激励广告

所谓激励广告，指的是用户可以选择与之互动的一种广告， 了解应用内奖励。本指南介绍了 如何将 AdMob 激励广告植入到 Flutter 应用中。

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 激励广告：

Android

ca-app-pub-3940256099942544/5224354917

iOS

ca-app-pub-3940256099942544/1712485313

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 应用。

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 = Platform.isAndroid
    ? 'ca-app-pub-3940256099942544/5224354917'
    : 'ca-app-pub-3940256099942544/1712485313';

  /// Loads a rewarded ad.
  void loadAd() {
    RewardedAd.load(
        adUnitId: adUnitId,
        request: const AdRequest(),
        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，您可以监听生命周期 事件（例如，广告展示或关闭广告）。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 = Platform.isAndroid
    ? 'ca-app-pub-3940256099942544/5224354917'
    : 'ca-app-pub-3940256099942544/1712485313';

  /// Loads a rewarded ad.
  void loadAd() {
    RewardedAd.load(
        adUnitId: adUnitId,
        request: const AdRequest(),
        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() 选择展示广告的时间。 RewardedAd.show() 接受 OnUserEarnedRewardCallback，系统会在 用户获得奖励。请务必实现此机制并奖励用户 观看广告。

_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。

GitHub 上的完整示例

激励广告