I've always wondered about the usability of a chording keyboard with a smart phone's edge (or an xPad) and four areas under the fingers.
(Four buttons is quite few combinations. You probably need the thumb too, with two-three alternative buttons for it.)
It would be easy to have a learning mode which give feedback about possible combinations, since it is on a screen.
My only (hobby) programming for mobile has been on iOS, where the system keyboard isn't easily replaced. There seems to be things like this in the Android store? Anyone know why this didn't work well enough to be popular?
You might be interested in this[1] which was posted to HN some time ago. iOS is a no-go for this sort of thing for now at least, but I'm unfamiliar with Android. For hardware modules I think the thumbs work very well as a modal control, but on a small touch screen I don't know how it would work.
(They should have "Desktop version" and "iPad version" bigger on the page you linked. I browsed a bit before finding those. Can you buy hardware somewhere?)
(Four buttons is quite few combinations. You probably need the thumb too, with two-three alternative buttons for it.)
It would be easy to have a learning mode which give feedback about possible combinations, since it is on a screen.
My only (hobby) programming for mobile has been on iOS, where the system keyboard isn't easily replaced. There seems to be things like this in the Android store? Anyone know why this didn't work well enough to be popular?