// main.dart
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    /// MaterialApp is the base Widget for your Flutter Application
    /// Gives us access to routing, context, and meta info functionality.
    return MaterialApp(
      title: 'We Rate Dogs',
      // Make all our text default to white
      // and backgrounds default to dark
      theme: ThemeData(brightness: Brightness.dark),
      home: MyHomePage(title: 'We Rate Dogs'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
    @override
    Widget build(BuildContext context) {
        /// Scaffold is the base for a page.
        /// It gives an AppBar for the top,
        /// Space for the main body, bottom navigation, and more.
        return Scaffold(
            /// App bar has a ton of functionality, but for now lets
            /// just give it a color and a title.
            appBar: AppBar(
                /// Access this widgets properties with 'widget'
                title: Text(widget.title),
                backgroundColor: Colors.black87,
            ),
            /// Container is a convenience widget that lets us style it's
            /// children. It doesn't take up any space itself, so it
            /// can be used as a placeholder in your code.
            body: Container(),
        );
    }
}

- lib
  -dog_model.dart
  -main.dart

class Dog {
  final String name;
  final String location;
  final String description;
  String imageUrl;

  // 모든 강아지는 10점부터 출발한다. 왜냐면 다 좋은 강아지니깐~
  int rating = 10;

  Dog(this.name, this.location, this.description);
}

// dog_model.dart

Future getImageUrl() async {
  // Null check so our app isn't doing extra work.
  // If there's already an image, we don't need to get one.
  if (imageUrl != null) {
    return;
  }

  // This is how http calls are done in flutter:
  HttpClient http = HttpClient();
  try {
    // Use darts Uri builder
    var uri = Uri.http('dog.ceo', '/api/breeds/image/random');
    var request = await http.getUrl(uri);
    var response = await request.close();
    var responseBody = await response.transform(utf8.decoder).join();
    // The dog.ceo API returns a JSON object with a property
    // called 'message', which actually is the URL.
    imageUrl = json.decode(responseBody)['message'];
  } catch (exception) {
    print(exception);
  }
}

import 'dart:convert'; // json string 변환을 위함.
import 'dart:io'; // HttpClient를 위함.

// main.dart

import 'package:flutter/material.dart';

import 'dog_model.dart';

// main.dart in the State class

class _MyHomePageState extends State<MyHomePage> {
  List<Dog> initialDoggos = []
    ..add(Dog('Ruby', 'Portland, OR, USA',
        'Ruby is a very good girl. Yes: Fetch, loungin\'. No: Dogs who get on furniture.'))
    ..add(Dog('Rex', 'Seattle, WA, USA', 'Best in Show 1999'))
    ..add(Dog('Rod Stewart', 'Prague, CZ',
        'Star good boy on international snooze team.'))
    ..add(Dog('Herbert', 'Dallas, TX, USA', 'A Very Good Boy'))
    ..add(Dog('Buddy', 'North Pole, Earth', 'Self proclaimed human lover.'));
}

flutter create basic_flutter_app
cd basic_flutter_app
flutter run

git clone https://github.com/ericwindmill/flutter_by_example_apps.git
cd flutter_by_example_apps/blank_flutter_app
flutter packages get
flutter run