Enable Proguard on Android Library Project

Question

I have a standalone Android Library Project and I would like to compile this project with Proguard enabled. I'm using Android Studio 1.0 and I have enabled Proguard with minifyEnabled true. However after a clean build I get the following error

Error:Execution failed for task ':test_sdk:proguardRelease'.
> java.io.IOException: The output jar is empty. Did you specify the proper '-keep' options?

Any idea on what I'm doing wrong ?

Answer 1

I added the following proguard rules

-keep public class * {
    public *;
}

-keepclassmembers class * {
    public *;
}

-keepattributes Exceptions,InnerClasses

It seems to work now