code: @Override
  	public void getActivityByUser(SocializeSession session, long id, ActionListener listener) {
  		String userId = String.valueOf(id);
  		String endpoint = getEndpoint(userId);
  		listAsync(session, endpoint, listener);
  	}
docs: /*
  (non-Javadoc)
  @see com.socialize.api.action.activity.ActivitySystem#getActivityByUser(com.socialize.api.SocializeSession, long, com.socialize.listener.activity.ActionListener)