在build.gradle中与compileSdkVersion **、buildToolsVersion “**.**.*"或defaultConfig 同级添加如下代码
packagingOptions{
exclude ‘META-INF/LICENSE.txt‘
exclude ‘META-INF/NOTICE.txt‘
}
AndrdoidStudio 2个jar包引起的异常Duplicate files copied in APK META-INF/LICENSE.txt
原文：http://www.cnblogs.com/wangoublog/p/5391052.html