title: Alert Dialog on onTap on ListTile
body: <p>How can I create a AlertDialog by clicking/tapping on ListTile.
  Currently I'm doing this and nothing happens when it's clicked.</p>
  
  <pre><code>body: ListView(
          children: &lt;Widget&gt;[
            ListTile(
              title: Text('Theme'),
              onTap: (){
                AlertDialog(
                  title: Text('Hi'),
                );
              },
            )
          ],
        ),
  </code></pre>
  
  <p>PS: I'm a noob, please go easy on me.</p>