int getVisibility() {
        return options.optBoolean("androidLockscreen", true) ? NotificationCompat.VISIBILITY_PUBLIC : NotificationCompat.VISIBILITY_SECRET;
    }
Gets the visibility for the notification.
Defaults to {@link NotificationCompat.VISIBILITY_PUBLIC} if not set.
@return {@link NotificationCompat.VISIBILITY_PUBLIC} or {@link NotificationCompat.VISIBILITY_SECRET}
src/android/Options.java