SubhrajyotiSen

val notificationManager: NotificationManagerCompat = 
  NotificationManagerCompat.from(context)
val channel: NotificationChannelCompat? = 
  notificationManager.getNotificationChannelCompat(channelId)

SubhrajyotiSen

@Nullable
public NotificationChannelCompat getNotificationChannelCompat(@NonNull String channelId) {
    if (Build.VERSION.SDK_INT >= 26) {
        NotificationChannel channel = getNotificationChannel(channelId);
        if (channel != null) {
            return new NotificationChannelCompat(channel);
        }
    }
    return null;
}