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我尝试在 flutter 中使用 AdMob 进行测试广告。我总是收到代码 3
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android/build.gradle

minSdkVersion 19
targetSdkVersion 33

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    implementation platform('com.google.firebase:firebase-bom:31.2.0')
    implementation 'com.google.firebase:firebase-analytics'
    implementation 'com.google.firebase:firebase-auth'
    implementation 'com.google.android.gms:play-services-auth:20.4.1'
    implementation 'com.google.android.gms:play-services-ads-identifier:18.0.1'
    implementation 'com.google.android.gms:play-services-gcm:17.0.0'
    implementation 'com.google.android.gms:play-services-ads:21.5.0'
}

应用程序/build.gradle

buildscript {
    ext.kotlin_version = '1.7.20'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:7.2.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.15'
    }
}


distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip


environment:
  sdk: '>=2.19.2 <3.0.0'

google_mobile_ads: ^2.3.0

...................................................... ................................ main.dart

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(); 
  await MobileAds.instance.initialize().then(
    (InitializationStatus status) {
      MobileAds.instance.updateRequestConfiguration(
        RequestConfiguration(
          tagForChildDirectedTreatment:
              TagForChildDirectedTreatment.unspecified, …