谷歌移动广告投放MissingPluginException

Question

RewardedAd在google_mobile_ads上不起作用: 2.0.1我已经到处搜索过了，修复程序也不起作用。

这是日志上的错误。

E/DartMessenger( 5002): Uncaught exception in binary message listener
E/DartMessenger( 5002): java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Map
E/DartMessenger( 5002):     at io.flutter.plugins.googlemobileads.AdMessageCodec.readValueOfType(AdMessageCodec.java:231)
E/DartMessenger( 5002):     at io.flutter.plugin.common.StandardMessageCodec.readValue(StandardMessageCodec.java:340)
E/DartMessenger( 5002):     at io.flutter.plugin.common.StandardMessageCodec.readValueOfType(StandardMessageCodec.java:434)
E/DartMessenger( 5002):     at io.flutter.plugins.googlemobileads.AdMessageCodec.readValueOfType(AdMessageCodec.java:319)
E/DartMessenger( 5002):     at io.flutter.plugin.common.StandardMessageCodec.readValue(StandardMessageCodec.java:340)
E/DartMessenger( 5002):     at io.flutter.plugin.common.StandardMethodCodec.decodeMethodCall(StandardMethodCodec.java:51)
E/DartMessenger( 5002):     at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:260)
E/DartMessenger( 5002):     at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/DartMessenger( 5002):     at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$DartMessenger(DartMessenger.java:319)
E/DartMessenger( 5002):     at io.flutter.embedding.engine.dart.-$$Lambda$DartMessenger$TsixYUB5E6FpKhMtCSQVHKE89gQ.run(Unknown Source:12)
E/DartMessenger( 5002):     at android.os.Handler.handleCallback(Handler.java:883)
E/DartMessenger( 5002):     at android.os.Handler.dispatchMessage(Handler.java:100)
E/DartMessenger( 5002):     at android.os.Looper.loop(Looper.java:237)
E/DartMessenger( 5002):     at android.app.ActivityThread.main(ActivityThread.java:7830)
E/DartMessenger( 5002):     at java.lang.reflect.Method.invoke(Native Method)
E/DartMessenger( 5002):     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
E/DartMessenger( 5002):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1040)
E/flutter ( 5002): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: MissingPluginException(No implementation found for method loadRewardedAd on channel plugins.flutter.io/google_mobile_ads)
E/flutter ( 5002): #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:165:7)
E/flutter ( 5002): <asynchronous suspension>
E/flutter ( 5002): #1      RewardedAd.load (package:google_mobile_ads/src/ad_containers.dart:1154:5)
E/flutter ( 5002): <asynchronous suspension>
E/flutter ( 5002): 

我已经在MainActivity上登了这段代码

 override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
    GeneratedPluginRegistrant.registerWith(flutterEngine);
}

我还确保把这个放在build.gradle上

implementation 'com.google.android.gms:play-services-ads:21.1.0'

我还将此添加到清单文件中。

<meta-data
       android:name="com.google.android.gms.ads.APPLICATION_ID"
       android:value="ca-app-pub-3940256099942544~3347511713" />

这是我的实现

我在主菜上加了这个

final initFuture = MobileAds.instance.initialize()；adState = AdState(initFuture)；

并为AdState创建了另一个文件

static String get rewardedAdUnitId {
  if (Platform.isAndroid) {
    return "ca-app-pub-3940256099942544/5224354917";
  } else if (Platform.isIOS) {
    return "ca-app-pub-3940256099942544/1712485313";
  } else {
    throw new UnsupportedError("Unsupported platform");
  }
}

未来的初始化；

AdState(this.initialization)；

论我的实施

void loadRewardedAd(BuildContext context)  {
RewardedAd.load(
    adUnitId: AdState.rewardedAdUnitId,
    request: const AdRequest(),
    rewardedAdLoadCallback:
    RewardedAdLoadCallback(onAdLoaded: (ad) {
      ad.show(
          onUserEarnedReward: (ad,rewardPoints){
            CommonTools.showMessage(context, 'Energy Received : ');
          }
      );

      ad.fullScreenContentCallback = FullScreenContentCallback(
          onAdShowedFullScreenContent: (ad){

          },
          onAdFailedToShowFullScreenContent: (ad,error){
            CommonTools.showMessage(context, 'Ads Not Available For Now');
            ad.dispose();
          },
          onAdDismissedFullScreenContent: (ad){
            CommonTools.showMessage(context, 'Ads Not Available For Now');
            ad.dispose();
          }
      );

    }, onAdFailedToLoad: (er) {
      CommonTools.showMessage(context, 'Ads Not Available For Now');
    }));

}

Answer 1

在使这个问题给我带来创伤后，我设法使它发挥作用。我所做的就是在MaterialApp中包装所有的东西，并在我的主Widget上放置路径。

runApp(
    MaterialApp(
      routes: <String, WidgetBuilder>{
        '/': (BuildContext context) => MyApp()
      },
    ),
  );

至于它是如何工作的，我不知道它是如何解决所有问题的，但如果您遇到这个问题，它可能会对您有所帮助。

Answer 2

上面的主要活动代码是kotlin的。确保你的主要活动也在科特林。