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ContextWrapper to propperly update the locale of your application. The default implementation takes the first supported locale, otherwise takes the default locale.. Gist to generate the supported and default locale: Gist to generate the supported locales: https://gist.github.com/ElianFabian/e94071f348998c24bedaa959ddb8df40
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| import android.annotation.SuppressLint | |
| import android.app.Application | |
| import android.content.ComponentCallbacks | |
| import android.content.Context | |
| import android.content.ContextWrapper | |
| import android.content.res.Configuration | |
| import android.content.res.Resources | |
| import android.os.Build | |
| import android.os.LocaleList | |
| import androidx.core.os.ConfigurationCompat | |
| import androidx.core.os.LocaleListCompat | |
| import java.util.Locale | |
| fun Application.createSyncLocaleContextWrapper(baseContext: Context): ContextWrapper { | |
| val localeContextWrapper = LocaleContextWrapper(baseContext) | |
| registerComponentCallbacks(object : ComponentCallbacks { | |
| override fun onConfigurationChanged(newConfig: Configuration) { | |
| localeContextWrapper.setLocaleList(newConfig.getLocaleList()) | |
| } | |
| override fun onLowMemory() = Unit | |
| }) | |
| return localeContextWrapper | |
| } | |
| class LocaleContextWrapper( | |
| application: Application, | |
| baseContext: Context, | |
| private val createUpdatedLocaleContext: (oldContext: Context, newConfig: Configuration) -> Context, | |
| ) : ContextWrapper( | |
| createUpdatedLocaleContext(baseContext, baseContext.resources.configuration) | |
| ) { | |
| init { | |
| application.registerComponentCallbacks(object : ComponentCallbacks { | |
| override fun onConfigurationChanged(newConfig: Configuration) { | |
| _baseContext = createUpdatedLocaleContext(_baseContext, newConfig) | |
| } | |
| override fun onLowMemory() = Unit | |
| }) | |
| } | |
| private var _baseContext = super.getBaseContext() | |
| override fun getResources(): Resources = _baseContext.resources | |
| override fun getTheme(): Resources.Theme = _baseContext.theme | |
| override fun getBaseContext(): Context = _baseContext | |
| override fun setTheme(resid: Int) { | |
| _baseContext.setTheme(resid) | |
| } | |
| } | |
| @Suppress("DEPRECATION") | |
| @SuppressLint("ObsoleteSdkInt") | |
| private fun createContextWithFirstSupportedUserLocaleOrForceDefault( | |
| context: Context, | |
| configuration: Configuration, | |
| defaultLanguage: String, | |
| supportedLanguages: List<String>, | |
| ): Context { | |
| val userSupportedLocales = ConfigurationCompat | |
| .getLocales(configuration) | |
| .getMatches(supportedLanguages) | |
| val newLocales = userSupportedLocales.ifEmpty { | |
| listOf(Locale(defaultLanguage)) | |
| } | |
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { | |
| val newLocaleList = LocaleList(*newLocales.toTypedArray()) | |
| LocaleList.setDefault(newLocaleList) | |
| configuration.setLocales(newLocaleList) | |
| } | |
| else { | |
| val newLocale = newLocales.first() | |
| Locale.setDefault(newLocale) | |
| configuration.locale = newLocale | |
| } | |
| return context.createConfigurationContext(configuration) | |
| } | |
| private fun LocaleListCompat.getMatches(supportedLocales: List<String>): List<Locale> { | |
| val currentSupportedLocales = supportedLocales.toMutableList() | |
| return buildList { | |
| while (currentSupportedLocales.isNotEmpty()) { | |
| val match = getFirstMatch(currentSupportedLocales.toTypedArray()) ?: continue | |
| add(match) | |
| currentSupportedLocales.removeAll { supportedLocale -> | |
| match.toString().startsWith(supportedLocale) | |
| } | |
| } | |
| } | |
| } |
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| import android.annotation.SuppressLint | |
| import android.os.Build | |
| import android.os.LocaleList | |
| import androidx.core.os.LocaleListCompat | |
| import java.util.Locale | |
| fun LocaleListCompat.getMatches(supportedLocales: List<String>): List<Locale> { | |
| val currentSupportedLocales = supportedLocales.toMutableList() | |
| return buildList { | |
| while (currentSupportedLocales.isNotEmpty()) { | |
| val match = getFirstMatch(currentSupportedLocales.toTypedArray()) ?: continue | |
| add(match) | |
| currentSupportedLocales.removeAll { supportedLocale -> | |
| match.toString().startsWith(supportedLocale) | |
| } | |
| } | |
| } | |
| } | |
| fun LocaleList.toLocales(): List<Locale> { | |
| return buildList { | |
| for (i in 0 until size()) { | |
| add(get(i)) | |
| } | |
| } | |
| } | |
| @Suppress("DEPRECATION") | |
| @SuppressLint("ObsoleteSdkInt") | |
| fun Configuration.getLocaleList(): List<Locale> { | |
| return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { | |
| locales.toLocales() | |
| } | |
| else listOf(locale) | |
| } |
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| import android.app.Application | |
| import android.content.Context | |
| class YourApplication : Application() { | |
| override fun attachBaseContext(base: Context?) { | |
| if (base == null) { | |
| return super.attachBaseContext(null) | |
| } | |
| val localeContext = createSyncLocaleContextWrapper(base) | |
| super.attachBaseContext(localeContext) | |
| } | |
| } |
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