> I am working on a program which consists of two parts
>
> Service component will read various system features (CPU usage, RAM
> usage, Number of Running Tasks, Messages Sent, Calls Made etc) every
> pre determined time interval lets say 15 minutes. And save these
> readings/data in a database.
>
> Activity component will read the data from SQL database file and
> process the information.
>
> My Questions are
>
> 1. What kind of service do I have to create that will stay alive
> forever until stopped by the activity it should also automatically
> restart after system reboot?
You don't. For work every 15 minutes, you use AlarmManager and an IntentService.
> 2. Has anyone got an example of service writing data to database?
That would be no different than writing data to a database from
anywhere else in an Android app.
> 3. Can I invoke the parent activity from the service?
Services do not have a parent activity.
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