demezy / localize_and_translate

Flutter localization in easy steps

localize_and_translate

Flutter localization in easy steps

Getting Started

🔩 Installation

Add to your pubspec.yaml:

dependencies:
  localize_and_translate: <last_version>

Create folder and add translation files like this

assets
└── lang
    ├── {languageCode}.{ext}                  //only language code
    └── {languageCode}-{countryCode}.{ext}    //or full locale code

Example:

assets
└── lang
    ├── en.json
    └── en-US.json 

Declare your assets localization directory in pubspec.yaml:

flutter:
  assets:
    - assets/lang/

⚠️ Note on iOS

For translation to work on iOS you need to add supported locales to ios/Runner/Info.plist as described here.

Example:

<key>CFBundleLocalizations</key>
<array>
  <string>en</string>
  <string>nb</string>
</array>

⚙️ Configuration

Add EasyLocalization widget like in example

import 'package:flutter/material.dart';
import 'package:localize_and_translate/localize_and_translate.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
    await LocalizeAndTranslate.init(
        assetLoader: const AssetLoaderRootBundleJson('assets/lang/'), // <-- change the path of the translation files
        supportedLanguageCodes: <String>['ar', 'en'], // <-- or supportedLocales: [Locale('ar', 'DZ'), Locale('en', 'US')],
    );
  
    runApp(
        LocalizedApp(
            child: MaterialApp(
              // style 1
              builder: LocalizeAndTranslate.directionBuilder,
              // style 2
              builder: (BuildContext context, Widget? child) {
                child = LocalizeAndTranslate.directionBuilder(context, child);
        
                return child;
              },
              home: const MyHomePage(),
              locale: context.locale,
              localizationsDelegates: context.delegates,
              supportedLocales: context.supportedLocales,
            ),
        ),
    );
}

Full example

📜 Localize And Translate init properties

Properties	Required	Description
supportedLanguageCodes	or next	List of supported languages to be converted to locales.
supportedLocales	or prev	List of supported locales.
defaultType	false	Path to your folder with localization files.
assetLoader	true	Class loader for localization values. You can create your own class.

Usage

Init

Call LocalizeAndTranslate.init(params) in your main before runApp.

void main() async{
  // ...
  // Needs to be called so that we can await for LocalizeAndTranslate.init();
  WidgetsFlutterBinding.ensureInitialized();

  await LocalizeAndTranslate.init(
    assetLoader: const AssetLoaderRootBundleJson('assets/lang/'), // <-- change the path of the translation files
    supportedLocales: <Locale>[Locale('ar', 'DZ'), Locale('en', 'US')], // <-- or  supportedLanguageCodes: <String>['ar', 'en'],
    defaultType: LocalizationDefaultType.asDefined, // <-- change the default type
  );
  // ...
  runApp(
    // ...
  );
  // ...
}

context extensions

LocalizeAndTranslate uses extension methods [BuildContext] for access to some values.

Example:

// set locale
context.setLocale(Locale('en', 'US'));

// set language code
context.setLanguageCode('en');

// get locale
context.locale; // en_US

// get language code
context.languageCode; // en

Translate tr()

Main function for translate your language keys

print('title'.tr(defaultValue: 'Awesome App')); //String

Translations

as json values pair

{
  "title": "Awesome App",
  "hello": "Hello",
  "world": "World!",
}

API Reference

Properties	Extension	Type	Description
countryCode	context	Property	Gets the country code of the current locale.
delegates	context	Property	Gets the list of localization delegates used for translation.
init	no	Method	Initializes the plugin with the desired configuration values.
locale	context	Property	Gets the current locale being used for localization.
resetLocale	context	Method	Resets the current locale to its default value.
setLanguageCode	context	Method	Sets the language code for localization.
setLocale	context	Method	Sets the current locale to one of the supported locales.
supportedLocales	context	Property	Gets the list of supported locales for the app.
tr	string	Method	Retrieves the translated string for a given localization key.

Reset everything to default values passed through init().

Example:

RaisedButton(
  onPressed: (){
    context.resetLocale();
  },
  child: Text(LocaleKeys.reset_locale).tr(),
)

Contributors

Contributors