 Back in the <code>onCreate</code> method, construct a new
<code>NotesDbAdapter</code>
      instance and assign it to the <code>mDbHelper</code> field (pass
      <code>this</code> into the constructor for <code>DBHelper</code>)
    </li>
    <li>
      Call the <code>open()</code> method on <code>mDbHelper</code> to open (or create) the
      database.
    </li>
    <li>
      Finally, call a new method <code>fillData()</code>, which will get the data and
      populate the ListView using the helper &mdas