I just tested Android localization and I found out that you can use any arbitrary region and it will work.
Add a folder to the project with name like values-sr-rZZ
where ZZ is a fictitious region which never existed.
Then add the following code to the Application class, I got it from here and slightly changed:
public class MainApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
Resources res = this.getResources();
Configuration conf = res.getConfiguration();
boolean isLatinAlphabet = PreferenceManager.getDefaultSharedPreferences(this)... // get a value from the application settings
if(conf.locale.getLanguage().equals("sr") && isLatinAlphabet) {
conf.locale = new Locale("sr", "ZZ");
res.updateConfiguration(conf, res.getDisplayMetrics());
}
}
}
In this code the locale will be changed only if the user has chosen the serbian language as the default (conf.locale.getLanguage().equals("sr")
) and also checked some checkbox in the app preferences (isLatinAlphabet
).
You can use a different condition and change it as you like.
Also such dynamic way of changing language can have bugs with menu items on older devices, but it isn't reproduced on newer devices.