How to Fetch Data from API and Show in Flutter ListView

Fetching data from an API and displaying that data in ListView is a common requirement of Flutter Apps. It’s because you can show a large set of dynamic data through the ListView widget easily.

In this Flutter tutorial, let’s use a sample API https://jsonplaceholder.typicode.com/albums that gives a set of data in JSON format.

Flutter listview json

First of all, install the http package into your project and add the dependency to your pubspec.yaml file.

dependencies:
  flutter:
    sdk: flutter
  http: ^0.13.5

Create a model class named Data and convert JSON response into Dart Object.

class Data {
  final int userId;
  final int id;
  final String title;

  Data({required this.userId, required this.id, required this.title});

  factory Data.fromJson(Map<String, dynamic> json) {
    return Data(
      userId: json['userId'],
      id: json['id'],
      title: json['title'],
    );
  }
}

Now, fetch the data from the API as given below.

Future<List<Data>> fetchData() async {
  var url = Uri.parse('https://jsonplaceholder.typicode.com/albums');
  final response = await http.get(url);
  if (response.statusCode == 200) {
    List jsonResponse = json.decode(response.body);
    return jsonResponse.map((data) => Data.fromJson(data)).toList();
  } else {
    throw Exception('Unexpected error occured!');
  }
}

Then show the fetched data in ListView.

FutureBuilder<List<Data>>(
      future: fetchData(),
      builder: (context, snapshot) {
        if (snapshot.hasData) {
          return ListView.builder(
              itemCount: snapshot.data!.length,
              itemBuilder: (BuildContext context, int index) {
                return Container(
                  height: 75,
                  color: Colors.white,
                  child: Center(
                    child: Text(snapshot.data![index].title),
                  ),
                );
              });
        } else if (snapshot.hasError) {
          return Text(snapshot.error.toString());
        }
        // By default show a loading spinner.
        return const CircularProgressIndicator();
      },
    )

Following is the complete Flutter example of ListView that shows fetched data from API.

import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

void main() {
  runApp(const MyApp());
}

Future<List<Data>> fetchData() async {
  var url = Uri.parse('https://jsonplaceholder.typicode.com/albums');
  final response = await http.get(url);
  if (response.statusCode == 200) {
    List jsonResponse = json.decode(response.body);
    return jsonResponse.map((data) => Data.fromJson(data)).toList();
  } else {
    throw Exception('Unexpected error occured!');
  }
}

class Data {
  final int userId;
  final int id;
  final String title;

  Data({required this.userId, required this.id, required this.title});

  factory Data.fromJson(Map<String, dynamic> json) {
    return Data(
      userId: json['userId'],
      id: json['id'],
      title: json['title'],
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Flutter ListView'),
        ),
        body: const MyStatefulWidget());
  }
}

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

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  @override
  Widget build(BuildContext context) {
    return FutureBuilder<List<Data>>(
      future: fetchData(),
      builder: (context, snapshot) {
        if (snapshot.hasData) {
          return ListView.builder(
              itemCount: snapshot.data!.length,
              itemBuilder: (BuildContext context, int index) {
                return Container(
                  height: 75,
                  color: Colors.white,
                  child: Center(
                    child: Text(snapshot.data![index].title),
                  ),
                );
              });
        } else if (snapshot.hasError) {
          return Text(snapshot.error.toString());
        }
        // By default show a loading spinner.
        return const CircularProgressIndicator();
      },
    );
  }
}

Following is the output of the above example.

Flutter fetch data listview

I hope this Flutter tutorial will be helpful for you.

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