notificationOreo.java

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
   NotificationChannel channel = new NotificationChannel(CHANNEL_ID, "Default", NotificationManager.IMPORTANCE_DEFAULT);
        channel.setVibrationPattern(new long[0]);
        channel.enableVibration(false);
        channel.setSound(null,null);
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        if (notificationManager != null) {
            notificationManager.createNotificationChannel(channel);
        }
}