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Notifications out of an AsyncTask  RSS feed

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Within an AsyncTask, I am making a REST call to retrieve data. Within that AsyncTask, I may encounter an exception which I would like to package up (the HTTP code) and inform the Activity, which based on the HTTP response code (Timeout, Unauthorized, etc), would display different messages to the user. What would be the best way to bubble that information up to the Activity for processing? I have looked at a number of different Android mechanisms such as Notification, Handler, etc but I can't seem to determine a good architectural direction for this situation.
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