- π Easy translations for many languages
- π Load translations as JSON, CSV, Yaml, Xml using Easy Localization Loader
- πΎ React and persist to locale changes
- β‘ Supports plural, gender, nesting, RTL locales and more
- β©οΈ Fallback locale keys redirection
βοΈ Error widget for missing translations- β€οΈ Extension methods on
TextandBuildContext - π» Code generation for localization files and keys.
- π‘οΈ Null safety
- π¨οΈ Customizable logger.
Add to your pubspec.yaml:
dependencies:
easy_localization: <last_version>Create folder and add translation files like this
assets
βββ translations
βββ {languageCode}.{ext} //only language code
βββ {languageCode}-{countryCode}.{ext} //or full locale code
Example:
assets
βββ translations
βββ en.json
βββ en-US.json
Declare your assets localization directory in pubspec.yaml:
flutter:
assets:
- assets/translations/You can use JSON,CSV,HTTP,XML,Yaml files, etc.
See Easy Localization Loader for more info.
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>Add EasyLocalization widget like in example
import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:easy_localization/easy_localization.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await EasyLocalization.ensureInitialized();
runApp(
EasyLocalization(
supportedLocales: [Locale('en', 'US'), Locale('de', 'DE')],
path: 'assets/translations', // <-- change the path of the translation files
fallbackLocale: Locale('en', 'US'),
child: MyApp()
),
);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
localizationsDelegates: context.localizationDelegates,
supportedLocales: context.supportedLocales,
locale: context.locale,
home: MyHomePage()
);
}
}| Properties | Required | Default | Description |
|---|---|---|---|
| key | false | Widget key. | |
| child | true | Place for your main page widget. | |
| supportedLocales | true | List of supported locales. | |
| path | true | Path to your folder with localization files. | |
| assetLoader | false | RootBundleAssetLoader() |
Class loader for localization files. You can use custom loaders from Easy Localization Loader or create your own class. |
| extraAssetLoaders | false | null | A List of asset loaders, in case of needing assets being loaded from a different module or package. (e.g. adding a package that uses [Easy Localization Loader]). |
| fallbackLocale | false | Returns the locale when the locale is not in the list supportedLocales. |
|
| startLocale | false | Overrides device locale. | |
| saveLocale | false | true |
Save locale in device storage. |
| useFallbackTranslations | false | false |
If a localization key is not found in the locale file, try to use the fallbackLocale file. |
| useFallbackTranslationsForEmptyResources | false | false |
If translation is empty in the locale file, try to use the fallbackLocale file. Does not take effect if useFallbackTranslations is false. |
| useOnlyLangCode | false | false |
Trigger for using only language code for reading localization files. Example: en.json //useOnlyLangCode: trueen-US.json //useOnlyLangCode: false |
| errorWidget | false | FutureErrorWidget() |
Shows a custom error widget when an error occurs. |
Call EasyLocalization.ensureInitialized() in your main before runApp.
void main() async{
// ...
// Needs to be called so that we can await for EasyLocalization.ensureInitialized();
WidgetsFlutterBinding.ensureInitialized();
await EasyLocalization.ensureInitialized();
// ...
runApp(....)
// ...
}Easy localization uses extension methods [BuildContext] for access to locale.
It's the easiest way change locale or get parameters π.
βΉοΈ No breaking changes, you can use old the static method EasyLocalization.of(context)
Example:
context.setLocale(Locale('en', 'US'));
print(context.locale.toString());Main function for translate your language keys
You can use extension methods of [String] or [Text] widget, you can also use tr() as a static function.
Text(context.tr('title'))You can also use tr() without [Context] as a static function.
This is not recommend in build methods, because the widget won't rebuild when the language changes.
Text('title').tr() //Text widget
print('title'.tr()); //String
var title = tr('title') //Static function| Name | Type | Description |
|---|---|---|
| args | List<String> |
List of localized strings. Replaces {} left to right |
| namedArgs | Map<String, String> |
Map of localized strings. Replaces the name keys {key_name} according to its name |
| gender | String |
Gender switcher. Changes the localized string based on gender string |
Example:
{
"msg":"{} are written in the {} language",
"msg_named":"Easy localization is written in the {lang} language",
"msg_mixed":"{} are written in the {lang} language",
"gender":{
"male":"Hi man ;) {}",
"female":"Hello girl :) {}",
"other":"Hello {}"
}
}// args
Text('msg').tr(args: ['Easy localization', 'Dart']),
// namedArgs
Text('msg_named').tr(namedArgs: {'lang': 'Dart'}),
// args and namedArgs
Text('msg_mixed').tr(args: ['Easy localization'], namedArgs: {'lang': 'Dart'}),
// gender
Text('gender').tr(gender: _gender ? "female" : "male"),
You can translate with pluralization.
To insert a number in the translated string, use {}. Number formatting supported, for more information read NumberFormat class documentation.
You can use extension methods of [String] or [Text] widget, you can also use plural() as a static function.
| Name | Type | Description |
|---|---|---|
| value | num |
Number value for pluralization |
| args | List<String> |
List of localized strings. Replaces {} left to right |
| namedArgs | Map<String, String> |
Map of localized strings. Replaces the name keys {key_name} according to its name |
| name | String |
Name of number value. Replaces {$name} to value |
| format | NumberFormat |
Formats a numeric value using a NumberFormat class |
Example:
{
"day": {
"zero":"{} Π΄Π½Π΅ΠΉ",
"one": "{} Π΄Π΅Π½Ρ",
"two": "{} Π΄Π½Ρ",
"few": "{} Π΄Π½Ρ",
"many": "{} Π΄Π½Π΅ΠΉ",
"other": "{} Π΄Π½Π΅ΠΉ"
},
"money": {
"zero": "You not have money",
"one": "You have {} dollar",
"many": "You have {} dollars",
"other": "You have {} dollars"
},
"money_args": {
"zero": "{} has no money",
"one": "{} has {} dollar",
"many": "{} has {} dollars",
"other": "{} has {} dollars"
},
"money_named_args": {
"zero": "{name} has no money",
"one": "{name} has {money} dollar",
"many": "{name} has {money} dollars",
"other": "{name} has {money} dollars"
}
}//Text widget with format
Text('money').plural(1000000, format: NumberFormat.compact(locale: context.locale.toString())) // output: You have 1M dollars
//String
print('day'.plural(21)); // output: 21 Π΄Π΅Π½Ρ
//Static function
var money = plural('money', 10.23) // output: You have 10.23 dollars
//Text widget with plural BuildContext extension
Text(context.plural('money', 10.23))
//Static function with arguments
var money = plural('money_args', 10.23, args: ['John', '10.23']) // output: John has 10.23 dollars
//Static function with named arguments
var money = plural('money_named_args', 10.23, namedArgs: {'name': 'Jane', 'money': '10.23'}) // output: Jane has 10.23 dollars
var money = plural('money_named_args', 10.23, namedArgs: {'name': 'Jane'}, name: 'money') // output: Jane has 10.23 dollarsIf there's a translation key that will always have the same concrete text as another one you can just link to it. To link to another translation key, all you have to do is to prefix its contents with an @: sign followed by the full name of the translation key including the namespace you want to link to.
Example:
{
...
"example": {
"hello": "Hello",
"world": "World!",
"helloWorld": "@:example.hello @:example.world"
}
...
}print('example.helloWorld'.tr()); //Output: Hello World!You can also do nested anonymous and named arguments inside the linked messages.
Example:
{
...
"date": "{currentDate}.",
"dateLogging": "INFO: the date today is @:date"
...
}print('dateLogging'.tr(namedArguments: {'currentDate': DateTime.now().toIso8601String()})); //Output: INFO: the date today is 2020-11-27T16:40:42.657.Formatting linked locale messages
If the language distinguishes cases of character, you may need to control the case of the linked locale messages. Linked messages can be formatted with modifier @.modifier:key
The below modifiers are available currently.
upper: Uppercase all characters in the linked message.lower: Lowercase all characters in the linked message.capitalize: Capitalize the first character in the linked message.
Example:
{
...
"example": {
"fullName": "Full Name",
"emptyNameError": "Please fill in your @.lower:example.fullName"
}
...
}Output:
print('example.emptyNameError'.tr()); //Output: Please fill in your full nameReset locale to device locale
Example:
RaisedButton(
onPressed: (){
context.resetLocale();
},
child: Text(LocaleKeys.reset_locale).tr(),
)Get device locale
Example:
print(context.deviceLocale.toString()) // OUTPUT: en_USClears a saved locale from device storage
Example:
RaisedButton(
onPressed: (){
context.deleteSaveLocale();
},
child: Text(LocaleKeys.reset_locale).tr(),
)At any time, you can take the main properties of the Easy localization widget using [BuildContext].
Are supported: supportedLocales, fallbackLocale, localizationDelegates.
Example:
print(context.supportedLocales); // output: [en_US, ar_DZ, de_DE, ru_RU]
print(context.fallbackLocale); // output: en_USCode generation supports only json files, for more information run in terminal flutter pub run easy_localization:generate -h
| Arguments | Short | Default | Description |
|---|---|---|---|
| --help | -h | Help info | |
| --source-dir | -S | resources/langs | Folder containing localization files |
| --source-file | -s | First file | File to use for localization |
| --output-dir | -O | lib/generated | Output folder stores for the generated file |
| --output-file | -o | codegen_loader.g.dart | Output file name |
| --format | -f | json | Support json or keys formats |
| --[no-]skip-unnecessary-keys | -u | false | Ignores keys defining nested object except for pluarl(), gender() keywords. |
Steps:
- Open your terminal in the folder's path containing your project
- Run in terminal
flutter pub run easy_localization:generate - Change asset loader and past import.
import 'generated/codegen_loader.g.dart';
...
void main(){
runApp(EasyLocalization(
child: MyApp(),
supportedLocales: [Locale('en', 'US'), Locale('ar', 'DZ')],
path: 'resources/langs',
assetLoader: CodegenLoader()
));
}
...- All done!
If you want to add localization support from other modules and packages you can add them via extraAssetLoaders parameter:
void main(){
runApp(EasyLocalization(
child: MyApp(),
supportedLocales: [Locale('en', 'US'), Locale('ar', 'DZ')],
path: 'resources/langs',
assetLoader: CodegenLoader()
extraAssetLoaders: [
TranslationsLoader(packageName: 'package_example_1'),
TranslationsLoader(packageName: 'package_example_2'),
],
));
}If you have many localization keys and are confused, key generation will help you. The code editor will automatically prompt keys
Steps:
- Open your terminal in the folder's path containing your project
- Run in terminal
flutter pub run easy_localization:generate -f keys -o locale_keys.g.dart - Past import.
import 'generated/locale_keys.g.dart';- All done!
How to use generated keys:
print(LocaleKeys.title.tr()); //String
//or
Text(LocaleKeys.title).tr(); //Widget[Easy Localization] logger based on [Easy Logger]
You can customize logger for you project
Lost translations keys logged like warning messages. Change [Easy Logger] level for display only errors and warnings.
EasyLocalization.logger.enableLevels = [LevelMessages.error, LevelMessages.warning];For disable logger, change Build Modes in [Easy Logger] to empty List;
EasyLocalization.logger.enableBuildModes = [];For catching logger messages you need override default printer function.
EasyLogPrinter customLogPrinter = (
Object object, {
String name,
StackTrace stackTrace,
LevelMessages level,
}) {
///Your function
print('$name: ${object.toString()}');
};
/// override printer to custom
EasyLocalization.logger.printer = customLogPrinter;Read more about Easy Logger
'en_US'.toLocale(); // Locale('en', 'US')
//with custom separator
'en|US'.toLocale(separator: '|') // Locale('en', 'US')Locale('en', 'US').toStringWithSeparator(separator: '|') // en|US
| Arabic RTL | English LTR | Error widget |
|---|---|---|
 |
 |
 |
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