How to set AlertDialog to don't close clicking outside in flutter : <p>I built an AlertDialog to display Loading while i'm authenticating the user and when it finishes i pop it. </p>

<pre><code>Widget loadingDialog = new AlertDialog(
content: new Row(
  children: &lt;Widget&gt;[
    new CircularProgressIndicator(),
    Padding(
      padding: const EdgeInsets.only(left: 8.0),
      child: new Text("Loading..."),
    ),
  ],
),);
</code></pre>

<p>But, if the user taps outside the Dialog it closes. So when the auth finishes, it will still pop something (i guess the scaffol), breaking the app.
How can i make Dialog not closable? </p>
