title: Delete group on ExpandableListView
body: <p>i have a big problem. I want to delete a group from a <strong>ExpandableListView</strong> and then "update list" with <strong>notifyDataSetChange</strong>.
  I have this code:</p>
  
  <pre><code>db.deleteMarket(name); // remove group from database
  expandableListDetail.remove(expandableListTitle.get(groupPos)); //remove from list
  ((BaseExpandableListAdapter) expandableListAdapter).notifyDataSetChanged();
  </code></pre>
  
  <p>The system successfully removes the group from the database, but it still appears and I need to restart the application to update.
  How can I update directly right after deletion?</p>