import 'package:flutter/material.dart';

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

class MyWidget extends StatelessWidget {
  final List<String> matchItems = ['原神', 'ドッキリ神回避', '原神音楽', '原神攻略'];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Autocomplete<String>(
          optionsBuilder: (textEditingValue) {
            if (textEditingValue.text.isEmpty) {
              return Iterable.empty();
            }
            return matchItems.where(
              (element) => element.contains(textEditingValue.text),
            );
          },
          onSelected: (value) => print(value),
        ),
      ),
    );
  }
}