Reverse Geocoding for Osm

[jesussmile]

Hi, So using your plugin and your tip on Nominatim, I am able to reverse geocode i.e get the place names from latitude and longitude. Could you please check if this method is okay?

Here is the code

import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';
import 'package:rider/AllWidgets/Divider.dart';
import 'package:flutter_osm_plugin/flutter_osm_plugin.dart';
import 'package:rider/Assistants/assistantMethod.dart';

class MainScreen extends StatefulWidget {
  // const MainScreen({Key key}) : super(key: key);
  static const String idScreen = "mainScreen";

  @override
  _MainScreenState createState() => _MainScreenState();
}

class _MainScreenState extends State<MainScreen> {
  MapController osmController;
  GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey<ScaffoldState>();


  @override
  void initState() {
    // TODO: implement initState
      super.initState();
      osmController = MapController(
      initMapWithUserPosition: false,
      initPosition: GeoPoint(latitude: 28.3949, longitude: 84.1240),
    );

    Future.delayed(Duration(seconds: 10), () async {
      await osmController.zoom(8);
      await osmController.rotateMapCamera(45.0);
      await osmController.currentLocation();
      await osmController.rotateMapCamera(120);
      locatePosition();
      // await controller.rotateMapCamera(null);
    });
  }

  void locatePosition() async {
    Position position = await Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
    String address = await AssistantMethods.searchCoordinateAddress(position);
    print("This is your Address:: " + address);
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
      content: Text(address),
    ));
  }

class AssistantMethods {
  static Future<String> searchCoordinateAddress(Position position) async {
    String placeAddress = "";

    String url =
        "https://nominatim.openstreetmap.org/reverse?format=jsonv2&lat=${position.latitude}&lon=${position.longitude}";


    print(url);
    var response = await RequestAssistant.getRequest(url);

    if (response != "failed") {
      placeAddress = response["display_name"];
    }
    return placeAddress;
  }
}

class RequestAssistant {
  static Future<dynamic> getRequest(String url) async {
    http.Response response = await http.get(Uri.parse(url));

    try {
      if (response.statusCode == 200) {
        String JsonData = response.body;
        var decodeData = jsonDecode(JsonData);
        return decodeData;
      } else {
        return "Failed, no response";
      }
    } catch (exp) {
      return "Failed.";
    }
  }
}

[liodali]

it's ok but you can make more general if you want return object that contain full address and street,country name ,postcode, road

[liodali]

also there are multiple format that we can use in nominatim api to get more information like geocodejson and zoom level also
see this link :
https://nominatim.org/release-docs/develop/api/Reverse/#parameters

[jesussmile]

Oh okay! For now I just need the display_name . Thank you for helping out, it surely will be helpful. Good luck with IOS plugin.