Rewarded Interstitial Ads

Select platform: Android iOS Unity Flutter

Rewarded interstitial is a type of incentivized ad format that lets you offer rewards for ads that appear automatically during natural app transitions. Unlike rewarded ads, users aren't required to opt-in to view a rewarded interstitial. This guide shows how to integrate rewarded interstitial ads from Ad Manager into a Flutter app.

Prerequisites

  • Flutter plugin 1.1.0 or higher.
  • Complete Get Started. Your Flutter app should already have the Google Mobile Ads Flutter plugin imported.

Always test with test ads

When building and testing your apps, make sure you use test ads rather than live, production ads. Failure to do so can lead to suspension of your account.

The easiest way to load test ads is to use our dedicated test ad unit ID for rewarded interstitial ads:

  • /21775744923/example/rewarded-interstitial

The test ad units are configured to return test ads for every request, and you're free to use them in your own apps while coding, testing, and debugging. Just make sure you replace them with your own ad unit IDs before publishing your app.

Load an ad

The following example loads a rewarded interstitial ad:

RewardedInterstitialAd.load(
  adUnitId: "_adUnitId",
  request: const AdManagerAdRequest(),
  rewardedInterstitialAdLoadCallback: RewardedInterstitialAdLoadCallback(
    onAdLoaded: (RewardedInterstitialAd ad) {
      // Called when an ad is successfully received.
      debugPrint('Ad was loaded.');
      // Keep a reference to the ad so you can show it later.
      _rewardedInterstitialAd = ad;
    },
    onAdFailedToLoad: (LoadAdError error) {
      // Called when an ad request failed.
      debugPrint('Ad failed to load with error: $error');
    },
  ),
);
rewarded_interstitial_ad_snippets.dart

Replace _adUnitId with your own ad unit ID.

Rewarded interstitial ad events

Through the use of FullScreenContentCallback, you can listen for lifecycle events, such as when the ad is shown or dismissed. Set RewardedInterstitialAd.fullScreenContentCallback before showing the ad to receive notifications for these events. This example implements each method and logs a message to the console:

ad.fullScreenContentCallback = FullScreenContentCallback(
  onAdShowedFullScreenContent: (ad) {
    // Called when the ad showed the full screen content.
    debugPrint('Ad showed full screen content.');
  },
  onAdFailedToShowFullScreenContent: (ad, err) {
    // Called when the ad failed to show full screen content.
    debugPrint('Ad failed to show full screen content with error: $err');
    // Dispose the ad here to free resources.
    ad.dispose();
  },
  onAdDismissedFullScreenContent: (ad) {
    // Called when the ad dismissed full screen content.
    debugPrint('Ad was dismissed.');
    // Dispose the ad here to free resources.
    ad.dispose();
  },
  onAdImpression: (ad) {
    // Called when an impression occurs on the ad.
    debugPrint('Ad recorded an impression.');
  },
  onAdClicked: (ad) {
    // Called when a click is recorded for an ad.
    debugPrint('Ad was clicked.');
  },
);
rewarded_interstitial_ad_snippets.dart

Display ad

A RewardedInterstitialAd is displayed as an Overlay on top of all app content and is statically placed; thus, it can't be added to the Flutter widget tree. You can choose when to show the ad by calling show(). RewardedInterstitialAd.show() takes an OnUserEarnedRewardCallback, which is invoked when the user earns a reward. Be sure to implement this and reward the user for watching an ad.

_rewardedInterstitialAd?.show(
  onUserEarnedReward: (AdWithoutView view, RewardItem rewardItem) {
    debugPrint('Reward amount: ${rewardItem.amount}');
  },
);
main.dart

Once show() is called, an Ad displayed this way can't be removed programmatically and requires user input. A RewardedInterstitialAd can only be shown once. Subsequent calls to show will trigger onAdFailedToShowFullScreenContent.

An ad must be disposed when access to it is no longer needed. The best practice for when to call dispose() is in the FullScreenContentCallback.onAdDismissedFullScreenContent and FullScreenContentCallback.onAdFailedToShowFullScreenContent callbacks.

[Optional] Validate server-side verification (SSV) callbacks

Apps that require extra data in server-side verification callbacks should use the custom data feature of rewarded ads. Any string value set on a rewarded ad object is passed to the custom_data query parameter of the SSV callback. If no custom data value is set, the custom_data query parameter value won't be present in the SSV callback.

The following code sample demonstrates how to set the SSV options after the rewarded interstitial ad is loaded:

RewardedInterstitialAd.load(
  adUnitId: "_adUnitId",
  request: AdManagerAdRequest(),
  rewardedInterstitialAdLoadCallback: RewardedInterstitialAdLoadCallback(
    onAdLoaded: (ad) {
      ServerSideVerificationOptions _options =
          ServerSideVerificationOptions(
              customData: 'SAMPLE_CUSTOM_DATA_STRING');
      ad.setServerSideOptions(_options);
      _rewardedInterstitialAd = ad;
    },
    onAdFailedToLoad: (error) {},
  ),
);
rewarded_interstitial_ad_snippets.dart

Replace SAMPLE_CUSTOM_DATA_STRING with your custom data.