Android google map Find the distance between

Question

I have successfully created a google map. I can check mylocation, and I wrote code that can add a point in the google map (touch listener) and draw a line between the starting location and the point. and now I want to check the distance. I don’t know how I can googled this one example, but this code does not work correctly? I always have one distance this is my code, if anyone knows the solution, please help me thanks

public class GPS extends Activity implements OnMyLocationChangeListener, OnMapClickListener { final int RQS_GooglePlayServices = 1; private GoogleMap myMap; Circle myCircle; TextView tvLocInfo, GPSLocation; LatLng latLng; boolean markerClicked; ArrayList<LatLng> markerPoints; double Startlatitude, Startlongitude, Endlatitude, Endlongitude; public Button gpssize; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.gps); markerPoints = new ArrayList<LatLng>(); gpssize = (Button) findViewById(R.id.gpssize); tvLocInfo = (TextView) findViewById(R.id.GpsTxt); GPSLocation = (TextView) findViewById(R.id.GPSLocation); FragmentManager myFragmentManager = getFragmentManager(); MapFragment myMapFragment = (MapFragment) myFragmentManager .findFragmentById(R.id.GpsMap); myMap = myMapFragment.getMap(); myMap.getUiSettings().setZoomControlsEnabled(true); myMap.getUiSettings().setCompassEnabled(true); myMap.getUiSettings().setMyLocationButtonEnabled(true); myMap.setMyLocationEnabled(true); myMap.setOnMyLocationChangeListener(this); gpssize.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { double distance; Location locationA = new Location(""); locationA.setLatitude(Startlatitude); locationA.setLongitude(Startlongitude); Location locationB = new Location(""); locationB.setLatitude(Endlatitude); locationB.setLongitude(Endlongitude); distance = locationA.distanceTo(locationB) / 1000; Toast.makeText(getApplicationContext(), "" + distance, Toast.LENGTH_LONG).show(); } }); myMap.setOnMapClickListener(this); myMap.setTrafficEnabled(true); markerClicked = false; } @Override protected void onResume() { super.onResume(); int resultCode = GooglePlayServicesUtil .isGooglePlayServicesAvailable(getApplicationContext()); if (resultCode == ConnectionResult.SUCCESS) { Toast.makeText(getApplicationContext(), "isGooglePlayServicesAvailable SUCCESS", Toast.LENGTH_LONG) .show(); } else { GooglePlayServicesUtil.getErrorDialog(resultCode, this, RQS_GooglePlayServices); } } @Override public void onMyLocationChange(Location location) { Startlatitude = location.getLatitude(); Startlongitude = location.getLongitude(); latLng = new LatLng(Startlatitude, Startlongitude); myMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); GPSLocation.setText(Startlatitude + " " + Startlongitude); // myMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); LatLng locLatLng = new LatLng(location.getLatitude(), location.getLongitude()); double accuracy = location.getAccuracy(); if (myCircle == null) { CircleOptions circleOptions = new CircleOptions().center(locLatLng) .radius(accuracy) .fillColor(Color.RED).strokeColor(Color.BLACK).strokeWidth(5); myCircle = myMap.addCircle(circleOptions); } else { myCircle.setCenter(locLatLng); myCircle.setRadius(accuracy); } myMap.animateCamera(CameraUpdateFactory.zoomTo(15)); } private String getDirectionsUrl(LatLng origin, LatLng dest) { String str_origin = "origin=" + Startlatitude + "," + Startlongitude; String str_dest = "destination=" + dest.latitude + "," + dest.longitude; String sensor = "sensor=false"; String parameters = str_origin + "&" + str_dest + "&" + sensor; String output = "json"; String url = "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters; return url; } /** A method to download json data from url */ private String downloadUrl(String strUrl) throws IOException { String data = ""; InputStream iStream = null; HttpURLConnection urlConnection = null; try { URL url = new URL(strUrl); urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.connect(); iStream = urlConnection.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader( iStream)); StringBuffer sb = new StringBuffer(); String line = ""; while ((line = br.readLine()) != null) { sb.append(line); } data = sb.toString(); br.close(); } catch (Exception e) { Log.d("Exception while downloading url", e.toString()); } finally { iStream.close(); urlConnection.disconnect(); } return data; } private class DownloadTask extends AsyncTask<String, Void, String> { @Override protected String doInBackground(String... url) { String data = ""; try { data = downloadUrl(url[0]); } catch (Exception e) { Log.d("Background Task", e.toString()); } return data; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); ParserTask parserTask = new ParserTask(); parserTask.execute(result); } } private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String, String>>>> { @Override protected List<List<HashMap<String, String>>> doInBackground( String... jsonData) { JSONObject jObject; List<List<HashMap<String, String>>> routes = null; try { jObject = new JSONObject(jsonData[0]); DirectionsJSONParser parser = new DirectionsJSONParser(); routes = parser.parse(jObject); } catch (Exception e) { e.printStackTrace(); } return routes; } @Override protected void onPostExecute(List<List<HashMap<String, String>>> result) { ArrayList<LatLng> points = null; PolylineOptions lineOptions = null; MarkerOptions markerOptions = new MarkerOptions(); for (int i = 0; i < result.size(); i++) { points = new ArrayList<LatLng>(); lineOptions = new PolylineOptions(); List<HashMap<String, String>> path = result.get(i); for (int j = 0; j < path.size(); j++) { HashMap<String, String> point = path.get(j); double lat = Double.parseDouble(point.get("lat")); double lng = Double.parseDouble(point.get("lng")); tvLocInfo.setText(lat + " " + lng); LatLng position = new LatLng(lat, lng); points.add(position); } lineOptions.addAll(points); lineOptions.width(7); lineOptions.geodesic(true); lineOptions.color(getResources().getColor(R.color.mapColor)); } myMap.addPolyline(lineOptions); } } @Override public void onMapClick(LatLng point) { if (markerPoints.size() > 0) { markerPoints.clear(); myMap.clear(); } markerPoints.add(point); MarkerOptions options = new MarkerOptions(); options.position(point); if (markerPoints.size() == 1) { options.icon(BitmapDescriptorFactory .defaultMarker(BitmapDescriptorFactory.HUE_GREEN)); } myMap.addMarker(options); if (markerPoints.size() >= 1) { LatLng dest = markerPoints.get(0); LatLng origin = new LatLng(Endlatitude, Endlongitude); String url = getDirectionsUrl(origin, dest); DownloadTask downloadTask = new DownloadTask(); downloadTask.execute(url); } } 

}

Answer 1

Try this method to get the Distance between LatLng Points:

 float[] distances = new float[1]; Location.distanceBetween(locationA.latitude, locationA.longitude, locationB.latitude, locationB.longitude, distances); System.out.println("Distance: " + distances[0]);