private class AsyncCreateQueue extends AsyncTask<String, Integer,String> {
        ServiceApi serviceApi;
        List<InvitationImpl> invitations;
        public AsyncCreateQueue(ServiceApi serviceApi, List<InvitationImpl> invitations) {
            this.serviceApi = serviceApi;
            this.invitations = invitations;
        }

        @Override
        protected String doInBackground(String... arg) {
            try {
                serviceApi.createNewQueue(arg[0], arg[1],invitations);
            } catch (Exception e) {
                return e.getMessage();
            }
            return "ok";
        }
    }