I just released version 2.4.1 of Chess for Android with the following changes:
Ability to install application on SD card
Moved navigation buttons down
Few improvements to UCI engine support
To verify that UCI engine support works for third party engines as well (not just for BikJump), I downloaded sources of ZCT0.3.2500 (by Zach Wegner) and Crab1.0Beta (by Tord Romstad, Marco Costalba, Joona Kiiski, Adam Kleng) and compiled these "natively" for Android. Importing and playing the engines work fine.
As before, instructions on setting up an UCI engine are given at UCI for Android.