WaniKani at Android Speed
Description:Google Play Store Link
Well, I said I'd do it, so here it is: the Android counterpart to WaniKani at Terminal Speed.
For those of you who have played BrainSpeed on smart.fm, this is very very much like it. A term is displayed and you must choose the corresponding answer within a time limit. The more consecutive answers you get right, the shorter the time limit becomes.
You should be careful with using this tool as it will interfere with the concept of learning by Spaced Repetition.
I'd only advise using it for Burned items, even though you can select lower levels.
Tested on a Galaxy Nexus, Nexus 7, and emulator running Gingerbread.
Make sure you have a solid data connection when Synchronizing, otherwise weird things might happen...