How to add zoom to this code? On touch works great and moves image - android-studio

Question

Is there anyway to use matrix or scale gesture to this code ? I can move image arround x,y but cant zoom in or out. Any advice would be welcome :)
this is my class
class SimpleFloatingWindow constructor(private val context: Context) {
private var windowManager: WindowManager? = null
get() {
if (field == null) field = (context.getSystemService(WINDOW_SERVICE) as WindowManager)
return field
}
private var floatView: View =
LayoutInflater.from(context).inflate(R.layout.layout_floating_window, null)
private lateinit var layoutParams: WindowManager.LayoutParams
private var lastX: Int = 0
private var lastY: Int = 0
private var firstX: Int = 0
private var firstY: Int = 0
private var isShowing = false
private var touchConsumedByMove = false
private val onTouchListener = View.OnTouchListener { view, event ->
val totalDeltaX = lastX - firstX
val totalDeltaY = lastY - firstY
when (event.actionMasked) {
MotionEvent.ACTION_DOWN -> {
lastX = event.rawX.toInt()
lastY = event.rawY.toInt()
firstX = lastX
firstY = lastY
}
MotionEvent.ACTION_UP -> {
view.performClick()
}
MotionEvent.ACTION_MOVE -> {
val deltaX = event.rawX.toInt() - lastX
val deltaY = event.rawY.toInt() - lastY
lastX = event.rawX.toInt()
lastY = event.rawY.toInt()
if (abs(totalDeltaX) >= 5 || abs(totalDeltaY) >= 5) {
if (event.pointerCount == 1) {
layoutParams.x += deltaX
layoutParams.y += deltaY
touchConsumedByMove = true
windowManager?.apply {
updateViewLayout(floatView, layoutParams)
}
} else {
touchConsumedByMove = false
}
} else {
touchConsumedByMove = false
}
}
else -> {
}
}
touchConsumedByMove
}
init {
with(floatView) {
closeImageButton.setOnClickListener { dismiss() }
}
floatView.setOnTouchListener(onTouchListener)
layoutParams = WindowManager.LayoutParams().apply {
format = PixelFormat.TRANSLUCENT
flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
#Suppress("DEPRECATION")
type = when {
Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ->
WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
else -> WindowManager.LayoutParams.TYPE_TOAST
}
gravity = Gravity.CENTER
width = WindowManager.LayoutParams.WRAP_CONTENT
height = WindowManager.LayoutParams.WRAP_CONTENT
}
}