Membuat autocomplete Dart Flutter

List<String> suggestons = ["USA", "UK", "Uganda", "Uruguay", "United Arab Emirates"];

 Expanded(child: Autocomplete( optionsBuilder: (TextEditingValue textEditingValue){
    if (textEditingValue.text == ''){
      return const Iterable<String>.empty();
    } else {
      List<String> matches = <String>[];
      matches.addAll(suggestons);
      matches.retainWhere((s) {
        return s.toLowerCase().contains(textEditingValue.text.toLowerCase());
      });
      return matches;
    }
  },
  onSelected: (String selected){
    print('Selection $selected');
  },
)

Hasilnya