ListView.builder in Flutter: solved exercise with dynamic list

ListView.builder in Flutter: solved exercise

If you are looking for ListView.builder in Flutter, this solved exercise gives you a practical implementation pattern you can reuse in real projects.

Problem statement

Build a screen with:

  • a screen with 100 list items
  • index displayed in each row
  • smooth scrolling behavior

Flutter solution

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import 'package:flutter/material.dart';

void main() => runApp(const MaterialApp(home: ListPage()));

class ListPage extends StatelessWidget {
  const ListPage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('ListView.builder')),
      body: ListView.builder(
        itemCount: 100,
        itemBuilder: (context, index) {
          return ListTile(
            leading: CircleAvatar(child: Text('${index + 1}')),
            title: Text('Item ${index + 1}'),
            subtitle: const Text('Efficient rendering'),
          );
        },
      ),
    );
  }
}

Expected result

The list scrolls smoothly and only builds visible rows at runtime.

Common mistakes

  • Using ListView(children: ...) for large lists.
  • Skipping itemCount.
  • Running heavy logic inside itemBuilder.

Practical use

This is a core building block for feeds, catalogs, chats, and search results.

Guided practice and next step

FAQ

When should I choose ListView.builder?

Use it for medium or large lists where performance matters.

Can I combine it with pagination?

Yes. It is a common base for infinite scroll implementations.

Is this production-ready?

Yes. It is one of the most used patterns in real Flutter apps.