android - 如何解决[ fatal error ]:序言中不允许包含内容？

Question

我正在构建一个应用程序，一切运行顺利。我的代码没有问题。
但是，只要在我的依赖项中添加“实现'com.google.android.gms:play-services-ads:19.1.0'”并进行同步，就会下载以下错误文件，并且gradle构建失败。

详细介绍

[Fatal Error] lifecycle-livedata-core-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] core-runtime-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] core-runtime-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] lifecycle-livedata-core-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] lifecycle-livedata-core-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] core-runtime-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] lifecycle-livedata-core-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] core-runtime-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] lifecycle-livedata-core-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] core-runtime-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] lifecycle-livedata-core-2.0.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] core-runtime-2.0.0.pom:2:1: Content is not allowed in prolog.

 Calling mockable JAR artifact transform to create file: C:\Users\Lenovo\.gradle\caches\transforms-2\files-2.1\dcf80f3e2f930bc6fa39c90f6616fd81\android.jar with input C:\Users\Lenovo\AppData\Local\Android\Sdk\platforms\android-28\android.jar

如果我的依存关系不写'com.google.android.gms:play-services-ads:19.1.0'，一切都可以

这是我的项目级别build.gradle

         buildscript {
          repositories {
           jcenter()
           google()

       }
    dependencies {
    classpath 'com.android.tools.build:gradle:3.4.0'

    classpath 'com.google.gms:google-services:4.3.3'
    }
 }

       allprojects {
        repositories {
         jcenter()
        google()
     }
       }

 task clean(type: Delete) {
delete rootProject.buildDir
 }

这是我的应用程序级别build.gradle

apply plugin: 'com.android.application'

android {

compileSdkVersion 28
buildToolsVersion '28.0.3'
defaultConfig {
    applicationId 'com.dictionary.anglobangla'
    minSdkVersion 21
    targetSdkVersion 28
    versionCode 1
    versionName "1.0.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    debug {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
    release {
        shrinkResources true
        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

    }
}
lintOptions {
    disable 'MissingTranslation'
}
productFlavors {
}
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_7
    targetCompatibility JavaVersion.VERSION_1_7
}

}

   dependencies {
   implementation fileTree(include: ['*.jar'], dir: 'libs')
   androidTestImplementation('com.android.support.test.espresso:espresso-core:2.3-alpha', {
    exclude group: 'com.android.support', module: 'support-annotations'
   })
   implementation 'com.google.android.gms:play-services-ads:19.1.0'
   implementation 'com.android.support:appcompat-v7:28.0.0'
  implementation 'com.android.support:design:28.0.0'
   testImplementation 'junit:junit:4.13'
}

我尝试提供实现“com.google.android.gms:play-services-ads:17.1.0”，但仍然无法正常工作。

注意:我没有输入任何代码，因为所有代码运行平稳，没有广告依赖性。我也不能实现广告，因为gradle构建失败。

Answer 1

最终，经过如此多的搜索，我找到了答案的解决方案。

在项目级别构建gradle。

使

   buildscript {
      repositories {
       jcenter()
       google()

   }

如

 buildscript {
      repositories {
        google()
       jcenter()


   }

并删除

 .gradle\caches
// go to the folder where your project is located and delete
 .gradle
 .idea
 all iml files
 //if build folder is located in app folder delete it.