I would like to find the distance in km between two markers how can I do?

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I would like to find the distance in km between two markers how can I do?

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#1 by (2 votes)

2

I have two markers in this code and I want to find the distance in kilometers between them.

private void setUpMap() {
    Database_Congregacao database_congregacao = new Database_Congregacao(this);
    int tamanho = 0;
    int size = 0;
    tamanho = database_congregacao.Buscar_Ultimas_Coordenadas().size() - 1;
    size = tamanho;

    Float lt = Float.parseFloat(latitude);
    Float lon = Float.parseFloat(longitude);
    String nome_congregacao = Activity_informacao_congregacao.this.getIntent().getExtras().getString("nome_congregacao");
    //Marker do LOcal do evento
    Marker marker = mMap.addMarker(new MarkerOptions().position(new LatLng(lt,lon)).title(nome_congregacao).icon(BitmapDescriptorFactory.fromResource(R.drawable.marker3)));

    //Marker da localizacao do usuario
    Marker marker2 = mMap.addMarker(new MarkerOptions().position(new LatLng(database_congregacao.Buscar_Ultimas_Coordenadas().get(size).getLatitude(),database_congregacao.Buscar_Ultimas_Coordenadas().get(size).getLongitude())).title("Minha Localização").icon(BitmapDescriptorFactory.fromResource(R.drawable.marker5)));

    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lt, lon), 12));
    marker.showInfoWindow();
    marker2.showInfoWindow();
}

java android google-maps

asked by anonymous 16.05.2015 / 00:07

1 answer

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score 2 · Answer 1

As you only ask for the distance between two points, you can use distanceTo of class Location . According to the documentation, it returns the approximate distance in meters between the two points.

So, to calculate in KM, something like this will help you:

public double calculaDistanciaEmKM(double lat1, double lon1, double lat2, double lon2) { 
    final Location start = new Location("Start Point"); 
    start.setLatitude(lat1); 
    start.setLongitude(lon1);

    final Location finish = new Location("Finish Point"); 
    finish.setLatitude(lat2); 
    finish.setLongitude(lon2); 
    final float distance = start.distanceTo(finish);

    return distance / 1000;
}

For detailed information on distance, traffic, etc., consider looking at the Directions API.