插頁式獎勵廣告是一種獎勵廣告格式，可讓您在應用程式自然轉換時自動顯示廣告，並提供獎勵。與獎勵廣告不同的是，插頁式獎勵廣告不需要等使用者確定選擇觀看即可放送。本指南將說明如何將 AdMob 的獎勵插頁式廣告整合至 Flutter 應用程式。
必要條件
請務必使用測試廣告進行測試
建構及測試應用程式時，請務必使用測試廣告，而非實際的正式版廣告。否則可能導致帳戶停權。
如要載入測試廣告，最簡單的方法是使用獎勵插頁式廣告專用的測試廣告單元 ID：
Android
ca-app-pub-3940256099942544/5354046379
iOS
ca-app-pub-3940256099942544/6978759866
測試廣告單元會在每個請求中傳回測試廣告，您可以在編寫程式碼、測試和偵錯時，在自己的應用程式中自由使用這些廣告單元。請務必在發布應用程式前，將這些 ID 替換成您自己的廣告單元 ID。
載入廣告
以下範例會載入插頁式獎勵廣告：
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: $error');
},
));
}
}
插頁式獎勵廣告事件
您可以使用 FullScreenContentCallback 監聽生命週期事件，例如廣告顯示或關閉的時間。請先設定 RewardedInterstitialAd.fullScreenContentCallback，再放送廣告，以便接收這些事件的通知。這個範例會實作每個方法，並將訊息記錄到控制台：
class RewardedInterstitialExampleState extends State<RewardedInterstitialExample> {
RewardedInterstitialAd? _rewardedInterstitialAd;
// TODO: replace this test ad unit with your own ad unit.
final adUnitId = Platform.isAndroid
? 'ca-app-pub-3940256099942544/5354046379'
: 'ca-app-pub-3940256099942544/6978759866';
/// Loads a rewarded ad.
void loadAd() {
RewardedInterstitialAd.load(
adUnitId: adUnitId,
adRequest: const AdRequest(),
adLoadCallback: RewardedInterstitialAdLoadCallback(
// Called when an ad is successfully received.
onAdLoaded: (ad) {
ad.fullScreenContentCallback = FullScreenContentCallback(
// Called when the ad showed the full screen content.
onAdShowedFullScreenContent: (ad) {},
// Called when an impression occurs on the ad.
onAdImpression: (ad) {},
// Called when the ad failed to show full screen content.
onAdFailedToShowFullScreenContent: (ad, err) {
// Dispose the ad here to free resources.
ad.dispose();
},
// Called when the ad dismissed full screen content.
onAdDismissedFullScreenContent: (ad) {
// Dispose the ad here to free resources.
ad.dispose();
},
// Called when a click is recorded for an ad.
onAdClicked: (ad) {});
debugPrint('$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');
},
));
}
}
多媒體廣告
RewardedInterstitialAd 會以重疊方式顯示在所有應用程式內容上方，並以靜態方式放置，因此無法新增至 Flutter 小工具樹狀結構。您可以呼叫 show()，選擇廣告的顯示時機。RewardedInterstitialAd.show() 會採用 OnUserEarnedRewardCallback，並在使用者獲得獎勵時叫用。請務必實作這項功能，並在使用者觀看廣告時提供獎勵。
_rewardedInterstitialAd.show(onUserEarnedReward: (AdWithoutView ad, RewardItem rewardItem) {
// Reward the user for watching an ad.
});
呼叫 show() 後，以這種方式顯示的 Ad 無法以程式輔助方式移除，必須由使用者輸入。RewardedInterstitialAd 只能顯示一次。後續的顯示呼叫會觸發 onAdFailedToShowFullScreenContent。
廣告必須在不再需要存取權時處置。呼叫 dispose() 的最佳做法是在 FullScreenContentCallback.onAdDismissedFullScreenContent 和 FullScreenContentCallback.onAdFailedToShowFullScreenContent 回呼中。
大功告成！您的應用程式現在已可顯示插頁式獎勵廣告。