How to change spinner ArrayList options to buttons? [KOTLIN]

Question

I am new in android and kotlin. I want to change the Arraylist options that is in an spinner to buttons, I am talking about language options that is in spinner, but I don't want to be in spinner. there was nothing related article that shows something like that, I tried to change the spinner to buttons but it was showing error and App crashed! I hope my question be clear to you.

1- this is my LanguageActivity.kt :

class LanguageActivity : AppCompatActivity() {
private lateinit var databinding: ActivityLanguageBinding
private lateinit var locale: Locale
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    databinding = DataBindingUtil.setContentView(this,R.layout.activity_language)
    val languageList = ArrayList<String>()
    languageList.add("Select")
    languageList.add("English")
    languageList.add("Persian")
    languageList.add("Pashto")
    val adapter = ArrayAdapter(this, 
androidx.appcompat.R.layout.support_simple_spinner_dropdown_item, languageList)
    databinding.sLanguage.adapter = adapter
    databinding.sLanguage.onItemSelectedListener = object : 
AdapterView.OnItemSelectedListener{
        override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: 
Long) {
            when(position){
                0 -> {
                }
                1 -> setLocale("en")
                2 -> setLocale("fa")
                3 -> setLocale("ps")
            }
        }
        override fun onNothingSelected(parent: AdapterView<*>?) {
        }
    }
}
fun setLocale (languageName: String){
    locale = Locale(languageName)
    val res = resources
    val dm = res.displayMetrics
    val conf = res.configuration
    conf.locale = locale
    res.updateConfiguration(conf,dm)
    val refresh = Intent(this, LanguageActivity::class.java)
    startActivity(refresh)
}
}

2- and this is the activity_language.xml :

<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <Spinner
        android:id="@+id/sLanguage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/app_name"/>
</LinearLayout>
</layout>

thank you for helping me. take care.