在gradle配置文件加入：
android {
packagingOptions {
exclude ‘META-INF/DEPENDENCIES.txt‘
exclude ‘META-INF/LICENSE.txt‘
exclude ‘META-INF/NOTICE.txt‘
exclude ‘META-INF/NOTICE‘
exclude ‘META-INF/LICENSE‘
exclude ‘META-INF/DEPENDENCIES‘
exclude ‘META-INF/notice.txt‘
exclude ‘META-INF/license.txt‘
exclude ‘META-INF/dependencies.txt‘
exclude ‘META-INF/LGPL2.1‘
}
}
在运行一次APP即可以成功编译。
Error:duplicate files during packaging of APK app/build/output/apk
原文：http://www.cnblogs.com/scaptain/p/4134790.html