locale_switcher 0.8.0

A widget for switching the locale of your application with 2 lines of code.

locale_switcher

A widget for switching the locale of your application.

Content

• About
• Features
• Usage
• Example
• Todo
• FAQ

About

This package allows you to add locale-switching functionality to your app with just a few lines of code.

It depends on intl package (not tested with other localization packages).

Features

• Contains widget to switch locale - LocaleSwitcher:
  • which includes a list of locales for you app with additional option to use system locale,
  • it offers several constructors: LocaleSwitcher.toggle, LocaleSwitcher.menu or LocaleSwitcher.custom,
• Contains a button SelectLocaleButton to open popup window,
• Optionally stores the last selected locale in [SharedPreferences],
• Provides a LocaleManager.realLocaleNotifier to dynamically change the app's locale (and notifier LocaleManager.locale to listen to locale changes).
• Observes changes in the system locale.

Usage

1. Wrap MaterialApp or CupertinoApp with LocaleManager:

  @override
Widget build(BuildContext context, WidgetRef ref) {
  return LocaleManager(
      child: MaterialApp(
        locale: LocaleManager.locale.value,
        localizationsDelegates: AppLocalizations.localizationsDelegates,
        supportedLocales: AppLocalizations.supportedLocales,
  //...

2. Add LocaleSwitcher widget anywhere into your app.
3. Or use SelectLocaleButton or just use showSelectLocaleDialog.

Note: localization should be set up before you start to use this package, if there some problems - please, check next section and/or intl documentation, before reporting bug.

Troubleshooting

Checking that intl package is setup correctly:

The following instructions are from intl package, so you probably already did them:

In pubspec.yaml:

dependencies: # in this section
  intl: 
  flutter_localizations:
    sdk: flutter
dev_dependencies: # in this section 
  build_runner:  
flutter: # in this section 
  generate: true  

Optionally - in l10n.yaml:

arb-dir: lib/src/l10n
template-arb-file: intl_en.arb
output-dir: lib/src/l10n/generated
output-localization-file: app_localizations.dart
untranslated-messages-file: desiredFileName.txt
preferred-supported-locales: [ "en", "vi", "de" ]
nullable-getter: false

Example

Online Example here

Example Code

TODO:

• Test with other localization system

FAQ

- How to change order of languages?

Languages are shown in the same order as they listed in l10n.yaml.

- How to change flag of language?

Use LocaleManager.reassign parameter like this:

LocaleManager(
  reassign: {'en': ['GB', 'English', <Your_icon_optional>]}
  // (first two options are required, third is optional)
  // first option is the code of country which flag you want to use
...
)

- How to use localization outside of MaterialApp(or CupertinoApp)?

Here is a useful example, although it is not depend on this package:

import 'package:flutter_gen/gen_l10n/app_localizations.dart';

/// Access localization through locale
extension LocaleWithDelegate on Locale {
  /// Get class with translation strings for this locale.
  AppLocalizations get tr => lookupAppLocalizations(this);
}

Locale("en").tr.example
// or 
LocaleManager.locale.value.tr.example