Sample cod for issue

debugui.dart

import 'package:flutter/material.dart';

typedef double GetOffsetMethod();
typedef void SetOffsetMethod(double offset);

class DebugUiPage extends StatefulWidget {
  DebugUiPage({Key key}) : super(key: key);

  @override
  _DebugUiPageState createState() => new _DebugUiPageState();
}

class _DebugUiPageState extends State<DebugUiPage>
    with SingleTickerProviderStateMixin {
  PageController _pageController;
  int _page = 0;

  @override
  void initState() {
    super.initState();
    _pageController = new PageController();
  }

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

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        appBar: new AppBar(
            title: new Text("Hello")
        ),
        bottomNavigationBar: new BottomNavigationBar(
          items: [
            new BottomNavigationBarItem(
                icon: new Icon(Icons.map),
                title: new Text("Lorem")
            ),
            new BottomNavigationBarItem(
                icon: new Icon(Icons.pin_drop),
                title: new Text("Borem")
            ),
            new BottomNavigationBarItem(
                icon: new Icon(Icons.people),
                title: new Text("Ipsum")
            )
          ],
          currentIndex: _page,
          onTap: navigationTapped,
        ),
        body: new PageView(
            onPageChanged: onPageChanged,
            controller: _pageController,
            children: <Widget>[
              new ListView.builder(itemBuilder: getBuilder, itemCount: 100),
              new Container(color: Colors.yellow),
              new Container(color: Colors.blue)
            ]
        )
    );
  }

  void navigationTapped(int index) {
    _pageController.animateToPage(
        index,
        duration: const Duration(milliseconds: 300),
        curve: Curves.ease
    );
  }

  void onPageChanged(int value) {
    setState(() {
      this._page = value;
    });
  }
}


Widget getBuilder(BuildContext context, int index) {
  return new Card(
      child: new Container(
          padding: new EdgeInsets.all(16.0),
          child: new Text("Item value $index")
      )
  );
}