How to scroll to the beginning / end of the ListView

flutter Scroll Controller

import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(home: new MyApp()));

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  var mylist = List.generate(500, (i) => "Flutter $i");

  var _controller = ScrollController();
  var _controller2 = ScrollController();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          _controller.animateTo(0.0,
              curve: Curves.easeInOut, duration: Duration(seconds: 1));
          _controller2.animateTo(_controller.position.maxScrollExtent,
              curve: Curves.easeInOut, duration: Duration(seconds: 1));
        },
      ),
      body: Row(
        children: <Widget>[
          Expanded(
            child: ListView(
              controller: _controller,
              children: mylist.map((item) {
                return ListTile(
                  leading: FlutterLogo(),
                  title: Text(item),
                );
              }).toList(),
            ),
          ),
          Expanded(
            child: ListView(
              controller: _controller2,
              children: mylist.map((item) {
                return ListTile(
                  leading: FlutterLogo(
                    colors: Colors.red,
                  ),
                  title: Text(item),
                );
              }).toList(),
            ),
          ),
        ],
      ),
    );
  }
}