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Simple example of DraggableTextView in Android | Kotlin

Hello All, By using simple onTouch event we make an DraggableTextView widget.
Here is the code sample for you. 
override fun onTouch(v: View?, event: MotionEvent?): Boolean {
    val x = event?.rawX?.toInt()!!
    val y = event.rawY.toInt()

    when (event.action) {
        MotionEvent.ACTION_DOWN -> {
            val layoutParams = layoutParams as ConstraintLayout.LayoutParams
            xDelta = x - layoutParams.leftMargin
            yDelta = y - layoutParams.topMargin
            rect.set(0, 0, width, height)
            isDragging = true
        }
        MotionEvent.ACTION_MOVE -> {
            val layoutParams = layoutParams as ConstraintLayout.LayoutParams
            layoutParams.leftMargin = x - xDelta
            layoutParams.topMargin = y - yDelta
            setLayoutParams(layoutParams)
        }
        MotionEvent.ACTION_UP -> {
            isDragging = false
        }
    }
    invalidate()
    return true
}

Here is the full video tutorial.

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