Localization not working after app restart

Question

I'm including localization to translate my app intro three different languages, after setting up the translated strings of each language, I go to preference settings and I check a checkbox and and the translation works fine, the problem is that when I restart the app , localization even though I have saved the chosen language in sharedpreference and retreiving it in mainactivity

*This is how I'm setting the languages

var sharedPreferences = requireContext().getSharedPreferences("prefs", 
           Context.MODE_PRIVATE)
 var editor = sharedPreferences.edit()

 spanishCheckBox.setOnPreferenceChangeListener(object : Preference.OnPreferenceChangeListener{
                override fun onPreferenceChange(preference: Preference?, newValue: Any?): Boolean {
                    var isSpanishChecked = newValue as Boolean
                    if(isSpanishChecked){
                        var Lang = "es"
                        editor.putString("key",Lang)
                        editor.apply()
                        var local = Locale(Lang)
                        var configuration = Configuration()
                        configuration.locale = local
                        resources.updateConfiguration(configuration,resources.displayMetrics)

                        englishCheckBox.isChecked = false
                        frenchCheckBox.isChecked = false

                        Intent(requireContext(),MainActivity::class.java).also {
                            it.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK)
                            startActivity(it)
                        }
                    }
                    return true
                }
            })

• This is how i m retreiving data in mainactivity

 fun LoadLanguageConfiguration(){
        var sharedpreferences = getSharedPreferences("prefs", Context.MODE_PRIVATE)
        var langCode = sharedpreferences.getString("key","")
        var local = Locale(langCode)
        var configuration = Configuration()
        configuration.locale = local
        baseContext.createConfigurationContext(configuration)
    }

The translation only works when I set the language in the app, but when I restart the app, it goes back to default language which is English.

Answer 1

The problem is that I was not starting my language loading method at the start and before everything, so I put it as first method in my oncreate and everything works as supposed to.