How do you make a rosjava package installable?

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Several of the packages in rosjava_core can be installed via Gradle and Maven to the M2 repo. It's unclear to me how to add this capability to another package, however, since the only mention of an install target in rosjava_core/build.gradle is the line that reads:

defaultTasks 'install'

I tried adding this to android_core/build.gradle in order to install the android_gingerbread package, but it still gives the error:

Task 'install' not found in project ':android_gingerbread'.

I'd like to create some ROS-Android packages that build on this package but don't live in the android_core stack. I can't figure out how to avoid having to manually include the paths to the android_core packages in order to do this.

What's the right way to install/depend on these packages?