kotolin 文字列の連結

fun changeTextView(view: View){
        var calendar = Calendar.getInstance()
        val hour = calendar.get(Calendar.HOUR_OF_DAY)
        val minute = calendar.get(Calendar.MINUTE)

        messageTextView.text = "Hello android!"
        textView.text = "時間 ${hour.toString()}:${minute.toString()}"
    }