import 'package:flutter/material.dart';

    void main() {

        Widget getPage(){
            return new ListView.builder(
                itemBuilder: ((context, index){
                    return new ListTile(
                        title: new Text('Item $index')
                    );
                }),
            );
        }

        runApp(
            new MaterialApp(
                home: new DefaultTabController(
                    length: 2,
                    child: new Scaffold(
                        body: new NestedScrollView(
                            headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
                                return <Widget>[
                                    new SliverAppBar(
                                        floating: true,
                                        bottom: new TabBar(
                                            tabs: [
                                                new Tab(text: 'tab1'),
                                                new Tab(text: 'tab2'),
                                            ],
                                        ),
                                    ),
                                ];
                            },
                            body: new TabBarView(
                                children: [
                                    getPage(),
                                    getPage(),
                                ],
                            ),
                        ),
                    ),
                ),
            ),
        );
    }