I am creating an Android client using socket not by Socket.io and node js is the server.
I need to know answers for this.

1.It is possible that i have asked?
2.Can socket.io can be implemented as an android client?
3.If socket.io not available, then show how to implement this by socket?
4.If possible then show how to implement?

One of the best solutions is to use socket.io-java-client which is fully android supported.

EDIT: If you're using socket.io 1 or later then use nkzawa socket.io-client.java