@Override public void onLocationUpdate(Map<String, User> reply) { NotificationManager mNotificationManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE); NotificationCompat.Builder myBuilder = new NotificationUtil().prepareBuilder(mContext); myBuilder.setNumber(reply.size()); // mId allows you to update the notification later on. mNotificationManager.notify(NotificationUtil.NOTIFICATION_ID, myBuilder.build()); for (User user : reply.values()) { passiveLocationController.addProximityAlert(user); } }