I used this code to send notification.
  public static void sendNotificationPhoto(Context context, Class<?> activityTarget)
        {
            Log.i( TAG , "Send Photo Notification");
            NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
            Notification notifyDetails = new Notification(R.drawable.ic_plusone_standard_off_client, "New Alert!", System.currentTimeMillis());
            Intent intent = new Intent(context, activityTarget);
            int id = NOTIFICATION_ID_PHOTO;
            String contentText = "Slave Picture Is Now Available!";
            PendingIntent contentIntent = PendingIntent.getActivity(context.getApplicationContext(), id, intent, PendingIntent.FLAG_ONE_SHOT);
            notifyDetails.setLatestEventInfo(context.getApplicationContext(), context.getString(R.string.app_name), contentText, contentIntent);
            mNotificationManager.notify(id, notifyDetails);
        }
But now i don't need to open another activity but a specific Gallery's folder. Is it possibile with notification?