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Editorial Team
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Asked: 2026-05-24T00:55:09+00:00

I am working on an idea for an app and want to really understand

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I am working on an idea for an app and want to really understand what role threads and services will play in my application. In a very simple app, I want a list view to be updated once a week from some sort of database. Ballpark 100 items. So from what I think i understand so far, I will have an activity which will have a UI consisting of a list view. I will then have a service. In this service I will have a thread, and this thread will be in charge of downloading. The service is there simply to make sure the download can continue if the app is paused or stopped. Then I can use a message/runnable/asyncTask to send this data over to my activity/UI from my thread. Am I right in thinking this?

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  1. Editorial Team

    I think you missed a BroasdCastReceiver:

    I want a list view to be updated once a week

    For this task you’ll need to install an Alarm. Alarms usually start Broadcast receivers, to be sure that phone isn’t sleeping. This BroadcastReceiver will have to start your service. I know it sounds complicated, but its quite ok to implement 🙂

    Here are my comments for the remaining questions:

    I will have an activity which will have a UI consisting of a list view

    Correct

    I will then have a service. In this service I will have a thread, and this thread will be in charge of downloading.

    Thats also correct.

    Then I can use a message/runnable/asyncTask to send this data over to my activity/UI from my thread.

    That will maybe fail, because your service doesn’t know if the main activity is running. Whats about writing the lists data into a shared file, both service and activity can access?

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