无法在 flutter 中的 listView.builder 中显示原生广告？

问题描述

 Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  final initFuture = MobileAds.instance.initialize();
  final adState = Adv(initFuture);

  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
  await FlutterlocalnotificationsPlugin
      .resolvePlatformSpecificImplementation<
          AndroidFlutterlocalnotificationsPlugin>()
      ?.createNotificationChannel(channel);
  initScreen = await Authenticate().readStorage('initScreen');
  print(initScreen);
  await Authenticate().writeStorage('initScreen',"true");

  runApp(MyApp(
    appRouter: AppRouter(),connectivity: Connectivity(),drawerBloc: DrawerBloc(DrawerState(NavItem.homepage)),));
}

这是我的main.dart代码

    import 'dart:io';

import 'package:google_mobile_ads/google_mobile_ads.dart';

class Adv {
  Future<InitializationStatus> initialization;

  Adv(this.initialization);

  static String get categoriesNativeAdUnitId {
    if (Platform.isAndroid) {
      return 'ca-app-pub-3940256099942544/6300978111';
    } else if (Platform.isIOS) {
      return 'ca-app-pub-3940256099942544/2934735716';
    }
    throw new UnsupportedError("Unsupported platform");
  }

  static String get homeNativeAdUnitId {
    if (Platform.isAndroid) {
      return 'ca-app-pub-3940256099942544/2247696110';
    } else if (Platform.isIOS) {
      return 'ca-app-pub-3940256099942544/3986624511';
    }
    throw new UnsupportedError("Unsupported platform");
  }

  static String get newsPageNativeAdUnitId {
    if (Platform.isAndroid) {
      return 'ca-app-pub-3940256099942544/2247696110';
    } else if (Platform.isIOS) {
      return 'ca-app-pub-3940256099942544/3986624511';
    }
    throw new UnsupportedError("Unsupported platform");
  }

  static String get blogsBannerAdUnitId {
    if (Platform.isAndroid) {
      return 'ca-app-pub-3940256099942544/2247696110';
    } else if (Platform.isIOS) {
      return 'ca-app-pub-3940256099942544/3986624511';
    }
    throw new UnsupportedError("Unsupported platform");
  }

  static String get publisherListPageNativeAdUnitId {
    if (Platform.isAndroid) {
      return 'ca-app-pub-3940256099942544/2247696110';
    } else if (Platform.isIOS) {
      return 'ca-app-pub-3940256099942544/3986624511';
    }
    throw new UnsupportedError("Unsupported platform");
  }

  
}

这是我的adhelper.dart的代码

     class ShowHomeNews extends StatefulWidget {
  final List<NewsModel> newsModel;
  final int index;
  const ShowHomeNews({
    Key key,@required this.newsModel,this.index,}) : super(key: key);

  @override
  _ShowHomeNewsstate createState() => _ShowHomeNewsstate();
}

class _ShowHomeNewsstate extends State<ShowHomeNews> {
  int adCountTrack = 0;

  bool _isAdLoaded = false;
  List<NativeAd> adList = [];
  @override
  void initState() {
    super.initState();
    adLoader();
  }

  adLoader() {
    setState(() {
      int len = ((widget.newsModel.length) / 4).floor();
      for (int i = 0; i < len; i++) {
        print(i.toString());
        print("i ki vaues:" + i.toString());
        adList.add(
          NativeAd(
              adUnitId: Adv.homeNativeAdUnitId,factoryId: 'listTile',listener: AdListener(
                onAdLoaded: (_) {
                  setState(() {
                    _isAdLoaded = true;
                  });
                },onAdFailedToLoad: (ad,error) {
                  // Releases an ad resource when it fails to load

                  print(
                      'Ad load Failed (code=${error.code} message=${error.message})');
                },),request: AdRequest())
            ..load(),);
      }
    });

    print("AdList size: " + adList.length.toString());
  }

  @override
  Widget build(BuildContext context) {
    return Refreshindicator(
      onRefresh: () async => BlocProvider.of<TabbarblocBloc>(context).add(
        PageTapped(index: widget.index),child: SingleChildScrollView(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,children: [
            Padding(
              padding: const EdgeInsets.fromLTRB(10,5,10,0),child: Text(
                "Trending",style: TextStyle(fontWeight: FontWeight.w600),Padding(
              padding: const EdgeInsets.all(8.0),child: Container(
                height: 200,child: ListView.builder(
                  physics: ClampingScrollPhysics(),primary: false,itemCount: widget.newsModel.length,shrinkWrap: true,scrollDirection: Axis.horizontal,itemBuilder: (context,index) {
                    return TrendingTile(
                      newsModel: widget.newsModel[index],);
                  },Container(
              child: ListView.builder(
                  primary: false,index) {
                    print(widget.newsModel.length);
                    if (index % 4 == 0 && adCountTrack < adList.length) {
                      return Padding(
                        padding: const EdgeInsets.all(8.0),child: Container(
                          height: 120.0,width: 120.0,decoration: Boxdecoration(
                            color: whiteTextColor,borderRadius: BorderRadius.circular(12),BoxShadow: [
                              BoxShadow(
                                  spreadRadius: 1,blurRadius: 5.0,// soften the shadow
                                  offset: Offset(
                                    1.0,// Move to right 10  horizontally
                                    2.0,// Move to bottom 10 Vertically
                                  ),color: Colors.grey[350])
                            ],child: AdWidget(
                            ad: adList[adCountTrack++],);
                    } else if (widget.newsModel[index].views <=
                        comparetotalViewForGrid) {
                      return Padding(
                        padding: const EdgeInsets.all(8.0),child: NewsTileSmall(
                          newsModel: widget.newsModel[index],);
                    } else {
                      return Padding(
                        padding: const EdgeInsets.all(8.0),child: NewsTileBig(
                          newsModel: widget.newsModel[index],);
                    }
                  }),],);
  }
}

这是我的文件的代码，我试图在其中显示列表中的原生广告，但没有显示原生广告。显示。

下面我添加了调试控制台日志

D/DynamitePackage(19276)：实例化 com.google.android.gms.ads.ChimeraAdLoaderBuilderCreatorImpl I/Ads
(19276)：使用 RequestConfiguration.Builder().setTestdeviceids(Arrays.asList("FA6C491A794C3455DA1F640FE2E82C3A")) 在此设备上获取测试广告。 I/DynamiteModule(19276)：考虑 本地模块 com.google.android.gms.ads.dynamite:0 和远程模块 com.google.android.gms.ads.dynamite:210890500 I/DynamiteModule(19276): 选择远程版本的 com.google.android.gms.ads.dynamite， 版本 >= 210890500 带包裹 (19276)：**** 强制接口() 预期 'com.google.android.gms.ads.clearcut.IClearcut' 但阅读 'com.google.android.gms.gass.internal.clearcut.IClearcut' I/DynamiteModule(19276)：考虑本地模块 com.google.android.gms.ads.dynamite:0 和远程模块 com.google.android.gms.ads.dynamite:210890500 I/DynamiteModule(19276): 选择远程版本的 com.google.android.gms.ads.dynamite， 版本 >= 210890500 I/DynamiteModule(19276)：考虑本地模块 com.google.android.gms.ads.dynamite:0 和远程模块 com.google.android.gms.ads.dynamite:210890500 I/DynamiteModule(19276): 选择远程版本的 com.google.android.gms.ads.dynamite， 版本 >= 210890500 带包裹 (19276)：**** 强制接口() 预期 'com.google.android.gms.ads.clearcut.IClearcut' 但阅读 'com.google.android.gms.gass.internal.clearcut.IClearcut' I/AudioManager(19276)：在 isspeakerphoneOn() 中，调用应用程序： com.indiary.indiary D/DynamitePackage(19276)：实例化 com.google.android.gms.ads.ChimeraAdLoaderBuilderCreatorImpl I/Ads
(19276)：使用 RequestConfiguration.Builder().setTestdeviceids(Arrays.asList("FA6C491A794C3455DA1F640FE2E82C3A")) 在此设备上获取测试广告。 I/AudioManager(19276)：在 isspeakerphoneOn()，调用应用程序：com.indiary.indiary I/Flutter (19276): 26 D/DynamitePackage(19276): 实例化 com.google.android.gms.ads.ChimeraAdLoaderBuilderCreatorImpl I/Ads
(19276)：使用 RequestConfiguration.Builder().setTestdeviceids(Arrays.asList("FA6C491A794C3455DA1F640FE2E82C3A")) 在此设备上获取测试广告。 I/AudioManager(19276)：在 isspeakerphoneOn()，调用应用程序：com.indiary.indiary D/DynamitePackage(19276)：实例化 com.google.android.gms.ads.ChimeraAdLoaderBuilderCreatorImpl /Ads
(19276)：使用 RequestConfiguration.Builder().setTestdeviceids(Arrays.asList("FA6C491A794C3455DA1F640FE2E82C3A")) 在此设备上获取测试广告。 I/AudioManager(19276)：在 isspeakerphoneOn()，调用应用程序：com.indiary.indiary 2 I/Flutter (19276): 26 D/DynamitePackage(19276): 实例化 com.google.android.gms.ads.ChimeraAdLoaderBuilderCreatorImpl I/Ads
(19276)：使用 RequestConfiguration.Builder().setTestdeviceids(Arrays.asList("FA6C491A794C3455DA1F640FE2E82C3A")) 在此设备上获取测试广告。我/扑（19276）：26 I/AudioManager(19276)：在 isspeakerphoneOn() 中，调用应用程序： com.indiary.indiary D/DynamitePackage(19276)：实例化 com.google.android.gms.ads.ChimeraAdLoaderBuilderCreatorImpl I/Ads
(19276)：使用 RequestConfiguration.Builder().setTestdeviceids(Arrays.asList("FA6C491A794C3455DA1F640FE2E82C3A")) 在此设备上获取测试广告。 I/AudioManager(19276)：在 isspeakerphoneOn()，调用应用程序：com.indiary.indiary W/pool-30-thread-(19276): type=1400 audit(0.0:6476): avc: grant { 执行 } 为 path="/data/data/com.indiary.indiary/app_pccache/5/CCFA22EBAF6E1880534512380E8EF01170FD9593/pcam.jar" dev="dm-14" ino=5090217 scontext=u:r:untrusted_app:s0:c250,c257,c512,c768 tcontext=u:object_r:app_data_file:s0:c250,c768 tclass=文件 app=com.indiary.indiary 7 I/Flutter (19276): 26 E/Flutter (19276): [错误：Flutter/shell/platform/android/platform_view_android_jni_impl.cc(49)] java.lang.IllegalStateException: PlatformView#getView() 返回空值， 但是需要 Android 视图参考。 E/颤振 (19276)：在 io.Flutter.plugin.platform.PlatformViewsController.initializePlatformViewIfNeeded(PlatformViewsController.java:717) E/颤振 (19276)：在 io.Flutter.plugin.platform.PlatformViewsController.ondisplayPlatformView(PlatformViewsController.java:746) E/颤振 (19276)：在 io.Flutter.embedding.engine.FlutterJNI.ondisplayPlatformView(FlutterJNI.java:1195) E/Flutter (19276)：在 android.os.MessageQueue.nativePollOnce(Native 方法）E/Flutter (19276)：在 android.os.MessageQueue.next(MessageQueue.java:335) E/Flutter (19276)： 在 android.os.Looper.loop(Looper.java:183) E/Flutter (19276): 在 android.app.ActivityThread.main(ActivityThread.java:8010) E/Flutter (19276): 在 java.lang.reflect.Method.invoke(Native Method) E/Flutter (19276)：在 com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:631) E/颤振 (19276)：在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:978) E/Flutter (19276): F/颤振 (19276): [致命：Flutter/shell/platform/android/platform_view_android_jni_impl.cc(1395)] 检查失败：CheckException(env)。 F/libc (19276)：致命信号 6 (SIGABRT),tid 19276 (indiary.indiary) 中的代码 -6 (SI_TKILL),pid 19276 (indiary.indiary)

我尝试使用 google_mobile_ads sdk 显示 google 原生广告，我想在列表之间显示 n 个广告，就像每显示 4 项原生广告一样，但我无法显示它们，我的应用程序崩溃了?

解决方法

改变

List<Object> adList;

为此：

List<NativeAd> adList = [];

由于您收到空错误，这意味着您正在尝试将 NativeAd 对象添加到您的列表中，但它仍未被初始化。