I want my app to access database every hour and read next record from the table then update desctop widget and send notification. I know that there is AlarmManager which I can use to register my Intents but they are deleted when the phone is turned off or rebooted.
Is there any other android class/service that I would update my application continuously even when I reboot my phone?
take a look at the demo applications provided with android sdk
the look at AlarmService_Service for the implementation of the service once the alarm has been triggered
put all of the background tasks you want to do in your app in
Services which perform tasks in the background. In the service you should be able to define a timer that causes whatever updates you want to occur every x hours.
onCreate() of the widget, start the service.
onCreate() is called every time that the widget comes to life (such as when the phone starts if it is on the home screen) and will therefore guarantee that the
Service is always running.
Hope this was helpful.
Just for the sake of completness, I am linking here the official docs, where the issue of the rebooting is adressed.