Plugin.InAppBilling：确认 Android 购买

我Plugin.InAppBilling在我的 MAUI 应用程序中使用它进行订阅。对于 Android 部分，我需要在成功购买后进行确认。

选项 1：ConsumePurchaseAsync

if (DeviceInfo.Platform == DevicePlatform.Android)
{
    var consumed = await CrossInAppBilling.Current.ConsumePurchaseAsync(productId, purchase.PurchaseToken);
    if (!consumed)
    {
        Debug.WriteLine("Purchase consumption/acknowledgment failed");
        return;
    }
    Debug.WriteLine("Purchase acknowledged successfully");
}

但我遇到了以下异常：

16:05:10:848    [0:] purchaseEx:>>Plugin.InAppBilling.InAppBillingPurchaseException: Unable to process purchase.
16:05:10:848       at Plugin.InAppBilling.InAppBillingImplementation.ParseBillingResult(BillingResult result, Boolean ignoreInvalidProducts)
16:05:10:848       at Plugin.InAppBilling.InAppBillingImplementation.ConsumePurchaseAsync(String productId, String transactionIdentifier)
16:05:10:848       at MyProjectName.Pages.ListPlansPage.PlanClicked(Object sender, EventArgs e) in E:\My Projects\MAUI
16:05:10:848    eedhelp-app-maui\MyProjectName\Pages\Subscription\ListPlansPage.xaml.cs:line 371
16:05:10:909    The thread 25 has exited with code 0 (0x0).

以下行存在异常：

var consumed = await CrossInAppBilling.Current.ConsumePurchaseAsync(productId, purchase.PurchaseToken);

选项 2：DependencyService

创建了一个接口：IPurchaseAcknowledgment

public interface IPurchaseAcknowledgment
{
    Task<bool> AcknowledgePurchaseAsync(string purchaseToken);
}

实施IPurchaseAcknowledgment日期MainActivity：

public class MainActivity : MauiAppCompatActivity, IPurchaseAcknowledgment
{
    /// <summary>
    /// Acknowledge purchase using Google Play BillingClient
    /// </summary>
    public async Task<bool> AcknowledgePurchaseAsync(string purchaseToken)
    {
        var billingClient = BillingClient.NewBuilder(Android.App.Application.Context)
            .SetListener(new PurchaseUpdateListener()) // You can implement your own listener if needed
            .EnablePendingPurchases()
            .Build();

        // Connect to the BillingClient
        var billingConnectionTaskCompletionSource = new TaskCompletionSource<BillingResult>();
        billingClient.StartConnection(new BillingClientStateListener(
            onBillingSetupFinished: billingResult => billingConnectionTaskCompletionSource.SetResult(billingResult),
            onBillingServiceDisconnected: () => billingConnectionTaskCompletionSource.SetException(new System.Exception("Billing service disconnected"))
        ));

        var connectionResult = await billingConnectionTaskCompletionSource.Task;
        if (connectionResult.ResponseCode != BillingResponseCode.Ok)
        {
            return false; // Connection failed
        }

        // Acknowledge the purchase
        var acknowledgeParams = AcknowledgePurchaseParams.NewBuilder()
            .SetPurchaseToken(purchaseToken)
            .Build();

        var acknowledgeTaskCompletionSource = new TaskCompletionSource<BillingResult>();
        billingClient.AcknowledgePurchase(acknowledgeParams, new AcknowledgePurchaseResponseListener(
            result => acknowledgeTaskCompletionSource.SetResult(result)
        ));

        var acknowledgeResult = await acknowledgeTaskCompletionSource.Task;

        // End connection
        billingClient.EndConnection();

        return acknowledgeResult.ResponseCode == BillingResponseCode.Ok;
    }

    /// <summary>
    /// Listener for purchase updates (can be extended if required)
    /// </summary>
    private class PurchaseUpdateListener : Java.Lang.Object, IPurchasesUpdatedListener
    {
        public void OnPurchasesUpdated(BillingResult billingResult, IList<Purchase> purchases)
        {
            // Handle purchase updates here if needed
        }
    }

    /// <summary>
    /// Listener for billing client state
    /// </summary>
    private class BillingClientStateListener : Java.Lang.Object, IBillingClientStateListener
    {
        private readonly System.Action<BillingResult> onBillingSetupFinished;
        private readonly System.Action onBillingServiceDisconnected;

        public BillingClientStateListener(System.Action<BillingResult> onBillingSetupFinished, System.Action onBillingServiceDisconnected)
        {
            this.onBillingSetupFinished = onBillingSetupFinished;
            this.onBillingServiceDisconnected = onBillingServiceDisconnected;
        }

        public void OnBillingSetupFinished(BillingResult billingResult)
        {
            onBillingSetupFinished?.Invoke(billingResult);
        }

        public void OnBillingServiceDisconnected()
        {
            onBillingServiceDisconnected?.Invoke();
        }
    }

    /// <summary>
    /// Listener for acknowledge purchase response
    /// </summary>
    private class AcknowledgePurchaseResponseListener : Java.Lang.Object, IAcknowledgePurchaseResponseListener
    {
        private readonly System.Action<BillingResult> onAcknowledgeResponse;

        public AcknowledgePurchaseResponseListener(System.Action<BillingResult> onAcknowledgeResponse)
        {
            this.onAcknowledgeResponse = onAcknowledgeResponse;
        }

        public void OnAcknowledgePurchaseResponse(BillingResult billingResult)
        {
            onAcknowledgeResponse?.Invoke(billingResult);
        }
    }
}

购买计划后最终结果：

if (DeviceInfo.Platform == DevicePlatform.Android)
{
    var acknowledgmentService = DependencyService.Get<IPurchaseAcknowledgment>();
    var acknowledged = await acknowledgmentService.AcknowledgePurchaseAsync(purchase.PurchaseToken);

    if (!acknowledged)
    {
        Debug.WriteLine("Purchase acknowledgment failed");
        return;
    }
    Debug.WriteLine("Purchase acknowledged successfully");
}

但出现以下异常：

16:23:24:835    [0:] exception:>>System.NullReferenceException: Object reference not set to an instance of an object.
16:23:24:835       at MyProjectName.Pages.ListPlansPage.PlanClicked(Object sender, EventArgs e) in E:\My Projects\MAUI
16:23:24:835    eedhelp-app-maui\MyProjectName\Pages\Subscription\ListPlansPage.xaml.cs:line 383

以下行存在异常：

var acknowledged = await acknowledgmentService.AcknowledgePurchaseAsync(purchase.PurchaseToken);

还有其他解决办法吗？

更新

我尝试如下：

var consumed = await CrossInAppBilling.Current.ConsumePurchaseAsync(purchase.ProductId, purchase.TransactionIdentifier);

但出现以下异常：

12:43:02:766    [0:] purchaseEx:>>Plugin.InAppBilling.InAppBillingPurchaseException: Unable to process purchase.
12:43:02:766       at Plugin.InAppBilling.InAppBillingImplementation.ParseBillingResult(BillingResult result, Boolean ignoreInvalidProducts)
12:43:02:766       at Plugin.InAppBilling.InAppBillingImplementation.ConsumePurchaseAsync(String productId, String transactionIdentifier)
12:43:02:766       at MyProjectName.Pages.ListPlansPage.PlanClicked(Object sender, EventArgs e) in E:\My Projects\MAUI
12:43:02:766    eedhelp-app-maui\MyProjectName\Pages\Subscription\ListPlansPage.xaml.cs:line 372