public void createNotification(String title, String body) {
        final int NOTIFY_ID = 1002;

        // There are hardcoding only for show it's just strings
        String name = "my_package_channel";
        String id = "my_package_channel_1"; // The user-visible name of the channel.
        String description = "my_package_first_channel"; // The user-visible description of the channel.

        Intent intent;
        PendingIntent pendingIntent;
        NotificationCompat.Builder builder;

        if (notifManager == null) {
            notifManager =
                    (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            int importance = NotificationManager.IMPORTANCE_HIGH;
            NotificationChannel mChannel = notifManager.getNotificationChannel(id);
            if (mChannel == null) {
                mChannel = new NotificationChannel(id, name, importance);
                mChannel.setDescription(description);
                mChannel.enableVibration(true);
                mChannel.setLightColor(Color.GREEN);
                mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
                notifManager.createNotificationChannel(mChannel);
            }
            builder = new NotificationCompat.Builder(this, id);

            intent = new Intent(this, MainActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
            pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

            builder.setContentTitle(title)  // required
                    .setSmallIcon(android.R.drawable.ic_popup_reminder) // required
                    .setContentText(body)  // required
                    .setDefaults(Notification.DEFAULT_ALL)
                    .setAutoCancel(true)
                    .setContentIntent(pendingIntent)
                    .setTicker(title)
                    .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
        } else {

            builder = new NotificationCompat.Builder(this);

            intent = new Intent(this, MainActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
            pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

            builder.setContentTitle(title)                           // required
                    .setSmallIcon(android.R.drawable.ic_popup_reminder) // required
                    .setContentText(body)  // required
                    .setDefaults(Notification.DEFAULT_ALL)
                    .setAutoCancel(true)
                    .setContentIntent(pendingIntent)
                    .setTicker(title)
                    .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
                    .setPriority(Notification.PRIORITY_HIGH);
        }

        Notification notification = builder.build();
        notifManager.notify(NOTIFY_ID, notification);
    }