插页式广告是全屏广告,会覆盖宿主应用的整个界面。它们通常在应用流程的自然过渡点展示,例如,活动之间的切换处或游戏关卡之间的暂停时段。当应用展示插页式广告时,用户可以选择点按广告,访问其目标网址,也可以将其关闭,返回应用。
本指南介绍了如何将插页式广告植入到 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,请确保使用测试广告,而不是实际投放的广告。否则,可能会导致您的帐号被暂停。
对于插页式广告,加载测试广告最简便的方法就是使用下面的测试专用广告单元 ID:
Android
ca-app-pub-3940256099942544/1033173712
iOS
ca-app-pub-3940256099942544/4411468910
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测试广告单元。只需确保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 即可。
加载广告
以下示例加载了一个插页式广告:
class InterstitialExampleState extends State<InterstitialExample> { InterstitialAd? _interstitialAd; // TODO: replace this test ad unit with your own ad unit. final adUnitId = Platform.isAndroid ? 'ca-app-pub-3940256099942544/1033173712' : 'ca-app-pub-3940256099942544/4411468910'; /// Loads an interstitial ad. void loadAd() { InterstitialAd.load( adUnitId: adUnitId, request: const AdRequest(), adLoadCallback: InterstitialAdLoadCallback( // Called when an ad is successfully received. onAdLoaded: (ad) { debugPrint('$ad loaded.'); // Keep a reference to the ad so you can show it later. _interstitialAd = ad; }, // Called when an ad request failed. onAdFailedToLoad: (LoadAdError error) { debugPrint('InterstitialAd failed to load: $error'); }, )); } }
插页式广告事件
通过使用 FullScreenContentCallback
,您可以监听各种广告生命周期事件,例如广告何时展示或何时关闭。在展示广告之前设置 InterstitialAd.fullScreenContentCallback
,以接收这些事件的通知。以下示例实现了每个方法:
class InterstitialExampleState extends State<InterstitialExample> { InterstitialAd? _interstitialAd; // TODO: replace this test ad unit with your own ad unit. final adUnitId = Platform.isAndroid ? 'ca-app-pub-3940256099942544/1033173712' : 'ca-app-pub-3940256099942544/4411468910'; /// Loads an interstitial ad. void loadAd() { InterstitialAd.load( adUnitId: adUnitId, request: const AdRequest(), adLoadCallback: InterstitialAdLoadCallback( // Called when an ad is successfully received. onAdLoaded: (ad) { ad.fullScreenContentCallback = FullScreenContentCallback( // Called when the ad showed the full screen content. onAdShowedFullScreenContent: (ad) {}, // Called when an impression occurs on the ad. onAdImpression: (ad) {}, // Called when the ad failed to show full screen content. onAdFailedToShowFullScreenContent: (ad, err) { // Dispose the ad here to free resources. ad.dispose(); }, // Called when the ad dismissed full screen content. onAdDismissedFullScreenContent: (ad) { // Dispose the ad here to free resources. ad.dispose(); }, // Called when a click is recorded for an ad. onAdClicked: (ad) {}); debugPrint('$ad loaded.'); // Keep a reference to the ad so you can show it later. _interstitialAd = ad; }, // Called when an ad request failed. onAdFailedToLoad: (LoadAdError error) { debugPrint('InterstitialAd failed to load: $error'); }, )); } }
展示插页式广告
InterstitialAd
会在所有应用内容之上显示为 Overlay
,并以静态方式放置;因此,它无法添加到 Flutter widget 树。您可以通过调用 show()
来选择展示广告的时间。
_interstitiaAd.show();
调用 show()
后,以这种方式展示的 Ad
无法以编程方式关闭,并且需要用户输入。InterstitialAd
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。调用 dispose()
的最佳实践是在 FullScreenContentCallback.onAdDismissedFullScreenContent
和 FullScreenContentCallback.onAdFailedToShowFullScreenContent
回调中进行。
大功告成!现在,您的应用就可以展示插页式广告了。