通过创建自己的DefaultMaterialLocalizations类并将其传递到MaterialApp小部件中，可以解决此问题：
void main() => runApp(SearchApp());
class SearchApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
localizationsDelegates: [
CustomLocalizationDelegate(),
],
home: Scaffold(
appBar: AppBar(
title: Text('Search demo'),
),
body: Center(
child: Builder(
builder: (context) => MaterialButton(
child: Text('Search'),
onPressed: () => showSearch(
context: context,
delegate: DummyDelegate(),
),
),
),
),
),
);
}
}
class DummyDelegate extends SearchDelegate<String> {
@override
List<Widget> buildActions(BuildContext context) => [];
@override
Widget buildLeading(BuildContext context) => IconButton(
icon: Icon(Icons.close),
onPressed: () => Navigator.of(context).pop(),
);
@override
Widget buildresults(BuildContext context) => Text('Result');
@override
Widget buildSuggestions(BuildContext context) => Text('Suggestion');
}
class CustomLocalizationDelegate extends LocalizationsDelegate<MaterialLocalizations> {
const CustomLocalizationDelegate();
@override
bool isSupported(Locale locale) => locale.languageCode == 'en';
@override
Future<MaterialLocalizations> load(Locale locale) => SynchronousFuture<MaterialLocalizations>(const CustomLocalization());
@override
bool shouldReload(CustomLocalizationDelegate old) => false;
@override
String toString() => 'CustomLocalization.delegate(en_US)';
}
class CustomLocalization extends DefaultMaterialLocalizations {
const CustomLocalization();
@override
String get searchFieldLabel => "My hint text";
}
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