How to get speed in android app using Location or accelerometer or some other way

Question

I am working on app and try to get the speed and distance travelled by the user. I have used Google Play services location class to get the speed but it always returns me 0.

Answer 1

public static double getSpeed(Location currentLocation, Location oldLocation)
{
    double newLat = currentLocation.getLatitude();
    double newLon = currentLocation.getLongitude();

    double oldLat = oldLocation.getLatitude();
    double oldLon = oldLocation.getLongitude();

    if(currentLocation.hasSpeed()){
        return currentLocation.getSpeed();
    } else {
        double radius = 6371000;
        double dLat = Math.toRadians(newLat-oldLat);
        double dLon = Math.toRadians(newLon-oldLon);
        double a = Math.sin(dLat/2) * Math.sin(dLat/2) +
                Math.cos(Math.toRadians(newLat)) * Math.cos(Math.toRadians(oldLat)) *
                        Math.sin(dLon/2) * Math.sin(dLon/2);
        double c = 2 * Math.asin(Math.sqrt(a));
        double distance =  Math.round(radius * c);

        double timeDifferent = currentLocation.getTime() - oldLocation.getTime();
        return distance/timeDifferent;
    }
}