fun onPlay(view: View){
         var play = findViewById(R.id.play) as Button
         play.isClickable=false
         play.visibility=view.INVISIBLE
}

fun onPlay(view: View){
     var play = findViewById(R.id.play) as Button
     play.isClickable=false
     play.visibility= View.INVISIBLE // v letter should be capital
}

appCompatActivity!!.findViewById<LinearLayout>(R.id.layoutsearch)?.visibility =View.GONE