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

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

// Load ads after you initialize MobileAds.
RewardedAd.load(
    new AdRequest.Builder(adUnitId).build(),
    new AdLoadCallback<RewardedAd>() {
      @Override
      public void onAdLoaded(@NonNull RewardedAd ad) {
        // Rewarded ad loaded.
        rewardedAd = ad;
      }

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

private fun showAd(rewardedAd: RewardedAd, activity: Activity) {
  // Show the ad.
  rewardedAd.show(
    activity,
    object : OnUserEarnedRewardListener {
      override fun onUserEarnedReward(rewardItem: RewardItem) {
        // User earned the reward.
        val rewardAmount = rewardItem.amount
        val rewardType = rewardItem.type
      }
    },
  )
}

private void showAd(RewardedAd rewardedAd, Activity activity) {
  // Show the ad.
  rewardedAd.show(
      activity,
      new OnUserEarnedRewardListener() {
        @Override
        public void onUserEarnedReward(@NonNull RewardItem rewardItem) {
          // User earned the reward.
          int rewardAmount = rewardItem.getAmount();
          String rewardType = rewardItem.getType();
        }
      });
}

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

  ad.adEventCallback =
    object : RewardedAdEventCallback {
      override fun onAdShowedFullScreenContent() {
        // Rewarded ad did show.
      }

      override fun onAdDismissedFullScreenContent() {
        // Rewarded ad did dismiss.
        rewardedAd = null
      }

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

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

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

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

  rewardedAd.setAdEventCallback(
      new RewardedAdEventCallback() {
        @Override
        public void onAdShowedFullScreenContent() {
          // Rewarded ad did show.
        }

        @Override
        public void onAdDismissedFullScreenContent() {
          // Rewarded ad did dismiss.
          rewardedAd = null;
        }

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

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

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