reverseGeocodeLatLng method

void reverseGeocodeLatLng(LatLng latLng)

This method gets the human readable name of the location. Mostly appears to be the road name and the locality.

Implementation

void reverseGeocodeLatLng(LatLng latLng) async {
  try {
    final url = Uri.parse("https://maps.googleapis.com/maps/api/geocode/json?"
        "latlng=${latLng.latitude},${latLng.longitude}&"
        "language=${widget.localizationItem!.languageCode}&"
        "key=${widget.apiKey}");

    final response = await http.get(url);

    if (response.statusCode != 200) {
      throw Error();
    }

    final responseJson = jsonDecode(response.body);

    if (responseJson['results'] == null) {
      throw Error();
    }

    final result = responseJson['results'][0];

    setState(() {
      String name = "";
      String? locality,
          postalCode,
          country,
          administrativeAreaLevel1,
          administrativeAreaLevel2,
          city,
          subLocalityLevel1,
          subLocalityLevel2;
      bool isOnStreet = false;
      if (result['address_components'] is List<dynamic> &&
          result['address_components'].length != null &&
          result['address_components'].length > 0) {
        for (var i = 0; i < result['address_components'].length; i++) {
          var tmp = result['address_components'][i];
          var types = tmp["types"] as List<dynamic>;
          var shortName = tmp['short_name'];
          if (types == null) {
            continue;
          }
          if (i == 0) {
            // [street_number]
            name = shortName;
            isOnStreet = types.contains('street_number');
            // other index 0 types
            // [establishment, point_of_interest, subway_station, transit_station]
            // [premise]
            // [route]
          } else if (i == 1 && isOnStreet) {
            if (types.contains('route')) {
              name += ", $shortName";
            }
          } else {
            if (types.contains("sublocality_level_1")) {
              subLocalityLevel1 = shortName;
            } else if (types.contains("sublocality_level_2")) {
              subLocalityLevel2 = shortName;
            } else if (types.contains("locality")) {
              locality = shortName;
            } else if (types.contains("administrative_area_level_2")) {
              administrativeAreaLevel2 = shortName;
            } else if (types.contains("administrative_area_level_1")) {
              administrativeAreaLevel1 = shortName;
            } else if (types.contains("country")) {
              country = shortName;
            } else if (types.contains('postal_code')) {
              postalCode = shortName;
            }
          }
        }
      }
      locality = locality ?? administrativeAreaLevel1;
      city = locality;
      this.locationResult = LocationResult()
        ..name = name
        ..locality = locality
        ..latLng = latLng
        ..formattedAddress = result['formatted_address']
        ..placeId = result['place_id']
        ..postalCode = postalCode
        ..country = AddressComponent(name: country, shortName: country)
        ..administrativeAreaLevel1 = AddressComponent(
            name: administrativeAreaLevel1,
            shortName: administrativeAreaLevel1)
        ..administrativeAreaLevel2 = AddressComponent(
            name: administrativeAreaLevel2,
            shortName: administrativeAreaLevel2)
        ..city = AddressComponent(name: city, shortName: city)
        ..subLocalityLevel1 = AddressComponent(
            name: subLocalityLevel1, shortName: subLocalityLevel1)
        ..subLocalityLevel2 = AddressComponent(
            name: subLocalityLevel2, shortName: subLocalityLevel2);
    });
  } catch (e) {
    print(e);
  }
}