Just what I expected, an uninspired port. The interface is.. terrible..
https://play.google.com/store/search?q=Calculator%2B%2B&...
Also look at how Maple 16 does it. The keyword here is 'buttons'.
However, connectbot is 676 precious K of storage vs 22 megs for the native port, and I can do a lot more once connected via connectbot than just octave. I can't afford to use the native port, which is too bad.