问flutter in_app_purchases在模拟器上不可用-获取错误

EN

import 'dart:async';
import 'dart:io';
import 'package:in_app_purchase/in_app_purchase.dart';
import 'package:quifil/models/status_ml.dart';

class StoreAPI {
  InAppPurchaseConnection _iap;
  bool available = true;
  StreamSubscription> _subscription;
  final String myProductID = 'quifil_ad_free';
  bool _isPurchased = false;
  List _purchases = [];
  List _products = [];

  StoreAPI() {
    InAppPurchaseConnection.enablePendingPurchases();
    _iap = InAppPurchaseConnection.instance;
  }

  bool get isPurchased {
    return _isPurchased;
  }

  set isPurchased(bool value) {
    _isPurchased = value;
  }

  List get purchases {
    return _purchases;
  }

  set purchases(List value) {
    _purchases = value;
  }

  List get products {
    return _products;
  }

  set products(List value) {
    _products = value;
  }

  Future fetchStoreInfo() async {
    Status status = Status(true);
    bool available = await _iap.isAvailable();
    if (available) {
      await _getProducts();
      await _getPastPurchases();
      verifyPurchase();
      _subscription = _iap.purchaseUpdatedStream.listen((purchases) {
        purchases.addAll(purchases);
        verifyPurchase();
      });
    } else {
      status.success = false;
      status.error = "Store is unavailable";
    }
    return status;
  }

  Future _getProducts() async {
    Set ids = Set.from([myProductID]);
    ProductDetailsResponse response = await _iap.queryProductDetails(ids);
    products = response.productDetails;
  }

  Future _getPastPurchases() async {
    QueryPurchaseDetailsResponse response = await _iap.queryPastPurchases();
    for (PurchaseDetails purchase in response.pastPurchases) {
      if (Platform.isIOS) {
        _iap.consumePurchase(purchase);
      }
    }
    purchases = response.pastPurchases;
  }

  void verifyPurchase() {
    PurchaseDetails purchase = hasPurchased(myProductID);
    if (purchase != null && purchase.status == PurchaseStatus.purchased) {
      if (purchase.pendingCompletePurchase) {
        _iap.completePurchase(purchase);
        isPurchased = true;
      }
    }
  }

  PurchaseDetails hasPurchased(String productID) {
    return purchases.firstWhere((purchase) => purchase.productID == productID,
        orElse: () => null);
  }
}