Android Studio AlertDialog with HTML Link

MyDialogFragment.kt

class MyDialogFragment : DialogFragment() {

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val html = "<p style=\"color:blue;\">テキストを入力します。</p>" +
                "<p><ul><li>A</li><li>B</li><li>C</li></ul></p>" +
                "<p>Google検索は<a href=\"http://google.com\">こちら</a></p>"

        val dialog = activity?.let {
            AlertDialog.Builder(it)
                .setTitle("タイトル")
                .setMessage(HtmlCompat.fromHtml(html, HtmlCompat.FROM_HTML_MODE_LEGACY))
                .setPositiveButton("OK") { _, _ -> }
                .create()
        }
        return dialog ?: throw IllegalStateException("アクティビティがNullです。")
    }

    override fun onStart() {
        super.onStart()
        dialog?.findViewById<TextView>(android.R.id.message)?.movementMethod = LinkMovementMethod.getInstance()
    }
}