Hi! i present here my project... it's under development (more news: https://twmapeditor.wordpress.com (https://twmapeditor.wordpress.com))... this is a tool for map makers of Teeworlds game.
With this app you can create or modify teeworlds maps online or offline... it can open/write .map files, render maps, connecto to teeworlds servers,... and other map maker stuff. I needed modify the SFML API a bit for get "ANativeActivity" and know the default folder for save edited and downloaded maps.
The app uses the 'native' teeworlds network implementation. For use it you need run a modified teeworlds server called "mapper" for connect it from this app and edit map collaborative (Up to 16 clients).
http://www.youtube.com/watch?v=gZoKvTO-oXk