How to Populate ListView from List Array in Flutter App
Introduction
Flutter is a popular framework for building natively compiled applications for mobile, web, and desktop. One of the essential widgets in Flutter is the ListView, which is used to display a list of children. In this article, we will discuss how to populate a ListView from a List array in a Flutter app.
Understanding ListView
A ListView is a widget that displays a list of children in a scrolling box. It can be used to display a list of items, such as text, images, or custom widgets. The ListView widget has several properties, including the children property, which is used to specify the list of children to be displayed.
Creating a List Array
Before populating a ListView, we need to create a List array that contains the data to be displayed. In Dart, a List array can be created using the List class. For example, we can create a List array of strings as follows:
“`dart
List
“`
Populating ListView from List Array
To populate a ListView from a List array, we need to use the ListView.builder property, which is used to create a ListView with a custom builder function. The builder function is called for each item in the List array, and it returns a widget that is displayed in the ListView. Here is an example code snippet that demonstrates how to populate a ListView from a List array:
“`dart
import ‘package:flutter/material.dart’;
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
MyHomePageState createState() => MyHomePageState();
}
class _MyHomePageState extends State
List
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(‘ListView Example’),
),
body: ListView.builder(
itemCount: dataList.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(dataList[index]),
);
},
),
);
}
}
“`
Customizing ListView Items
We can customize the appearance of ListView items by using a custom widget. For example, we can create a custom widget that displays an image and a text label. Here is an example code snippet that demonstrates how to create a custom ListView item:
“`dart
class CustomListItem extends StatelessWidget {
final String imageUrl;
final String text;
CustomListItem({this.imageUrl, this.text});
@override
Widget build(BuildContext context) {
return ListTile(
leading: Image.network(imageUrl),
title: Text(text),
);
}
}
“`
Handling Item Taps
We can handle item taps by using the onTap property of the ListTile widget. Here is an example code snippet that demonstrates how to handle item taps:
“`dart
ListView.builder(
itemCount: dataList.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(dataList[index]),
onTap: () {
print(‘Item tapped: ${dataList[index]}’);
},
);
},
)
“`
Conclusion
In this article, we discussed how to populate a ListView from a List array in a Flutter app. We also covered how to create a custom List array, populate a ListView, and handle item taps. With this knowledge, you can create a Flutter app that displays a list of items and handles user interactions.
FAQ
1. What is a ListView in Flutter?
A ListView is a widget that displays a list of children in a scrolling box.
2. How do I create a List array in Dart?
You can create a List array in Dart using the List class.
3. How do I populate a ListView from a List array?
You can populate a ListView from a List array by using the ListView.builder property.
4. Can I customize the appearance of ListView items?
Yes, you can customize the appearance of ListView items by using a custom widget.
5. How do I handle item taps in a ListView?
You can handle item taps in a ListView by using the onTap property of the ListTile widget.
