Android handler question

I have an application that needs to update a ongoing_event notification. The notification has a progress bar that i need to increment every 5 minutes. I use Handlers but something about it bothers me or i simply dont understand how they work.

      if (progress<=24)
           {

    contentView.setProgressBar(R.id.status_progress,24,progress,false);
    Toast.makeText(getApplicationContext(),progress, Toast.LENGTH_SHORT).show();
    progress++;
    mnNotificationManager.notify(IS_PARKED_ID, notification);
    mHandler.postDelayed(mUpdateTimeTaskProgressbar, 300000);

           }

here is the code. It appears that when the device screen is off the notification isn't being updated. I have used Handlers in the past but as i can recall i had them updating on every 100 milisec. So my question is, is the handler somehow paused, s开发者_Python百科top and restarted or is it something else. And do you have some suggestion like wake_lock. Thanks in advance, Simon

EDIT: Forgot to mention this is all running from a service

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From time to time the gc runs to free up memory on your device. If running from the UI thread, your notification's updater might get collected as well.

I'm using a service for showing ongoing notifications, this way i can be sure, that neither the service nor the notification doesn't get stopped / collected.

The communication between my activities and the service i solved with handlers, but there are plenty of techniques for that too.

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By default, the handler run in the same process of the UI thread, so I think you'd better use a service to update the progress bar. In this case, you want to update the UI for every 5 minute. You can use AlarmManager to start an alarm service to achieve this.