Question

我的Latlng列表包含在lat＆lng场所列表中我想检查一下我当前的位置是否在所有这些地方附近1公里

static locationListen() async {

    List<LatLng> savedPlace = [
      LatLng(12.333,-344.2222),
      LatLng(1.333,-14.2222),
      LatLng(2.333,-24.2222),
    ]; 

    var locationOptions =
        LocationOptions(accuracy: LocationAccuracy.high, distanceFilter: 10);

    Geolocator().getPositionStream(locationOptions).listen(
          (Position position) {
            LatLng currentLatlng = LatLng(position.latitude,position.longitude);

            //check this if  is this currentLatlng near by 1 kilo from
            // any of those places savedPlace

          },
        );
  }

Answer 1

我看到您正在使用Geolocator插件：

尝试一下：

double distanceInMeters = await Geolocator().distanceBetween(lat1, lng1, lat2, lng2);

Answer 2

您可以使用插件调用latlong 0.6.1

dependencies:
  latlong: ^0.6.1

import 'package:latlong/latlong.dart';

并尝试

Geolocator().getPositionStream(locationOptions).listen( (Position position) {

 LatLng currentLatlng = LatLng(position.latitude,position.longitude); 

   savedPlace.forEach((savedlatlong) { 
       int km = distance.as(LengthUnit.Kilometer,currentLatlng,savedlatlong);
       // do whatever you wanna do with km
      }); 

},);

检查当前位置是否在其他位置附近

2 个答案: