how to add new buddy in roster in xmpp

Hi i am using smack.jar.I am able to connect with gtalk using it.Using Roster.getentries() i can get my buddy list.But how can i add new friends to my buddyList开发者_运维问答.Is there any API smack exposes to add new users??

Thanks

I've been using this to create new contacts in a standard XMPP server (can't tell about gtalk):

  Roster roster = xmppConnection.getRoster();
  // jid: String, user: String, groups: String[]
  roster.createEntry(jid, user, groups);

In XMPP, adding is adding to your roster + subscribing to the user. Updating is just adding the user to your roster. Keep in mind the minutiae.