Custom URLSpan don't trigger onClick event, using kotlin

Question

I have this layout:

<TextView
    android:clickable="true"
    android:focusable="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/textView" />

And this code to implement and set my customized URLSpan as the textView text

val urlSpan=object:URLSpan("http://10.0.2.2/feed.xml") {
    override fun onClick(widget: View?) {
        longToast("link was clicked!")
    }
}
val spannableString=SpannableString("this is a spannable link")
spannableString.setSpan(urlSpan, 10, 19, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
textView.text = spannableString

But the onClick event of my customized URLSpan never triggers :( I've searched and nothing seems to work.

I've read this: android custom URLSpan not working and other threads but it was in vain.