激励视频广告在重新加载时出错："ad_not_loaded, show failed for rewarded video, no ad was loaded, null)"

Question

我尝试重新加载激励视频广告，当我打电话给RewardedVideoAd.instance.load(adUnitId: "xxx", targetingInfo: xyz);时，我发现以下错误：

W/MessageQueue(13672)： Handler (android.os.Handler) {1a13e8a} 向死线程上的处理程序发送消息 W/MessageQueue(13672)： java.lang.IllegalStateException： Handler (android.os.Handler) {1a13e8a} 将消息发送到死线程上的处理程序 W/MessageQueue(13672)： at android.os.MessageQueue.enqueueMessage(MessageQueue.java：543) W/MessageQueue(13672)： at android.os.Handler.enqueueMessage(Handler.java：643) W/MessageQueue(13672)： at android.os.Handler.sendMessageAtTime(Handler.java：612) W/MessageQueue(13672)： at android.os.Handler.sendMessageDelayed(Handler.java：582) W/MessageQueue(13672)： at android.os.Handler.sendEmptyMessageDelayed(Handler.java：546) W/MessageQueue(13672)： at android.os.Handler.sendEmptyMessage(Handler.java：531) W/MessageQueue(13672)： at com.google.android.gms.ads.exoplayer1.h.c(：com.google.android.gms.policy_ads_fdr_dynamite@20300003@20300003.251657827.251657827：2) W/MessageQueue(13672)： at com.google.android.gms.ads.internal.video.exoplayer1.f.b(：com.google.android.gms.policy_ads_fdr_dynamite@20300003@20300003.251657827.251657827：1) W/MessageQueue(13672)： at com.google.android.gms.ads.internal.webview.t.E(：com.google.android.gms.policy_ads_fdr_dynamite@20300003@20300003.251657827.251657827：5) W/MessageQueue(13672)： at com.google.android.gms.ads.internal.webview.j.onPageDone(：com.google.android.gms.policy_ads_fdr_dynamite@20300003@20300003.251657827.251657827：2) W/MessageQueue(13672)： at uU.d(PG：307) W/MessageQueue(13672)： at aIV.handleMessage(PG：73) W/MessageQueue(13672)： at android.os.Handler.dispatchMessage(Handler.java：102) W/MessageQueue(13672)： at android.os.Looper.loop(Looper.java：154) W/MessageQueue(13672)： at android.app.ActivityThread.main(ActivityThread.java：6780) W/MessageQueue(13672)： at java.lang.reflect.Method.invoke(Native Method) W/MessageQueue(13672)： at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java：1496) W/MessageQueue(13672)： at com.android.internal.os.ZygoteInit.main(ZygoteInit.java：1386) W/ExoPlayerImplInternal(13672)：发布后发送消息(1)。消息已忽略。 D/Graph (13672)： removeVertex() ： insertDummyVertex，因为没有祖先。 D/ViewRootImpl@b8db50eAdActivity： mHardwareRenderer.destroy()#4 D/ViewRootImpl@b8db50eAdActivity： dispatchDetachedFromWindow

我把听众放在屏幕的initState()。 在这个屏幕中，我有一个button，如果我们点击它，它应该显示Rewarded Video Ads.

此外，在重新加载Rewarded Ads时出现错误后，点击按钮显示广告后出现以下错误(因为广告实例为空)：

E/颤振 (13672)： [错误：颤振/lib/ui/ui_dart_state.cc(148)] 未处理的异常：平台异常(ad_not_loaded，激励视频显示失败，未加载广告，空)E/颤振 (13672)：#0 StandardMethodCodec.decodeEnvelope (package：flutter/src/services/message_codecs.dart：564：7) E/flutter (13672)： #1 MethodChannel.invokeMethod (package：flutter/src/services/platform_channel.dart：316：33) E/颤振 (13672)： E/颤振 (13672)： #2 _invokeBooleanMethod (包：firebase_admob/firebase_admob.dart：518：61) E/颤振 (13672)： E/颤振 (13672)： #3 奖励视频广告 (包：firebase_admob/firebase_admob.dart：392：12)

我把Rewarded Video Ads Listener放在initState()，以下是代码：

@override
void initState() {
super.initState();
...
RewardedVideoAd.instance.listener =
(RewardedVideoAdEvent event, {String rewardType, int rewardAmount}) {
if (event == RewardedVideoAdEvent.completed) {
setState(() {
print ("::debug:: ads should be reloaded");
RewardedVideoAd.instance.load(adUnitId: "ca-app-pub-3940256099942544/5224354917", targetingInfo: targetingInfos);
});
}
};
...

但是，如果我像下面这样将代码放在按钮的onPressed，视频广告将在点击 2-3 次后显示(调试时显示ads = null)

RaisedButton(
onPressed: () {
RewardedVideoAd.instance.show().whenComplete(() {
RewardedVideoAd.instance.load(adUnitId: "ca-app-pub-3940256099942544/5224354917", targetingInfo: targetingInfos);
})    
},
...

任何想法 ？

提前致谢...

Answer 1

似乎问题出在事件completed上。查看此代码。

MobileAdTargetingInfo targetingInfo = MobileAdTargetingInfo(
keywords: <String>['flutterio', 'beautiful apps'],
contentUrl: 'https://flutter.io',
childDirected: false,
testDevices: <String>[], // Android emulators are considered test devices
);
bool _loaded = false;
@override
void initState() {
super.initState();
// load ad in the beginning
RewardedVideoAd.instance
.load(adUnitId: RewardedVideoAd.testAdUnitId, targetingInfo: targetingInfo)
.catchError((e) => print("error in loading 1st time"))
.then((v) => setState(() => _loaded = v));
// ad listener
RewardedVideoAd.instance.listener = (RewardedVideoAdEvent event, {String rewardType, int rewardAmount}) {
if (event == RewardedVideoAdEvent.closed) {
RewardedVideoAd.instance
.load(adUnitId: RewardedVideoAd.testAdUnitId, targetingInfo: targetingInfo)
.catchError((e) => print("error in loading again"))
.then((v) => setState(() => _loaded = v));
}
};
}

@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Text(
"Loaded = ${_loaded}",
style: TextStyle(fontSize: 32, fontWeight: FontWeight.bold),
),
),
floatingActionButton: FloatingActionButton(
// show ad on FAB click
onPressed: () async {
await RewardedVideoAd.instance.show().catchError((e) => print("error in showing ad: ${e.toString()}"));
setState(() => _loaded = false);
},
),
);
}

Answer 2

无需调用 set 状态，因为它很昂贵并且会导致完全重建。

可以通过以下方式轻松解决此问题：

import 'package:flutter/material.dart';
import 'package:firebase_admob/firebase_admob.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: HomePage());
}
}
class HomePage extends StatefulWidget {
HomePage({Key key}) : super(key: key);
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
//The targeting info required for Rewarded Videos Ads
MobileAdTargetingInfo targetingInfo = MobileAdTargetingInfo(
keywords: <String>['flutterio', 'beautiful apps'],
contentUrl: 'https://flutter.io',
childDirected: false,
testDevices: <String>[], // Android emulators are considered test devices
);
//An instance to be called in the init state
RewardedVideoAd _videoAd = RewardedVideoAd.instance;
@override
void initState() {
//---------------------------------------//
//Initialise the listener with the values.
_videoAd.listener =
(RewardedVideoAdEvent event, {String rewardType, int rewardAmount}) {
if (event == RewardedVideoAdEvent.completed) {
//When the video ad gets completed load a new video ad
_videoAd
.load(
adUnitId: RewardedVideoAd.testAdUnitId,
targetingInfo: targetingInfo)
.catchError((e) => print('Error in loading.'));
}
//On every other event change pass the values to the _handleEvent Method.
_handleEvent(event, rewardType, 'Reward', rewardAmount);
};
//------------------------------------------------------------------//
//This will load the video when the widget is built for the first time.
_videoAd
.load(
adUnitId: RewardedVideoAd.testAdUnitId,
targetingInfo: targetingInfo)
.catchError((e) => print('Error in loading.'));
//-----------------------------------------------------//
super.initState();
}
//---- Useful function to know exactly what is being done ----//
void _handleEvent(RewardedVideoAdEvent event, String rewardType,
String adType, int rewardAmount) {
switch (event) {
case RewardedVideoAdEvent.loaded:
_showSnackBar('New Admob $adType Ad loaded!', 1500);
break;
case RewardedVideoAdEvent.opened:
_showSnackBar('Admob $adType Ad opened!', 1500);
break;
//
//The way we are fixing the issue is here.
//This is by calling the video to be loaded when the other rewarded video is closed.
case RewardedVideoAdEvent.closed:
_showSnackBar('Admob $adType Ad closed!', 1500);
_videoAd
.load(
adUnitId: RewardedVideoAd.testAdUnitId,
targetingInfo: targetingInfo)
.catchError((e) => print('Error in loading.'));
break;
case RewardedVideoAdEvent.failedToLoad:
_showSnackBar('Admob $adType failed to load.', 1500);
break;
case RewardedVideoAdEvent.rewarded:
_showSnackBar('Rewarded $rewardAmount', 3000);
break;
default:
}
}
//Snackbar shown with ad status
void _showSnackBar(String content, int duration) {
Scaffold.of(context).showSnackBar(SnackBar(
content: Text(content),
duration: Duration(milliseconds: duration),
));
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: FlatButton(
child: Text('Play AD'),
onPressed: () {
_videoAd.show().catchError(
(e) => print("error in showing ad: ${e.toString()}"));
},
),
),
);
}
}

Answer 3

您可以简单地捕获异常，如下所示：

myRewardVideoAd.show()
.catchError((e) => print("error in showing ad: ${e.toString()}"));

Answer 4

嗨，我认为最好的解决方案是使用 try catch，如果有问题，我们可以尝试再次显示它。这是我的代码;

MobileAdTargetingInfo targetingInfo = MobileAdTargetingInfo(
keywords: <String>['flutterio', 'beautiful apps'],
contentUrl: 'https://flutter.io',
childDirected: false,
testDevices: <String>[],
);
String adUnit = "ca-app-pub-6288831324909345/9733176442";
bool tryAgain = false;
await RewardedVideoAd.instance
.load(adUnitId: adUnit, targetingInfo: targetingInfo);
try {
await RewardedVideoAd.instance.show();
} on PlatformException catch (e) {
tryAgain = true;
print(e.message);
}
RewardedVideoAd.instance.listener =
(RewardedVideoAdEvent event, {String rewardType, int rewardAmount}) {
switch (event) {
case RewardedVideoAdEvent.rewarded:
setState(() {
// Here, apps should update state to reflect the reward.
print("_goldCoins += rewardAmount");
});
break;
case RewardedVideoAdEvent.loaded:
if (tryAgain) RewardedVideoAd.instance.show();
break;
default:
print(event.toString());
break;
}
};

Answer 5

请检查您是否在 adMob 帐号中添加了付款信息。在未向 Google 提供这些信息的情况下，系统禁止查看广告。 广告支付

另一个问题可能是您的帐户尚未获得批准。这意味着您的帐户是新的，您必须等待 24 小时到 2 周。