Flutter firebase_admob 只显示一次

Question

以下代码在应用程序底部显示横幅广告，并在点击时显示插页式广告。按下按钮时会显示插页式广告。问题是，当应用程序第一次启动并单击按钮时，会显示插页式广告，但从第二次开始不显示插页式广告。没有错误，所有日志消息都显示成功。是我的代码错误吗？我正在Android设备上进行测试。

import 'package:firebase_admob/firebase_admob.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {

  final admobAppId = 'ca-app-pub-3940256099942544~3347511713';
  final bannerId = 'ca-app-pub-3940256099942544/6300978111';
  final interstitialId = 'ca-app-pub-3940256099942544/1033173712';

  BannerAd bannerAd;
  InterstitialAd interstitialAd;

  MyApp() {
    FirebaseAdMob.instance.initialize(appId: admobAppId);
    makeBannerAd();
    initInterstitialAd();
  }

  makeBannerAd() {
    bannerAd = BannerAd(
        adUnitId: bannerId,
        size: AdSize.smartBanner,
        listener: (MobileAdEvent me) {
          print('MobileAdEvent $me');
        });
    bannerAd
      ..load()
      ..show();
  }

  initInterstitialAd() {
    interstitialAd = InterstitialAd(
        adUnitId: interstitialId,
        listener: (MobileAdEvent me) {
          print(
              '========== Interstitial ad mobile ad event =========== \n $me');
          if (me == MobileAdEvent.closed) {
            print('Interstitial closed');
            loadInterstitialAd();
          }
        });
    loadInterstitialAd();
  }

  loadInterstitialAd() {
    interstitialAd.load().then((val) {
      if (val) {
        print('Interstitial ad loaded callback success');
      } else {
        print('Interstitial ad loaded callback failed');
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('AdMob plugin test'),
        ),
        body: Center(
          child: RaisedButton(
            child: Text('Show Interstitial!'),
            onPressed: () {
              interstitialAd.show().then((val) {
                if (val) {
                  print('Interstitial ad show callback success');
                } else {
                  print('Interstitial ad show callback fail');
                }
              });
            },
          ),
        ),
      ),
    );
  }
}

更新
以下是带有 dispose() 的代码。它最多显示 2 次。

class MyApp extends StatelessWidget {

  final admobAppId = 'ca-app-pub-3940256099942544~3347511713';
  final bannerId = 'ca-app-pub-3940256099942544/6300978111';
  final interstitialId = 'ca-app-pub-3940256099942544/1033173712';

  BannerAd bannerAd;
  InterstitialAd interstitialAd;
  MobileAdTargetingInfo mobileAdTargetingInfo;

  MyApp() {
    FirebaseAdMob.instance.initialize(appId: admobAppId);
    makeBannerAd();
    initInterstitialAd();
  }

  makeBannerAd() {
    bannerAd = BannerAd(
        adUnitId: bannerId,
        size: AdSize.smartBanner,
        listener: (MobileAdEvent me) {
          print('Banner => MobileAdEvent $me');
        });
    bannerAd
      ..load()
      ..show();
  }

  initInterstitialAd() {
    interstitialAd = InterstitialAd(
        adUnitId: interstitialId,
        listener: (MobileAdEvent me) {
          print(
              '========== Interstitial ad mobile ad event =========== $me');
          if (me == MobileAdEvent.closed) {
            print('Interstitial closed');
            interstitialAd.dispose().then((val){
              if(val){
                loadInterstitialAd();
              }else{
              }
            });
          } else if (me == MobileAdEvent.failedToLoad) {
            print('Interstitial failed to load');
            loadInterstitialAd();
          }
        });
    loadInterstitialAd();
  }

  loadInterstitialAd() {
    interstitialAd.load();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('AdMob plugin test'),
        ),
        body: Center(
          child: RaisedButton(
            child: Text('Show Interstitial!'),
            onPressed: () {
              interstitialAd.show();
            },
          ),
        ),
      ),
    );
  }
}

Answer 1

我遇到了同样的问题并使用InterstitialAd对象解决了它，如下所示：

InterstitialAd myInterstitial() {
    return InterstitialAd(
      adUnitId: InterstitialAd.testAdUnitId,
      targetingInfo: targetingInfo,
      listener: (MobileAdEvent event) {
        if (event == MobileAdEvent.failedToLoad) {
          interstitialAd..load();
        } else if (event == MobileAdEvent.closed) {
          interstitialAd = myInterstitial()..load();
        }
      },
    );
  }
@override
void initState() {
    FirebaseAdMob.instance.initialize(appId: 
        FirebaseAdMob.testAppId);
    interstitialAd = myInterstitial()..load();
    super.initState();
}
@override
void dispose() {
    interstitialAd?.dispose();
    super.dispose();
}

调用方法：

interstitialAd
  ..load()
  ..show();

根据我的理解，可以使用监听器在事件关闭时递归调用初始的InterstitialAd对象。我的来源来自Tensor Programming Youtube Channel他解释得比我好得多。

Answer 2

我遇到了同样的问题。解决方案很简单。

只需用于interstitialAd.dispose()处理广告，以便下次加载新的插页式广告。