How To Scroll Listview To Top Or Bottom Using Flutter Android

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  MyHomePageState createState() {
    return new MyHomePageState();
  }
}

class MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {
  @override
  ScrollController _scrollController;
  bool _isOnTop = true;

  @override
  void initState() {
    super.initState();
    _scrollController = ScrollController();
  }

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

  _scrollToTop() {
    _scrollController.animateTo(_scrollController.position.minScrollExtent,
        duration: Duration(milliseconds: 1000), curve: Curves.easeIn);
    setState(() => _isOnTop = true);
  }

  _scrollToBottom() {
    _scrollController.animateTo(_scrollController.position.maxScrollExtent,
        duration: Duration(milliseconds: 1000), curve: Curves.easeOut);
    setState(() => _isOnTop = false);
  }

  final List<String> _listViewData = [
    "Flutter",
    "Android",
    "Laravel",
    "Core Java",
    "Html",
    "Php",
    "Jquery",
    "Flutter",
    "Android",
    "Laravel",
    "Core Java",
    "Html",
    "Php",
    "Jquery",
    "Flutter",
    "Android",
    "Laravel",
    "Core Java",
    "Html",
    "Php",
    "Jquery",
    "Flutter",
    "Android",
    "Laravel",
    "Core Java",
    "Html",
    "Php",
    "Jquery",
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.pink[900],
          title: Text('Scroll to Top / Bottom'),
        ),
        body: ListView(
          controller: _scrollController,
          padding: EdgeInsets.all(10.0),
          children: _listViewData
              .map((data) => ListTile(
            leading: Icon(Icons.favorite,color: Colors.grey,),
            title: Text(data),
          ))
              .toList(),
        ),
        floatingActionButton: FloatingActionButton(
          backgroundColor: Colors.pink[900],
          onPressed: _isOnTop ? _scrollToBottom : _scrollToTop,
          child: Icon(_isOnTop ? Icons.arrow_downward : Icons.arrow_upward),
        ));
  }
}