Android Zoomable endless rings

I am trying to create an endless zoomable rings, something like this -

Whenever a user pinch zooms, new small circle at the center is created and the outer circle grows bigger. I am using pinch zoom in relative layout to create the following effect, but not able to achieve it properly. I have created a repo for this, let me know if you can help https://github.com/rohankandwal/zoomable-growing-circles

Update:- Changed dispatchDraw method on the mentioned stackoverflow answer -

protected void dispatchDraw(Canvas canvas) {
    Paint myPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    myPaint.setStyle(Paint.Style.STROKE);
    int strokeWidth = 4;  // or whatever
    myPaint.setStrokeWidth(strokeWidth);
    myPaint.setColor(0xffff0000);   //color.RED
    float radius = (float) (0.5 * (width + height) * 2.5);
    for (int i = 1; i <= 51; i=i+10) {
      canvas.drawCircle(canvas.getWidth() / 2, canvas.getWidth() / 2, (radius) + mScaleFactor + i,
        myPaint);
    }
    canvas.save();
    super.dispatchDraw(canvas);
    canvas.restore();
  }

This code allows circle to grow -

Original image without pinch zoom

Image when pinch zoomed

As you can see, zoom is working, but don't know how to create new circles when zoomed at certain level.

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