To handle localization and internationalization in a Flutter app, you can use the flutter_localizations package to define and display different languages and locale-specific formatting for dates, times, and numbers. You'll need to create separate string and resource files for each language and use the Localizations widget to display the appropriate resources based on the device's locale.
First, you'll need to create a new Flutter project and add the flutter_localizations package to your pubspec.yaml file:
dependencies:
flutter:
sdk: flutter
flutter_localizations:
Then, you'll need to create separate string files for each language you want to support, such as en.json and de.json, and define your localized strings in those files.
Next, you'll need to define your supported locales and the initial locale for your app in the MaterialApp or CupertinoApp widget:
MaterialApp(
localizationsDelegates: [
GlobalMaterialLocalizations.delegate,
GlobalWidgetsLocalizations.delegate,
],
supportedLocales: [
Locale('en', 'US'),
Locale('de', 'DE'),
],
locale: Locale('en', 'US'),
home: MyHomePage(),
);
Finally, you can use the Localizations widget to display the appropriate localized strings and resources based on the device's locale:
Text(
Localizations.of(context).title,
);
This will display the string with the key "title" from the appropriate localized string file based on the device's locale. You can also use the Localizations.of method to access other localized resources such as dates, times, and numbers.
For example:
Text(
Localizations.of(context).formatDate(DateTime.now()),
);
This will display the current date in the appropriate format for the device's locale. You can also use the Localizations.withLocale method to temporarily override the device's locale for a specific widget or section of your app.
To override the device's locale for a specific widget or section of your app, you can use the Localizations.withLocale method:
Localizations.withLocale(
Locale('fr', 'FR'),
() {
// code here will use the French language and formatting
Text(
Localizations.of(context).formatDate(DateTime.now()),
);
},
);
This will temporarily override the device's locale with the French locale and display the current date in the appropriate French format. This can be useful if you want to display specific resources or formatting for a specific language or locale within your app.
Keep in mind that you'll need to have the appropriate localized string and resource files for the desired locale in order for this to work correctly.