thread inside IntentService stop updating Notification

Question

i have intentservice associate with geofence. service is called a notification send and inside service their is a thread which update the notification after 10 sec.

here is code:

 @Override
protected void onHandleIntent(Intent intent) {
sendNotification("enter",2);

t=new Thread(new Runnable() { @Override public void run() { try {

                                    Thread.sleep(10000);


                                    sendNotification("PICK",2);



                                }
                                catch (Exception e)
                                {
                                    Log.e("ERROR",e.toString());
                                }
                            }
                        });
                        t.start();

}

here is send notification code

private void sendNotification(String notificationDetails,String itineraryID) { // Create an explicit content Intent that starts the main Activity. Intent notificationIntent = new Intent(getApplicationContext(), Detail.class); notificationIntent.putExtra("ID",ItineraryID);

    // Construct a task stack.
    TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);

    // Add the main Activity to the task stack as the parent.
    stackBuilder.addParentStack(Detail.class);

    // Push the content Intent onto the stack.
    stackBuilder.addNextIntent(notificationIntent);

    // Get a PendingIntent containing the entire back stack.
    PendingIntent notificationPendingIntent =
            stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

    // Get a notification builder that's compatible with platform versions >= 4
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

    // Define the notification settings.
    builder.setSmallIcon(R.drawable.to_chegando_icon)
            // In a real app, you may want to use a library like Volley
            // to decode the Bitmap.
            .setLargeIcon(BitmapFactory.decodeResource(getResources(),
                    R.drawable.to_chegando_icon))
            .setColor(Color.RED)
            .setContentTitle("Saida da Escola"+ itineraryID)
            .setContentText(notificationDetails)
            .setContentIntent(notificationPendingIntent);

    // Dismiss notification once the user touches it.
    builder.setAutoCancel(true);

    // Get an instance of the Notification manager
    NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    // Issue the notification
    int n=Integer.parseInt(itineraryID);
    mNotificationManager.notify(n, builder.build());
}`

this work fine create notification and update it after 10 second.

the problem is when i create a notification and then kill the app from background(press home button and then kill app from background apps) then this thread doesnot update the notification. why is that ??? any solution