如何解决android中的重复文件异常？

Question

我正在尝试使用Firebase 制作聊天应用程序。代码似乎很好，但在尝试运行项目时遇到了一个奇怪的错误。

这是错误：

Error:FAILURE: Build failed with an exception.
Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.
> com.android.build.api.transform.TransformException:com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/LICENSE
File1: C:\Users\Aadesh\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-annotations\2.2.2\285cb9c666f0f0f3dd8a1be04e1f457eb7b15113\jackson-annotations-2.2.2.jar
File2: C:\Users\Aadesh\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-databind\2.2.2\3c8f6018eaa72d43b261181e801e6f8676c16ef6\jackson-databind-2.2.2.jar
File3: C:\Users\Aadesh\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-core\2.2.2\d20be6a5ddd6f8cfd36ebf6dea329873a1c41f1b\jackson-core-2.2.2.jar


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可能是什么问题，我该如何解决？

Gradle 文件：

apply plugin: 'com.android.application'

android {
compileSdkVersion 24
buildToolsVersion "25.0.0"
defaultConfig {
    applicationId "com.example.aadesh.chatnow"
    minSdkVersion 17
    targetSdkVersion 24
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.android.volley:volley:1.0.0'
testCompile 'junit:junit:4.12'
compile 'com.firebase:firebase-client-android:2.5.2'
}
apply plugin: 'com.google.gms.google-services'

Answer 1

你应该添加：

 android {
     packagingOptions { 
         exclude 'META-INF/LICENSE.txt'
         exclude 'META-INF/NOTICE.txt'
         exclude 'META-INF/LICENSE'
         exclude 'META-INF/NOTICE'
     }
 } 

到您的build.gradle 文件。这将在合并库时跳过这些文件。