import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: MyWidget(),
    ),
  );
}

class MyWidget extends StatefulWidget {
  const MyWidget({Key? key}) : super(key: key);

  @override
  State<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool selected = false;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: ChoiceChip(
          label: const Text('タグです'),
          selected: selected,
          onSelected: (value) => setState(() => selected = value),
          selectedColor: Colors.orange,
        ),
      ),
    );
  }
}