dual-booting ubuntu and android on lenovo s10-3t

view story

http://askubuntu.com – I beginner ubuntu user, sorry for such question but I cannot find exact answer in a web. I have a problem with installing android on ubuntu. I have already ubuntu 12.04 installed (on ideapad lenovo s10-3t) but I didn't leave empty partition for android. Is it possible to separate it now or do I have to reboot ubuntu? thanks (HowTos)