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strings and other values for the Material Components
library. GlobalWidgetsLocalizations.delegate
defines the default text direction,
either left-to-right or right-to-left, for the widgets library.More information about these app properties, the types they
depend on, and how internationalized Flutter apps are typically
structured, is covered in this page.<topic_end>
<topic_start>
Overriding the locale
Localizations.override is a factory constructor
for the Localizations widget that allows for
(the typically rare) situation where a section of your application
needs to be localized to a different locale than the locale
configured for your device.To observe this behavior, add a call to Localizations.override
and a simple CalendarDatePicker:
<code_start>Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
// Add the following code
Localizations.override(
context: context,
locale: const Locale('es'),
// Using a Builder to get the correct BuildContext.
// Alternatively, you can create a new widget and Localizations.override
// will pass the updated BuildContext to the new widget.
child: Builder(
builder: (context) {
// A toy example for an internationalized Material widget.
return CalendarDatePicker(
initialDate: DateTime.now(),
firstDate: DateTime(1900),
lastDate: DateTime(2100),
onDateChanged: (value) {},
);
},
),
),
],
),
),
);
}<code_end>
Hot reload the app and the CalendarDatePicker
widget should re-render in Spanish.<topic_end>
<topic_start>
Adding your own localized messages
After adding the flutter_localizations package,
you can configure localization.
To add localized text to your application,
complete the following instructions:Add the intl package as a dependency, pulling
in the version pinned by flutter_localizations:Open the pubspec.yaml file and enable the generate flag.
This flag is found in the flutter section in the pubspec file.
<code_start># The following section is specific to Flutter.
flutter:
generate: true # Add this line<code_end>
Add a new yaml file to the root directory of the Flutter project.
Name this file l10n.yaml and include following content:
<code_start>arb-dir: lib/l10n
template-arb-file: app_en.arb
output-localization-file: app_localizations.dart<code_end>
This file configures the localization tool.
In this example, you’ve done the following:In ${FLUTTER_PROJECT}/lib/l10n,
add the app_en.arb template file. For example:
<code_start>{
"helloWorld": "Hello World!",
"@helloWorld": {
"description": "The conventional newborn programmer greeting"
}
}<code_end>
Add another bundle file called app_es.arb in the same directory.
In this file, add the Spanish translation of the same message.
<code_start>{
"helloWorld": "¡Hola Mundo!"
}<code_end>
Now, run flutter pub get or flutter run and codegen takes place automatically.
You should find generated files in
${FLUTTER_PROJECT}/.dart_tool/flutter_gen/gen_l10n.
Alternatively, you can also run flutter gen-l10n to
generate the same files without running the app.Add the import statement on app_localizations.dart and
AppLocalizations.delegate
in your call to the constructor for MaterialApp:
<code_start>import 'package:flutter_gen/gen_l10n/app_localizations.dart';<code_end>
<code_start>return const MaterialApp(
title: 'Localizations Sample App',
localizationsDelegates: [
AppLocalizations.delegate, // Add this line
GlobalMaterialLocalizations.delegate,
GlobalWidgetsLocalizations.delegate,
GlobalCupertinoLocalizations.delegate,
],
supportedLocales: [
Locale('en'), // English
Locale('es'), // Spanish
],
home: MyHomePage(),