使用 Xamarin.Forms (Plugin.InAppBilling) 检查可更新订阅是否处于活动状态

Question

我有一个带有一些可更新订阅的 Xamarin.Forms 应用程序。我正在使用InAppBilling plugin 购买这些订阅。现在我的问题是：（我已经在this post 中问过）如何检查可更新订阅是否有效？提前致谢。

Answer 1

通过document，您可以通过以下方式查看状态

var connected = await billing.ConnectAsync(ItemType.Subscription);:

示例如下：

public async Task<bool> PurchaseItem(string productId, string payload)
{
    var billing = CrossInAppBilling.Current;
    try
    {
        var connected = await billing.ConnectAsync(ItemType.InAppPurchase);
        if (!connected)
        {
            //we are offline or can't connect, don't try to purchase
            return false;
        }

        //check purchases
        var purchase = await billing.PurchaseAsync(productId, ItemType.InAppPurchase, payload);

        //possibility that a null came through.
        if(purchase == null)
        {
            //did not purchase
        }
        else if(purchase.State == PurchaseState.Purchased)
        {
            //purchased!
            
        }
    }
    catch (InAppBillingPurchaseException purchaseEx)
    {
        //Billing Exception handle this based on the type
        Debug.WriteLine("Error: " + purchaseEx);
    }
    catch (Exception ex)
    {
        //Something else has gone wrong, log it
        Debug.WriteLine("Issue connecting: " + ex);
    }
    finally
    {
        await billing.DisconnectAsync();
    }