ContextWrapper.kt

package com.coin.profit.base

import android.os.Build
import android.annotation.TargetApi
import android.content.Context
import android.content.ContextWrapper
import android.content.res.Configuration
import java.util.*


/**
 * Created by user on 14.07.2017.
 */
class MyContextWrapper(base: Context) : ContextWrapper(base) {
    companion object {

        @Suppress("DEPRECATION")
        fun wrap(ctx: Context, language: String): ContextWrapper {
            var context = ctx
            val config = context.resources.configuration
            val sysLocale = when {
                Build.VERSION.SDK_INT >= Build.VERSION_CODES.N -> getSystemLocale(config)
                else -> getSystemLocaleLegacy(config)
            }
            if (language != "") {
                val locale = Locale(language)
                Locale.setDefault(locale)
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    setSystemLocale(config, locale)
                } else {
                    setSystemLocaleLegacy(config, locale)
                }
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
                    config.setLayoutDirection(locale)
                    context = context.createConfigurationContext(config)
                } else {
                    context.resources.updateConfiguration(config, context.resources.displayMetrics)
                }
            }
            return CoinContextWrapper(context)
        }

        @Suppress("DEPRECATION")
        fun update(ctx: Context, language: String){
            val config = ctx.resources.configuration
            if (language != "") {
                val locale = Locale(language)
                Locale.setDefault(locale)
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    setSystemLocale(config, locale)
                } else {
                    setSystemLocaleLegacy(config, locale)
                }
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
                    config.setLayoutDirection(locale)
                    //context = context.createConfigurationContext(config)
                } else {
                    ctx.resources.updateConfiguration(config, ctx.resources.displayMetrics)
                }
            }
        }

        @Suppress("DEPRECATION")
        private fun getSystemLocaleLegacy(config: Configuration) = config.locale

        @TargetApi(Build.VERSION_CODES.N)
        private fun getSystemLocale(config: Configuration) = config.locales[0]

        @Suppress("DEPRECATION")
        private fun setSystemLocaleLegacy(config: Configuration, locale: Locale) {
            config.locale = locale
        }

        @TargetApi(Build.VERSION_CODES.N)
        private fun setSystemLocale(config: Configuration, locale: Locale) {
            config.setLocale(locale)
        }
    }
}

usage.kt

override fun attachBaseContext(newBase: Context) {
        super.attachBaseContext(MyContextWrapper.wrap(newBase,appLanguage))
    }