How to fetch data from the internet in Flutter?

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In Flutter, you typically fetch data from the internet (e.g., APIs, JSON data, etc.) using the http package.
Here’s a step-by-step explanation with an example:

---

1. Add Dependency

Open your pubspec.yaml and add:

dependencies:
  flutter:
    sdk: flutter
  http: ^1.2.0   # check pub.dev for latest version

Then run:

flutter pub get

---

2. Import the Package

import 'package:http/http.dart' as http;
import 'dart:convert'; // for JSON decoding

---

3. Make a GET Request

Example: Fetching data from a JSON API (https://jsonplaceholder.typicode.com/posts)

Future<List<dynamic>> fetchPosts() async {
  final response =
      await http.get(Uri.parse('https://jsonplaceholder.typicode.com/posts'));

  if (response.statusCode == 200) {
    // Convert response body into JSON
    return jsonDecode(response.body);
  } else {
    throw Exception('Failed to load posts');
  }
}

---

4. Use in UI (with FutureBuilder)

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  Future<List<dynamic>> fetchPosts() async {
    final response = await http.get(
      Uri.parse('https://jsonplaceholder.typicode.com/posts'),
    );

    if (response.statusCode == 200) {
      return jsonDecode(response.body);
    } else {
      throw Exception("Failed to load posts");
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text("Fetch Data Example")),
        body: FutureBuilder<List<dynamic>>(
          future: fetchPosts(),
          builder: (context, snapshot) {
            if (snapshot.connectionState == ConnectionState.waiting) {
              return Center(child: CircularProgressIndicator());
            } else if (snapshot.hasError) {
              return Center(child: Text("Error: ${snapshot.error}"));
            } else if (!snapshot.hasData) {
              return Center(child: Text("No data found"));
            } else {
              return ListView.builder(
                itemCount: snapshot.data!.length,
                itemBuilder: (context, index) {
                  final post = snapshot.data![index];
                  return ListTile(
                    title: Text(post['title']),
                    subtitle: Text(post['body']),
                  );
                },
              );
            }
          },
        ),
      ),
    );
  }
}

---

5. Notes

• For POST requests, you can use http.post() with a body and headers.

• For more advanced networking (interceptors, caching, retries), you might use dio package instead of http.

• Always handle errors (try/catch) for network failures.

• If fetching sensitive data, consider using flutter_secure_storage for tokens.

---

👉 Do you want me to also show you how to fetch data with Dio (an alternative with more features), or just stick to the simple http example?

Read More

Explain StatefulWidget vs StatelessWidget in Flutter.

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