插页式广告属于全屏广告,会覆盖宿主应用的整个界面,通常展示在应用流程的自然过渡点上,例如,活动之间的切换处或游戏关卡之间的暂停时段中。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。
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,可能会导致您的账号被中止。
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
这些测试广告单元 ID 已经过专门配置,可确保每个请求返回的都是测试广告。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 ID。只需确保您会在发布应用前用自己的广告单元 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: $error'); }, )); } }
插页式广告事件
通过使用 FullScreenContentCallback
,您可以监听各种广告生命周期事件,例如广告何时展示或何时关闭。请在展示广告之前设置 InterstitialAd.fullScreenContentCallback
,以便接收这些事件的相关通知。以下示例实现了每个方法:
class InterstitialExampleState extends State<InterstitialExample> { InterstitialAd? _interstitialAd; // TODO: replace this test ad unit with your own ad unit. final adUnitId = Platform.isAndroid ? 'ca-app-pub-3940256099942544/1033173712' : 'ca-app-pub-3940256099942544/4411468910'; /// Loads an interstitial ad. void loadAd() { InterstitialAd.load( adUnitId: adUnitId, request: const AdRequest(), adLoadCallback: InterstitialAdLoadCallback( // Called when an ad is successfully received. onAdLoaded: (ad) { ad.fullScreenContentCallback = FullScreenContentCallback( // Called when the ad showed the full screen content. onAdShowedFullScreenContent: (ad) {}, // Called when an impression occurs on the ad. onAdImpression: (ad) {}, // Called when the ad failed to show full screen content. onAdFailedToShowFullScreenContent: (ad, err) { // Dispose the ad here to free resources. ad.dispose(); }, // Called when the ad dismissed full screen content. onAdDismissedFullScreenContent: (ad) { // Dispose the ad here to free resources. ad.dispose(); }, // Called when a click is recorded for an ad. onAdClicked: (ad) {}); debugPrint('$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
作为 Overlay
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()
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,并且需要用户输入内容。InterstitialAd
仅可展示一次。后续显示的调用将触发 onAdFailedToShowFullScreenContent
。
当不再需要访问广告时,必须对其进行处置。调用 dispose()
的最佳实践是在 FullScreenContentCallback.onAdDismissedFullScreenContent
和 FullScreenContentCallback.onAdFailedToShowFullScreenContent
回调中进行。
大功告成!您的应用现在就可以展示插页式广告了。