Plumble is an enhanced Mumble client for Android with the goal of replicating the full functionality of the desktop version.
See this page on the wiki for compilation instructions.
https://github.com/Morlunk/Plumble/wiki/Building-Plumble
Plumble is also available for purchase on Google's Play store. All proceeds go to furthering development of the app.
https://play.google.com/store/apps/details?id=com.morlunk.mumbleclient