안드로이드 8.0부터 생긴 알림 채널의 이름이 "Miscellaneous"에서 제가 설정한 이름으로 바뀌지 않습니다. 아래는 제가 만든 알림을 처리하는 클래스입니다.

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    final String TAG = "FCM Service";

    @Override
    public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {

        // Handle FCM messages here.

        Log.d(TAG, "From: " + remoteMessage.getFrom());

        if (remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());
             sendNotification(remoteMessage);
        }
    }

    @Override
    public void onNewToken(@NonNull String token) {
        Log.d(TAG, "Refreshed token: " + token);
    }

    private void sendNotification(RemoteMessage remoteMessage) {

        String title = remoteMessage.getData().get("title");
        String message = remoteMessage.getData().get("message");

        String channelId = "version";
        String channelTitle = "New version";

        Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder =
                new NotificationCompat.Builder(this, channelId)
                .setSmallIcon(R.drawable.ic_bookmark_border_list)
                .setContentTitle(title)
                .setContentText(message)
                .setAutoCancel(true)
                .setSound(defaultSoundUri);

        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            // Make notification channel
            NotificationChannel channel = new NotificationChannel(channelId, channelTitle,
                    NotificationManager.IMPORTANCE_HIGH);
            channel.setDescription("새 버전이 있을 때마다 알려줍니다.");
            channel.enableLights(true);
            channel.setLightColor(Color.GREEN);
            channel.enableVibration(true);
            channel.setVibrationPattern(new long[]{100, 200, 100, 200});
            channel.setName("새 버전");
            channel.setShowBadge(true);

            Objects.requireNonNull(notificationManager).createNotificationChannel(channel);
        }

        Objects.requireNonNull(notificationManager).notify(0, notificationBuilder.build());
    }
}

다들 새해 복 많이 받으시고 벌써 연휴 마지막 날이네요 ㅠ 화이팅!!