Yes, the compatibility package is open source. When you get it, you get full sources as well: <android-sdk-root>\android-compatibility\v4\src About ListActivity vs ListFragment. In my opinion, Fragments are all about re-use. It is fairly easy to dropt a Fragment into any activity and it will save you from re-coding it for each activity. Dropping in sub-activities (e.g. a ListActivity) into a main activity is not impossible, but hard to manage. Of course, you could just use a List*View* as well (e.g through an <include>, but that is just re-using the view, not any extra code supporting it.
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