content: package com.gowtham.library.utils;
  
  
  import android.annotation.TargetApi;
  import android.content.Context;
  import android.content.SharedPreferences;
  import android.content.res.Configuration;
  import android.content.res.Resources;
  import android.os.Build;
  import android.preference.PreferenceManager;
  
  import java.util.Locale;
  
  /**
   * This class is used to change your application locale and persist this change for the next time
   * that your app is going to be used.
   * <p/>
   * You can also change the locale of your application on the fly by using the setLocale method.
   * <p/>
   *
   * @author gunhansancar
   * Created by mazen on 11/9/17.
   */
  public class LocaleHelper {
  
      private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";
  
      public static Context onAttach(Context context) {
          String lang = getPersistedData(context, Locale.getDefault().getLanguage());
          return setLocale(context, lang);
      }
  
      public static Context onAttach(Context context, String defaultLanguage) {
          String lang = getPersistedData(context, defaultLanguage);
          return setLocale(context, lang);
      }
  
      public static String getLanguage(Context context) {
          return getPersistedData(context, Locale.getDefault().getLanguage());
      }
  
      private static Context setLocale(Context context, String language) {
          persist(context, language);
  
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
              return updateResources(context, language);
          }
  
          return updateResourcesLegacy(context, language);
      }
  
      private static String getPersistedData(Context context, String defaultLanguage) {
          SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
          return preferences.getString(SELECTED_LANGUAGE, defaultLanguage);
      }
  
      private static void persist(Context context, String language) {
          SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
          SharedPreferences.Editor editor = preferences.edit();
  
          editor.putString(SELECTED_LANGUAGE, language);
          editor.apply();
      }
  
      @TargetApi(Build.VERSION_CODES.N)
      private static Context updateResources(Context context, String language) {
          Locale locale = new Locale(language);
          Locale.setDefault(locale);
  
          Configuration configuration = context.getResources().getConfiguration();
          configuration.setLocale(locale);
          configuration.setLayoutDirection(locale);
  
          return context.createConfigurationContext(configuration);
      }
  
      private static Context updateResourcesLegacy(Context context, String language) {
          Locale locale = new Locale(language);
          Locale.setDefault(locale);
  
          Resources resources = context.getResources();
  
          Configuration configuration = resources.getConfiguration();
          configuration.locale = locale;
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
              configuration.setLayoutDirection(locale);
          }
  
          resources.updateConfiguration(configuration, resources.getDisplayMetrics());
  
          return context;
      }
  }