Flutter

Question

我已经在我正在创建的应用程序中实施了一种获取用户经纬度坐标的可靠方法，但似乎无法将这些坐标转换为地标。

我也想弄清楚我需要用什么来打印这些数据。

这就是我试图获取此数据的原因：

List<Placemark> place = [];

void _getPlace() async {
  List<Placemark> newPlace = await _geolocator.placemarkFromCoordinates(_position.latitude, _position.longitude);
  print(newPlace);
  setState(() {
    place = newPlace;
  });
}

谢谢

编辑：

CopsOnRoad 回复后，我收到此错误：

[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: 

NoSuchMethodError: The method 'placemarkFromCoordinates' was called on null.
Receiver: null
Tried calling: placemarkFromCoordinates(51.4998, -0.129)
#0      Object.noSuchMethod  (dart:core-patch/object_patch.dart:50:5)
#1      _NearbyPageState._getPlace 
package:tr/pages/nearby.dart:128
<asynchronous suspension>
#2      _NearbyPageState._controlCard.<anonymous closure> 
package:tr/pages/nearby.dart:629
#3      GestureRecognizer.invokeCallback 
package:flutter/…/gestures/recognizer.dart:182
#4      TapGestureRecognizer._checkUp 
package:flutter/…/gestures/tap.dart:365
#5      TapGestureRecognizer.acceptGesture 
package:flutter/…/gestures/tap.dart:312
#6      GestureArenaManager.sweep 
package:flutter/…/gestures/arena.dart:156
#7      _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent 
package:flutter/…/gestures/binding.dart:222
#8      _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (p<…>

Answer 1

更新： 使用 geocoding

import 'package:geocoding/geocoding.dart';

List<Placemark> placemarks = await placemarkFromCoordinates(52.2165157, 6.9437819);

旧解：

你已经在那里了，你需要的额外东西是：

String _address = ""; // create this variable

void _getPlace() async {
  List<Placemark> newPlace = await _geolocator.placemarkFromCoordinates(_position.latitude, _position.longitude);

  // this is all you need
  Placemark placeMark  = newPlace[0]; 
  String name = placeMark.name;
  String subLocality = placeMark.subLocality;
  String locality = placeMark.locality;
  String administrativeArea = placeMark.administrativeArea;
  String postalCode = placeMark.postalCode;
  String country = placeMark.country;
  String address = "${name}, ${subLocality}, ${locality}, ${administrativeArea} ${postalCode}, ${country}";
  
  print(address);

  setState(() {
    _address = address; // update _address
  });
}

Answer 2

首先，您在 pubspec.yaml

中包含了 lib -geolocator: ^3.0.1

///Get current location
  Geolocator _geolocator = Geolocator();
  String latitude = "";
  String longitude = "";
  String address = "";

试试这个解决方案 -

///Call this function
 _fetchLocation() async {
    Position position = await _geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.best);///Here you have choose level of distance
    latitude = position.latitude.toString() ?? '';
    longitude = position.longitude.toString() ?? '';
    var placemarks = await _geolocator.placemarkFromCoordinates(position.latitude, position.longitude);
    address ='${placemarks.first.name.isNotEmpty ? placemarks.first.name + ', ' : ''}${placemarks.first.thoroughfare.isNotEmpty ? placemarks.first.thoroughfare + ', ' : ''}${placemarks.first.subLocality.isNotEmpty ? placemarks.first.subLocality+ ', ' : ''}${placemarks.first.locality.isNotEmpty ? placemarks.first.locality+ ', ' : ''}${placemarks.first.subAdministrativeArea.isNotEmpty ? placemarks.first.subAdministrativeArea + ', ' : ''}${placemarks.first.postalCode.isNotEmpty ? placemarks.first.postalCode + ', ' : ''}${placemarks.first.administrativeArea.isNotEmpty ? placemarks.first.administrativeArea : ''}';
    print("latitude"+latitude);
    print("longitude"+longitude);
    print("adreess"+address);
  }

Answer 3

地标已从 geolocator starting from version 6.0.0 and moved to geocoding 中删除。

Starting from version 6.0.0 the geocoding features (placemarkFromAddress and placemarkFromCoordinates) are no longer part of the geolocator plugin. We have moved these features to their own plugin: geocoding. This new plugin is an improved version of the old methods.

使用地理编码将纬度和经度转换为地址

List<Placemark> placemarks = await placemarkFromCoordinates(52.2165157, 6.9437819);

Answer 4

使用 Geolocator Plugin 新版本（从版本 6.0.0 开始）。地理编码功能（placemarkFromAddress 和 placemarkFromCoordinates）不再是地理定位器插件的一部分。此方法已将这些功能移动到他们自己的插件中：geocoding

Answer 5

 try {
    await Geolocator()
        .placemarkFromCoordinates(value[0], value[1])
        .then((result) {
      Placemark placeMark = result[0];
      String name = placeMark.name;
      String subLocality = placeMark.subLocality;
      String locality = placeMark.locality;
      String administrativeArea = placeMark.administrativeArea;
      String postalCode = placeMark.postalCode;
      String country = placeMark.country;
      String address =
          "${name}, ${subLocality}, ${locality}, ${administrativeArea} ${postalCode}, ${country}";
      print(address);
      
    });
  } on PlatformException catch (e) {
    print(e);
  }

Answer 6

使用pub.devflutter_geocoding

https://pub.dev/packages/flutter_geocoding

或

我用过swift'GMSGeocoder'和java'android.location.Geocoder'并将其应用到flutter.I认为它比[=中的库地理编码更有效34=].

我的示例代码

地理编码库java和swift自行添加

java

 @Override
 public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
        super.configureFlutterEngine(flutterEngine);

        new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), "samples.flutter.dev/latlng")
                .setMethodCallHandler(
                        (call, result) -> {

                            double lat = call.argument("lat");
                            double lng = call.argument("lng");
                            result.success("return value lat and lng");

                        }
                );
    }

swift

override func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
        let batteryChannel = FlutterMethodChannel(name: "samples.flutter.dev/latlng",
                                                  binaryMessenger: controller.binaryMessenger)
        
        batteryChannel.setMethodCallHandler({
            [weak self] (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
            
            // Note: this method is invoked on the UI thread.
            guard call.method == "latlng" else {
                result(FlutterMethodNotImplemented)
                return
            }
            
            self?.latlng(call,result: result)
        })
        GMSServices.provideAPIKey("")
        GeneratedPluginRegistrant.register(with: self)
        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }


    private func latlng(_ call: FlutterMethodCall,result:FlutterResult) {
        if let args = call.arguments as? Dictionary<String, Any>,
           let lat = args["lat"] as? Double ,let lng = args["lng"] as? Double  {
            result("return latlng result" )
          } else {
            result(FlutterError.init(code: "bad args", message: nil, details: nil))
          }
    }

颤动

Future<void> _getBatteryLevel(double a, double b) async {
  String latlng;
  try {
    final String result = await const MethodChannel('samples.flutter.dev/latlng').invokeMethod(
        'latlng', <String, dynamic>{"lat": a, "lng": b});
    latlng = result;
  } on PlatformException catch (e) {
    latlng = "Failed to get latlng level: '${e.message}'.";
  }
}

Answer 7

未来 getLatAndlong() 异步{ cl = await Geolocator.getCurrentPosition().then((value)=>value);

lat = cl.latitude;
long = cl.longitude;
_kGooglePlex =    CameraPosition(
    target: LatLng(lat,long),
    zoom:14
);
List<Placemark> placemarks = await placemarkFromCoordinates(
    lat, long);
print("country"+placemarks[0].country!);
print("area"+placemarks[0].administrativeArea!);
print("locality"+placemarks[0].locality!);
print("sublocality"+placemarks[0].subLocality!);
print("postlocality"+placemarks[0].postalCode!);
print("street"+placemarks[0].street!);

setState(() {

  countrycurrent = placemarks[0].country!;
  localcurrent = placemarks[0].administrativeArea!;
  madinacurrent = placemarks[0].subLocality!;
  curren=countrycurrent+","+localcurrent+","+madinacurrent;
});

mymarker.add( 标记（信息窗口：信息窗口（标题：地标[0].国家！ + "," + placemarks[0].administrativeArea! + "," + placemarks[0].locality! ), 可拖动：真，

  icon:
  BitmapDescriptor.defaultMarkerWithHue(BitmapDescriptor.hueOrange),

  markerId: MarkerId("4"),

  position: LatLng(lat, long)),

);}

Flutter - 从坐标获取地理编码地址

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dart