title: Custom Spinner Drop Down View Listener
body: <p>I have implemented a custom spinner which extends <code>BaseAdapter</code> and I have overridden <code>getView()</code> and <code>getDropDownView()</code> in that so as to have different views for spinner and drop down item.</p>
  
  <p>How do I get notified when drop down view of spinner is opened or closed?</p>
  
  <p>My Custom spinner class is like this :</p>
  
  <pre><code>public class CustomSpinnerAdapter extends ArrayAdapter&lt;String&gt; {
  
  @Override
  public View getView(int i, View view, ViewGroup viewGroup) {
  
  }
  
  @Override
  public View getDropDownView(int position, View convertView, ViewGroup parent){
  
  }
  </code></pre>