hey guys... Yes, we are working on the app for the Google OS.
As for Dry Fire, in theory, yes it would "work"... but unless you are using a laser trainer to verify point of impact, you could be doing WORSE than just wasting your time by 'practicing' the wrong thing. Even the laser training doesn't really get you practicing properly (no recoil management being the main reason) for defensive shooting.
-RJP