title: How to Show an Local image till the NetworkImage() Loads Up in flutter?
body: <pre><code>            new CircleAvatar(
                                backgroundColor: Colors.black87,
                                backgroundImage: new NetworkImage(url),
                                radius: 45.0,
                              )
  </code></pre>
  <p>I Want to show a local image in <code>CircleAvatar</code> until the <code>NetworkImage</code> fully loads from the internet.</p>