Ahhh if only kitty would pee in a cup!!! Couple of suggestions:
1. Empty all the litter out of the box and hope kitty goes in it.
2. Use a product called NoSorb. It is tiny black pellets that you use instead of litter. When your kitty urinates in it, the urine pours right off the pellets. This way you can just tip the litter box and watch the pee pee roll right into the container given. (again, hopefully)
3. If kitty is too reluctant to do either of these, a trip to the v.e.t. is necessary. Provide access to water but no box for a little while so kitty's bladder can get full. With a full bladder the Dr. can squeeze kitty's bladder to get the urine out. (note: some kitties do not like this procedure and will fight you all the way)
4. If all else fails, a cystocentesis will be needed. Another trip to the vet. The Dr. will draw out the urine from kitty's bladder with a syringe. (again kitty needs somewhat of a full bladder).
Unfortunatley, getting a urine sample from a cat sucks.
hope this was some help!!