implement native ads in a multi view holder infinite scrolling list using paging

native_ads_view_holder.kt

class NativeAdViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView){

    private val adsArr = listOf("native ads id here 1", "native ads id here 2", "native ads id here 3")
    private var adsCnt = 3

    init {
      
            loadAds()
     
    }

    private fun loadAds(){
        val randomInteger = (0..2).shuffled().first()
        val adLoader = AdLoader.Builder(itemView.context, adsArr[randomInteger])
            .forUnifiedNativeAd { ad : UnifiedNativeAd ->
                // val template: TemplateView  = itemView.findViewById(R.id.my_template)
                // template.setNativeAd(ad)
//                val adView = itemView as UnifiedNativeAdView
//                populateUnifiedNativeAdView(ad, adView)
//                val typedValue = TypedValue()
//                val theme: Resources.Theme = itemView.context.getTheme()
//                theme.resolveAttribute(R.attr.backgroundColor, typedValue, true)
//                @ColorInt val color: Int = typedValue.data
//                val styles = NativeTemplateStyle.Builder().withMainBackgroundColor(ColorDrawable(color)).build()
                val styles = NativeTemplateStyle.Builder().build()

                val template: TemplateView = itemView.findViewById(R.id.my_template)
                template.setStyles(styles)
                template.setNativeAd(ad)
            }
            .withAdListener(object : AdListener() {
                override fun onAdFailedToLoad(errorCode: Int) {
                    // Handle the failure by logging, altering the UI, and so on.
                    if(adsCnt > 0) {
                        loadAds()
                    }
                    else {
                        adsCnt-=1
                    }
                }
            })
            .withNativeAdOptions(
                NativeAdOptions.Builder()
                    // Methods in the NativeAdOptions.Builder class can be
                    // used here to specify individual options settings.
                    .build())
            .build()
        adLoader.loadAd(AdRequest.Builder().build())
    }

    /**
     * Populates a [UnifiedNativeAdView] object with data from a given
     * [UnifiedNativeAd].
     *
     * @param nativeAd the object containing the ad's assets
     * @param adView the view to be populated
     */
    private fun populateUnifiedNativeAdView(nativeAd: UnifiedNativeAd, adView: UnifiedNativeAdView) {
        // Set the media view.
        adView.mediaView = adView.findViewById(R.id.ad_media)

        // Set other ad assets.
        adView.headlineView = adView.findViewById(R.id.ad_headline)
        adView.bodyView = adView.findViewById(R.id.ad_body)
        adView.callToActionView = adView.findViewById(R.id.ad_call_to_action)
        adView.iconView = adView.findViewById(R.id.ad_app_icon)
        adView.priceView = adView.findViewById(R.id.ad_price)
        adView.starRatingView = adView.findViewById(R.id.ad_stars)
        adView.storeView = adView.findViewById(R.id.ad_store)
        adView.advertiserView = adView.findViewById(R.id.ad_advertiser)

        // The headline and media content are guaranteed to be in every UnifiedNativeAd.
        (adView.headlineView as TextView).text = nativeAd.headline
        adView.mediaView.setMediaContent(nativeAd.mediaContent)

        // These assets aren't guaranteed to be in every UnifiedNativeAd, so it's important to
        // check before trying to display them.
        if (nativeAd.body == null) {
            adView.bodyView.visibility = View.INVISIBLE
        } else {
            adView.bodyView.visibility = View.VISIBLE
            (adView.bodyView as TextView).text = nativeAd.body
        }

        if (nativeAd.callToAction == null) {
            adView.callToActionView.visibility = View.INVISIBLE
        } else {
            adView.callToActionView.visibility = View.VISIBLE
            (adView.callToActionView as Button).text = nativeAd.callToAction
        }

        if (nativeAd.icon == null) {
            adView.iconView.visibility = View.GONE
        } else {
            (adView.iconView as ImageView).setImageDrawable(
                nativeAd.icon.drawable)
            adView.iconView.visibility = View.VISIBLE
        }

        if (nativeAd.price == null) {
            adView.priceView.visibility = View.INVISIBLE
        } else {
            adView.priceView.visibility = View.VISIBLE
            (adView.priceView as TextView).text = nativeAd.price
        }

        if (nativeAd.store == null) {
            adView.storeView.visibility = View.INVISIBLE
        } else {
            adView.storeView.visibility = View.VISIBLE
            (adView.storeView as TextView).text = nativeAd.store
        }

        if (nativeAd.starRating == null) {
            adView.starRatingView.visibility = View.INVISIBLE
        } else {
            (adView.starRatingView as RatingBar).rating = nativeAd.starRating!!.toFloat()
            adView.starRatingView.visibility = View.VISIBLE
        }

        if (nativeAd.advertiser == null) {
            adView.advertiserView.visibility = View.INVISIBLE
        } else {
            (adView.advertiserView as TextView).text = nativeAd.advertiser
            adView.advertiserView.visibility = View.VISIBLE
        }

        // This method tells the Google Mobile Ads SDK that you have finished populating your
        // native ad view with this native ad.
        adView.setNativeAd(nativeAd)

        // Get the video controller for the ad. One will always be provided, even if the ad doesn't
        // have a video asset.
        val vc = nativeAd.videoController

        // Updates the UI to say whether or not this ad has a video asset.
       if (vc.hasVideoContent()) {
//            videostatus_text.text = String.format(
//                Locale.getDefault(),
//                "Video status: Ad contains a %.2f:1 video asset.",
//                vc.aspectRatio)
//
//            // Create a new VideoLifecycleCallbacks object and pass it to the VideoController. The
//            // VideoController will call methods on this object when events occur in the video
//            // lifecycle.
            vc.videoLifecycleCallbacks = object : VideoController.VideoLifecycleCallbacks() {
                override fun onVideoEnd() {
                    // Publishers should allow native ads to complete video playback before
                    // refreshing or replacing them with another ad in the same UI location.
                    //refresh_button.isEnabled = true
                   // videostatus_text.text = "Video status: Video playback has ended."
                    super.onVideoEnd()
                }
            }
        }
//       else {
//            videostatus_text.text = "Video status: Ad does not contain a video asset."
//            refresh_button.isEnabled = true
//        }
    }

}