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激励广告

所谓激励广告，指的是用户可以选择与之互动来换取应用内奖励的一种广告。本指南介绍了如何将 Ad Manager 激励广告植入到 Flutter 应用中。

务必用测试广告进行测试

在构建和测试应用时，请确保使用的是测试广告，而不是实际投放的广告。否则，可能会导致您的账号被中止。

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 激励广告：

/21775744923/example/rewarded

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。只需确保您会在发布应用前用自己的广告单元 ID 替换这些测试广告单元 ID 即可。

加载广告

以下示例加载了一个激励广告：

class RewardedExampleState extends State<RewardedExample> {
  RewardedAd? _rewardedAd;

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

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

激励广告事件

通过使用 FullScreenContentCallback，您可以监听各种广告生命周期事件，例如广告何时展示或何时关闭。设置在展示广告前RewardedAd.fullScreenContentCallback，获得这些活动的通知本示例实现了每个方法并记录了消息：

class RewardedExampleState extends State<RewardedExample> {
  RewardedAd? _rewardedAd;

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

  /// Loads a rewarded ad.
  void loadAd() {
    RewardedAd.loadWithAdManagerAdRequest(
        adUnitId: adUnitId,
        adManagerAdRequest: const AdManagerAdRequest(),
        adLoadCallback: RewardedAdLoadCallback(
          // 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.
            _rewardedAd = ad;
          },
          // Called when an ad request failed.
          onAdFailedToLoad: (LoadAdError error) {
            debugPrint('RewardedAd failed to load: $error');
          },
        ));
  }
}

展示广告

RewardedAd 作为叠加层展示在所有应用内容之上，并以静态方式放置；因此，您无法将其添加到 Flutter 微件树中。您可以通过调用 show() 来选择展示广告的时间。RewardedAd.show() 接受 OnUserEarnedRewardCallback，系统会在用户获得奖励。请务必实现此事件，在用户观看广告后给予奖励。

_rewardedAd.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RewardedAd只能显示一次。后续显示的调用将触发 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激励广告了。