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[Flutter] 2. Hello, Flutter
[Flutter] 2. Hello, Flutter
간단한 Flutter 어플리케이션을 만들어봅니다.
| no | 이전 시리즈 |
|---|---|
| 1 | Flutter 개발 환경 준비 |
Start a new Flutter project 가 생긴 것을 확인할 수 있습니다.
그 이후에는 안드로이드 프로젝트를 만들 때와 비슷한 과정을 거치게 됩니다.
New Flutter Application 창에서는 프로젝트 이름을 수정합니다. 만약 Flutter SDK 경로가 지정되어있지 않다면 설치한 경로를 넣어줍니다. 그 다음 창에서 company domain 도 지정해줍니다.
이렇게 하면 새로운 프로젝트가 만들어집니다.
Hello, Flutter 1
main 함수를 아래 코드로 수정합니다.void main() {
runApp(
Center(
child: Text(
'Hello, world!',
textDirection: TextDirection.ltr,
),
),
);
}
Flutter에서는 위젯을 광범위한 개념으로 사용합니다. Center 위젯은 내부에 있는 자식 위젯들을 가운데로 정렬하는 역할을 하는 위젯입니다. 이렇게 정렬 같은 추상적인 개념들도 위젯으로 정의합니다.
여기서는 Center() 위젯 안에 있는 child 프로퍼티로 Text 위젯을 사용합니다.
flutter API 문서에서 위젯 종류와 내부 프로퍼티들을 확인하세요. https://api.flutter.dev/
Hello, Flutter 2
한 단계 복잡하게 해 봅시다. MaterialApp 위젯을 사용하면 머터리얼 디자인이 적용된 앱을 만들 수 있습니다.
import 'package:flutter/material.dart';
void main() {
runApp(
MaterialApp(
home: Center(
child: Text(
'Hello, world!',
textDirection: TextDirection.ltr,
),
),
),
);
}+ Scaffold
Scaffold 클래스는 기본적인 Material 디자인 구성요소들 (앱 바, 네비게이션 바, 스낵 바, drawer, fab 등등) 을 구현하는 클래스 입니다.
import 'package:flutter/material.dart';
void main() {
runApp(
MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('scaffold sample'),
),
body: Center(
child: Text('Hello, world!'),
),
),
),
);
}이미지 추가
앱에 이미지를 넣어봅시다.https://flutter.dev/docs/development/ui/assets-and-images
NetworkImage
역시 웹 언어라 그런지 네트워크에서 이미지를 불러오는 게 더 간단해 보입니다.import 'package:flutter/material.dart';
void main() {
runApp(
MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('scaffold sample'),
backgroundColor: Colors.amberAccent[700],
),
body: Center(
child: Image(
image: NetworkImage(
'https:https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi71mlHqkI-O6Xb71M7wmz4isZ6a_C9TCE0kTns6zLdhMnoQZjDQY3fL9ofow9obUe3qtpgnBjZfcjncT6ZIKzRCmdlYbMHEMs6CXjYS4k9xA8bYdDa-XqNGaYqM8ArfRTmKu4wddS0ZCPL/s1600/logo-crop180.png',
),
),
),
),
),
);
}AssetImage
앱 내부에 저장된 Asset 이미지를 가져오는 건 조금 복잡합니다.
- images 디렉토리를 추가합니다.
- pubspec.yaml 파일로 들어가 flutter: asset: 안에서 asset 경로를 등록합니다. (여기서는 images/)
- dart 파일을 수정합니다.
import 'package:flutter/material.dart';
void main() {
runApp(
MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('scaffold sample'),
backgroundColor: Colors.amberAccent[700],
),
body: Center(
child: Image(
image: AssetImage('images/AboutMe1.png'),
),
),
),
),
);
}App Icon 추가
Android 와 iOS에 대해서 개별적으로 만들어줘야 합니다.Android의 경우 : res 폴더 아래에 있는 mipmap 폴더들에 전부 아이콘들 넣어줌 iOS의 경우 : Assets.xcassets 폴더
https://appicon.co/
.
piano (press key Q)
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