public void OnAdLoaded(IAd ad)
        {
            Android.Util.Log.Debug(TAG, "Native Ad Loaded");

            if (ad != nativeAd)
            {
                return;
            }

            // Add ad into the ad container.
            nativeAdContainer = FindViewById <LinearLayout> (Resource.Id.native_ad_container);

            var inflater = LayoutInflater.From(this);

            adView = (LinearLayout)inflater.Inflate(Resource.Layout.NativeAdView, nativeAdContainer, false);
            nativeAdContainer.AddView(adView);

            // Create native UI using the ad metadata.
            var nativeAdIcon          = adView.FindViewById <ImageView> (Resource.Id.native_ad_icon);
            var nativeAdTitle         = adView.FindViewById <TextView> (Resource.Id.native_ad_title);
            var nativeAdBody          = adView.FindViewById <TextView> (Resource.Id.native_ad_body);
            var nativeAdMedia         = adView.FindViewById <MediaView> (Resource.Id.native_ad_media);
            var nativeAdSocialContext = adView.FindViewById <TextView> (Resource.Id.native_ad_social_context);
            var nativeAdCallToAction  = adView.FindViewById <Button> (Resource.Id.native_ad_call_to_action);

            // Setting the Text.
            nativeAdSocialContext.Text = nativeAd.AdSocialContext;
            nativeAdCallToAction.Text  = nativeAd.AdCallToAction;
            nativeAdTitle.Text         = nativeAd.AdTitle;
            nativeAdBody.Text          = nativeAd.AdBody;

            // Downloading and setting the ad icon.
            var adIcon = nativeAd.AdIcon;

            NativeAd.DownloadAndDisplayImage(adIcon, nativeAdIcon);

            // Download and setting the cover image.
            var adCoverImage = nativeAd.AdCoverImage;

            nativeAdMedia.SetNativeAd(nativeAd);

            // Add adChoices icon
            if (adChoicesView == null)
            {
                adChoicesView = new AdChoicesView(this, nativeAd, true);
                adView.AddView(adChoicesView, 0);
            }

            nativeAd.RegisterViewForInteraction(adView);
        }