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Convert MatOfPoint2f to MatOfPoint

I'm working in an opencv project for android. I need to convert a variable from MatOfPoint2f to MatOfPoint. As follows is the relevant part of my code: approx is of type MatOfPoint2f and I need to convert it because drawContours use type ArrayList<matofpoint>.

Imgproc.approxPolyDP(newMtx, approx, 0.02*peri, true);
approxMatOfPoint = (MatOfPoint) approx; // to convert
ArrayList<MatOfPoint> p = new ArrayList<>();
Imgproc.drawContours(img, p, 0, new Scalar(0,255,0), 2);