void closeChatSession(String address) {
   ChatSessionManagerAdapter sessionManager =
       (ChatSessionManagerAdapter) mConn.getChatSessionManager();
   ChatSessionAdapter session = (ChatSessionAdapter) sessionManager.getChatSession(address);
   if (session != null) {
     session.leave();
   }
 }
 void updateChatPresence(String address, String nickname, Presence p) {
   ChatSessionManagerAdapter sessionManager =
       (ChatSessionManagerAdapter) mConn.getChatSessionManager();
   // TODO: This only find single chat sessions, we need to go through all
   // active chat sessions and find if the contact is a participant of the
   // session.
   ChatSessionAdapter session = (ChatSessionAdapter) sessionManager.getChatSession(address);
   if (session != null) {
     session.insertPresenceUpdatesMsg(nickname, p);
   }
 }