public class DrawingView extends View {

   /** Last saved X-coordinate */
    private float pX;
    /** Last saved Y-coordinate*/
    private float pY;

    private DrawingViewInterface mInterface;

    public void setViewListener(DrawingViewInterface interface1) {
        mInterface = interface1;
    }

        @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action = event.getAction();


        switch (action) {
            case MotionEvent.ACTION_DOWN:
                path.moveTo(event.getX(), event.getY());
                pX = event.getX();
                pY = event.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                path.quadTo(pX, pY, event.getX(), event.getY());
                pX = event.getX();
                pY = event.getY();


                break;
            case MotionEvent.ACTION_UP:
                cacheCanvas.drawPath(path, paint);
                path.reset();

                mInterface.onActionFinished(pX, pY);
                break;
        }


        invalidate();

        return true;
    }

}