Java 谷歌地图通过湖泊、河流、山脉的静态地图多段线

我的程序使用google maps directions for web服务查找两点之间的路线。结果被解析并存储在变量中。
然后使用此变量组成google静态地图URL

解析和URL工作正常。问题是绘制的“路线”穿过湖泊和山脉

{
    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;
}

解析函数：

 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;     
}

私有字符串解析JSON（字符串s）{
字符串坐标=新字符串（）；
最终JSONObject json=新的JSONObject；
最终JSONObject jsonRoute=json.getJSONArray（“路由”）.getJSONObject（0）；
//获取航段，只有一个航段，因为我们不支持航路点
最终JSONObject leg=jsonRoute.getJSONArray（“legs”）.getJSONObject（0）；
//准备好这条腿的台阶
最终JSONArray步骤=leg.getJSONArray（“步骤”）；
//在for循环中使用的步骤数
final int numSteps=steps.length（）；
对于（int i=0；i

Json响应：

最终URL如下所示：

---

您需要在每个步骤的起点和终点之间包含多段线路径（它是一条编码的多段线）

从：

---

我找到了用java解决这个问题的方法。我改编了用户geocozip javascript代码。在我的情况下，由于没有提供航路点，我只需要一条腿。因此，我的解析函数得到如下结果：

  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));
    }
 } 

---

生成的URL看起来有什么问题？该路由来自哪里？看起来它来自方向服务，但不包括所有的点（只包括每个分支的起点和终点）。@geocodezip我添加了静态地图URL。此外，路线确实来自方向服务。它来自的方向请求/响应是什么样子的？在我看来（正如我在第二次评论中所说的），你只是在回复中包含了一些要点。您可能也想对路径进行编码。@geocodezip您能给我一个如何编辑它的示例吗？您能给我一个如何编辑它的示例吗？为我的答案添加了解析方向服务响应的示例

  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));
    }
 } 

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", ")");