How To Create Group Items Drawer Using Flutter Android App

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',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  static final List<String> _listViewData = [
    "Flutter",
    "Android",
    "Dart",
    "iOS",
  ];

  List<Column> _listOfGroup = List<Column>.generate(
    9,
        (i) => Column(
          mainAxisAlignment: MainAxisAlignment.start,
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
          Container(
            color: Colors.green[200],
            child: ListTile(title: Text("Group ${i + 1}")),
          ),
          Padding(
            padding: const EdgeInsets.only(left: 15.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: _listViewData
                  .map((data) => ListTile(
                title: Text(data),
              ))
                  .toList(),
            ),
          )
        ],
    ),
  );

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.green,
        title: Text("Group Items Drawer"),
      ),
      drawer: Container(
        width: 200,
        child: Drawer(
          child: Container(
            color: Colors.green,
            child: ListView(
              children: _listOfGroup
                  .map(
                    (data) => Container(child: data),
              )
                  .toList(),
            ),
          ),
        ),
      ),
      body: Center(
        child: Text('Main Body'),
      ),
    );
  }
}