gistfile1.kt

var lastY = 0f
editText.setOnTouchListener { v, event ->
    v.parent.requestDisallowInterceptTouchEvent(true)
    when (event.actionMasked) {
        MotionEvent.ACTION_DOWN -> {
            // store initial y position
            lastY = event.y
        }
        MotionEvent.ACTION_MOVE -> {
            val deltaY = event.y - lastY
            val scrollDirection = if (deltaY < 0) 1 else -1
            val canScrollFurther = v.canScrollVertically(scrollDirection)
            if (canScrollFurther.not()) {
                v.parent.requestDisallowInterceptTouchEvent(false)
            }
            lastY = event.y
        }
        MotionEvent.ACTION_UP -> {
            v.parent.requestDisallowInterceptTouchEvent(false)
        }
    }
    false
}