相关疑难解决方法(0)

我正在尝试实施 adMob，但我的应用程序没有启动并提供以下错误：

java.lang.RuntimeException: Unable to get provider com.google.android.gms.ads.MobileAdsInitProvider: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.ads.MobileAdsInitProvider" on path: DexPathList[[zip file "/data/app/com.aaron.derrystudios.wordresolver-mOF2EngPcA5nT8dd27zx5g==/base.apk"],nativeLibraryDirectories=[/data/app/com.aaron.derrystudios.wordresolver-mOF2EngPcA5nT8dd27zx5g==/lib/arm64, /system/lib64]]
    at android.app.ActivityThread.installProvider(ActivityThread.java:7369)
    at android.app.ActivityThread.installContentProviders(ActivityThread.java:6909)
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6826)
    at android.app.ActivityThread.access$1400(ActivityThread.java:267)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1981)
    at android.os.Handler.dispatchMessage(Handler.java:107)
    at android.os.Looper.loop(Looper.java:237)
    at android.app.ActivityThread.main(ActivityThread.java:7762)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1047)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.ads.MobileAdsInitProvider" on path: DexPathList[[zip file "/data/app/com.aaron.derrystudios.wordresolver-mOF2EngPcA5nT8dd27zx5g==/base.apk"],nativeLibraryDirectories=[/data/app/com.aaron.derrystudios.wordresolver-mOF2EngPcA5nT8dd27zx5g==/lib/arm64, /system/lib64]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:196)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    at android.app.AppComponentFactory.instantiateProvider(AppComponentFactory.java:147)
    at android.app.ActivityThread.installProvider(ActivityThread.java:7353)
    at android.app.ActivityThread.installContentProviders(ActivityThread.java:6909) 
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6826) 
    at android.app.ActivityThread.access$1400(ActivityThread.java:267) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1981) 
    at android.os.Handler.dispatchMessage(Handler.java:107) 
    at android.os.Looper.loop(Looper.java:237) 
    at android.app.ActivityThread.main(ActivityThread.java:7762) 
    at …

apply plugin: 'com.android.application'
   android {
   compileSdkVersion 28

   defaultConfig {
      applicationId "com.kaiboon0216gmail.homeownerstarterkit"
      minSdkVersion 21
      targetSdkVersion 28
      versionCode 1
      versionName "1.0"
      testInstrumentationRunner 
      "android.support.test.runner.AndroidJUnitRunner"
    } 
    buildTypes {
       release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
       }
    }
}


dependencies {
   implementation fileTree(dir: 'libs', include: ['*.jar'])
   implementation 'com.android.support:appcompat-v7:28.0.0'
   implementation 'com.android.support.constraint:constraint-layout:1.1.3'
   testImplementation 'junit:junit:4.12'
   androidTestImplementation 'com.android.support.test:runner:1.0.2'
   androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
   implementation 'com.android.support:cardview-v7:28.0.0'
   implementation 'com.google.android.gms:play-services-ads:17.1.1'
}

这些是我的代码。我正在使用Admob在我的应用中显示广告。当我添加以下代码时：“ 'com.google.android.gms：play-services-ads：17.1.1'”并同步我的应用崩溃。

之后，我转到Admob官方网站，发现此版本适用于'com.android.support:appcompat-v7:26.1.0'版本。但是，当我将compileSdkVersion更改为26时，我的应用仍然崩溃。

我已经测试了没有以下代码的代码：“ 'com.google.android.gms：play-services-ads：17.1.1'”并且它可以运行。我确定此代码是问题所在，但我不知道如何改正它。

谁能帮助解决我的问题？谢谢。