flutter_translate

The internationalization (i18n) library for Flutter.

It lets you define translations for your content in different languages and switch between them easily.

flutter_translate

Installation

Add this to your package's pubspec.yaml file:

dependencies:
  flutter_translate: ^1.2.5

Install packages from the command line (or from your editor):

flutter pub get

Configuration

Import flutter_translate:

import 'package:flutter_translate/flutter_translate.dart';

Place the json localization files in a folder of your choice within the project.

By default flutter_translate will search for localization files in the assets/i18n directory in your project's root.

Declare your assets localization directory in pubspec.yaml

flutter:
  assets:
    - assets/i18n

In the main function create the localization delegate and start the app, wrapping it with LocalizedApp

void main() async
{
  var delegate = await LocalizationDelegate.create(
        fallbackLanguage: 'en',
        supportedLanguages: ['en', 'es_ES', 'fa']);

  runApp(LocalizedApp(delegate, MyApp()));
}

If the assets directory for the localization files is different than the default one (assets/i18n), you need to specify it:

void main() async
{
  var delegate = await LocalizationDelegate.create(
        fallbackLanguage: 'en',
        supportedLanguages: ['en', 'es_ES', 'fa'],
        basePath: 'assets/i18n/');

  runApp(LocalizedApp(delegate, MyApp()));
}

Example MyApp:

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {

    var localizationDelegate = LocalizedApp.of(context).delegate;

    return LocalizationProvider(
      state: LocalizationProvider.of(context).state,
      child: MaterialApp(
          title: 'Flutter Translate Demo',
          localizationsDelegates: [
            GlobalMaterialLocalizations.delegate,
            GlobalWidgetsLocalizations.delegate,
            localizationDelegate
          ],
          supportedLocales: localizationDelegate.configuration.supportedLocales,
          locale: localizationDelegate.currentLocale,
          theme: ThemeData(primarySwatch: Colors.blue),
          home: MyHomePage(),
          ),
    );
  }
}

Usage

Translate a string:

translate('your.localization.key');

Translate with arguments;

translate('your.localization.key', args: {'argName1': argValue1, 'argName2': argValue2});

Translate with pluralization:

translatePlural('plural.demo', yourNumericValue);

JSON:

"plural": {
    "demo": {
        "0": "Please start pushing the 'plus' button.",
        "1": "You have pushed the button one time.",
        "else": "You have pushed the button {{value}} times."
    }
}

Change the language:

@override
Widget build(BuildContext context) {
...
  ...
    changeLanguage(context, 'en');
  ...
...
}

You can view the full example here:

https://github.com/bratan/flutter_translate/blob/master/example/lib/main.dart

GitHub

https://github.com/bratan/flutter_translate