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@rommansabbir
Created February 16, 2023 16:15
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/**
* Default implementation of [LocaleHelperKt].
*/
class DefaultLocaleHelper private constructor(context: Context) : BaseLocaleHelper(context) {
companion object {
/* Mark the instance as Volatile*/
@Volatile
private var instance: LocaleHelperKt? = null
private var LOCK: Any = Any()
/**
* Return an instance of [LocaleHelperKt].
*
* @param context [Context].
*
* @return Instance of [LocaleHelperKt].
*/
fun getInstance(context: Context): LocaleHelperKt {
synchronized(LOCK) {
if (instance == null) instance = DefaultLocaleHelper(context)
return instance!!
}
}
}
override fun setCurrentLocale(language: String): Context {
return setLocale(context, language)
}
override fun onAttach(defaultLanguage: String?): Context {
val lang = getPersistedLocale(defaultLanguage ?: Locale.getDefault().language)
return setLocale(context, lang)
}
override fun getCurrentLocale(): String =
getPersistedLocale(Locale.getDefault().language)
}
/**
* Base Locale Helper Class.
*
* This provide implementation of caching (SET, GET) selected/current locale by using [PreferenceManager].
*
* Also, provide implementation of setting new locale.
*
* @param context [Context].
*/
@Suppress("DEPRECATION")
abstract class BaseLocaleHelper(internal val context: Context) :
LocaleHelperKt {
companion object {
private const val SELECTED_LANGUAGE = "LocaleHelperKt_SelectedLanguage"
}
/**
* Get persisted locale from [SharedPreferences].
*
* @param defaultLocale If persisted locale not found, return the [defaultLocale].
*
* @return Current locale ([String])
*/
internal fun getPersistedLocale(defaultLocale: String): String {
return cacheStorage.getString(SELECTED_LANGUAGE, defaultLocale) ?: defaultLocale
}
/* Provide lazy an instance of [SharedPreferences] */
private val cacheStorage: SharedPreferences by lazy {
PreferenceManager.getDefaultSharedPreferences(
context
)
}
/**
* Update resource configuration and [Context].
*
* @param context [Context]
* @param language [String]
*
* @return Context itself ([Context]])
*/
private fun updateResources(context: Context, language: String): Context {
val locale = Locale(language)
Locale.setDefault(locale)
val configuration = context.resources.configuration
configuration.setLocale(locale)
return context.createConfigurationContext(configuration)
}
/**
* Set new locale to the resource based on API versions.
*
* @param context Application [Context].
* @param newLocale New locale to be set.
*
* @return Context itself ([Context]).
*/
private fun baseSetLocale(context: Context, newLocale: Locale): Context {
var tmpContext = context
val res = tmpContext.resources
val configuration = res.configuration
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
configuration.setLocale(newLocale)
val localeList = LocaleList(newLocale)
LocaleList.setDefault(localeList)
configuration.setLocales(localeList)
tmpContext = tmpContext.createConfigurationContext(configuration)
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
configuration.setLocale(newLocale)
res.updateConfiguration(configuration, res.displayMetrics)
} else {
configuration.locale = newLocale
res.updateConfiguration(configuration, res.displayMetrics)
}
return tmpContext
}
/**
* Set new locale and cache the new locale to [SharedPreferences].
*
* @param context Application [Context].
* @param newLocale New locale to be set.
*
* @return Context itself ([Context]).
*/
internal fun setLocale(context: Context, newLocale: String): Context {
cacheStorage.edit().apply {
putString(SELECTED_LANGUAGE, newLocale)
apply()
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
return updateResources(context, newLocale)
}
val locale = Locale(newLocale)
return baseSetLocale(context, locale)
}
}
/**
* Simple Locale Helper for Android.
*/
interface LocaleHelperKt {
fun onAttach(defaultLanguage: String? = null): Context
fun getCurrentLocale(): String
fun setCurrentLocale(language: String): Context
}
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