Google maps static map of a polyline passing through lakes, river, mountains

Question

My program uses Google Maps routes for web services to find a route between two points. The result is analyzed and stored in a variable.
This variable is then used to compile the URL of a google static map.

Analysis and URLs work correctly. The problem is that the drawn "route" passes through the lake and mountains.

{ String GPS = "-22.978823,-43.233249"; String link = MAPS_BASE_URL + "center=brazil," + GPS + "&markers=color:blue|brazil," + GPS + "&path=color:0xff0000ff" + "%s" + "&zoom=13&size=1024x1024&sensor=false"; String htmlContent = ""; String direction_URL= ""; URL url = null; String parsedStr = null; Scanner scan = null; origin = GPS; destination ="Maracanã"; try { direction_URL = MAPS_DIRECTIONS_URL; direction_URL += URLEncoder.encode(origin, "UTF-8"); direction_URL += "&destination="; direction_URL += URLEncoder.encode(destination, "UTF-8"); direction_URL += "&key=AIzaSyARNFl6ns__p2OEy3uCrZMGem8KW8pXwAI"; }catch(UnsupportedEncodingException e){ Logger.getLogger(Service.class.getName()).log(Level.SEVERE, null, e); } try { url = new URL(direction_URL); } catch (MalformedURLException ex) { Logger.getLogger(AlertService.class.getName()).log(Level.SEVERE, null, ex); } try { scan = new Scanner(url.openStream()); } catch (IOException ex) { Logger.getLogger(AlertService.class.getName()).log(Level.SEVERE, null, ex); } String str = new String(); while (scan.hasNext()) str += scan.nextLine(); scan.close(); parsedStr = parseJson(str); try { InputStream htmlInputStream = AlertService.class.getResourceAsStream("/resources/gapi.html"); BufferedReader htmlReader = new BufferedReader( new InputStreamReader(htmlInputStream)); String locationsContent = ""; String wilcardContent = ""; Scanner strScanner = new Scanner(parsedStr); while (strScanner.hasNextLine()) { locationsContent = strScanner.nextLine() + "\n"; StringTokenizer st = new StringTokenizer(locationsContent, ";"); if (st.countTokens() == 2) wilcardContent += "|" + st.nextToken().trim() + "," + st.nextToken().trim(); } link = link.replaceFirst("%s", wilcardContent); htmlContent = ""; while (htmlReader.ready()) htmlContent += htmlReader.readLine() + "\n"; htmlContent = htmlContent.replaceAll("%s", link); } catch (FileNotFoundException ex) { Logger.getLogger(Service.class.getName()).log(Level.SEVERE, null, ex); } catch (IOException ex) { Logger.getLogger(Service.class.getName()).log(Level.SEVERE, null, ex); } return htmlContent; } 

Analysis Function:

  private String parseJson(String s){ String coordinates = new String (); final JSONObject json = new JSONObject(s); final JSONObject jsonRoute = json.getJSONArray("routes").getJSONObject(0); //Get the leg, only one leg as we don't support waypoints final JSONObject leg = jsonRoute.getJSONArray("legs").getJSONObject(0); //Get the steps for this leg final JSONArray steps = leg.getJSONArray("steps"); //Number of steps for use in for loop final int numSteps = steps.length(); for(int i = 0; i< numSteps; ++i){ final JSONObject step = steps.getJSONObject(i); final JSONObject startLocation = step.getJSONObject("start_location"); final Double startLat = startLocation.getDouble("lat"); final Double startlng = startLocation.getDouble("lng"); final JSONObject endLocation = step.getJSONObject("end_location"); final Double endtLat = endLocation.getDouble("lat"); final Double endtlng = endLocation.getDouble("lng"); coordinates = coordinates.concat(" "); coordinates = coordinates.concat(startLat.toString()); coordinates = coordinates.concat(";" + " "); coordinates = coordinates.concat(startlng.toString()); coordinates = coordinates.concat("\n"); coordinates = coordinates.concat(" "); coordinates = coordinates.concat(endtLat.toString()); coordinates = coordinates.concat(";" + " "); coordinates = coordinates.concat(endtlng.toString()); coordinates = coordinates.concat("\n"); } return coordinates; } 

Json answer:

https://maps.googleapis.com/maps/api/directions/json?origin=-22.978823,-43.233249&destination=Maracan%C3%A2&key=AIzaSyARNFl6ns__p2OEy3uCrZMGem8KW8pXwAI

The final URL is as follows:

http: //maps.google.com/maps/api/staticmap? center = brazil, -22.978823, -43.233249 & markers = color: blue | brazil, -22.978823, -43.233249 & path = color: 0xff0000ff | -22.9783362, -43.2336781 | -22.9772355, -43.23076390000001 | -22.9772355, -43.23076390000001 | -22.9789792, -43.2300162 | -22.9789792, -43.2300162 | -22.9790772, -43.23036 | -22.9790772, -43.23036 | -22.9786979, -43.22698949999999 | -22.9786979, -43.22698949999999 | -22.9771399 , -43.2196208 | -22.9771399, -43.2196208 | -22.9624962, -43.20396840000001 | -22.9624962, -43.20396840000001 | -22.9583858, -43.2043807 | -22.9583858, -43.2043807 | -22.93445896, -43.2043807 | -22.93445896, -43.2043807 | -22.93445964, -43.2043807 | 43.2096873 | -22.9333061 | -43.2096873 | -22.913577 | -22.9114561, -43.2254838 | -22.9135546, -43.2276606 & zoom = 13 & size = 1024x1024 & sensor = false

Answer 1

You need to include the path of the polyline between each step of the beginning and the end points (this is an encoded polyline).

From the response web service response :

  "steps" : [ { "distance" : { "text" : "0.3 km", "value" : 335 }, "duration" : { "text" : "1 min", "value" : 52 }, "end_location" : { "lat" : -22.9772355, "lng" : -43.23076390000001 }, "html_instructions" : "Head \u003cb\u003enortheast\u003c/b\u003e on \u003cb\u003eR. Marquês de São Vicente\u003c/b\u003e", "polyline" : { "points" : "r}fkCna{ fGyBaDMSMSOUMUCMAOOgAEe@Co @ ?o@ ?YAWEk@ ?G" }, "start_location" : { "lat" : -22.9783362, "lng" : -43.2336781 }, "travel_mode" : "DRIVING" }, // ... 

Includes all polyline steps (and coding polyline) for me

jsfiddle creating a static map url from web service response

Answer 2

I figured out how to solve it in java.I adapted the geocozip user javascript. In my case, since no waypoints are covered with bone, I just need one foot. So my parsing function got the following:

  List<LatLng> path = new ArrayList(); for(int j = 0; j< numSteps; ++j){ final JSONObject step = steps.getJSONObject(j); final JSONObject polyline = step.getJSONObject("polyline"); final String polylinePoint = polyline.getString("points"); List<LatLng> coordinates = decodePath(polylinePoint); for( int k = 0; k < coordinates.size(); ++k){ path.add(coordinates.get(k)); } } 

It is also necessary to transcode and then put the URL format in a readable format.

 String newPath = path.createPolyLine(encodedPath); String locationsContent=""; locationsContent = URLEncoder.encode(newPath, "UTF-8") .replaceAll("\\%40", "@") .replaceAll("\\+", "%20") .replaceAll("\\%21", "!") .replaceAll("\\%27", "'") .replaceAll("\\%28", "(") .replaceAll("\\%29", ")");