@RequiresApi(21)
    public static List<Action> getInvisibleActions(Notification notification) {
        ArrayList<Action> result = new ArrayList<>();

        Bundle carExtenderBundle = notification.extras.getBundle(CarExtender.EXTRA_CAR_EXTENDER);
        if (carExtenderBundle == null) {
            return result;
        }

        Bundle listBundle = carExtenderBundle.getBundle(CarExtender.EXTRA_INVISIBLE_ACTIONS);
        if (listBundle != null) {
            for (int i = 0; i < listBundle.size(); i++) {
                result.add(NotificationCompatJellybean.getActionFromBundle(
                        listBundle.getBundle(Integer.toString(i))));
            }
        }
        return result;
    }
Returns the invisible actions contained within the given notification.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java