flutter_i18n 0.3.0

i18n made easy for Flutter. With flutter_i18n you can make your app international, using just a simple .json file!

flutter_i18n

I18n made easy, for Flutter!

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Why you should use flutter_i18n?

The main goal of flutter_i18n is to simplify the i18n process in Flutter. I would like to recreate the same experience that you have with the Angular i18n: simple json files, one for each language that you want to support.

Configuration

To use this library, you must create in your project's root the following subfolders:

/assets/flutter_i18n

and put inside them the json related to the translation, using the following configuration:

• If you want to specify the country code

  /assets/flutter_i18n/{languageCode}_{countryCode}.json

• otherwise

  /assets/flutter_i18n/{languageCode}.json

Of course, you must declare the subtree in your pubspec.yaml as assets:

flutter:
  assets:
    - assets/flutter_i18n/

The next step consist in the configuration of the localizationsDelegates; to use flutter_i18n, you should configure as follows:

localizationsDelegates: [
        FlutterI18nDelegate(useCountryCode, [fallbackFile]),
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate
],

The useCountryCode parameter depends on the json configuration:

• if you used the pattern {languageCode}_{countryCode}, useCountryCode must be true
• if you used the pattern {languageCode}, useCountryCode must be false

The fallbackFile parameter was entroduces with the version 0.1.0 and provide a default language, used when the translation for the current running system is not provided. This should contain the name of a valid json file in assets folder.

If there isn't any translation available for the required key, the same key is returned.

flutter_i18n in action

After the configuration steps, the only thing to do is invoke the following method:

FlutterI18n.translate(buildContext, "your.key")

Where:

• buildContext is the BuildContext instance of the widget
• your.key is the key to translate

From version 0.2.0 flutter_i18n manage strings that contain parameters; an example can be: "Hello, {user}!" For a correct translation, you must use the third parameter of the translate method, a Map<String, String> where:

• the keys are the placeholders used in the .json file (i.e. user)
• the values are what you want to display

From version 0.3.0 flutter_i18n supports language change at runtime. To use it, you must invoke the method

await FlutterI18n.refresh(buildContext, languageCode, {countryCode});

NOTE: countryCode is optional.