The only direct way that I found is to email the PDF roster to your android email acct. Then you have to have a PDF viewer installed. That is only as good as the time you "print" your roster.
Now if Geneva had a a simple method of outputting your roster as a .ics file then it would be simple. It's all a matter of formatting. If you have someone in your IT dept who knows how to access the data behind Geneva then you will be half way there.
A sample ICS entry for an all day event on the 2nd April
BEGIN:VEVENT
UID:Rgntkk
DTSTART;VALUE=DATE:20120402
DTEND;VALUE=DATE:20120403
CATEGORIES:Roster
SUMMARY:R05 (0500-1700)
END:VEVENT