String id = "ид пользователя"
vkRequest = VKApi.friends().get(VKParameters.from(
                    VKApiConst.USER_ID,id,
                    VKApiConst.FIELDS, "id,first_name,last_name,sex,bdate,city",
               /* VKApiConst.COUNT, 100,*/
                    "order", "name"));

        vkRequest.executeWithListener(new VKRequest.VKRequestListener() {
            @Override
            public void onComplete(VKResponse response) {
                super.onComplete(response);

                VKUsersArray vkUsersArray = (VKUsersArray) response.parsedModel;

                for (VKApiUserFull user : vkUsersArray) {
                   System.out.println(user.id);
                }

            }

            @Override
            public void onError(VKError error) {
                super.onError(error);
            }
        });