插页式激励广告是一种激励用户的广告格式，采用这种格式时，您可以通过在应用中的自然过渡点自动展示的广告向用户提供奖励。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 AdMob 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 应用应该已经导入了 Google 移动广告 Flutter 插件。
务必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 插页式激励广告：
Android
ca-app-pub-3940256099942544/5354046379
iOS
ca-app-pub-3940256099942544/6978759866
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 = Platform.isAndroid
? 'ca-app-pub-3940256099942544/5354046379'
: 'ca-app-pub-3940256099942544/6978759866';
/// Loads a rewarded ad.
void loadAd() {
RewardedInterstitialAd.load(
adUnitId: adUnitId,
adRequest: const AdRequest(),
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: $error');
},
));
}
}
插页式激励广告事件
通过使用 FullScreenContentCallback，您可以监听各种广告生命周期事件，例如广告何时展示或何时关闭。请在展示广告之前设置 RewardedInterstitialAd.fullScreenContentCallback，以便接收这些事件的相关通知。以下示例实现了每个方法，并将消息记录到控制台：
class RewardedInterstitialExampleState extends State<RewardedInterstitialExample> {
RewardedInterstitialAd? _rewardedInterstitialAd;
// TODO: replace this test ad unit with your own ad unit.
final adUnitId = Platform.isAndroid
? 'ca-app-pub-3940256099942544/5354046379'
: 'ca-app-pub-3940256099942544/6978759866';
/// Loads a rewarded ad.
void loadAd() {
RewardedInterstitialAd.load(
adUnitId: adUnitId,
adRequest: const AdRequest(),
adLoadCallback: RewardedInterstitialAdLoadCallback(
// Called when an ad is successfully received.
onAdLoaded: (ad) {
ad.fullScreenContentCallback = FullScreenContentCallback(
// Called when the ad showed the full screen content.
onAdShowedFullScreenContent: (ad) {},
// Called when an impression occurs on the ad.
onAdImpression: (ad) {},
// Called when the ad failed to show full screen content.
onAdFailedToShowFullScreenContent: (ad, err) {
// Dispose the ad here to free resources.
ad.dispose();
},
// Called when the ad dismissed full screen content.
onAdDismissedFullScreenContent: (ad) {
// Dispose the ad here to free resources.
ad.dispose();
},
// Called when a click is recorded for an ad.
onAdClicked: (ad) {});
debugPrint('$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 仅可展示一次。随后会触发要展示的广告调用
onAdFailedToShowFullScreenContent。
当不再需要广告时，必须处置该广告。调用 dispose() 的最佳实践是，在 FullScreenContentCallback.onAdDismissedFullScreenContent 和 FullScreenContentCallback.onAdFailedToShowFullScreenContent 回调中调用。
大功告成！现在，您的应用就可以展示插页式激励广告了。