main.dart

import 'package:flutter/material.dart';

class Demo extends StatefulWidget {
  @override
  DemoState createState() => new DemoState();
}

class DemoState extends State<Demo> with TickerProviderStateMixin {

  @override
  Widget build(BuildContext context) {
    ThemeData themeData = Theme.of(context);
    return new ListView.builder(
      itemBuilder: (BuildContext context, int index) {
        return new Container(
          child: new Text("Foo $index", style: themeData.textTheme.display2),
        );
      },
    );
  }
}

void main() {
  ScrollController _scrollController = new ScrollController(
    initialScrollOffset: 150.0,
  );
  runApp(new MaterialApp(
    home: new NestedScrollView(
      controller: _scrollController,
      headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
        return <Widget>[
          new SliverAppBar(
            title: new Text('NestedScrollView demo'),
            expandedHeight: 300.0,
            pinned: true,
          ),
        ];
      },
      body: new Material(
        child: new Demo(),
      ),
    )
  ));
}