androidstudio中报错：duplicate files copied in apk meta-inf/License.txt
解决办法是在build.gradle加入：
android { packagingOptions { exclude 'META-INF/DEPENDENCIES'exclude 'META-INF/NOTICE'exclude 'META-INF/LICENSE'exclude 'META-INF/LICENSE.txt'exclude 'META-INF/NOTICE.txt' }
}