On Tue, Sep 28, 2010 at 7:14 AM, Jose Luis Montes <[email protected]> wrote: > What I do not understand is what do you want to mean with this: >> >> Due to possible activity configuration >> >> changes (e.g., orientation), it is probably better to have these tasks >> >> coordinated via a regular Service, but you could have an Activity >> >> manage its own if you are careful. > > Can you explain yourself a bit more??
There have been a few threads on this topic recently in this list. In a nutshell: -- Make sure your AsyncTask classes are not regular inner classes of the activity. Either make them static inner classes or use fully-separate classes. -- Manually associate your activity with the AsyncTask initially (e.g., via its constructor). -- Return the AsyncTask object via onRetainNonConfigurationInstance(). -- In onCreate() of your Activity, check getLastNonConfigurationInstance() and re-associate your activity with any AsyncTasks in there (e.g., via a setter). Here is a sample project demonstrating this: http://github.com/commonsguy/cw-android/tree/master/Rotation/RotationAsync/ Android guarantees that no messages on the message queue will be dispatched between onRetainNonConfigurationInstance() of your old activity and onCreate() of your new activity. Hence, even if your AsyncTask invokes publishProgress() or wraps up its doInBackground() work, you are assured that your AsyncTask's onProgressUpdate() and onPostExecute() methods will not be called while the configuration change is happening. This adds a bit of complexity, which is why some people will be more comfortable having a Service (or, conceivably, a custom Application object) manage the AsyncTasks. -- Mark Murphy (a Commons Guy) http://commonsware.com | http://github.com/commonsguy http://commonsware.com/blog | http://twitter.com/commonsguy Android Training in Atlanta: http://bignerdranch.com/classes/android -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
