Clever Geek Handbook

Asynchronous re-scheduled task

How to create AsyncTask

one that continues to work after a certain period of time.

For example, receive data from the server every 5 minutes and notify the caller thread that it has received the data. I searched the forum but couldn't find many. So far, I realized that

1) The UI thread will call AsyncTask

2) onPrExecute

to access the UI thread before executing

3) OnPostExecute

to access the UI thread after execution

I don't need to show the update to the user. In addition, the task will be destroyed when the application is closed. Any tutorial for this will help him

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4 answers


As in the comments. So let me elaborate on this.

DO NOT USE AsyncTask. INSTEAD GO ONLY for IntentService.



  • Make class extends IntentService
  • Use an alert manager to trigger your own service intent with a specific action.
  • Define the interface that will be used to notify the client of this service.
  • Maintaining a list of this object's implementation of the interface provided by its client.
  • in onHandleIntent (intent intent) identifies the call by validating the action.

  • Initiate a fetch request directly for the intent as a workflow to work with, and in the call completion updates from the list of interface objects that you supported.

  • Make methods to allow the activity to register and unregister while listening for these updates.

  • Which actually adds the implementation of the interface they provided in the list you maintained and removes from it when you call unregister.
  • make sure the activity is registered in onResume and unregister in onPause.
  • Use re-alarm or trigger it again at the end of a single trigger. Hope this helps :)
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You can schedule a repetition AsyncTask

at a fixed rate using Timer.scheduleAtFixedRate .



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Try it.

- Better to use Service

to do the job over and over.

- You can now use tethered or unbound Service

. If you want the service to be limited to Activity, use Bound Service else to use UnBound Service.

- If it would be better to use IntentService

, since here you don't need the task to keep running, but starts after a certain time.

See this link:

http://mobile.tutsplus.com/tutorials/android/android-fundamentals-intentservice-basics/

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I wrote an app that launches AsyncTask

at a regular interval, except they persist even when the app is closed. Anyway, here's what I had to do:

  • Create PendingIntent

    (via getBroadcast()

    ) which contains Intent

    which contains action.
  • Put PendingIntent

    in the system AlarmManager

    and set the intervals.
  • Declare BroadcastReceiver

    in manifest to catch the action string specified Intent

    in no. 1.
  • In onReceive()

    your method, BroadcastReceiver

    run AsyncTask

    .
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