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// Load ads after you initialize MobileAds.
AppOpenAd.load(
  AdRequest.Builder(adUnitId).build(),
  object : AdLoadCallback<AppOpenAd> {
    override fun onAdLoaded(ad: AppOpenAd) {
      // App open ad loaded.
      appOpenAd = ad
    }

    override fun onAdFailedToLoad(adError: LoadAdError) {
      // App open ad failed to load.
      Log.e(TAG, "App open ad failed to load: ${adError.message}")
      appOpenAd = null
    }
  },
)

// Load ads after you initialize MobileAds.
AppOpenAd.load(
    new AdRequest.Builder(adUnitId).build(),
    new AdLoadCallback<AppOpenAd>() {
      @Override
      public void onAdLoaded(AppOpenAd ad) {
        // App open ad loaded.
        appOpenAd = ad;
      }

      @Override
      public void onAdFailedToLoad(LoadAdError adError) {
        // App open ad failed to load.
        Log.e(TAG, "App open ad failed to load: " + adError.getMessage());
        appOpenAd = null;
      }
    });

private fun showAd(appOpenAd: AppOpenAd, activity: Activity) {
  // Show the ad.
  appOpenAd.show(activity)
}

private void showAd(AppOpenAd appOpenAd, Activity activity) {
  // Show the ad.
  appOpenAd.show(activity);
}

private fun listenToAdEvents() {
  // Listen for ad events.
  val ad = appOpenAd
  if (ad == null) {
    Log.e(TAG, "App open ad is not ready yet.")
    return
  }

  ad.adEventCallback =
    object : AppOpenAdEventCallback {
      override fun onAdShowedFullScreenContent() {
        // App open ad did show.
      }

      override fun onAdDismissedFullScreenContent() {
        // App open ad did dismiss.
        appOpenAd = null
      }

      override fun onAdFailedToShowFullScreenContent(
        fullScreenContentError: FullScreenContentError
      ) {
        // App open ad failed to show.
        Log.e(TAG, "App open ad failed to show: ${fullScreenContentError.message}")
      }

      override fun onAdImpression() {
        // App open ad did record an impression.
      }

      override fun onAdClicked() {
        // App open ad did record a click.
      }
    }
}

private void listenToAdEvents() {
  // Listen for ad events.
  if (appOpenAd == null) {
    Log.e(TAG, "App open ad is not ready yet.");
    return;
  }

  appOpenAd.setAdEventCallback(
      new AppOpenAdEventCallback() {
        @Override
        public void onAdShowedFullScreenContent() {
          // App open ad did show.
        }

        @Override
        public void onAdDismissedFullScreenContent() {
          // App open ad did dismiss.
          appOpenAd = null;
        }

        @Override
        public void onAdFailedToShowFullScreenContent(
            @NonNull FullScreenContentError fullScreenContentError) {
          // App open ad failed to show.
          Log.e(TAG, "App open ad failed to show: " + fullScreenContentError.getMessage());
        }

        @Override
        public void onAdImpression() {
          // App open ad did record an impression.
        }

        @Override
        public void onAdClicked() {
          // App open ad did record a click.
        }
      });
}