如何在Xamarin.Android中异步实现应用BillingClient中的Android

using Android.App;
using Android.OS;
using Android.Support.V7.App;
using Android.Widget;
using Xamarin.GooglePlayBilling;

namespace YourNamespace
{
    public class InAppBillingService
    {
        private BillingClient billingClient;

        public InAppBillingService(Activity activity)
        {
            billingClient = BillingClient.NewBuilder(activity)
                .SetListener(new BillingClientListener()) // 自定义的BillingClient监听器
                .Build();
        }

        // 其他方法和逻辑
    }
}

using System;
using Android.App;
using Xamarin.GooglePlayBilling;

namespace YourNamespace
{
    public class BillingClientListener : Java.Lang.Object, IBillingClientStateListener, IOnPurchasesUpdatedListener
    {
        public void OnBillingSetupFinished(BillingResult billingResult)
        {
            // 处理BillingClient初始化完成的回调
            if (billingResult.ResponseCode == BillingResponseCode.Ok)
            {
                // BillingClient初始化成功
            }
            else
            {
                // BillingClient初始化失败
            }
        }

        public void OnBillingServiceDisconnected()
        {
            // 处理BillingClient断开连接的回调
        }

        public void OnPurchasesUpdated(BillingResult billingResult, IList<Purchase> purchases)
        {
            // 处理购买流程的回调
            if (billingResult.ResponseCode == BillingResponseCode.Ok && purchases != null)
            {
                // 购买成功
            }
            else if (billingResult.ResponseCode == BillingResponseCode.UserCanceled)
            {
                // 用户取消购买
            }
            else
            {
                // 购买失败
            }
        }
    }
}

using Android.App;
using Android.Content;
using Xamarin.GooglePlayBilling;

namespace YourNamespace
{
    public class InAppBillingService
    {
        private BillingClient billingClient;

        public InAppBillingService(Activity activity)
        {
            billingClient = BillingClient.NewBuilder(activity)
                .SetListener(new BillingClientListener()) // 自定义的BillingClient监听器
                .Build();
        }

        public void StartConnection()
        {
            billingClient.StartConnection(new BillingClientListener());
        }

        public void PurchaseProduct(string productId)
        {
            var skuDetailsParams = SkuDetailsParams.NewBuilder()
                .SetType(BillingClient.SkuType.Inapp)
                .SetSkusList(new List<string> { productId })
                .Build();

            billingClient.QuerySkuDetailsAsync(skuDetailsParams, new SkuDetailsResponseListener());
        }

        // 其他方法和逻辑
    }
}

using Android.App;
using Android.OS;
using Android.Support.V7.App;
using Android.Widget;
using Xamarin.GooglePlayBilling;

namespace YourNamespace
{
    [Activity(Label = "YourApp", MainLauncher = true)]
    public class MainActivity : AppCompatActivity
    {
        private InAppBillingService inAppBillingService;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.activity_main);

            inAppBillingService = new InAppBillingService(this);
            inAppBillingService.StartConnection();

            // 其他代码和布局
        }

        protected override void OnDestroy()
        {
            base.OnDestroy();
            inAppBillingService.EndConnection();
        }
    }
}