正在获取“程序类型已存在：android.support.v4.app.LoaderManager”

Question

当我在我的应用程序上运行我的Android应用程序时，编译器给出以下错误

Program type already present: android.support.v4.app.LoaderManager
java.lang.RuntimeException: 
com.android.builder.dexing.DexArchiveMergerException: Error while merging 
dex archives: 
C:\Users\xxx\xxx\app\build\intermediates\transforms\dexBuilder\debug\1.jar,
com.android.tools.r8.CompilationFailedException: Compilation failed to 
complete 
com.android.tools.r8.utils.AbortException

implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
implementation 'com.android.support:support-v4:27.1.1'
implementation 'com.squareup.retrofit:retrofit:1.9.0'
implementation 'com.squareup.okhttp:mockwebserver:2.3.0'
implementation 'com.squareup.okhttp3:okhttp:3.10.0'
implementation 'org.codehaus.jackson:jackson-mapper-asl:1.9.13'
implementation 'com.android.support:recyclerview-v7:28.0.0'
implementation 'com.squareup.picasso:picasso:2.71828'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espressocore:3.0.2'
implementation 'com.android.support:cardview-v7:27.1.1'

Answer 1

尝试进入gradle脚本，在buildTypes{ }下的build.gradle中添加此行multiDexEnabled true，然后同步Gradle。

例如：

buildTypes {
   release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
      multiDexEnabled true
   }
}

Answer 2

如果您使用Google Play服务com.google.android.gms：play-services：... 将其更改为新版本，然后

清理并重建项目