Hm. The taskwarrior app I use daily is gone from the Play Store.
The author now offers something called TaskwarriorC2 that may have similar functionality, with a different UI spirit.
Edit: I just installed TaskwarriorC2 and got it working (by hand-copying my hard-won profile configuration from original taskwarrior (pem files, taskrc, etc., the whole profile directory)) from kjv.task/files/ over to the com.taskwc2/files/ directory on the phone. Editing the taskrc file is currently broken for me, so if I hadn't already had one, configuration would have been daunting.
Now that TaskwarriorC2 is working: If you're a taskwarrior poweruser, the interface is awesome. If you'd never used taskwarrior before, it would seem inscrutable.