How to add additional fields into contacts screen

Hi

I'm trying to add few fields in contacts screen. That field can be Text/Number/Date/Dropdown fields.

I could nt get any clue on this, So please help me on this. Can someone post the sample code? I've seen some code snippets but couldn't get them (not able to understand since I'm very new to android).

I'm just started to learn android... So need some help.

Thanks,
P