Can I install Android 2.2 or 2.3 on a Samsung Omnia 2? I would like to install android 2.3 or 2.2 in my Samsung Omnia 2.

Could you tell me how should I do?
I think the Omnia 2 is a Windows phone normally? So it is very unlikely to have an official Android release for it. You're going to have to wait for someone to put together an unofficial release and hope that it's possible for them to get or write all the drivers, etc.

It looks like there was an attempt by some of the XDA people to port Android to the i8000 Omnia 2 back in February, but they hit problems because there were no Android devices using the i8000's ARM1176 S3C6410 CPU at the time.

Your best bet is going to be to keep an eye on (and offer to help out at) the Omnia II ROM Development sub-forum of XDA's Samsung Omnia II forums.