loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {

            GraphRequest request = GraphRequest.newMeRequest(
                    loginResult.getAccessToken(),
                    new GraphRequest.GraphJSONObjectCallback() {
                        @Override
                        public void onCompleted(
                                JSONObject object,
                                GraphResponse response) {
                            // Application code

                            try {
                                JSONObject jsonObject = new JSONObject(response.toString());



                            } catch (JSONException e) {
                                e.printStackTrace();
                            }catch (NullPointerException e){

                            }



                        }
                    });
            Bundle parameters = new Bundle();
            parameters.putString("fields", "id,name,email,gender, birthday");
            request.setParameters(parameters);
            request.executeAsync();

        }



        @Override
        public void onCancel() {
            Log.e("facebook","canceled");
        }

        @Override
        public void onError(FacebookException e) {

            Log.e("facebook error",e.getMessage().toString());
        }
    });

{Response:  responseCode: 200, graphObject: {"id":"931177080295510","birthday":"06/24/1991","gender":"male","email":"smemamian@yahoo.com","name":"Masoud Emamian"}, error: null}