Generate one set of Javadocs for two Android libraries in the same project

Question

I'm developing an Android SDK that is composed of two Android libraries: core and ui. Currently both have their build.gradle files where I have a task to build the javadocs for both.

What I would like to do is to have only one task in the parent directory build.gradle file so that only one set of javadocs is generated.

Any idea how to do this with Gradle?

Thanks!