expo-localization - Amazon Vega Docs

@amazon-devices/expo-localization provides an interface for native user localization information. This library provides the getCalendars() and getLocales() methods and their corresponding hooks, which return specific information about a user’s locale settings, for example languageCode, uses24HourClock, currencyCode and textDirection. No methods are provided for formatting text or values. Hooks trigger a re-render when the app locale changes. This library is system-deployed and available to React Native for Vega apps without a separate installation process. This autolinking library connects to your app at runtime. Compatibility is guaranteed only between the library and the version of React Native for Vega for which it is built.

Installation

Add the JavaScript library dependency in the package.json file.

"dependencies": {
...
"@amazon-devices/expo-localization": "~2.0.0",
"@amazon-devices/keplerscript-turbomodule-api": "~1.0.0",
...
}

Reinstall dependencies using the npm install command.

Examples

This example demonstrates how to retrieve a user’s language code.

import React from 'react';
import {StyleSheet, Text, View} from 'react-native';
import {useLocales, useCalendars} from '@amazon-devices/expo-localization';

export const App = () => {
  const locales = useLocales();
  const calendars = useCalendars();

  return (
    <View style={styles.container}>
      <Text style={styles.text}>useLocales():</Text>
      <Text style={styles.text}>{JSON.stringify(locales, null, 2)}</Text>
      <Text style={styles.text}>useCalendars():</Text>
      <Text style={styles.text}>{JSON.stringify(calendars, null, 2)}</Text>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    flexDirection: 'row',
    backgroundColor: 'white',
  },
  text: {
    color: 'black',
    fontSize: 32,
  },
});

API reference

Check out the dedicated documentation page for info about this library and API reference: Official Expo documentation for expo-localization.

Constants

Constant	Description
`locale`	Consider using `Localization.getLocales()` for a list of user preferred locales instead. An IETF BCP 47 language tag, consisting of a two-character language code and optional script, region and variant codes

Hooks

Hook	Description
`useCalendars`	Provides a list of a user’s preferred calendars, returned as an array of objects of type Calendar. Guaranteed to contain at least one element. Always returns a single element, but it’s likely to return a user preference list on some platforms in the future. If the OS settings change, the hook rerenders with a new list of calendars.
`useLocales`	Provides a list of a user’s locales, returned as an array of objects of type Locale. Guaranteed to contain at least one element. These are returned in the order the user defines in their device settings. On the web, currency and measurements systems aren’t provided, instead, they’re returned as null. If needed, you can infer them from the current region using a lookup table. If the OS settings change, the hook rerenders with a new list of locales.

Methods

Method	Description
`getCalendars`	List of user’s preferred calendars, returned as an array of objects of type `Calendar`. Guaranteed to contain at least one element. Always returns a single element, but it’s likely to return a user preference list on some platforms in the future.
`getLocales`	List of user’s locales, returned as an array of objects of type Locale. Guaranteed to contain at least one element. These objects are returned in the order the user defines in their device settings. On the web, currency and measurements systems aren’t provided, instead, they’re returned as null. If needed, you can infer them from the current region using a lookup table.

Known issues and limitations

The region field on Localization type is always null on Vega.
Functions useLocales(), useCalendars(), getCalendars() and getLocales() always return an array with one item in it, while other platforms could return empty arrays or multiple valid locales/calendars.
The deprecated constants and method getLocalizationAsync() aren’t supported on Vega.

Supported versions

Package Version	Based On	@amazon-devices/react-native-kepler version
2.0.x	14.6.0	2.0.x

For information on additional libraries, see Supported Third-Party Libraries and Services.

​Installation

​Examples

​API reference

​Constants

​Hooks

​Methods

​Known issues and limitations

​Supported versions

​Related topics