Michelle's 앱개발

import 'package:flutter/material.dart'; void main() => runApp(WidgetDemo()); class WidgetDemo extends StatefulWidget { @override _WidgetDemoState createState() => _WidgetDemoState(); } class _WidgetDemoState extends State { @override Widget build(BuildContext context) { return MaterialApp( home: ShowDatePicker(), ); } } class ShowDatePicker extends StatefulWidget { const ShowDatePicker({Key key}..

import 'package:flutter/material.dart'; enum RGB { red, green, blue } void main() => runApp(WidgetDemo()); class WidgetDemo extends StatefulWidget { @override _WidgetDemoState createState() => _WidgetDemoState(); } class _WidgetDemoState extends State { RGB _selection = RGB.red; @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar( title: Text('Poopup..

DateTime.now().millisecondhttps://pub.dev/documentation/intl/latest/intl/DateFormat-class.html DateFormat class - intl library - Dart API DateFormat is for formatting and parsing dates in a locale-sensitive manner. It allows the user to choose from a set of standard date time formats as well as specify a customized pattern under certain locales. Date elements that vary across locales include pub..

https://api.flutter.dev/flutter/material/DropdownButton-class.html DropdownButton class - material library - Dart API A material design button for selecting from a list of items. A dropdown button lets the user select from a number of items. The button shows the currently selected item as well as an arrow that opens a menu for selecting another item. The type T is the typ api.flutter.dev 2. Drop..

Positioned 위젯! https://youtu.be/EgtPleVwxBQ https://api.flutter.dev/flutter/widgets/Positioned-class.html Positioned class - widgets library - Dart API A widget that controls where a child of a Stack is positioned. A Positioned widget must be a descendant of a Stack, and the path from the Positioned widget to its enclosing Stack must contain only StatelessWidgets or StatefulWidgets (not other ki..

ListView( children: [ Text( 'Explore Flights by Destination', style: TextStyle(color: Colors.black, fontSize: 15), ), ListTile( leading: Image(image: AssetImage('images/bg1.jpeg'), width: 90,), title: Text('Khumbu Valley, Nepal'), subtitle: Text('Nonstop - 5h 16m+'), minLeadingWidth: 100, ), Divider(thickness: 2,), ) Error 남.. ListView 에 scrollDirection과 shringWray넣어주면 에러 해결! scrollDirection: Ax..

조건을 필터링할 때 사용하는 함수. 예를 들어 짝수만 출력하고 싶을 때. items.where((e) => e % 2 == 0).forEach(print); 함수형 프로그래밍을 지원하는 함수들은 결과를 반복 가능한 타입으로 반환하며 메서드 체인(.) 으로 연결하여 사용할 수 있다.

* 사용 static void SingleToneInstanceTest() { // SingletoneInstance inst = new SingletoneInstance() ; // ERROR as constructor is private SingletoneInstance inst = SingletoneInstance.newInstance() ; } class SingletoneInstance { // 단 하나의 객체로만 운영할 때 private static SingletoneInstance single = null ; private SingletoneInstance() { // make can't instance with new } static SingletoneInstance newInstance(..

공부~ 공부~ 잘 이해가 안되는 부분 있음. 디자인패턴 책 찾아보기.. * 중첩 클래스 static class Builder를 Person의 중첩클래스로 사용 class Person{ /* KHR comment . static 중첩 class 를 이용하여 객체생성 편의화 패턴 . 일반적으로 setter method 혹은 생성자 패턴을 사용하지만 . 간편화 와 가독성을 가져간다 */ private String name ; private String address ; Person (Builder builder) { this.name = builder.name ; this.address = builder.address ; } static class Builder{ private String name ; pri..

Eclipse M1용 다운받기. www.eclipse.org/downloads/packages/release/2021-03/m1 2021-03 M1 | Eclipse Packages 438 MB 85 DOWNLOADS The Modeling package provides tools and runtimes for building model-based applications. You can use it to graphically design domain models, to leverage those models at design time by creating and editing dynamic instances, to collaborat www.eclipse.org M1용 jdk 다운받고 설치, 설정 hee..