Kelas Drawer digunakan untuk membuat panel yang tampil secara horizontal dari samping layar yang terdapat link navigasi-navigasi di dalamnya.

Oke mari kita buat di file main.dart nya silahkan tambahkan kode berikut :

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  static const String _title = 'Contoh Navigasi Drawer';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: MyStatefulWidget(),
    );
  }
}

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

  @override
  _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State {
  int _selectedIndex = 0;
  static const TextStyle optionStyle =
      TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
  static const List _widgetOptions = [
    Text(
      'Index 0: Home',
      style: optionStyle,
    ),
    Text(
      'Index 1: Business',
      style: optionStyle,
    ),
    Text(
      'Index 2: School',
      style: optionStyle,
    ),
  ];

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Drawer Navigation'),
        backgroundColor: Colors.green,
      ),
      drawer: Drawer(
        child: ListView(
          padding: EdgeInsets.zero,
          children: const [
            DrawerHeader(
              decoration: BoxDecoration(
                color: Colors.green,
              ),
              child: Text(
                'Drawer Header',
                style: TextStyle(
                  color: Colors.white,
                  fontSize: 24,
                ),
              ),
            ),
            ListTile(
              leading: Icon(Icons.message),
              title: Text('Messages'),
            ),
            ListTile(
              leading: Icon(Icons.account_circle),
              title: Text('Profile'),
            ),
            ListTile(
              leading: Icon(Icons.settings),
              title: Text('Settings'),
            ),
          ],
        ),
      ),
    );
  }
}

Output :

Begitulah kira-kira cara membuat navigasi sederhana menggunakan flutter, semoga membantu😊