Maybe a good idea to implement "search" for a package that's called SEARCHABLE_dropdown about searchable_dropdown HOT 2 CLOSED

  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final List<String> list = ['1112', '11122', '11123','11133','11143'];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: DropdownSearch<String>(
          onChanged: (value) {
            print(value);
          },
          items: list,
          compareFn: (i, s) => i == s,
          dropdownButtonProps: const DropdownButtonProps(
            padding: EdgeInsets.zero,
          ),
          dropdownDecoratorProps: const DropDownDecoratorProps(
            textAlign: TextAlign.left,
            textAlignVertical: TextAlignVertical.center,
            dropdownSearchDecoration: InputDecoration(
              hintText: 'Comune',
              contentPadding: EdgeInsets.zero,
              border: InputBorder.none,
            ),
          ),
          popupProps: PopupPropsMultiSelection.modalBottomSheet(
            showSelectedItems: true,
            showSearchBox: true,
            itemBuilder: (
              BuildContext context,
              String? value,
              bool isSelected,
            ) =>
                Text(value!),
          ),
        ),
      ),
    );
  }
}