how to add a welcome activity to allow user to choose his language and change language of all activitys

I'm trying to build a very simple application with many activities.

In this app I have a WelcomeActivity for user to choose his language with two buttons, one for English and one for Arabic then i want after user choose his language , the language will be changing at all activities and this WelcomeActivity will be run only for the first time and never show again.

any help ?

Solution

You can do something like this.

Locale locale = new Locale("ar”,"XX");

 private void updateLocale(locale) {
    final Configuration configuration = getResources().getConfiguration();
    Locale.setDefault(baseLocal);
    configuration.locale = baseLocal;
    getResources().updateConfiguration(configuration, getResources().getDisplayMetrics());
}

How to restore the selected language in next launch.? [ Better to store it in a shared preference.] I hope you might be knowing how to store. You just need to store "ar" or "en" text in preference. On next launch you have to read back and form Locale and pass updateLocale() method.

You can make use OnConfigurationChanged Method

@Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);

        Configuration configuration = getResources().getConfiguration();
        Locale.setDefault(mCurrentLocale);
        configuration.locale = mCurrentLocale;..locale from preference or latest selected.
        getResources().updateConfiguration(configuration, getResources().getDisplayMetrics());      
    }

Where mCurrentLocale can be read from shared preference which u stored earlier.

How to store language in shared preference in this case

   final SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(
                    this);
sharedPreferences().putString(KEY_STORE_CURRENT_LOCALE, language_code).commit();

How to get language from shared preference in this case

        final String current = sharedPreferences.getString(KEY_STORE_CURRENT_LOCALE,
               language_code_english);

I hope this will help!