Как получить идентификатор из builder.setmessage для kotlin

Question

Как передать builder.setMessage("abc") данные в txtAnswer textview

builder.setMessage("abc")

builder.setNeutralButton("PLAY") { dialog, id ->

            val toSpeak = txtAnswer.toString()
            if (toSpeak == ""){
                //if there is no text in edit text
                Toast.makeText(this, "No input", Toast.LENGTH_SHORT).show()
            }
            else{
                //if there is text in edit text
                Toast.makeText(this, toSpeak, Toast.LENGTH_SHORT).show()
                mTTS.speak(toSpeak, TextToSpeech.QUEUE_FLUSH, null)
            }
        }