LocaleHelper.java

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package org.libreoffice;
 
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;
 
public class LocaleHelper {
 
    private static final String SELECTED_LANG = "org.libreoffice.selected.lang";
    // value for language that indicates that system's default language should be used
    public static final String SYSTEM_DEFAULT_LANGUAGE = "SYSTEM_DEFAULT_LANGUAGE";
 
    public static Context onAttach(Context context){
        String lang = getPersistedData(context, Locale.getDefault().getLanguage());
        return setLocale(context, lang);
    }
 
    public static Context setLocale(Context context, String lang) {
        persist(context, lang);
        return updateResources(context, lang);
    }
 
    @SuppressWarnings("deprecation")
    private static Context updateResources(Context context, String lang) {
        Locale locale;
        if (lang.equals(SYSTEM_DEFAULT_LANGUAGE)) {
            locale = Locale.getDefault();
        } else {
            locale = new Locale(lang);
        }
        Locale.setDefault(locale);
 
        Resources res = context.getResources();
        Configuration cfg = res.getConfiguration();
        cfg.locale = locale;
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1)
            cfg.setLayoutDirection(locale);
 
        res.updateConfiguration(cfg, res.getDisplayMetrics());
        return context;
    }
 
    private static void persist(Context context, String lang) {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
        preferences.edit().putString(SELECTED_LANG, lang);
        preferences.edit().apply();
    }
 
    private static String getPersistedData(Context context, String lang) {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
        return preferences.getString(SELECTED_LANG, lang);
    }
}