Disable sound from NotificationChannel

Question

Today I started targeting API 26 which forced me to use Notification Channels.

My problem is that now on each new notification (including updates to it) an annoying

Answer 1

No need to use .setSound(null, null)

just use below code

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this,
                getString(R.string.notification_channel_id))
                .setContentTitle("Audio Recording")
                .setContentText("recording in progress")
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
                .setSmallIcon(R.mipmap.ic_launcher);

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

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(
                    getString(R.string.notification_channel_id), "AOD+", NotificationManager.IMPORTANCE_LOW
            );
            channel.setDescription("Call Recorder is running");
            channel.setShowBadge(true);
            channel.canShowBadge();
            channel.setLightColor(Color.GREEN);
            channel.enableVibration(false);

            assert notificationManager != null;
            notificationManager.createNotificationChannel(channel);
        }

        assert notificationManager != null;
        startForeground(256/* must be greater than 0*/, notificationBuilder.build()); //I am using this for audio recording
        //notificationManager.notify(0, notificationBuilder.build());