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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(),
);
<code_end>
the AppLocalizations class also provides auto-generated
localizationsDelegates and supportedLocales lists.
you can use these instead of providing them manually.
<code_start>
const MaterialApp(
title: 'localizations sample app',
localizationsDelegates: AppLocalizations.localizationsDelegates,
supportedLocales: AppLocalizations.supportedLocales,
);
<code_end>
once the material app has started,
you can use AppLocalizations anywhere in your app:
<code_start>
appBar: AppBar(
// the [appbar] title text should update its message
// according to the system locale of the target platform.
// switching between english and spanish locales should
// cause this text to update.
title: Text(AppLocalizations.of(context)!.helloWorld),
),
<code_end>
info note
the material app has to actually be started to initialize
AppLocalizations. if the app hasn’t yet started,
AppLocalizations.of(context)!.helloWorld causes a
null exception.
this code generates a text widget that displays “hello world!”
if the target device’s locale is set to english,
and “¡hola mundo!” if the target device’s locale is set
to spanish. in the arb files,
the key of each entry is used as the method name of the getter,
while the value of that entry contains the localized message.
the gen_l10n_example uses this tool.
to localize your device app description,
pass the localized string to
MaterialApp.onGenerateTitle:
<code_start>
return MaterialApp(
onGenerateTitle: (context) => DemoLocalizations.of(context).title,
<code_end>
<topic_end>
<topic_start>
placeholders, plurals, and selects
lightbulb tip
when using VS code, add the arb-editor extension.
this extension adds syntax highlighting, snippets,
diagnostics, and quick fixes to help edit .arb template files.
you can also include application values in a message with
special syntax that uses a placeholder to generate a method
instead of a getter.
a placeholder, which must be a valid dart identifier name,
becomes a positional parameter in the generated method in the
AppLocalizations code. define a placeholder name by wrapping
it in curly braces as follows:
define each placeholder in the placeholders object
in the app’s .arb file. for example,
to define a hello message with a userName parameter,
add the following to lib/l10n/app_en.arb:
<code_start>
"hello": "hello {username}",
"@hello": {
"description": "a message with a single parameter",
"placeholders": {
"username": {
"type": "string",
"example": "bob"
}
}
}
<code_end>
this code snippet adds a hello method call to
the AppLocalizations.of(context) object,
and the method accepts a parameter of type string;
the hello method returns a string.
regenerate the AppLocalizations file.
replace the code passed into builder with the following:
<code_start>
// examples of internationalized strings.
return column(