Magic Touch Recycler

onTouchEvent.kt

class ScaleItemOnTouchListener : RecyclerView.OnItemTouchListener {
    
    .......
    
        override fun onTouchEvent(rv: RecyclerView, event: MotionEvent) {

        val childView = rv.findChildViewUnder(event.x, event.y)
        val previousChild = rv.findChildViewUnder(previousX, previousY)
        if (childView != null) {
            when (event.action) {
                MotionEvent.ACTION_DOWN, MotionEvent.ACTION_MOVE -> {
                    if (childView.scaleX != SCALE_UP) {
                        scaleUp(childView)
                    }

                    if (previousChild != null && previousChild != childView) {
                        scaleDown(previousChild)
                    }
                }
                MotionEvent.ACTION_UP, MotionEvent.ACTION_POINTER_UP -> {
                    scaleDown(childView)
                    childView.callOnClick()
                }
            }
            previousX = childView.x
            previousY = childView.y
        } else if (previousChild != null && (event.action == MotionEvent.ACTION_UP
                || event.action == MotionEvent.ACTION_CANCEL)) {
            scaleDown(previousChild)
            previousX = 0f
            previousY = 0f
        }
    }
    
    .......
}