Android : Facebook friends probelm?

Hello Every one i am trying this code and i have problem with it problem is it is returning only single friends or registered friends

Code :

new Request(
                FacebookVariables.fbSession,
                "/me/friends",
                null,
                HttpMethod.GET,
                new Request.Callback() {
                    public void onCompleted(Response response) {
                        /* handle the result */
                        System.out.println("Friends Data "+response);
                    }
                }
            ).executeAsync();

FacebookVariables.fbSession, is my custom varibale