How do I calculate the center of a polygon in Google Maps Android API v2?

Below code I am using to find the center point of the polygon. its working for me too

private LatLng getPolygonCenterPoint(ArrayList<LatLng> polygonPointsList){
        LatLng centerLatLng = null;
        Builder builder = new LatLngBounds.Builder(); 
        for(int i = 0 ; i < polygonPointsList.size() ; i++) 
        {          
            builder.include(polygonPointsList.get(i));
        }
        LatLngBounds bounds = builder.build();
        centerLatLng =  bounds.getCenter();

        return centerLatLng;
    }

Below is the code which I am using now to find the center of polygon:-

public static double[] centroid(List<PolyPoints> points) {
        double[] centroid = { 0.0, 0.0 };

        for (int i = 0; i < points.size(); i++) {
            centroid[0] += points.get(i).getLatitude();
            centroid[1] += points.get(i).getLongitude();
        }

        int totalPoints = points.size();
        centroid[0] = centroid[0] / totalPoints;
        centroid[1] = centroid[1] / totalPoints;

        return centroid;
    }

private static LatLng getCenterOfPolygon(List<LatLng> latLngList) {
        double[] centroid = {0.0, 0.0};
        for (int i = 0; i < latLngList.size(); i++) {
            centroid[0] += latLngList.get(i).latitude;
            centroid[1] += latLngList.get(i).longitude;
        }
        int totalPoints = latLngList.size();
        return new LatLng(centroid[0] / totalPoints, centroid[1] / totalPoints);
    }