I've tried testing this on API 27 and it works perfectly, but when I switched to API 21 it wouldn't change the language.
private void setLocale(String lang) {
Locale locale = new Locale(lang);
Locale.setDefault(locale);
Configuration config = new Configuration();
//config.locale = locale;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1){
config.setLocale(locale);
} else {
config.locale = locale;
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1){
getBaseContext().createConfigurationContext(config);
} else {
getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
}
//getBaseContext().getResources().updateConfiguration(config, getBaseContext().getResources().getDisplayMetrics());
SharedPreferences.Editor editor = getSharedPreferences("Settings", MODE_PRIVATE).edit();
editor.putString("My_Lang", lang);
editor.apply();
}
public void loadlocale(){
SharedPreferences prefs = getSharedPreferences("Settings", Activity.MODE_PRIVATE);
String language = prefs.getString("My_Lang", "");
setLocale(language);
}
I call "loadlocal()" before the setContentView in the onCreate.
And in an onClickListener I execute
....
setLocale("en");
recreate();
//or
setLocale("ar");
recreate();
....
