I want to Develop A mobile app in android for like facebook.
Can anyone suggest me any company and the cost of the App?

I worry here. Why? Because what LookChup claims to be, wouldn't your network offer such today?
Also, there are so many app dev houses in India, are you saying you wouldn't use any? Why?

Or this could be the new old problem of OVERCHOICE (google that word.) There must be close to a million small to large app developers out there today. Ask a few.