()}');
-      _items.add(item);
-    }
-
-    setState(() {
-      _items = items;
-      _purchases = [];
-    });
-  }
-
-  List<Widget> _renderInApps() {
-    List<Widget> widgets = <Widget>[];
-    for (IAPItem item in _items) {
-      widgets.add(Text(item.title!));
+  void _renderInApps() async {
+    List<IAPItem> items = await PaymentService.instance.products;
+    for (IAPItem item in items) {
+      _productWidgets.add(Text(item.title!));
     }
     }
-    return widgets;
-  }
-
-  void _requestPurchase(IAPItem item) {
-    FlutterInappPurchase.instance.requestPurchase(item.productId!);
+    setState(() {});
   }
   }
 }
 }

+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:Parlando/util/toast_utils.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter_inapp_purchase/flutter_inapp_purchase.dart';
+
+class PaymentService {
+  /// We want singleton object of ``PaymentService`` so create private constructor
+  ///
+  /// Use PaymentService as ``PaymentService.instance``
+  PaymentService._internal();
+
+  static final PaymentService instance = PaymentService._internal();
+
+  /// To listen the status of connection between app and the billing server
+  late StreamSubscription<ConnectionResult> _connectionSubscription;
+
+  /// To listen the status of the purchase made inside or outside of the app (App Store / Play Store)
+  ///
+  /// If status is not error then app will be notied by this stream
+  late StreamSubscription<PurchasedItem?> _purchaseUpdatedSubscription;
+
+  /// To listen the errors of the purchase
+  late StreamSubscription<PurchaseResult?> _purchaseErrorSubscription;
+
+  /// List of product ids you want to fetch
+  final List<String> _productIds = ['test.yiyan.vip.1.month'];
+
+  /// All available products will be store in this list
+  late List<IAPItem> _products;
+
+  /// All past purchases will be store in this list
+  late List<PurchasedItem> _pastPurchases;
+
+  /// view of the app will subscribe to this to get notified
+  /// when premium status of the user changes
+  final ObserverList<Function> _proStatusChangedListeners =
+      ObserverList<Function>();
+
+  /// view of the app will subscribe to this to get errors of the purchase
+  final ObserverList<Function(String)> _errorListeners =
+      ObserverList<Function(String)>();
+
+  /// logged in user's premium status
+  bool _isProUser = false;
+
+  bool get isProUser => _isProUser;
+
+  /// view can subscribe to _proStatusChangedListeners using this method
+  addToProStatusChangedListeners(Function callback) {
+    _proStatusChangedListeners.add(callback);
+  }
+
+  /// view can cancel to _proStatusChangedListeners using this method
+  removeFromProStatusChangedListeners(Function callback) {
+    _proStatusChangedListeners.remove(callback);
+  }
+
+  /// view can subscribe to _errorListeners using this method
+  addToErrorListeners(Function(String) callback) {
+    _errorListeners.add(callback);
+  }
+
+  /// view can cancel to _errorListeners using this method
+  removeFromErrorListeners(Function(String) callback) {
+    _errorListeners.remove(callback);
+  }
+
+  /// Call this method to notify all the subsctibers of _proStatusChangedListeners
+  void _callProStatusChangedListeners() {
+    for (var callback in _proStatusChangedListeners) {
+      callback();
+    }
+  }
+
+  /// Call this method to notify all the subsctibers of _errorListeners
+  void _callErrorListeners(String error) {
+    for (var callback in _errorListeners) {
+      callback(error);
+    }
+  }
+
+  /// Call this method at the startup of you app to initialize connection
+  /// with billing server and get all the necessary data
+  void initConnection() {
+    var result = FlutterInappPurchase.instance.initialize();
+    print("___________________________");
+    print("result:$result");
+    _connectionSubscription =
+        FlutterInappPurchase.connectionUpdated.listen((connected) {});
+
+    _purchaseUpdatedSubscription =
+        FlutterInappPurchase.purchaseUpdated.listen(_handlePurchaseUpdate);
+
+    _purchaseErrorSubscription =
+        FlutterInappPurchase.purchaseError.listen(_handlePurchaseError);
+
+    _getItems();
+    _getPastPurchases();
+  }
+
+  /// call when user close the app
+  void dispose() {
+    _connectionSubscription.cancel();
+    _purchaseErrorSubscription.cancel();
+    _purchaseUpdatedSubscription.cancel();
+    FlutterInappPurchase.instance.finalize();
+  }
+
+  void _handlePurchaseError(PurchaseResult? purchaseError) {
+    _callErrorListeners(purchaseError!.message.toString());
+  }
+
+  /// Called when new updates arrives at ``purchaseUpdated`` stream
+  void _handlePurchaseUpdate(PurchasedItem? productItem) async {
+    if (Platform.isAndroid) {
+      await _handlePurchaseUpdateAndroid(productItem!);
+    } else {
+      await _handlePurchaseUpdateIOS(productItem!);
+    }
+  }
+
+  Future<void> _handlePurchaseUpdateIOS(PurchasedItem purchasedItem) async {
+    switch (purchasedItem.transactionStateIOS) {
+      case TransactionState.deferred:
+        // Edit: This was a bug that was pointed out here : https://github.com/dooboolab/flutter_inapp_purchase/issues/234
+        // FlutterInappPurchase.instance.finishTransaction(purchasedItem);
+        break;
+      case TransactionState.failed:
+        _callErrorListeners("Transaction Failed");
+        FlutterInappPurchase.instance.finishTransaction(purchasedItem);
+        break;
+      case TransactionState.purchased:
+        await _verifyAndFinishTransaction(purchasedItem);
+        break;
+      case TransactionState.purchasing:
+        break;
+      case TransactionState.restored:
+        FlutterInappPurchase.instance.finishTransaction(purchasedItem);
+        break;
+      default:
+    }
+  }
+
+  /// three purchase state https://developer.android.com/reference/com/android/billingclient/api/Purchase.PurchaseState
+  /// 0 : UNSPECIFIED_STATE
+  /// 1 : PURCHASED
+  /// 2 : PENDING
+  Future<void> _handlePurchaseUpdateAndroid(PurchasedItem purchasedItem) async {
+    switch (purchasedItem.purchaseStateAndroid) {
+      case PurchaseState.purchased:
+        if (purchasedItem.isAcknowledgedAndroid == null) {
+          await _verifyAndFinishTransaction(purchasedItem);
+        }
+        break;
+      default:
+        _callErrorListeners("Something went wrong");
+    }
+  }
+
+  /// Call this method when status of purchase is success
+  /// Call API of your back end to verify the receipt
+  /// back end has to call billing server's API to verify the purchase token
+  _verifyAndFinishTransaction(PurchasedItem purchasedItem) async {
+    bool isValid = false;
+    try {
+      // Call API
+      isValid = await _verifyPurchase(purchasedItem);
+    } on Exception {
+      _callErrorListeners("暂时无法购买，请稍后再试!");
+      return;
+    }
+
+    if (isValid) {
+      FlutterInappPurchase.instance.finishTransaction(purchasedItem);
+      _isProUser = true;
+      // save in sharedPreference here
+      _callProStatusChangedListeners();
+    } else {
+      _callErrorListeners("Verification failed");
+    }
+  }
+
+  Future<List<IAPItem>> get products async {
+    if (_products == null) {
+      await _getItems();
+    }
+    return _products;
+  }
+
+  Future<void> _getItems() async {
+    List<IAPItem> items =
+        await FlutterInappPurchase.instance.getSubscriptions(_productIds);
+    _products = [];
+    for (var item in items) {
+      _products.add(item);
+    }
+    print("############");
+    print(_products);
+  }
+
+  void _getPastPurchases() async {
+    // remove this if you want to restore past purchases in iOS
+    if (Platform.isIOS) {
+      return;
+    }
+    List<PurchasedItem>? purchasedItems =
+        await FlutterInappPurchase.instance.getAvailablePurchases();
+
+    for (var purchasedItem in purchasedItems!) {
+      bool isValid = false;
+
+      if (Platform.isAndroid) {
+        Map map = json.decode(purchasedItem.transactionReceipt!);
+        // if your app missed finishTransaction due to network or crash issue
+        // finish transactins
+        if (!map['acknowledged']) {
+          isValid = await _verifyPurchase(purchasedItem);
+          if (isValid) {
+            FlutterInappPurchase.instance.finishTransaction(purchasedItem);
+            _isProUser = true;
+            _callProStatusChangedListeners();
+          }
+        } else {
+          _isProUser = true;
+          _callProStatusChangedListeners();
+        }
+      }
+    }
+
+    _pastPurchases = [];
+    _pastPurchases.addAll(purchasedItems);
+  }
+
+  Future<void> buyProduct(IAPItem item) async {
+    try {
+      await FlutterInappPurchase.instance
+          .requestSubscription(item.productId.toString());
+    } catch (error) {
+      Toast.show("购买失败!");
+    }
+  }
+
+  _verifyPurchase(PurchasedItem purchasedItem) {}
+}