The session reinitializes everytime the screen rotates, autocomplete keeps trying to remove the space before commas (pro tip: add two spaces before commas), but who cares. I CAN PROGRAM ON MY PHONE. suzuki, thank you, thank you for semi-arc.
 Without submitting to some arbitrary bureaucratic process that makes me not even want to try.
I don't know if onSaveInstanceState() is really possible to implement well without serializable continuations, but other Android REPLs work pretty well (particularly Ruboto IRB!), so you might find some ideas there.
"autocomplete keeps trying to remove the space before commas"
Autocomplete ruins my day too. ^_^ You might be able to go to "Settings > Language & keyboard" to configure it. If it still happens after that, installing a new keyboard oughta help. At least it'll give you a fresh set of quirks to deal with. :-p
I admit, it's pretty cool, but I have wonder what it is you're planning to do with it that would make you run around in your underpants scaring your girlfriend... Lol... So can you fill us in on your plans or is it a hush hush world domination kinda thing?
I am also asking to get people brainstorming on the possibilities, for when I sat down to think about what I could do with it I came up with nothing... So I think I'm lacking creativity or inspiration this week!
At least part of the excitement was in the fact that I didn't have to go through an 'app marketplace'. When everything about modern devices seems to involve jumping through endless hoops, it was a relief to have a nice experience.
Sometimes you have to use it for a while, and wait for ideas to form..
Just download the apk, (push to your android phone if you download to your computer), and in your phone file manager, press the apk. It should offer to install, if you've allowed non-market apps on your phone. If not, enable non-market apps and it should then work.
Note: I've also added Semi-Arc to our Arc Lang Wiki.