title: Flutter: How to use RefreshIndicator with SliverAppBar
body: <p>I'm trying to add <code>RefreshIndicator</code> to <code>CustomScrollView</code>. Is it possible to do? Here is the code sample:</p>
  <pre><code>CustomScrollView(
    slivers: &lt;Widget&gt;[
      SliverAppBar(
        title: Text('POSTAPP'),
        centerTitle: true,
        floating: true,
        pinned: false,
      ),
      SliverList(
          delegate: SliverChildBuilderDelegate(
            _createPostItem,
            childCount: postRepo.posts.length,
        ),
      ),
    ],
  );
  </code></pre>