如何在SilverAppBar中仅显示TabView

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {
  TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 2, vsync: this);
  }

  @override
  void dispose() {
    _tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: SilverAppBar(
        floating: true,
        flexibleSpace: FlexibleSpaceBar(
          background: Container(
            decoration: BoxDecoration(
              image: DecorationImage(
                image: AssetImage('assets/images/appbar_background.jpg'),
                fit: BoxFit.cover,
              ),
            ),
          ),
          title: Text('My App'),
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: [
          // 第一个Tab页面的内容
          Container(
            child: Center(
              child: Text('Tab 1'),
            ),
          ),
          // 第二个Tab页面的内容
          Container(
            child: Center(
              child: Text('Tab 2'),
            ),
          ),
        ],
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyHomePage(),
  ));
}