Frank, if my AsyncTask is located in my Service, how can I use it to
update the UI in my Activity? I'm a bit confused by this- I thought
the AsyncTask would have to be located inside the Activity class in
order to update the UI within the Activity.
On Jan 21, 8:20 pm, Frank Weiss
Streets of Boston, please forgive my ignorance. If I use AsyncTask
within a service to retrieve data once, can I destroy the AsyncTask
after? Or would I have to destroy the entire Service?
Additionally, if I want to poll, say, every 5 minutes, wouldn't having
AsyncTask in the service be a good
If the AsyncTask finishes executing, the thread on which the asynctask
was run just waits (Object.wait()).
The AsyncTask is based upon the ExecutorService and FutureTask classes
from the java.util.concurrent packages.
Creating a new AsyncTask does not create a new thread. An AsyncTask is
executed
If your Service is running in the same process as your Activity, use a
static reference to your Activity.
E.g. MyActivity.ACTIVE_INSTANCE
Be sure to update the ACTIVE_INSTANCE in onCreate (set it to 'this')
and onDestroy (set it to 'null'). This will work when you can have
only one instance of
That's right. If you start an AsyncTask from a Service, you can't use the UI
thread methods of the AsyncTask to access the UI thread. Many of the usages
of AsyncTask are from an Activity, not a Service. They are used to respond
to user events that would take too long to process in the UI thread,
A Service, like an Activity, has a main thread with a message-loop.
You can create an AsyncTask in the onX() callbacks of Services,
just like in an Activity. The onPostExecute can do your handling of
the results, as you described.
However, AsyncTask is more geared towards the one-time
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