I have a Python based build system that I use to build C++ apps for Android with NDK. I think it uses Ant (and Python), but if you need a breakdown of all the various configuration files I needed to setup if it might help.
After asking openly and directly to Mark for months and getting zero response, as Mark was entirely in on Monkey 2, I got frustrated and backburnered MX because Android was a deadend for the type of apps I was building. So I went back to C++ and sorted out a simple command line based system to build apps easily.
If CX takes up the reins and adds an NDK based target, I'll do backflips because I have projects I'd love to resurrect without porting to C++.