How do you internationalize and localize a Flutter app?
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Internationalizing and localizing a Flutter app involves adapting it to support multiple languages and regional settings. Start by adding the flutter_localizations package in pubspec.yaml, and ensure it's included in MaterialApp or CupertinoApp via the localizationsDelegates and supportedLocales properties.
Use the intl package for managing localized messages. Create an arb (Application Resource Bundle) file for each language (e.g., app_en.arb, app_es.arb) containing key-value pairs of translatable strings. Use the intl_translation or flutter_intl tools to generate Dart localization files (.dart) from these ARB files.
In your widgets, replace hardcoded strings with localized ones using AppLocalizations.of(context).yourStringKey. You can hot reload to preview changes and switch between locales for testing.
To detect or change the language, use Locale settings—Flutter automatically detects the device language, or you can override it manually via the locale property of MaterialApp.
For date, number, and currency formatting, use intl functions like DateFormat and NumberFormat, which adapt based on locale.
Test localization thoroughly on devices/emulators with different system languages. Also, ensure text expansion, layout mirroring for RTL languages, and accessibility compliance.
Overall, localization in Flutter is streamlined with the intl ecosystem and requires a structured setup for translation files and runtime handling of locales.
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