Android View Dragging

drag.java

 private float dX;
 private float dY;

    @OnTouch(R.id.corner_point_top_left)  
    boolean onPointTouch(View cornerPoint, MotionEvent event) {
        switch (event.getAction()) {

            case MotionEvent.ACTION_DOWN:

                dX = cornerPoint.getX() - event.getRawX();
                dY = cornerPoint.getY() - event.getRawY();
                return true;

            case MotionEvent.ACTION_MOVE:
                cornerPoint.animate()
                        .x(event.getRawX() + dX)
                        .y(event.getRawY() + dY)
                        .setDuration(0)
                        .start();

                return true;

            default:
                return false;
        }
    }