Localison

Provides localization support to a Flutter app using JSON files without too many bells and whistles. It relies on simple JSON files to represent the different localizations for texts written in a base language, and includes support for plural (ISO standard), plural support using quantities (non-ISO standard) and gender support.

The default locale in Localison is English (Localisoin.defaultLocale), and the initial base locale points to it. You can change it easily if you need to by calling Localison.baseLocale(...); in your main() function.

The plugin provides all that a MaterialApp needs in order to properly load localizations from JSON files.

Getting Started

A multi-lingual MaterialApp has at least the following structure:

const Iterable<Locale> supportedLocales = /* list of supported locales */

Locale currentLocale = /* the current locale for a user/device */

MaterialApp(
  localizationsDelegates: [
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
  ],
  supportedLocales: supportedLocales,
  locale: currentLocale,
  ...
);

To add Localison support, create your simple JSON files (or download them from your online localization service's website) in res/l10n/ directory.

The directory can be changed by calling Localison.baseDirectory(...) in your main() function.

Note: the JSON file associated with the base locale must be called base.json.

The JSON file's structure is easy:

{
  "btn_send": "Send",
  "btn_join": "Join",
  "btn_Cancel": "Cancel",

  "items_zero": "You have no items.",
  "items_one": "You have one item.",
  "items_two": "You have two items.",
  "items_few": "You have few items.",
  "items_many": "You have many items.",
  "items_other": "You have %d items.",

  "quantified_items_zero": "You have no items.",
  "quantified_items_one": "You have one item.",
  "quantified_items_two": "You have two items.",
  "quantified_items_few": "You have %d items.",
  "quantified_items_many": "You have %d items.",
  "quantified_items_other": "You have %d items.",

  "close_male": "Your male friend is here.",
  "close_female": "Your female friend is here.",
  "close_trans": "Your transgender friend is here.",
  "close_other": "Your friend is here."
}

Finally, you can alter the MaterialApp to look like this:

const Iterable<Locale> supportedLocales = /* list of supported locales */

Locale currentLocale = /* the current locale for a user/device */

final localison = Localison(supportedLocales); // Add this

MaterialApp(
  localizationsDelegates: [
    localison, // Add this
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
  ],
  supportedLocales: localison.locales, // Add this
  locale: currentLocale,
  ...
);

Installation

Add the following to your pubspec.yaml file:

dependencies:
  localison: any

Update Flutter's dependencies: flutter pub get

Finally, load it in your Dart code: import 'package:localison/localison.dart';