addPolyline

private void addPolyline() {
        ArrayList<Location> locationList = locationService.locationList;

        if (locationList.size() == 2) {
            Location fromLocation = locationList.get(0);
            Location toLocation = locationList.get(1);

            LatLng from = new LatLng(((fromLocation.getLatitude())),
                    ((fromLocation.getLongitude())));

            LatLng to = new LatLng(((toLocation.getLatitude())),
                    ((toLocation.getLongitude())));

            this.runningPathPolyline = map.addPolyline(new PolylineOptions()
                    .add(from, to)
                    .width(polylineWidth).color(Color.parseColor("#801B60FE")).geodesic(true));

        } else if (locationList.size() > 2) {
            Location toLocation = locationList.get(locationList.size() - 1);
            LatLng to = new LatLng(((toLocation.getLatitude())),
                    ((toLocation.getLongitude())));

            List<LatLng> points = runningPathPolyline.getPoints();
            points.add(to);

            runningPathPolyline.setPoints(points);
        }
    }