smack - how to add new buddy in roster in xmpp -

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hi using smack.jar.i able connect gtalk using it.using roster.getentries() i can buddy list.but how can add new friends buddylist.is there api smack exposes add new users??

thanks

i've been using create new contacts in standard xmpp server (can't tell gtalk):

  roster roster = xmppconnection.getroster();   // jid: string, user: string, groups: string[]   roster.createentry(jid, user, groups);

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