Flutter - 从坐标获取地理编码地址

Question

我已经在我创建的应用程序中实现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。

我还想弄清楚我需要用什么来打印这些数据。

这就是我试图获取这些数据的原因：

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：

在 CopsOnRoad 的回应之后，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： 使用地理编码

import 'package:geocoding/geocoding.dart';

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

旧解决方案：

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

从版本 6.0.0 开始，地标已从地理定位器中删除并移至geocoding。

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。我们已将这些功能移至他们自己的插件：地理编码。这个新插件是旧方法的改进版本。

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 3

使用 pub.dev flutter_geocoding

https://pub.dev/packages/flutter_geocoding

或者

我使用了 swift 'GMSGeocoder' 和 java 'android.location.Geocoder' 并将其应用于 flutter。我认为它比 pub.dev 中的库 Geocode 更有效。

我的示例代码

地理编码库 java 和 swift 自己添加

爪哇

 @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");

                        }
                );
    }

迅速

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))
          }
    }

扑

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}'.";
  }
}