API Calling with HTTP Library (Fourth API)

 import "dart:convert";

import "package:api_integration_http/Second_Api_Integration/Second_Model_Class.dart";
import "package:flutter/material.dart";
import "package:http/http.dart" as http;

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "Second Api Calling",
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        appBarTheme: const AppBarTheme(
          backgroundColor: Colors.grey,
          centerTitle: true,
        ),
      ),
      home: const SecondApi(),
    );
  }
}

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

  @override
  State<SecondApi> createState() {
    return SecondApiState();
  }
}

class SecondApiState extends State<SecondApi> {
  late Future<List<SecondModel>> futureSecondModel;

  Future<List<SecondModel>> fetchSecondModel() async {
    final response = await http.get(
      Uri.parse("https://jsonplaceholder.typicode.com/posts"),
    );

    if (response.statusCode == 200) {
      Iterable jsonResponse = json.decode(response.body);

      List<SecondModel> dataInputs = jsonResponse.map(
            (model) {
          return SecondModel.fromJson(model);
        },
      ).toList();
      return dataInputs;
    } else {
      throw Exception("Failed to load data!");
    }
  }

  @override
  void initState() {
    super.initState();
    futureSecondModel = fetchSecondModel();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text(
          "Second Api Calling",
          style: TextStyle(fontWeight: FontWeight.bold),
        ),
      ),
      body: Center(
        child: FutureBuilder<List<SecondModel>>(
          future: futureSecondModel,
          builder: (context, snapshot) {
            if (snapshot.hasData) {
              List<SecondModel>? data = snapshot.data;
              return ListView.builder(
                itemCount: data!.length,
                itemBuilder: (context, index) {
                  return Card(
                    child: ListTile(
                      title: Text(
                        data[index].title,
                        style: const TextStyle(fontWeight: FontWeight.bold),
                      ),
                      subtitle: Text(data[index].body),
                      trailing: Text(
                        data[index].id.toString(),
                        style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0),
                      ),
                    ),
                  );
                },
              );
            } else if (snapshot.hasError) {
              return Text("${snapshot.error}");
            }
            return const CircularProgressIndicator();
          },
        ),
      ),
    );
  }
}

class SecondModel {
  final int userId;
  final int id;
  final String title;
  final String body;

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

  factory SecondModel.fromJson(Map<String, dynamic> json) {
    return switch (json) {
      {
        "userId": int userId,
        "id": int id,
        "title": String title,
        "body": String body,
      } =>
        SecondModel(
          userId: userId,
          id: id,
          title: title,
          body: body,
        ),
      _ => throw const FormatException("Failed to load SecondModel"),
    };
  }
}