Cannot us setLanguage in PreferenceFragmentCompat about localization HOT 2 CLOSED

class SettingsFragment : PreferenceFragmentCompat(), SharedPreferences.OnSharedPreferenceChangeListener {

    private lateinit var sharedPref: SharedPreferences
    
    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
        setPreferencesFromResource(R.xml.root_preferences, rootKey)
        sharedPref = requireActivity().getSharedPreferences(MAIN_PREFERENCES, Context.MODE_PRIVATE)
    }
    
    override fun onResume() {
        super.onResume()
        preferenceScreen.sharedPreferences.registerOnSharedPreferenceChangeListener(this)
    }

    override fun onPause() {
        super.onPause()
        preferenceScreen.sharedPreferences.unregisterOnSharedPreferenceChangeListener(this)
    }
    
    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
        when (key) {
            "theme" -> {
                .
                .
                .
            }
            "language" -> {
                val languageCode = sharedPreferences?.getString("language", "nl") ?: "nl"

                val editor: SharedPreferences.Editor = sharedPref.edit()
                editor.putString(LANGUAGE_KEY, languageCode)
                editor.apply()

                updateLanguage(languageCode)

                updatePreference(key)
            }
            else -> {
                .
                .
                .
            }
        }
    }
    
    private fun updatePreference(key: String) {
        val pref: Preference? = findPreference(key)

        if (pref is ListPreference) {
            val listPref: ListPreference = pref

            pref.value?.let {
                pref.setSummary(listPref.entry)

                if (key.equals("language", true)) {
                    . 
                    . 
                    . 
                }
            }
        }
    }
    
    private fun updateLanguage(languageCode: String) {
        (activity as? LocalizationActivity)?.setLanguage(languageCode)
        .
        .
        .
    }
}