Flutter Navigation Drawer

main.dart

import 'package:flutter/material.dart';

void main() => runApp(new Keeper());

class Keeper extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Keeper',
      home: new KeeperDrawer(),
    );
  }
}

class KeeperDrawer extends StatelessWidget {	
  Drawer drawer = new Drawer();
  
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      drawer: drawer,
      appBar: new AppBar(
        title: new Text('Keeper'),
      ),
      body: new Center(
        child: new Text('Hello World!')
      )
    );
  }
}