A: 

Even I encountered similar problem. I removed icu4j.jar from list of external JARs and it worked fine. Although I am not sure why this JAR is used in first place.

Anyways, have you tried to use any other reasoners for mobile apps and OWLs? I tried JESS but it seems to have some issues with porting.

Pramod
Well, removing the icu4j.jar helped me out as well, however I haven't found any other good OWL reasoners which are compatible with android.
Tyrone