Duplicate files copied in APK META-INF/LICENSE

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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/LICENSE
File1: C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-databind\2.7.2\84ffa765dd258dbab8695963c41308b054f3a1cb\jackson-databind-2.7.2.jar
File2: C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-annotations\2.7.0\19f42c154ffc689f40a77613bc32caeb17d744e3\jackson-annotations-2.7.0.jar
File3: C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-core\2.7.2\8b8310381b690e317f5f0574e9b2dd7034778b4c\jackson-core-2.7.2.jar

解决方法：

build.gradle下添加

packagingOptions {    exclude 'META-INF/license.txt'  }

比如：

apply plugin: 'com.android.library'    android {    compileSdkVersion 21    buildToolsVersion "21.1.2"    defaultConfig {        minSdkVersion 14        targetSdkVersion 21        versionCode 1        versionName "1.0"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }    packagingOptions {        exclude 'META-INF/DEPENDENCIES'        exclude 'META-INF/NOTICE'        exclude 'META-INF/LICENSE'        exclude 'META-INF/LICENSE.txt'        exclude 'META-INF/NOTICE.txt'    }}dependencies {    compile fileTree(include: ['*.jar'], dir: 'libs')    compile 'com.android.support:appcompat-v7:+'    compile 'com.google.android.gms:play-services:6.5.87'    compile 'com.squareup.picasso:picasso:2.5.2'    compile 'com.mcxiaoke.volley:library:1.0.15'    compile 'com.google.code.gson:gson:2.2.4'    compile "org.apache.httpcomponents:httpcore:4.4.1"    compile "org.apache.httpcomponents:httpmime:4.3.6"}

参考：http://stackoverflow.com/questions/31912459/duplicate-lib-file-copied-in-apk-meta-inf-license-txt-error-in-android-studio

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