Oh... I expected... It looks like a HTML5 application in embedded browser...The Freeciv-web android application is just a simple web wrapper app which brings up a web browser to play.freeciv.org.
No, only interested in the technical solution... I'm developing a (Civilization like) game with OpenGL and WebGL. I started it the same way (HTML5 and Javascript in embedded browser) on Android and dropped this technology because the poor performance and lack of mobile integration...So are you perhaps interested in becoming a contributor to Freeciv-web?