如何让经度，纬度的城市名称的Andr​​oid code [英] how to get longitude,latitude from the city name android code

问题描述

我要转换包含城市名称的文本字段取一文，我想将其转换为经度和纬度。

I want to convert a text taken from a text field which contains the city name, and I want to convert it to longitude and latitude.

这是我做了什么：

String location=city.getText().toString();
            String inputLine = "";
            String result = "";
            location=location.replaceAll(" ", "%20");
            String myUrl="http://maps.google.com/maps/geo?q="+location+"&output=csv";
            try{
             URL url=new URL(myUrl);
             URLConnection urlConnection=url.openConnection();
             BufferedReader in = new BufferedReader(new 
             InputStreamReader(urlConnection.getInputStream()));
              while ((inputLine = in.readLine()) != null) {
              result=inputLine;
              }
               lat = result.substring(6, result.lastIndexOf(","));
               longi = result.substring(result.lastIndexOf(",") + 1);
             }
             catch(Exception e){
             e.printStackTrace();
             }

            //////////////////////////////////
            if (location=="" ) 
            {           
             latitude=loc.getLatitude();
            longitude=loc.getLongitude();
            }
            else 
            {
                latitude=Double.parseDouble(lat);
                longitude=Double.parseDouble(longi);
            }

但code不走else语句

but the code doesn't take the else statement

我改变了网址是：

字符串myUrl =htt​​p://maps.googleapis.com/maps/api/geo$c$c/json?address=+位置+＆放大器，传感器=真;

String myUrl="http://maps.googleapis.com/maps/api/geocode/json?address="+location+"&sensor=true";

和是这种结果：

{
   "results" : [
      {
         "address_components" : [
            {
               "long_name" : "Nablus",
               "short_name" : "Nablus",
               "types" : [ "locality", "political" ]
            }
         ],
         "formatted_address" : "Nablus",
         "geometry" : {
            "location" : {
               "lat" : 32.22504,
               "lng" : 35.260971
            },
            "location_type" : "APPROXIMATE",
            "viewport" : {
               "northeast" : {
                  "lat" : 32.2439165,
                  "lng" : 35.2929858
               },
               "southwest" : {
                  "lat" : 32.20615960000001,
                  "lng" : 35.2289562
               }
            }
         },
         "types" : [ "locality", "political" ]
      }
   ],
   "status" : "OK"
}

我怎么能使用经度和纬度在我的code ??

how could I use latitude and longitude in my code??

推荐答案

目前使用的地理codeR 。它确实pretty的大致相同的地理编码的API。

There is an easier way by using the Geocoder. It does pretty much the same as the Geocoding API.

if(Geocoder.isPresent()){
    try {
        String location = "theNameOfTheLocation";
        Geocoder gc = new Geocoder(this);
        List<Address> addresses= gc.getFromLocationName(location, 5); // get the found Address Objects

        List<LatLng> ll = new ArrayList<LatLng>(addresses.size()); // A list to save the coordinates if they are available
        for(Address a : addresses){
            if(a.hasLatitude() && a.hasLongitude()){
                ll.add(new LatLng(a.getLatitude(), a.getLongitude()));
            }  
        }  
    } catch (IOException e) {
         // handle the exception
    }
}

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