Calculate distance traveled on android

Question

I developed an application that one of the features it has is to calculate the distance traveled by the user, for this I use a Service and the API LocationListener to request user location updates. In the method onLocationChanged I calculate the distance covered and saved in the local bank. What is happening is that sometimes this account of the distance covered is giving well above the estimated.

@Override
public void onLocationChanged(Location location) {
    if (location != null) {

        if (startCounter) {

            if (!isFirstLocationFinded) {
                latlon = new double[]{location.getLatitude(), location.getLongitude()};
                isFirstLocationFinded = true;
            } else {

                double distance = calculateDistance(location);

                    //save in database
                    TrackingRace track = database.find(TrackingRace.class, ID);
                    if (track == null) {
                        TrackingRace trackingRace = new TrackingRace(ID, distance);
                        database.save(trackingRace);
                    } else {
                        double oldDistance = track.distance;
                        double totalDistance = distance + oldDistance;

                        TrackingRace trackingRace = new TrackingRace(ID, totalDistance);
                        database.update(trackingRace);
                    }

                }
            }
        }
    }
}

private double calculateDistance(Location location) {

    double[] latlonNew = new double[]{location.getLatitude(),location.getLongitude()};

    double distance = 0;

    Location locationA = new Location("point A");
    locationA.setLatitude(latlon[0]);
    locationA.setLongitude(latlon[1]);

    Location locationB = new Location("point B");
    locationB.setLatitude(latlonNew[0]);
    locationB.setLongitude(latlonNew[1]);

    distance = locationA.distanceTo(locationB);

    latlon = latlonNew.clone();

    return distance;

}