Android开发 com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-.

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\Vincent\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-databind\2.4.3\feff63199be7b8f495c2f3e2096dcb6bd5e5b0b3\jackson-databind-2.4.3.jar    File2: C:\Users\Vincent\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-annotations\2.4.0\d6a66c7a5f01cf500377bd669507a08cfeba882a\jackson-annotations-2.4.0.jar    File3: C:\Users\Vincent\.gradle\caches\modules-2\files-2.1\com.fasterxml.jackson.core\jackson-core\2.4.3\4cb3dbb0c2f75b51aa7543c53252989785a0c609\jackson-core-2.4.3.jar

解决方案：
在app的build.gradle的android{}中添加：

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