code: private void drawRipple(Canvas canvas) {
  		canvas.save();
  		canvas.clipPath(getCircleClipPath(), Region.Op.INTERSECT);
  		TouchPoint point = getActionButton().getTouchPoint();
  		canvas.drawCircle(point.getLastX(), point.getLastY(), currentRadius, getPreparedPaint());
  		canvas.restore();
  	}
docs: Draws the single frame of the Ripple Effect depending on Ripple Effect
  {@link #currentRadius}
  
  @param canvas canvas, which the Ripple Effect is drawing on