Android examples on Galactic

[tr-marlow]

Hello, I've been trying to get the ROS2 Java Android examples running on Galactic, but seem to be running into multiple issues.
I followed #194 which finally got the gradle plugin building.
I followed #208 up to manually populating the gradle.properties with the required members.

My current issue is:
Configuration with name 'compile' not found.
when I try to build. This seems to be a gradle versioning issue, perhaps? I'm using gradle 7.2.1, as gradle 7 was required for other dependency issues further up the stack.

Does anyone have any thoughts on how to fix this?