【Flutter】Card（カード）使い方を3分で解説!（コピペOK）

import 'package:flutter/material.dart';

void main() {
  runApp(const CardDemoApp());
}

class CardDemoApp extends StatelessWidget {
  const CardDemoApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
          colorSchemeSeed: const Color(0xff1472b6), useMaterial3: true),
      home: Scaffold(
        appBar: AppBar(title: const Text('カードデモ')),
        body: Column(
          children: const <Widget>[
            Spacer(),
            ElevatedCardExample(),
            FilledCardExample(),
            OutlinedCardExample(),
            Spacer(),
          ],
        ),
      ),
    );
  }
}

class ElevatedCardExample extends StatelessWidget {
  const ElevatedCardExample({super.key});

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.center,
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: const <Widget>[
          Card(
            color: Color(0xffcce3f3),
            elevation: 10,
            shadowColor: Colors.black,
            child: SizedBox(
              width: 275,
              height: 80,
              child: Center(child: Text('Card1')),
            ),
          ),
          Card(
            color: Color(0xffcce3f3),
            elevation: 10,
            shadowColor: Colors.red,
            child: SizedBox(
              width: 275,
              height: 80,
              child: Center(child: Text('Card2')),
            ),
          ),
          Card(
            color: Color(0xffcce3f3),
            elevation: 10,
            shadowColor: Colors.yellow,
            child: SizedBox(
              width: 275,
              height: 80,
              child: Center(child: Text('Card3')),
            ),
          ),
        ],
      ),
    );
  }
}

class FilledCardExample extends StatelessWidget {
  const FilledCardExample({super.key});

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Card(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            const ListTile(
              leading: Icon(Icons.add_card,color: Colors.blue,),
              title: Text('焼き芋のITブログ'),
              subtitle: Text('文系エンジニア向けにIT情報を発信してます'),
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.end,
              children: <Widget>[
                ElevatedButton(
                  child: const Text('お気に入りに追加'),
                  style: TextButton.styleFrom(
                    foregroundColor: Colors.white, // foreground
                    backgroundColor: Colors.blue,
                  ),
                  onPressed: () {},
                ),
                const SizedBox(width: 4),
                TextButton(
                  child: const Text('削除しない'),
                  onPressed: () {},
                ),
                const SizedBox(width: 8),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

class OutlinedCardExample extends StatelessWidget {
  const OutlinedCardExample({super.key});

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Card(
        elevation: 0,
        shape: RoundedRectangleBorder(
              side: BorderSide(
            color: Theme.of(context).colorScheme.outline,
          ),
          borderRadius: const BorderRadius.all(Radius.circular(20)),
        ),
        child: const SizedBox(
          width: 900,
          height: 40,
          child: Center(child: Text('Card4')),
        ),
      ),
    );
  }
}