Xamarin.android 向Xamarin android应用程序添加奖励视频IsLoaded always return false_Xamarin.android_Admob_Rewardedvideoad

Xamarin.android 向Xamarin android应用程序添加奖励视频IsLoaded always return false

xamarin.android

Xamarin.android 向Xamarin android应用程序添加奖励视频IsLoaded always return false,xamarin.android,admob,rewardedvideoad,Xamarin.android,Admob,Rewardedvideoad,我正在尝试将奖励AdMob视频添加到我的应用程序onCreate中的代码为 Android.Gms.Ads.MobileAds.Initialize(ApplicationContext, "APP_CODE" ); mRewardedVideoAd = MobileAds.GetRewardedVideoAdInstance(this); mRewardedVideoAd.RewardedVideoAdListener = this; mRewardedVideoAd.LoadAd(@"ca-

我正在尝试将奖励AdMob视频添加到我的应用程序onCreate中的代码为

Android.Gms.Ads.MobileAds.Initialize(ApplicationContext, "APP_CODE" );
mRewardedVideoAd = MobileAds.GetRewardedVideoAdInstance(this);
mRewardedVideoAd.RewardedVideoAdListener = this;
mRewardedVideoAd.LoadAd(@"ca-app-pub-3940256099942544/5224354917",
                    new AdRequest.Builder().Build());

当我试图通过以下代码显示视频时

if (mRewardedVideoAd.IsLoaded)
                mRewardedVideoAd.Show();

mrewardvideoad.IsLoaded始终返回false

有什么解决办法吗