Generate sample list with flutter

generateList.dart

import 'dart:math';

import 'package:flutter/material.dart';

class GenerateList extends StatefulWidget {
  const GenerateList({super.key});

  @override
  State<GenerateList> createState() => _GenerateListState();
}

class _GenerateListState extends State<GenerateList> {
  List<Map> generatedList = [];

  @override
  void initState() {
    super.initState();
    generateList();
  }

  void generateList() {
    generatedList = List<Map>.generate(
        20,
        (i) => {
              'username': 'tom$i',
              'email': 'tom$i@example.com',
              "mobiles": List<String>.generate(
                  2, (index) => "9999${Random().nextInt(1000000)}"),
              "isOnline": Random().nextBool()
            });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Generate Random List"),
      ),
      body: SingleChildScrollView(
        child: Column(
          children: [
            generatedList.isNotEmpty
                ? ListView.builder(
                    shrinkWrap: true,
                    physics: const NeverScrollableScrollPhysics(),
                    itemCount: generatedList.length,
                    itemBuilder: (context, index) => Column(
                          children: [
                            Column(
                              children: [
                                ListTile(
                                  leading: const Icon(Icons.account_circle),
                                  title: Text(generatedList[index]["username"]),
                                  trailing: Icon(
                                    Icons.circle,
                                    color: generatedList[index]["isOnline"]
                                        ? Colors.green
                                        : Colors.red,
                                    size: 15,
                                  ),
                                  subtitle: Text(generatedList[index]["email"]),
                                )
                              ],
                            ),
                            const SizedBox(
                              height: 10,
                            ),
                          ],
                        ))
                : Container(),
          ],
        ),
      ),
    );
  }
}