如何从 Geolocator 获取纬度和经度到 Firestore 位置字段

Question

这是我使用地理定位器获取当前位置的函数

import 'package:geolocator/geolocator.dart';

Future<Position> determinePosition() async {
  LocationPermission permission;

  permission = await Geolocator.checkPermission();
  if (permission == LocationPermission.denied) {
    permission = await Geolocator.requestPermission();
    if (permission == LocationPermission.denied) {
      return Future.error('Location permissions are denied');
    }
  }

  if (permission == LocationPermission.deniedForever) {
    return Future.error(
        'Location permissions are permanently denied, we cannot request permissions.');
  }

  Position position = await Geolocator.getCurrentPosition(
      desiredAccuracy: LocationAccuracy.high);

  return position;
}

该函数返回其纬度和经度，但是，我无法将其分配给 Firestore 中的位置字段

final crab = <String, Object>{
            "species": label,
            "edibility": edibility,
            "location": GeoPoint() // i want to put the result here,
            "timestamp": Timestamp.now()
          };

FirebaseFirestore.instance.collection('crabData').add(crab);

Answer 1

您的

determinePosition

返回一个

Position

对象，而 Firestore 需要一个

GeoPoint

对象。因此，您必须将信息从

Position

转换为

GeoPoint

:

let pos = await determinePosition();
let loc = GeoPoint(pos.latitude, pos.longitude);

此后，您可以将

loc

传递到 Firestore。