android - flutter - 原生广告不会加载和显示，它的事件回调也不会显示任何内容

Question

在等待官方 Admob 的 Native Ads 时，我尝试使用第 3 方插件将其集成。

我尝试使用一个声称可以显示 Admob 原生广告 的插件 here .

但是，原生广告不会在 Android 设备上加载和显示(iOS 尚未测试)。

事件回调 也没有显示任何内容。

我已经提交了一个问题 here ，不过我觉得作者可能很忙，所以我也在这里发帖。

下面是我的代码:

对于初始化:

class HomeScreen extends StatefulWidget{
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> with AfterLayoutMixin<HomeScreen> {

  @override
    void initState() {
      // TODO: implement initState
      super.initState();      
      NativeAds.initialize();
      ...
    }

NativeAds 展示位置在以下结构中:

@override
Widget build(BuildContext context) {
  return Stack(
    children: <Widget>[
      Scaffold(
        appBar: AppBar( .. ),
        body: OfflineBuilder(
              connectivityBuilder: (BuildContext context, ConnectivityResult connectivity, Widget child) {
                  ...  
                  child: NestedScrollView(
                      headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) { ... }
                      body: RefreshIndicator(
                        backgroundColor: Pigment.fromString(UIData.primaryColor),
                        color: Colors.white,
                        onRefresh: () => homeBloc.init(),
                        child: ListView(
                          children: <Widget>[
                            Row(
                            ...
                              ListView(
                                physics: NeverScrollableScrollPhysics(),
                                shrinkWrap: true,
                                children: <Widget>[

                                ...


                                SizedBox(
                                  width: double.infinity,
                                  height: 320,
                                  child: NativeAdView(
                                    onParentViewCreated: (_) {
                                      print("sinative create.....");
                                    },
                                    androidParam: AndroidParam()
                                      ..placementId = "ca-app-pub-xxx" //my admob
                                      ..packageName = "com.apps.myapp"
                                      ..layoutName = "native_ad_layout"
                                      ..attributionText = "AD",
                                    iosParam: IOSParam()
                                      ..placementId = "ca-app-pub-3940256099942544/3986624511" // test
                                      ..bundleId = "{{YOUR_IOS_APP_BUNDLE_ID}}"
                                      ..layoutName = "{{YOUR_CREATED_LAYOUT_FILE_NAME}}"
                                      ..attributionText = "SPONSORED",
                                    onAdImpression: () => print("native is show"),
                                    onAdClicked: () => print("onAdClicked!!!"),
                                    onAdFailedToLoad: (Map<String, dynamic> error) => print("native is error ==> $error"),
                                  ),
                                ),                      

                                ...

                                ...

有什么想法吗？

提前致谢...

==更新(根据 Itiel Maimon 的建议)

我在 runApp() 之前在 main.dart 中进行了初始化，但在调试中出现了以下错误:

E/flutter (10737): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: MissingPluginException(No implementation found for method initialize on channel native_ads)
E/flutter (10737): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:7)
E/flutter (10737): <asynchronous suspension>
E/flutter (10737): #1      new NativeAds.initialize (package:native_ads/native_ads.dart:5:14)
E/flutter (10737): #2      main.<anonymous closure> (package:apps789apps/main.dart:35:15)
E/flutter (10737): #3      _rootRunUnary (dart:async/zone.dart:1132:38)
E/flutter (10737): #4      _CustomZone.runUnary (dart:async/zone.dart:1029:19)
E/flutter (10737): #5      _FutureListener.handleValue (dart:async/future_impl.dart:137:18)
E/flutter (10737): #6      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:678:45)
E/flutter (10737): #7      Future._propagateToListeners (dart:async/future_impl.dart:707:32)
E/flutter (10737): #8      Future._completeWithValue (dart:async/future_impl.dart:522:5)
E/flutter (10737): #9      _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:30:15)
E/flutter (10737): #10     _completeOnAsyncReturn (dart:async-patch/async_patch.dart:288:13)
E/flutter (10737): #11     SystemChrome.setPreferredOrientations (package:flutter/src/services/system_chrome.dart)
E/flutter (10737): <asynchronous suspension>
E/flutter (10737): #12     main (package:apps789apps/main.dart:31:16)
E/flutter (10737): <asynchronous suspension>
E/flutter (10737): #13     _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:229:25)
E/flutter (10737): #14     _rootRun (dart:async/zone.dart:1124:13)
E/flutter (10737): #15     _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter (10737): #16     _runZoned (dart:async/zone.dart:1516:10)
E/flutter (10737): #17     runZoned (dart:async/zone.dart:1500:12)
E/flutter (10737): #18     _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:221:5)
E/flutter (10737): #19     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:305:19)
E/flutter (10737): #20     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)

有什么解决办法吗？

Answer 1

不要将 NativeAds.initialize(); 放在 initState() 方法上。把它放在调用 runApp() 之前。例如 void main() {
NativeAds.initialize();
运行应用程序(我的应用程序())；
}

还要确保您使用的是 Admob test ad unit ids ，否则您将看不到任何广告。

如果仍然无法正常工作，请尝试使用 NativeAdViewWrapper通过在请求的位置使用 child: const NativeAdViewWrapper(),。