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 private void customnotification2() {

        SMTNotificationChannel.Builder smtBuilder = new SMTNotificationChannel.Builder(
                "1234",
                "test",
                NotificationManager.IMPORTANCE_HIGH
                );

//To set the description to the channel add below method.
        smtBuilder.setChannelDescription("Harish testing");

//To set the group ID to the channel add below method. (Make sure that before setting group ID here, that group must be created before. Check the code below)
       // smtBuilder.setChannelGroupId("<Group_ID>");

//To set sound to channel, add below method. (Note that sound name must be without extention.)
        smtBuilder.setNotificationSound("viettel_sound");

        SMTNotificationChannel smtNotificationChannel = smtBuilder.build();

        SmartPush.getInstance(new WeakReference<>(this)).createNotificationChannel(smtNotificationChannel);

    }