private static GoogleReverseGeocodeAddressComponent TryGetComponent(GoogleReverseGeocodeResult result, string type)
{
return(result
.Results[0]
.Address_Components
.Where(x => x.Types.Any(t => t.Equals(type)))
.FirstOrDefault());
}
public static Location ReverseGeocode(Position position)
{
UriBuilder uri = new UriBuilder("https://maps.googleapis.com/maps/api/geocode/json");
uri.Query = string.Format(
"latlng={0},{1}&key={2}",
position.Latitude,
position.Longitude,
WewyConstants.GOOGLE_MAPS_API_KEY);
WebRequest request = WebRequest.Create(uri.Uri);
// Get the response.
WebResponse response = request.GetResponse();
// Display the status.
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
Stream dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
// Display the content.
Console.WriteLine(responseFromServer);
// Clean up the streams and the response.
reader.Close();
response.Close();
JavaScriptSerializer ser = new JavaScriptSerializer();
GoogleReverseGeocodeResult result = ser.Deserialize <GoogleReverseGeocodeResult>(responseFromServer);
if (result.Status == null || !result.Status.Equals("OK"))
{
// Something went wrong. TODO: Log it somewhere!
// Just return null and we won't store the city name but everything else will work.
return(null);
}
if (result.Results.Count == 0 ||
result.Results[0].Address_Components == null)
{
// TODO: Also log somewhere.
return(null);
}
GoogleReverseGeocodeAddressComponent cityComponent = TryGetComponent(result, "locality");;
if (cityComponent == null)
{
cityComponent = TryGetComponent(result, "administrative_area_level_3");
}
if (cityComponent == null)
{
cityComponent = TryGetComponent(result, "administrative_area_level_2");
}
if (cityComponent == null)
{
cityComponent = TryGetComponent(result, "administrative_area_level_1");
}
string city = null;
if (cityComponent != null)
{
city = cityComponent.Long_Name;
}
GoogleReverseGeocodeAddressComponent countryComponent = TryGetComponent(result, "country");
string country = null;
if (countryComponent != null)
{
country = countryComponent.Long_Name;
}
if (string.IsNullOrEmpty(country) && string.IsNullOrEmpty(city))
{
// Don't bother with constructing location object.
return(null);
}
return(new Location()
{
City = city,
Country = country
});
}
