Updated code for touch event listener

MainActivity.kt

arSceneView.scene.setOnTouchListener {
    hitTestResult : HitTestResult?, motionEvent : MotionEvent? ->
    gestureDetectorCompat!!.onTouchEvent(motionEvent)
    when (gestureDetector.gestureType) {
        GestureDetector.GestureType.SINGLE_TAP -> {
            if (hitTestResult!!.node == null) {
                Toast.makeText(this, "SINGLE TAP performed", Toast.LENGTH_SHORT).show()
            }
            else {
                Toast.makeText(this, "SINGLE TAP performed on a node", Toast.LENGTH_SHORT).show()
            }
        }
        GestureDetector.GestureType.DOUBLE_TAP -> {
            if (hitTestResult!!.node == null) {
                Toast.makeText(this, "DOUBLE TAP performed", Toast.LENGTH_SHORT).show()
            }
            else {
                Toast.makeText(this, "DOUBLE TAP performed on a node", Toast.LENGTH_SHORT).show()
            }
        }
        GestureDetector.GestureType.LONG_PRESS -> {
            if (hitTestResult!!.node == null) {
                Toast.makeText(this, "LONG PRESS performed", Toast.LENGTH_SHORT).show()
            }
            else {
                Toast.makeText(this, "LONG PRESS performed on a node", Toast.LENGTH_SHORT).show()
            }
        }
        else -> { }
    }
    gestureDetector.resetGestureType()
    true
}