실생활 앱 (날씨 앱)

import 'package:flutter/material.dart';

class Weather {
  const Weather({
    required this.place,
    required this.temp,
    required this.description,
    required this.country,
  });
  final String place;
  final int temp;
  final String description;
  final String country;

  factory Weather.fromJson(Map<String, dynamic> json) {
    return Weather(
      place: json['place'] as String,
      temp: json['temp'] as int,
      description: json['description'] as String,
      country: json['country'] as String,
    );
  }
}

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

  @override
  State<WeatherApiApp> createState() => _WeatherApiAppState();
}

class _WeatherApiAppState extends State<WeatherApiApp> {
  Weather? weather;
  bool loading = false;
  String error = '';

  Future<void> fetchWeather() async {
    setState(() {
      loading = true;
      error = '';
    });
    // 실제 앱에서는 geolocator로 현재 위치를 얻고,
    // 해당 좌표를 날씨 API에 전달합니다.
    await Future.delayed(const Duration(seconds: 1));
    final json = {
      'place': '현재 위치',
      'temp': 24,
      'description': '구름 조금',
      'country': '대한민국',
    };
    setState(() {
      weather = Weather.fromJson(json);
      loading = false;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        ElevatedButton(onPressed: fetchWeather, child: const Text('날씨 조회')),
        if (loading) const CircularProgressIndicator(),
        if (error.isNotEmpty) Text(error),
        if (weather != null)
          Card(
            child: Column(
              children: [
                Text(weather!.place),
                Text('\${weather!.temp}°C'),
                Text(weather!.description),
                Text(weather!.country),
                const Icon(Icons.public),
              ],
            ),
          ),
      ],
    );
  }
}

Card(
  child: Padding(
    padding: const EdgeInsets.all(20),
    child: Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          '현재 위치 날씨',
          style: TextStyle(fontSize: 22, fontWeight: FontWeight.w900),
        ),
        const SizedBox(height: 16),
        FilledButton(onPressed: fetchWeather, child: const Text('날씨 조회')),
      const SizedBox(height: 12),
      Card(
        child: ListTile(
          title: Text(weather.place),
          subtitle: Text(weather.description),
          trailing: Text('${weather.temp}°C'),
        ),
      ),
      const Icon(Icons.location_pin)
      ],
    ),
  ),
)