public static String getChannelId(Notification notification) {
        if (Build.VERSION.SDK_INT >= 26) {
            return notification.getChannelId();
        } else {
            return null;
        }
    }
@return the ID of the channel this notification posts to.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java