private void setNotification(String reminderTitle, String reminderId) {
int num = Integer.parseInt(SharePrefUtils.getString(Constant_ad.currentNotificationId, “0”));
num++;
SharePrefUtils.putString(Constant_ad.currentNotificationId, String.valueOf(num));

    NotificationManager notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
    NotificationCompat.Builder notificationBuilder;
    Log.e("getVibrateStatus", SharePrefUtils.getBoolean(Constant_ad.IS_VIBRATE, false) + "");

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID, getString(R.string.channel_name)
                , NotificationManager.IMPORTANCE_HIGH);
        notificationChannel.setDescription(getString(R.string.channel_description));
        notificationChannel.enableLights(true);
        notificationChannel.setLightColor(Color.RED);
        if (SharePrefUtils.getBoolean(Constant_ad.IS_VIBRATE, false)){
            notificationChannel.setVibrationPattern(new long[]{0, 1000, 500, 1000});
        }

// notificationChannel.enableVibration(true);
notificationChannel.enableVibration(SharePrefUtils.getBoolean(Constant_ad.IS_VIBRATE, false));
notificationManager.createNotificationChannel(notificationChannel);
}

    notificationBuilder = new NotificationCompat.Builder(this, CHANNEL_ID);

    notificationBuilder.setAutoCancel(true)
            .setDefaults(Notification.DEFAULT_ALL)
            .setWhen(System.currentTimeMillis())
            .setSmallIcon(R.mipmap.ic_launcher)
            .setPriority(Notification.PRIORITY_MAX)
            .setContentTitle(getString(R.string.notification_ctitle))
            .setContentText(reminderTitle);

    Intent notifyIntent = new Intent(this, RemindersActivity.class);
    notifyIntent.putExtra("type", "notificationData");
    notifyIntent.putExtra("id", reminderId);
    notifyIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);

    int contentIntentFlags = PendingIntent.FLAG_CANCEL_CURRENT;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
        contentIntentFlags |= PendingIntent.FLAG_IMMUTABLE;
    PendingIntent pendingIntent = PendingIntent.getActivity(this, Integer.parseInt(SharePrefUtils.getString(Constant_ad.currentNotificationId, "0"))
            , notifyIntent, contentIntentFlags);
    notificationBuilder.setContentIntent(pendingIntent);

    notificationManager.notify(Integer.parseInt(SharePrefUtils.getString(Constant_ad.currentNotificationId, "0"))
            , notificationBuilder.build());
}

Here is my notification function.