[android] How to calculate distance between two locations using their longitude and latitude value

Here my code I used below code to calculate the distance between two location using their latitude and longitude. It is giving wrong distance. sometimes getting right and sometimes getting irrelevant distance.

We are getting lat1 and lng1 from database.

//getting lat2 and lng2 from GPS as below

public class MyLocationListener implements LocationListener {

  @Override
  public void onLocationChanged(Location loc)
  {
    lat2=loc.getLatitude();
    lng2=loc.getLongitude();
    String Text = "My current location is: " +"Latitud = "+ loc.getLatitude() +"Longitud = " + loc.getLongitude();

    //System.out.println("Lat & Lang form Loc"+Text);
    //Toast.makeText( getApplicationContext(), Text,Toast.LENGTH_SHORT).show();
  }

  @Override
  public void onProviderDisabled(String provider)
  {
  }

  @Override
  public void onProviderEnabled(String provider)
  {
  }

  @Override
  public void onStatusChanged(String provider, int status, Bundle extras)
  {
  }


  //Calculating distance
  double earthRadius = 3958.75;

  double dLat = Math.toRadians(lat1-lat2);
  double dLng = Math.toRadians(lng1-lng2);
  double a = Math.sin(dLat/2) * Math.sin(dLat/2) +
             Math.cos(Math.toRadians(lat2)) * Math.cos(Math.toRadians(lat1)) *
             Math.sin(dLng/2) * Math.sin(dLng/2);
  double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
  double dist = earthRadius * c;

private float distanceFrom_in_Km(float lat1, float lng1, float lat2, float lng2) {

     if (lat1== null || lng1== null || lat2== null || lng2== null) 
     {
                return null;
     }

 double earthRadius = 6371000; //meters
    double dLat = Math.toRadians(lat2-lat1);
    double dLng = Math.toRadians(lng2-lng1);
    double a = Math.sin(dLat/2) * Math.sin(dLat/2) +
               Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) *
               Math.sin(dLng/2) * Math.sin(dLng/2);
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
    float dist = (float) (earthRadius * c);

    return dist;
    }    

If you have two Location Objects Location loc1 and Location loc2 you do

float distance = loc1.distanceTo(loc2);

If you have longitude and latitude values you use the static distanceBetween() function

    float[] results = new float[1];
    Location.distanceBetween(startLatitude, startLongitude,
    endLatitude, endLongitude, results);
    float distance = results[0];

Get KM from lat long

public static float getKmFromLatLong(float lat1, float lng1, float lat2, float lng2){
            Location loc1 = new Location("");
            loc1.setLatitude(lat1);
            loc1.setLongitude(lng1);
            Location loc2 = new Location("");
            loc2.setLatitude(lat2);
            loc2.setLongitude(lng2);
            float distanceInMeters = loc1.distanceTo(loc2);
            return distanceInMeters/1000;
        }

Try This below method code to get the distance in meter between two location, hope it will help for you

 public static double distance(LatLng start, LatLng end){
    try {
        Location location1 = new Location("locationA");
        location1.setLatitude(start.latitude);
        location1.setLongitude(start.longitude);
        Location location2 = new Location("locationB");
        location2.setLatitude(end.latitude);
        location2.setLongitude(end.longitude);
        double distance = location1.distanceTo(location2);
        return distance;
    } catch (Exception e) {

        e.printStackTrace();

    }
    return 0;
}

Try this code.

startPoint.distanceTo(endPoint) function returns the distance between those places in meters.

Location startPoint=new Location("locationA");
startPoint.setLatitude(17.372102);
startPoint.setLongitude(78.484196);

Location endPoint=new Location("locationA");
endPoint.setLatitude(17.375775);
endPoint.setLongitude(78.469218);

double distance=startPoint.distanceTo(endPoint);

here "distance" is our required result in Meters. I hope it will work for android.

public float getMesureLatLang(double lat,double lang) {

    Location loc1 = new Location("");
    loc1.setLatitude(getLatitute());// current latitude
    loc1.setLongitude(getLangitute());//current  Longitude

    Location loc2 = new Location("");
    loc2.setLatitude(lat);
    loc2.setLongitude(lang);

    return loc1.distanceTo(loc2);
 //  return distance(getLatitute(),getLangitute(),lat,lang);
}

There is an android.location.Location.distanceBetween() method which does this quite well.

Android Developer Docs: Location

Why are you writing the code for calculating the distance by yourself?

Check the api's in Location class

You should use Haversine Distance Formulas

Haversine Formulas used to calculate the great distance between two points on the earth.

    public void haversine(double lat1, double lon1, double lat2, double lon2) {
 double Rad = 6372.8; //Earth's Radius In kilometers
            // TODO Auto-generated method stub
            double dLat = Math.toRadians(lat2 - lat1);
            double dLon = Math.toRadians(lon2 - lon1);
            lat1 = Math.toRadians(lat1);
            lat2 = Math.toRadians(lat2);
            double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.sin(dLon / 2) * Math.sin(dLon / 2) * Math.cos(lat1) * Math.cos(lat2);
            double c = 2 * Math.asin(Math.sqrt(a));
            haverdistanceKM = Rad * c;

        }

Use the below method for calculating the distance of two different locations.

public double getKilometers(double lat1, double long1, double lat2, double long2) {
 double PI_RAD = Math.PI / 180.0;
 double phi1 = lat1 * PI_RAD;
 double phi2 = lat2 * PI_RAD;
 double lam1 = long1 * PI_RAD;
 double lam2 = long2 * PI_RAD;

return 6371.01 * acos(sin(phi1) * sin(phi2) + cos(phi1) * cos(phi2) * cos(lam2 - lam1));}

private String getDistanceOnRoad(double latitude, double longitude,
        double prelatitute, double prelongitude) {
    String result_in_kms = "";
    String url = "http://maps.google.com/maps/api/directions/xml?origin="
            + latitude + "," + longitude + "&destination=" + prelatitute
            + "," + prelongitude + "&sensor=false&units=metric";
    String tag[] = { "text" };
    HttpResponse response = null;
    try {
        HttpClient httpClient = new DefaultHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpPost httpPost = new HttpPost(url);
        response = httpClient.execute(httpPost, localContext);
        InputStream is = response.getEntity().getContent();
        DocumentBuilder builder = DocumentBuilderFactory.newInstance()
                .newDocumentBuilder();
        Document doc = builder.parse(is);
        if (doc != null) {
            NodeList nl;
            ArrayList args = new ArrayList();
            for (String s : tag) {
                nl = doc.getElementsByTagName(s);
                if (nl.getLength() > 0) {
                    Node node = nl.item(nl.getLength() - 1);
                    args.add(node.getTextContent());
                } else {
                    args.add(" - ");
                }
            }
            result_in_kms = String.format("%s", args.get(0));
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return result_in_kms;
}

in build.gradle:

compile 'com.google.maps.android:android-maps-utils:0.4'

and then:

public static Double distanceBetween(LatLng point1, LatLng point2) {
    if (point1 == null || point2 == null) {
        return null;
    }

    return SphericalUtil.computeDistanceBetween(point1, point2);
}