Key ListView Flutter

ListView.builder[] is used to render long or infinite lists, especially lists of data fetched from APIs like products, news, messages, search results Only visible items of the lists are called to reduce resource [CPU, RAM] consumption and improve performance.

Example

1. Create a new Flutter project with the following:Advertisements

flutter create my_product_list

2. Remove all the default code in lib/main.dart and add the following:

import 'package:flutter/material.dart'; void main[] { runApp[const MyApp[]]; } class MyApp extends StatelessWidget { const MyApp[{Key? key}] : super[key: key]; @override Widget build[BuildContext context] { return MaterialApp[ // Hide the debug banner debugShowCheckedModeBanner: false, title: 'Kindacode.com', home: MyHomePage[], ]; } } class MyHomePage extends StatelessWidget { MyHomePage[{Key? key}] : super[key: key]; // Generate a dummy list final myProducts = List.generate[1000, [i] => 'Product $i']; @override Widget build[BuildContext context] { return Scaffold[ appBar: AppBar[ title: const Text['Product List'], ], body: Container[ // Use ListView.builder child: ListView.builder[ // the number of items in the list itemCount: myProducts.length, // display each item of the product list itemBuilder: [context, index] { return Card[ // In many cases, the key isn't mandatory key: UniqueKey[], child: Padding[ padding: const EdgeInsets.all[10], child: Text[myProducts[index]]], ]; }], ]]; } }

3. Run the project:

flutter run

The result:

Conclusion

AdvertisementsWeve examined a complete example of implementing a list view in Flutter with the ListView.builder constructor. If youd like to learn more new and interesting stuff about mobile development, take a look at the following articles:

• How to create a Filter/Search ListView in Flutter
• Working with ReorderableListView in Flutter
• Sorting Lists in Dart and Flutter [5 Examples]
• Flutter SliverList Tutorial and Example
• Flutter AnimatedList Tutorial and Examples

You can also check out our Flutter topic page or Dart topic page for the latest tutorials and examples.

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