title: ListView with multiple Adapters and SectionIndexers
body: <p>I have an activity that contains a <code>ListView</code> that can be populated by different adapters. 
  Every adapter that may populate the list is an instance of a specific class, and every one of those classes implements the <code>SectionIndexer</code> interface.
  I have enabled <code>FastScroll</code> in my listview, and it works fine the first time I use <code>ListView.setAdapter(Adapter X)</code>. However, when I use <code>ListView.setAdapter(Adapter Y)</code>, It still uses the previous adapter's <code>SectionIndexer</code> (Adapter X).<br>
  How can I "reset" the <code>ListView</code>'s <code>SectionIndexer</code>?</p>