反向地理编码不起作用

Question

我正在编写一个需要找到当前位置的应用程序。该代码正确返回纬度和经度，但不返回真实地址（反向地理编码） 可能有什么问题。 有人请帮忙，我是安卓新手。 我正在使用 android 4.0 的模拟器上进行测试 updateWithNewLocation() 从 onLocationChanged(Location loc) 方法调用

         void updateWithNewLocation(Location location)
          {
                    if (location != null) 
                    {
                            double lat = 29.00;//location.getLatitude();
                            double lng = 77.0;//location.getLongitude();
                            longitudeLattitudeString="Lattitude :"+lat+" Longitude :"+lng;


                            Geocoder gc = new Geocoder(this, Locale.getDefault());

                            try 
                            {
                                    List<Address> addresses = gc.getFromLocation(lat, lng, 1);
                                    StringBuilder sb = new StringBuilder();
                                    //Toast.makeText(this, "Problem1", 2000).show();
                                    if (addresses.size() > 0)
                                    {
                                            Address address = addresses.get(0);
                                            for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
                                                sb.append(address.getAddressLine(i)).append("\n");
                                            sb.append(address.getLocality()).append("\n");
                                            Toast.makeText(this, "Problem2", 2000).show();
                                            sb.append(address.getPostalCode()).append("\n");
                                            sb.append(address.getCountryName());
                                    }
                                    else
                                    {
                                        addressString="  No Location";
                                        //Toast.makeText(this, "Problem3", 2000).show();
                                    }
                                    addressString = sb.toString();
                            } 
                            catch (IOException e) 
                            {
                                //Toast.makeText(thisContext, "Problem : InCatch", 2000).show();
                            }
                    }


                    else 
                    {
                            longitudeLattitudeString = "No location found";    

                    }




            }

Answer 1

public static String getUserLocation(String lat, String lon) {
        String userlocation = null;
        String readUserFeed = readUserLocationFeed(lat.trim() + ","+ lon.trim());
        try {
            JSONObject Strjson = new JSONObject(readUserFeed);
            JSONArray jsonArray = new JSONArray(Strjson.getString("results"));
            userlocation = jsonArray.getJSONObject(1)
                    .getString("formatted_address").toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        Log.i("User Location ", userlocation);
        return userlocation;
    }

    public static String readUserLocationFeed(String address) {
        StringBuilder builder = new StringBuilder();
        HttpClient client = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet("http://maps.google.com/maps/api/geocode/json?latlng="+ address + "&sensor=false");
        try {
            HttpResponse response = client.execute(httpGet);
            StatusLine statusLine = response.getStatusLine();
            int statusCode = statusLine.getStatusCode();
            if (statusCode == 200) {
                HttpEntity entity = response.getEntity();
                InputStream content = entity.getContent();
                BufferedReader reader = new BufferedReader(new InputStreamReader(content));
                String line;
                while ((line = reader.readLine()) != null) {
                    builder.append(line);
                }
            } else {
                Log.e(ReverseGeocode.class.toString(), "Failed to download file");
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return builder.toString();
    }

Answer 2

反向地理编码不适用于模拟器，请在设备上进行测试。