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The Complete 2020 Flutter Development Bootcamp with Dartというコースを学習

The Complete Flutter Development Bootcamp with Dart

〇基本ウィジェット

①MaterialApp

MaterialAppはアプリの開始点。マテリアルコンポーネントを使用してアプリでマテリアルデザインを実行することをFlutterに伝える。

参考：

【Flutter】MaterialAppにて最初に起動させたいページの設定方法について - Qiita

import 'package:flutter/material.dart';

void main() {
 runApp(
   MaterialApp(
     home: Center(
       child: Text('Hello World'),
     ),
   ),
 );
}

②Scaffold

ScaffoldはMaterialAppの下で使用し、AppBar、BottomNavigationBar、Drawer、FloatingActionButtonなど、多くの基本的な機能を提供する。

dart - FlutterのScaffoldとMaterialAppの違いは何ですか？

import 'package:flutter/material.dart';

void main() {
 runApp(
   MaterialApp(
     home: Scaffold(
         appBar:AppBar(
           title:Text('I Am Rich'),
         ),
     ),
   )
 );
}

③Image

import 'package:flutter/material.dart';

void main() {
 runApp(
   MaterialApp(
     home: Scaffold(
       backgroundColor:Colors.teal[50] ,
         appBar:AppBar(
           title:Text('I Am Rich'),
           backgroundColor:Colors.teal[700],
                     ),
         body:Image(
           image:NetworkImage('https://www.min-inuzukan.com/images/detailMain_chihuahua.png?20200203_l'),
         )
     ),
   )
 );
}

③アイコンの編集

〇yamlの編集

プログラマーのための YAML 入門 (初級編)

name: flutter_app_test
description: A new Flutter application.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
 sdk: ">=2.7.0 <3.0.0"

dependencies:
 flutter:
   sdk: flutter


 # The following adds the Cupertino Icons font to your application.
 # Use with the CupertinoIcons class for iOS style icons.
 cupertino_icons: ^1.0.0

dev_dependencies:
 flutter_test:
   sdk: flutter

# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

 # The following line ensures that the Material Icons font is
 # included with your application, so that you can use the icons in
 # the material Icons class.
 uses-material-design: true

 # To add assets to your application, add an assets section, like this:
 assets:
    - images/enpitu.png
 #   - images/a_dot_burr.jpeg
 #   - images/a_dot_ham.jpeg

 # An image asset can refer to one or more resolution-specific "variants", see
 # https://flutter.dev/assets-and-images/#resolution-aware.

 # For details regarding adding assets from package dependencies, see
 # https://flutter.dev/assets-and-images/#from-packages

 # To add custom fonts to your application, add a fonts section here,
 # in this "flutter" section. Each entry in this list should have a
 # "family" key with the font family name, and a "fonts" key with a
 # list giving the asset and other descriptors for the font. For
 # example:
 # fonts:
 #   - family: Schyler
 #     fonts:
 #       - asset: fonts/Schyler-Regular.ttf
 #       - asset: fonts/Schyler-Italic.ttf
 #         style: italic
 #   - family: Trajan Pro
 #     fonts:
 #       - asset: fonts/TrajanPro.ttf
 #       - asset: fonts/TrajanPro_Bold.ttf
 #         weight: 700
 #
 # For details regarding fonts from package dependencies,
 # see https://flutter.dev/custom-fonts/#from-packages

〇アイコン画像ダウンロード

App Icon Generator

↑を下の□に入れる

〇アイコンを表示

main.dart

import 'package:flutter/material.dart';

void main() {
 runApp(
   MaterialApp(
     home: Scaffold(
       backgroundColor:Colors.teal[50] ,
         appBar:AppBar(
           title:Text('I Am Rich'),
           backgroundColor:Colors.teal[700],
                     ),
         body:Center(
           child: Image(
             image: AssetImage('images/enpitu.png'),
         )
     ),
   )
 ),
 );
}

〇アイコンの確認