I compiled Vladimir Medvedev's UCI engine GreKo for Android (ARM) for use in Chess for Android and put the binary on UCI engines for Android. Below results of a few quick matches with other engines on a Nexus S (1GHz Hummingbird) with 32MB hash and Nalimov/Gaviota/Scorpio endgame tablebases on SD card. For the interested, here is a screenshot.