For asynctask to deal with activity rotation, I find this solution: https://github.com/commonsguy/cw-android/blob/master/Rotation/RotationAsync/src/com/commonsware/android/rotation/async/RotationAsync.java . However, getlastnonconfigurationinstance() is deprecated in API level 13 ( http://developer.android.com/reference/android/app/Activity.html#getLastNonConfigurationInstance() ) and fragment is recommended. I think that fragment is more graceful than asynctask like the code mentioned above in terms of attaching to and detaching from an activity because fragment lifecycles manage them. Besides, fragment can be retained on rotation. Therefore, I take a look at * http://developer.android.com/guide/components/fragments.html*<http://developer.android.com/guide/components/fragments.html> and read "For an example activity that uses a fragment as a background worker, without a UI, see the FragmentRetainInstance.java sample." . After reading the source code of FragmentRetainInstance.java, I have question on this line "getFragmentManager().beginTransaction().add(android.R.id.content, new UiFragment()).commit();". It adds the UiFragment()) to the layout and starts the worker thread in RetainedFragment consequently. I would like to modify the worker thread to perform network operation according to user interaction. For example, when a user fire a View.OnClickListener event, I add the fragment in order to perform network operation. Is it okay to add the fragment multiple times if users fire more than one event? Will it lead to some side effect (to view hierarchy)? The other question, why synchronized (mThread) { mReady = false; mThread.notify(); } appears in both onDestroy() and onDetach()? Aren't they duplicate because the thread is gone when onDestroy() returns? Why try to stop the thead again in onDetach()?
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