Tab bug demo

main.dart

import 'dart:async';
import 'package:flutter/material.dart';

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

class TabbedPage extends StatelessWidget {
  TabbedPage({ this.pageIndex, this.tabCount });

  final int pageIndex;
  final int tabCount;

  Widget build(BuildContext context) {
    return new DefaultTabController(
      length: tabCount,
      child: new Column(
        children: <Widget>[
          new Container(
            color: Theme.of(context).primaryColor,
            child: new TabBar(
              tabs: new List<Tab>.generate(tabCount, (int tabIndex) {
                return new Tab(text: 'Tab ${pageIndex}-${tabIndex}');
              }),
            ),
          ),
          new Expanded(
            child: new TabBarView(
              children: new List<Widget>.generate(tabCount, (int tabIndex) {
                return new Center(
                  child: new Text('View ${pageIndex}-${tabIndex}'),
                );
              }),
            ),
          ),
        ],
      ),
    );
  }
}

class MyHomePage extends StatelessWidget {

  Widget build(BuildContext context) {
    return new PageView(
      children: <Widget>[
        new Scaffold(
          appBar: new AppBar(
            title: new Text('Page 0'),
          ),
          body: new TabbedPage(pageIndex: 1, tabCount: 3),
        ),
        new Scaffold(
          appBar: new AppBar(
            title: new Text('Page 1'),
          ),
          body: new TabbedPage(pageIndex: 2, tabCount: 4),
        ),
      ],
    );
  }
}