我的Android进阶之旅------>解决：Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.

错误描述

今天在Android Studio项目中加入了jackson的开发包，编译运行时候，引发了如下的错误：

Error:Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.> com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/NOTICE    File1: D:\Code\XTCKuwoWatch\app\libs\jackson-core-2.4.4.jar    File2: D:\Code\XTCKuwoWatch\app\libs\jackson-databind-2.4.4.jar
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错误截图如下所示：

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解决办法

看起来是因为多个 jar 包里包含了同样的文件（NOTICE.txt），导致打包时因为担心相互覆盖问题而提示出错。 尝试下在 app 下的 build.gradle 中的 android 部分增加一段配置，如下面这段代码所示：

packagingOptions {        exclude 'META-INF/LICENSE'        exclude 'META-INF/NOTICE'    }
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• 没修改前的build.gradle文件

apply plugin: 'com.android.application'android {    compileSdkVersion 22    buildToolsVersion "22.0.1"    defaultConfig {        applicationId "com.oyp.csdn"        minSdkVersion 16        targetSdkVersion 23        versionCode 1        versionName "1.0"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }}dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])}
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• 修改后的build.gradle文件

apply plugin: 'com.android.application'android {    compileSdkVersion 22    buildToolsVersion "22.0.1"    packagingOptions {        exclude 'META-INF/LICENSE'        exclude 'META-INF/NOTICE'    }    defaultConfig {        applicationId "com.oyp.csdn"        minSdkVersion 16        targetSdkVersion 23        versionCode 1        versionName "1.0"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }}dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])}