How Set Firebase Notification Channelid In Android O?

For API level 26 we have to set a channel id as a reference. I learned how to do it without a channelID and below there is my firebase messaging set-up code. But now for the new An

Solution 1:

What I did in an app before was to initialize the Notification Channels as soon as the app starts. So I added an init function in my Application class, like so:

@TargetApi(Build.VERSION_CODES.O)privatevoidinitNotificationChannels() {
        NotificationChannelpublicChannel=newNotificationChannel(
                Constants.NOTIFICATION_CHANNEL_PUBLIC,
                Constants.NOTIFICATION_CHANNEL_PUBLIC,
                NotificationManager.IMPORTANCE_DEFAULT);
        publicChannel.setDescription(Constants.NOTIFICATION_CHANNEL_PUBLIC);

        NotificationChanneltopicChannel=newNotificationChannel(
                Constants.NOTIFICATION_CHANNEL_TOPIC,
                Constants.NOTIFICATION_CHANNEL_TOPIC,
                NotificationManager.IMPORTANCE_DEFAULT);
        topicChannel.setDescription(Constants.NOTIFICATION_CHANNEL_TOPIC);

        NotificationChannelprivateChannel=newNotificationChannel(
                Constants.NOTIFICATION_CHANNEL_PRIVATE,
                Constants.NOTIFICATION_CHANNEL_PRIVATE,
                NotificationManager.IMPORTANCE_HIGH);
        privateChannel.setDescription(Constants.NOTIFICATION_CHANNEL_PRIVATE);
        privateChannel.canShowBadge();

        List<NotificationChannel> notificationChannels = newArrayList<>();
        notificationChannels.add(publicChannel);
        notificationChannels.add(topicChannel);
        notificationChannels.add(privateChannel);

        NotificationManagermNotificationManager=
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        if (mNotificationManager != null) {
            mNotificationManager.createNotificationChannels(notificationChannels);
        }
    }

Then in my FirebaseMessagingService, I made a function that gets the channelId when building notifications:

privateStringgetChannelId(String source) {
        if (!TextUtils.isEmpty(source)) {
            if (source.contains(Constants.TOPIC_PREFIX)) {
                return (TextUtils.equals((TOPIC_PREFIX + Constants.NOTIFICATION_CHANNEL_PUBLIC), source)) ?
                        Constants.NOTIFICATION_CHANNEL_PUBLIC : Constants.NOTIFICATION_CHANNEL_TOPIC;
            } else {
                returnConstants.NOTIFICATION_CHANNEL_PRIVATE;
            }
        } else {
            returnConstants.NOTIFICATION_CHANNEL_PUBLIC;
        }
    }

This caters to three types of notification that our app needs -- Public, Topic, and Private. You can specify the channels you need on your own.