GooglePlayPurchaseService - GetPrices

GooglePlayPurchaseService.cs

public class GooglePlayPurchaseService : PurchaseService
{
    private BillingConnection _connection;

    private sealed class Product
    {
        public string Title { get; set; }
        public string Price { get; set; }
        public string Type { get; set; }
        public string Description { get; set; }
        public string ProductId { get; set; }
    }

    private async Task Connect()
    {
        if (_connection == null)
        {
            _connection = new BillingConnection();
            await _connection.Connect();
        }
    }

    public async override Task<Purchase[]> GetPrices(params string[] ids)
    {
        await Connect();

        var querySku = new Bundle();
        querySku.PutStringArrayList(BillingConstants.SkuDetailsItemList, ids);

        //NOTE: this is a blocking network call, so start a Task
        var skuDetails = await Task.Factory.StartNew(() => _connection.Service.GetSkuDetails(BillingConstants.ApiVersion, Application.Context.PackageName, BillingConstants.ItemTypeInApp, querySku));

        int response = skuDetails.GetInt(BillingConstants.ResponseCode);
        if (response != BillingConstants.ResultOk)
        {
            throw new Exception("GetSkuDetails failed, code: " + response);
        }

        var productsAsJson = skuDetails.GetStringArrayList(BillingConstants.SkuDetailsList);
        var products = new List<Purchase>(productsAsJson.Count);

        foreach (string json in productsAsJson)
        {
            var nativeProduct = JsonConvert.DeserializeObject<Product>(json);
            products.Add(new Purchase
            {
                Id = nativeProduct.ProductId,
                Price = nativeProduct.Price,
                NativeObject = nativeProduct,
            });
        }

        return products.ToArray();
    }
}