Multiple dex files define /BuildConfig, can't find the cause:

Question

I\'m using the new gradle build system and I\'m facing the following problem:

UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dex.DexException: Multiple dex file         


        

Answer 1

Add this to your build.gradle:

android {
    dexOptions {
        preDexLibraries = false
    }
}

I suppose this way there is no conflicting BuildConfig.java.

EDIT:

Why the above works: Android studio will first dex the libraries before dex-ing the app module. If you have a library module with the same package name as your app module, this 'pre-dexing' will result in the creation of a BuildConfig.java in the same package as for the app.

Note: 'pre-dexing' will slow down your build process a bit so I suggest that you change your library's package name instead.