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如何在 Xamarin.Android 中实现 RewardedAdLoadCallback？

分类：编程问答

如何解决如何在 Xamarin.Android 中实现 RewardedAdLoadCallback？

我正在尝试使用 C# 在 Xamarin.Android 中实现激励广告。

Android 文档中的代码片段是用 Java 编写的，通常我在 C# 中采用该代码没有太大问题，但现在似乎确实有问题。

要在 Java 中加载 RewardedAd，您必须执行以下操作 (according to the official documentation)：

AdRequest adRequest = new AdRequest.Builder().build();

RewardedAd.load(this,"ca-app-pub-3940256099942544/5224354917",adRequest,new RewardedAdLoadCallback(){
        @Override
        public void onAdFailedToLoad(@NonNull LoadAdError loadAdError) {
          // Handle the error.
          Log.d(TAG,loadAdError.getMessage());
          mRewardedAd = null
        }

        @Override
        public void onAdLoaded(@NonNull RewardedAd rewardedAd) {
          mRewardedAd = rewardedAd;
          Log.d(TAG,"onAdFailedToLoad");
        }
    });

现在这里的问题是在这段代码中传递的对象RewardedAdLoadCallback，也定义了方法的实现（onAdFailedToLoad和onAdLoaded），而在C#中这是做不到的。

>

所以我的解决方案是创建我自己的类 MyRewardedAdLoadCallback，并覆盖这些方法。

public class MyRewardedAdLoadCallback : RewardedAdLoadCallback
{
    public override void OnAdLoaded(java.lang.Object p0)
    {
        base.OnAdLoaded(p0);
    }

    public override void OnAdFailedToLoad(LoadAdError p0)
    {
        base.OnAdFailedToLoad(p0);
    }
}

然后我只需使用以下代码加载激励广告：

AdRequest adRequest = new AdRequest.Builder().Build();

RewardedAd.Load(this,new MyRewardedAdLoadCallback());

现在由于一些奇怪的原因，我在构建项目时收到此错误：

error: name clash: onAdLoaded(Object) in MyRewardedAdLoadCallback and onAdLoaded(AdT) in AdLoadCallback have the same erasure,yet neither overrides the other
    public void onAdLoaded (java.lang.Object p0)
  where AdT is a type-variable:
    AdT extends Object declared in class AdLoadCallback

我尝试在 Internet 上搜索此错误并得出结论，这是一个 Java 错误并且与泛型类型有关（请参阅 this SO 问题）。但是，我在我的代码中以及有关激励广告的 Android 文档中都没有看到任何通用类型。关于我尝试实施的激励广告的 Xamarin 文档也为零。

如果有人能帮我解决这个问题，我会很高兴。提前致谢。

解决方法

这是在 Xamarin.GooglePlayServices.Ads 版本 120.0.0 中同时使用插页式广告和激励式广告的技巧。

将以下文件添加到您的项目中（需要使用 unsafe 标志进行构建）并使用 Android.Gms.Ads.Hack 命名空间加载您的广告并将您的回调子类化。

例如，InterstitialAd.Load 变为 global::Android.Gms.Ads.Hack.InterstitialAd.Load，InterstitialAdLoadCallback 变为 global::Android.Gms.Ads.Hack.InterstitialAdLoadCallback。

回调类分别将 OnInterstitialAdLoaded() 和 OnRewardedAdLoaded() 虚拟方法添加到插页式和奖励广告加载回调。

using System;
using System.ComponentModel;
using System.Diagnostics;
using Android.Content;
using Android.Runtime;
using Java.Interop;

namespace Android.Gms.Ads.Hack
{
    public abstract class InterstitialAd : Java.Lang.Object
    {
        private static readonly JniPeerMembers _members = new XAPeerMembers("com/google/android/gms/ads/interstitial/InterstitialAd",typeof(InterstitialAd));

        public unsafe static void Load(Context context,string adUnit,AdRequest request,AdLoadCallback callback)
        {
            IntPtr intPtr = JNIEnv.NewString(adUnit);
            try
            {
                JniArgumentValue* ptr = stackalloc JniArgumentValue[4];
                *ptr = new JniArgumentValue(context?.Handle ?? IntPtr.Zero);
                ptr[1] = new JniArgumentValue(intPtr);
                ptr[2] = new JniArgumentValue(request?.Handle ?? IntPtr.Zero);
                ptr[3] = new JniArgumentValue(callback?.Handle ?? IntPtr.Zero);
                _members.StaticMethods.InvokeVoidMethod("load.(Landroid/content/Context;Ljava/lang/String;Lcom/google/android/gms/ads/AdRequest;Lcom/google/android/gms/ads/interstitial/InterstitialAdLoadCallback;)V",ptr);
            }
            finally
            {
                JNIEnv.DeleteLocalRef(intPtr);
                GC.KeepAlive(context);
                GC.KeepAlive(request);
                GC.KeepAlive(callback);
            }
        }
    }

    [Register("com/google/android/gms/ads/interstitial/InterstitialAdLoadCallback",DoNotGenerateAcw = true)]
    public abstract class InterstitialAdLoadCallback : AdLoadCallback
    {
        private static readonly JniPeerMembers _members = new XAPeerMembers("com/google/android/gms/ads/interstitial/InterstitialAdLoadCallback",typeof(InterstitialAdLoadCallback));

        static IntPtr class_ref => _members.JniPeerType.PeerReference.Handle;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
        [EditorBrowsable(EditorBrowsableState.Never)]
        public override JniPeerMembers JniPeerMembers => _members;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
        [EditorBrowsable(EditorBrowsableState.Never)]
        protected override IntPtr ThresholdClass => _members.JniPeerType.PeerReference.Handle;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
        [EditorBrowsable(EditorBrowsableState.Never)]
        protected override Type ThresholdType => _members.ManagedPeerType;

        protected InterstitialAdLoadCallback(IntPtr javaReference,JniHandleOwnership transfer)
            : base(javaReference,transfer)
        {
        }

        [Register(".ctor","()V","")]
        public unsafe InterstitialAdLoadCallback()
            : base(IntPtr.Zero,JniHandleOwnership.DoNotTransfer)
        {
            if (!(base.Handle != IntPtr.Zero))
            {
                SetHandle(_members.InstanceMethods.StartCreateInstance("()V",GetType(),null).Handle,JniHandleOwnership.TransferLocalRef);
                _members.InstanceMethods.FinishCreateInstance("()V",this,null);
            }
        }

        private static Delegate cb_onAdLoaded;

        private static Delegate GetOnAdLoadedHandler()
        {
            if (cb_onAdLoaded is null)
            {
                cb_onAdLoaded = JNINativeWrapper.CreateDelegate((Action<IntPtr,IntPtr,IntPtr>)n_onAdLoaded);
            }

            return cb_onAdLoaded;
        }

        private static void n_onAdLoaded(IntPtr jnienv,IntPtr native__this,IntPtr native_p0)
        {
            InterstitialAdLoadCallback? @object = Java.Lang.Object.GetObject<InterstitialAdLoadCallback>(jnienv,native__this,JniHandleOwnership.DoNotTransfer);
            global::Android.Gms.Ads.Interstitial.InterstitialAd object2 = Java.Lang.Object.GetObject<global::Android.Gms.Ads.Interstitial.InterstitialAd>(native_p0,JniHandleOwnership.DoNotTransfer);
            @object!.OnInterstitialAdLoaded(object2);
        }

        [Register("onAdLoaded","(Lcom/google/android/gms/ads/interstitial/InterstitialAd;)V","GetOnAdLoadedHandler")]
        public virtual void OnInterstitialAdLoaded(global::Android.Gms.Ads.Interstitial.InterstitialAd interstitialAd)
        {
        }
    }

    public abstract class RewardedAd : Java.Lang.Object
    {
        private static readonly JniPeerMembers _members = new XAPeerMembers("com/google/android/gms/ads/rewarded/RewardedAd",typeof(RewardedAd));

        public unsafe static void Load(Context context,RewardedAdLoadCallback callback)
        {
            IntPtr intPtr = JNIEnv.NewString(adUnit);
            try
            {
                JniArgumentValue* ptr = stackalloc JniArgumentValue[4];
                *ptr = new JniArgumentValue(context?.Handle ?? IntPtr.Zero);
                ptr[1] = new JniArgumentValue(intPtr);
                ptr[2] = new JniArgumentValue(request?.Handle ?? IntPtr.Zero);
                ptr[3] = new JniArgumentValue(callback?.Handle ?? IntPtr.Zero);
                _members.StaticMethods.InvokeVoidMethod("load.(Landroid/content/Context;Ljava/lang/String;Lcom/google/android/gms/ads/AdRequest;Lcom/google/android/gms/ads/rewarded/RewardedAdLoadCallback;)V",ptr);
            }
            finally
            {
                JNIEnv.DeleteLocalRef(intPtr);
                GC.KeepAlive(context);
                GC.KeepAlive(request);
                GC.KeepAlive(callback);
            }
        }
    }

    [Register("com/google/android/gms/ads/rewarded/RewardedAdLoadCallback",DoNotGenerateAcw = true)]
    public abstract class RewardedAdLoadCallback : AdLoadCallback
    {
        private static readonly JniPeerMembers _members = new XAPeerMembers("com/google/android/gms/ads/rewarded/RewardedAdLoadCallback",typeof(RewardedAdLoadCallback));

        static IntPtr class_ref => _members.JniPeerType.PeerReference.Handle;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
        [EditorBrowsable(EditorBrowsableState.Never)]
        public override JniPeerMembers JniPeerMembers => _members;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
        [EditorBrowsable(EditorBrowsableState.Never)]
        protected override IntPtr ThresholdClass => _members.JniPeerType.PeerReference.Handle;

        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
        [EditorBrowsable(EditorBrowsableState.Never)]
        protected override Type ThresholdType => _members.ManagedPeerType;

        protected RewardedAdLoadCallback(IntPtr javaReference,"")]
        public unsafe RewardedAdLoadCallback()
            : base(IntPtr.Zero,IntPtr native_p0)
        {
            RewardedAdLoadCallback? @object = Java.Lang.Object.GetObject<RewardedAdLoadCallback>(jnienv,JniHandleOwnership.DoNotTransfer);
            global::Android.Gms.Ads.Rewarded.RewardedAd object2 = Java.Lang.Object.GetObject<global::Android.Gms.Ads.Rewarded.RewardedAd>(native_p0,JniHandleOwnership.DoNotTransfer);
            @object!.OnRewardedAdLoaded(object2);
        }

        [Register("onAdLoaded","(Lcom/google/android/gms/ads/rewarded/RewardedAd;)V","GetOnAdLoadedHandler")]
        public virtual void OnRewardedAdLoaded(global::Android.Gms.Ads.Rewarded.RewardedAd rewardedAd)
        {
        }
    }
}
, 
public abstract class InterstitialCallback : Android.Gms.Ads.Interstitial.InterstitialAdLoadCallback
{
    [Register("onAdLoaded","GetOnAdLoadedHandler")]
    public virtual void OnAdLoaded(Android.Gms.Ads.Interstitial.InterstitialAd interstitialAd)
    {
    }

    private static Delegate cb_onAdLoaded;
    private static Delegate GetOnAdLoadedHandler()
    {
        if (cb_onAdLoaded is null)
            cb_onAdLoaded = JNINativeWrapper.CreateDelegate((Action<IntPtr,IntPtr>)n_onAdLoaded);
        return cb_onAdLoaded;
    }
    private static void n_onAdLoaded(IntPtr jnienv,IntPtr native_p0)
    {
        InterstitialCallback thisobject = GetObject<InterstitialCallback>(jnienv,JniHandleOwnership.DoNotTransfer);
        Android.Gms.Ads.Interstitial.InterstitialAd resultobject = GetObject<Android.Gms.Ads.Interstitial.InterstitialAd>(native_p0,JniHandleOwnership.DoNotTransfer);
        thisobject.OnAdLoaded(resultobject);
    }
}
public abstract class RewardedAdLoadCallback : Android.Gms.Ads.Rewarded.RewardedAdLoadCallback
{
    [Register("onAdLoaded","GetOnAdLoadedHandler")]
    public virtual void OnAdLoaded(Android.Gms.Ads.Rewarded.RewardedAd rewardedAd)
    {
    }

    private static Delegate cb_onAdLoaded;
    private static Delegate GetOnAdLoadedHandler()
    {
        if (cb_onAdLoaded is null)
        {
            cb_onAdLoaded = JNINativeWrapper.CreateDelegate((Action<IntPtr,IntPtr>)n_onAdLoaded);
        }

        return cb_onAdLoaded;
    }
    private static void n_onAdLoaded(IntPtr jnienv,IntPtr native_p0)
    {
        RewardedAdLoadCallback thisobject = GetObject<RewardedAdLoadCallback>(jnienv,JniHandleOwnership.DoNotTransfer);
        Android.Gms.Ads.Rewarded.RewardedAd resultobject = GetObject<Android.Gms.Ads.Rewarded.RewardedAd>(native_p0,JniHandleOwnership.DoNotTransfer);
        thisobject.OnAdLoaded(resultobject);
    }
}
,

也许只是将回调子类化

class RewardedVideoAds : RewardedAdLoadCallback
    {
        private RewardedAd rewardedAd;

        
        public RewardedVideoAds()
        {
            
            AdRequest adRequest = new AdRequest.Builder().Build();
           
            RewardedAd.Load(MainActivity.Current,"ca-app-pub-3940256099942544/5224354917",adRequest,this);
        }
        public override void OnAdFailedToLoad(LoadAdError p0)
        {
            base.OnAdFailedToLoad(p0);
        }
        public override void OnAdLoaded(Java.Lang.Object p0)
        {
            base.OnAdLoaded(p0);
        }
    }

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