Android Proguard build Duplicate Zip

Question

In my android application i have multiple third party libraries in libs folder

ex -: httpcore-4.2.4.jar , httpmime-4.2.5.jar,twitter4j-core-4.0.1.jar

these libraries are not duplicated and i'm pretty sure with that , but when i create the proguard release i get this error

(Duplicate zip entry [twitter4j-core-4.0.1.jar:META-INF/MANIFEST.MF])
.... (This error occurs for all of the library(libs)

I refereed this link to overcome with issue , i tried every option of it , but no luck with that ,

Proguard warnings "can't write resource [META-INF/MANIFEST.MF] (Duplicate zip entry)"

Is there any way to specify filters on the input jar

Answer 1

Your libraries are not duplicated, but some info files inside of several libraries are.

The best solution is to include in your build.gradle. inside the "android" section something like this:

android{
 packagingOptions {
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LGPL2.1'

    }
}

By the error message that you included here I will guess that adding this exclude will solve your problem:

exclude "META-INF/MANIFEST.MF"