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插页式激励广告（Beta 版）

插页式激励广告是一种激励用户的广告格式，奖励自动应用。与激励广告不同，用户用户才能选择观看插页式激励广告。本指南介绍了如何集成来自 Ad Manager 的插页式激励广告转换为 Flutter 应用。

前提条件

Flutter 插件 1.1.0 或更高版本。
完成入门指南。您的 Flutter 应用应已包含 Google 移动广告 Flutter 插件。

始终使用测试广告进行测试

在构建和测试应用时，请务必使用测试广告，实际投放的广告。否则，可能会导致您的账号被暂停。

要加载测试广告，最简便的方法就是使用我们的专用测试广告单元 ID 插页式激励广告：

/21775744923/example/rewarded_interstitial

测试广告单元已配置为针对每个请求返回测试广告您可以在自己应用的编码、测试和调试过程中随意使用它们。只需确保在发布前用您自己的广告单元 ID 替换这些测试广告单元。

加载广告

以下示例加载了一个插页式激励广告：

class RewardedInterstitialExampleState extends State<RewardedInterstitialExample> {
  RewardedInterstitialAd? _rewardeInterstitialdAd;

  // TODO: replace this test ad unit with your own ad unit.
  final adUnitId = '/21775744923/example/rewarded_interstitial';

  /// Loads a rewarded ad.
  void loadAd() {
    RewardedInterstitialAd.loadWithAdManagerAdRequest(
        adUnitId: adUnitId,
        adManagerAdRequest: const AdManagerAdRequest(),
        adLoadCallback: RewardedInterstitialAdLoadCallback(
          // Called when an ad is successfully received.
          onAdLoaded: (ad) {
            debugPrint('$ad loaded.');
            // Keep a reference to the ad so you can show it later.
            _rewardedInterstitialAd = ad;
          },
          // Called when an ad request failed.
          onAdFailedToLoad: (LoadAdError error) {
            debugPrint('RewardedInterstitialAd failed to load: $error');
          },
        ));
  }
}

插页式激励广告事件

通过使用 FullScreenContentCallback，您可以监听生命周期事件（例如，广告展示或关闭广告）。设置 RewardedInterstitialAd.fullScreenContentCallback，然后向以下用户展示广告：接收这些事件的通知。本示例实现了每个方法将消息记录到控制台：

class RewardedInterstitialExampleState extends State<RewardedInterstitialExample> {
  RewardedInterstitialAd? _rewardedInterstitialAd;

  // TODO: replace this test ad unit with your own ad unit.
  final adUnitId = '/21775744923/example/rewarded_interstitial';

  /// Loads a rewarded ad.
  void loadAd() {
    RewardedInterstitialAd.loadWithAdManagerAdRequest(
        adUnitId: adUnitId,
        adManagerAdRequest: const AdManagerAdRequest(),
        adLoadCallback: RewardedInterstitialAdLoadCallback(
          // Called when an ad is successfully received.
          onAdLoaded: (ad) {
            ad.fullScreenContentCallback = FullScreenContentCallback(
              // Called when the ad showed the full screen content.
              onAdShowedFullScreenContent: (ad) {},
              // Called when an impression occurs on the ad.
              onAdImpression: (ad) {},
              // Called when the ad failed to show full screen content.
              onAdFailedToShowFullScreenContent: (ad, err) {
                // Dispose the ad here to free resources.
                ad.dispose();
              },
              // Called when the ad dismissed full screen content.
              onAdDismissedFullScreenContent: (ad) {
                // Dispose the ad here to free resources.
                ad.dispose();
              },
              // Called when a click is recorded for an ad.
              onAdClicked: (ad) {});

            debugPrint('$ad loaded.');
            // Keep a reference to the ad so you can show it later.
            _rewardedInterstitialAd = ad;
          },
          // Called when an ad request failed.
          onAdFailedToLoad: (LoadAdError error) {
            debugprint('RewardedInterstitialAd failed to load: $error');
          },
        ));
  }
}

展示广告

RewardedInterstitialAd 以叠加层的形式显示在所有应用内容之上并且是静态放置的因此无法将其添加到 Flutter widget 树。您可以通过调用 show() 来选择展示广告的时间。 RewardedInterstitialAd.show() 接受一个 OnUserEarnedRewardCallback，在用户获得奖励时调用。请务必实施此功能，奖励观看广告的用户

_rewardedInterstitialAd.show(onUserEarnedReward: (AdWithoutView ad, RewardItem rewardItem) {
  // Reward the user for watching an ad.
});

调用 show() 后，以这种方式展示的 Ad 便无法移除并且需要用户输入RewardedInterstitialAd 只能显示一次。随后会触发要展示的广告调用 onAdFailedToShowFullScreenContent.

如果不再需要访问某个广告，则必须予以处置。最佳实践调用 dispose() 的时间位于 FullScreenContentCallback.onAdDismissedFullScreenContent和 FullScreenContentCallback.onAdFailedToShowFullScreenContent 回调。

大功告成！现在，您的应用就可以展示插页式激励广告了。