Add support for "app languages" on Android

[abejfehr]

Why it is needed?

It's nice to be able to choose a language on a per-app basis instead of setting the whole OS, and it looks like that's possible now on Android: https://developer.android.com/guide/topics/resources/app-languages

Possible implementation

No response

Code sample

No response

[zoontek]

@abejfehr It's already supported. Android now allow the user to overrides the app language in app settings and it updates what's returned by existing react-native-localize functions.

EDIT: Hmmm, I forget Android API are often stupidly designed. Will investigate on extras setApplicationLocales() and getApplicationLocales(). But if this allow overriding from the app directly, this is a terrible feature for user experience.

[itsramiel]

EDIT: Hmmm, I forget Android API are often stupidly designed. Will investigate on extras setApplicationLocales() and getApplicationLocales(). But if this allow overriding from the app directly, this is a terrible feature for user experience.

What is your opinion on this @zoontek ?

The android apis make it just so that you dont have to go to the settings to change the per app language. From the linked guide:

If you use the public APIs for your in-app language picker, the device's system settings are automatically updated to match whichever language the user selects through your in-app experience.

These APIs automatically sync with system settings; therefore, apps that use these APIs to create custom in-app language pickers will ensure their users have a consistent user experience regardless of where they select their language preferences

[zoontek]

@itsramiel This does not seems like a lot of work, but it's very low-priority for me at the moment. Let’s place a small bid on it and see if companies have a real appetite for it.

[zoontek]

You can now pledge behind and help support this effort using Polar.sh:

[davenewton069]

I was having a diff kind of Error with this module on android simulator:

ERROR Invariant Violation: TurboModuleRegistry.getEnforcing(...): 'RNLocalize' could not be found. Verify that a module by this name is registered in the native binary.Bridgeless mode: false. TurboModule interop: false. Modules loaded: {"NativeModules":["PlatformConstants","LogBox","SourceCode","Timing","AppState","BlobModule","WebSocketModule","DevSettings","DevToolsSettingsManager","Networking","Appearance","DevLoadingView","HeadlessJsTaskSupport","DeviceInfo","UIManager","ImageLoader","SoundManager","IntentAndroid","DeviceEventManager","RNCSafeAreaContext","NativeAnimatedModule","I18nManager","RNGoogleSignin","RNCAsyncStorage"],"TurboModules":[],"NotFound":["NativePerformanceCxx","NativePerformanceObserverCxx","RedBox","BugReporting","LinkingManager","NativeReactNativeFeatureFlagsCxx","RNSModule","PlatformLocalStorage","RNC_AsyncSQLiteDBStorage","RNLocalize"]}, js engine: hermes [Component Stack]
ERROR Invariant Violation: TurboModuleRegistry.getEnforcing(...): 'RNLocalize' could not be found. Verify that a module by this name is registered in the native binary.Bridgeless mode: false. TurboModule interop: false. Modules loaded: {"NativeModules":["PlatformConstants","LogBox","SourceCode","Timing","AppState","BlobModule","WebSocketModule","DevSettings","DevToolsSettingsManager","Networking","Appearance","DevLoadingView","HeadlessJsTaskSupport","DeviceInfo","UIManager","ImageLoader","SoundManager","IntentAndroid","DeviceEventManager","RNCSafeAreaContext","NativeAnimatedModule","I18nManager","RNGoogleSignin","RNCAsyncStorage"],"TurboModules":[],"NotFound":["NativePerformanceCxx","NativePerformanceObserverCxx","RedBox","BugReporting","LinkingManager","NativeReactNativeFeatureFlagsCxx","RNSModule","PlatformLocalStorage","RNC_AsyncSQLiteDBStorage","RNLocalize"]}, js engine: hermes [Component Stack]