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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 AdMob 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,可能会导致您的帐号被暂停。

对于激励广告,加载测试广告最简便的方法就是使用下面的专用测试广告单元 ID:

Android

ca-app-pub-3940256099942544/5224354917

iOS

ca-app-pub-3940256099942544/1712485313

测试广告单元配置为为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这些广告单元。只是一定要在发布应用前用您自己的广告单元 ID 替换这些测试广告单元 ID。

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,您可以监听各种广告生命周期事件,例如广告展示或关闭的时间。在展示广告之前设置 RewardedAd.fullScreenContentCallback,以便接收这些事件的通知。以下示例实现了每个方法,并将消息记录到控制台:

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 作为叠加层显示在所有应用内容之上,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。RewardedAd.show() 接受 OnUserEarnedRewardCallback,后者会在用户获得奖励时调用。请务必实现此功能,并奖励观看广告的用户。

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

调用 show() 后,以这种方式显示的 Ad 无法以编程方式移除,并且需要用户输入。一个 RewardedAd 只能显示一次。对显示内容的后续调用将触发 onAdFailedToShowFullScreenContent

当不再需要访问广告时,必须处置该广告。调用 dispose() 的最佳做法是在 FullScreenContentCallback.onAdDismissedFullScreenContentFullScreenContentCallback.onAdFailedToShowFullScreenContent 回调中调用。

大功告成!您的应用现在就可以展示激励广告了。

GitHub 上的完整示例

激励广告