Maybe keep a list of my votes in the application cache and check against that as well as the ihackernews API? Same with my comments, too. I would really enjoy if it appeared to have read-your-writes consistency.
Yes, that's probably what I'll do in the interim. I'll have to figure out how to do these checks efficiently. Scrolling lists in Android is already clunky due to the way rows are rendered, so I'll need to make sure to not make it worse by checking the entire 'already-voted-list' for each row.