How to use new Android 2.0 Shrinker and set useProguard false?

Question

I upgraded to Android Studio 2.0 Beta 5. I'm using gradle tools 2.0.0-beta5. On the Android dev blogspot site, there is a video explaining how to use the new Shrinker for debug builds (at 3:14)

https://www.youtube.com/watch?list=PLWz5rJ2EKKc_w6fodMGrA1_tsI3pqPbqa&v=xxx3Fn7EowU

I'm trying to build my project with the debug buildType as explained in the video:

    debug {
        minifyEnabled true
        useProguard false
    }

I'm getting a bunch of warnings and then this this error when building:

Error:Execution failed for task 'app:transformClassesWithNewClassShrinkerForMyAppNameGoesHereDebug'.
Warnings found during shrinking, please use -dontwarn or -ignorewarnings to suppress them.

With Proguard, I would add the appropriate -dontwarn necessary in the proguard project file. Is there a Shrinker project file somewhere that I can add -dontwarn statements?

Answer 1

I found some documentation on this. Turns out it uses the same configuration files as Proguard. Here is the relevant part from the doc:

The built-in shrinker can only remove dead code, it does not obfuscate or optimize. It can be configured using the same files as ProGuard, but will ignore all flags related to obfuscation or optimization. Unlike ProGuard, we support using the built-in shrinker together with Instant Run.

Also, here is a sample configuration for reference:

buildTypes {
    debug {
        minifyEnabled true
        useProguard false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}