Android Display Notification with vibration

 private void displayNotification(String Number, String messages) {
        // TODO Auto-generated method stub
     // Invoking the default notification service
       

       
      mBuilder = new NotificationCompat.Builder(ctx);   
 // Get instance of Vibrator from current Context
    Vibrator v = (Vibrator) ctx.getSystemService(Context.VIBRATOR_SERVICE);

    // Vibrate for 400 milliseconds
    v.vibrate(400);
   
    String name=getContactName(ctx, Number);
    mBuilder.setContentTitle(name);
    mBuilder.setContentText(messages);
    mBuilder.setTicker("New Message Received!");
    mBuilder.setSmallIcon(R.drawable.ic_launcher);

    // Increase notification number every time a new notification arrives
    mBuilder.setNumber(++numMessagesOne);
   
    // Creates an explicit intent for an Activity in your app
    Intent resultIntent = new Intent(ctx, NavigationMain.class);
    resultIntent.putExtra("notificationId", notificationIdOne);

    //This ensures that navigating backward from the Activity leads out of the app to Home page
    TaskStackBuilder stackBuilder = TaskStackBuilder.create(ctx);
    // Adds the back stack for the Intent
    stackBuilder.addParentStack(ChatActivity.class);

    // Adds the Intent that starts the Activity to the top of the stack
    stackBuilder.addNextIntent(resultIntent);
    PendingIntent resultPendingIntent =
       stackBuilder.getPendingIntent(
          0,
          PendingIntent.FLAG_ONE_SHOT //can only be used once
       );
    // start the activity when the user clicks the notification text
    mBuilder.setContentIntent(resultPendingIntent);

    myNotificationManager = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);

    // pass the Notification object to the system
    myNotificationManager.notify(notificationIdOne, mBuilder.build());
    }