ﾄﾞｩﾜｧ! ｾﾝﾅﾅﾋｬｸ!!アプリの作り方

main.dart

import 'package:flutter/material.dart';

import 'package:video_player/video_player.dart';

/*
ﾄﾞｩﾜｧ! ｾﾝﾅﾅﾋｬｸ!!アプリの作り方

▶︎使用技術
・Flutter
iOS/Androidアプリが両方1つのコードで作れるフレームワーク。
Dartというプログラミング言語を使う。

▶︎Flutterアプリ開発に必要なこと
・基本的な環境構築
→公式ドキュメントを見る。YouTubeで非公式の解説動画もある。

・Android Studioのインストール

・iPhone実機にアプリを入れるための用意（今回は省略）

▶開発︎手順
1.動画素材を用意
2.ボタンを表示
3.動画再生ライブラリを導入
4.ボタンの機能
5.カウンター
6.動画を読み込む
7.条件に合わせて動画を再生
 */

// const GOAL_COUNT = 10;
const GOAL_COUNT = 1700;

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'ﾄﾞｩﾜｧ! ｾﾝﾅﾅﾋｬｸ!!'),
    );
  }
}

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

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  late VideoPlayerController _controller;
  late Future<void> _initializeVideoPlayerFuture;
  int _counter = 0;

  @override
  void initState() {
    super.initState();
    _controller = VideoPlayerController.asset("assets/1700.mp4");

    // _controller = VideoPlayerController.network(
    //   // 'https://flutter.github.io/assets-for-api-docs/assets/videos/butterfly2.mp4',
    //   'https://flutter.github.io/assets-for-api-docs/assets/videos/butterfly.mp4',
    // );
    _initializeVideoPlayerFuture = _controller.initialize();
    // _controller.setLooping(true);
    // _controller.play();
  }

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.

      // _counter = _counter + 1;
      _counter++;
    });

    if(_counter == GOAL_COUNT) {
      _controller.play();
    }
  }

  Widget _getMyVideoPlayer() {
    // Use a FutureBuilder to display a loading spinner while waiting for the
// VideoPlayerController to finish initializing.
    return FutureBuilder(
      future: _initializeVideoPlayerFuture,
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.done) {
          // If the VideoPlayerController has finished initialization, use
          // the data it provides to limit the aspect ratio of the video.
          return AspectRatio(
            aspectRatio: _controller.value.aspectRatio,
            // Use the VideoPlayer widget to display the video.
            child: VideoPlayer(_controller),
          );
        } else {
          // If the VideoPlayerController is still initializing, show a
          // loading spinner.
          return const Center(
            child: CircularProgressIndicator(),
          );
        }
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            _getMyVideoPlayer(),
            Text(
              'ﾄﾞｩﾜｧ! ｾﾝﾅﾅﾋｬｸ!!まであと${GOAL_COUNT - _counter}回',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

pubspec.yaml

name: duwa_1700
description: A new Flutter project.

# 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: ">=2.12.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  video_player: ^2.1.6



  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2

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:
    - assets/1700.mp4
  #   - 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