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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