How to change the whole application language? [duplicate]

Question

I am making an app in which I want to have a page where I show a language selection page. So far I've included English, Hindi, and Marathi, with English set as the default.

My question is:

1. how to change the whole application language in Selected Language?

2. After choose the language whenever I reopen the application its give previous chosen language?

Answer 1

Put your all text in String file. For each language create separate String file(Deutsch values-de/strings.xml, French values-fr/strings.xml) and while you need to change language call following function. For English language set "en" for another set corresponding key

#Kotlin

val config = resources.configuration
val locale = Locale("en")
Locale.setDefault(locale)
config.locale = locale
resources.updateConfiguration(config, resources.displayMetrics)

#Android Java

Configuration config = getBaseContext().getResources().getConfiguration();
 Locale locale = new Locale("en");
 Locale.setDefault(locale);
 config.locale = locale;
 getBaseContext().getResources().updateConfiguration(config, 
            getBaseContext().getResources().getDisplayMetrics());