Flutter:如何在Flutter Google Maps中使用纬度来获取地点名称 [英] Flutter: How to get Name of a Place using Lat Long in Flutter Google Maps
问题描述
我正在使用警报应用程序,然后发送Google Maps链接,以打开用户在Google Maps Application中的位置.
I'm working on an Alert app then sends a link of Google Maps that will open up user's location in Google Maps Application.
我还希望通过链接在String中发送该地点的地址.
Along with the link I want to send Address of that place in String as well.
例如
纬度:33.038484&长:66.384858
Lat : 33.038484 & Long: 66.384858
让我们说这些是纽约Square Times的坐标
Lets say that these are the co-ordinates of Square Times, New York
我想发送 https://maps.google.com/q=33.038484,66.384858纽约时报广场
是否可以使用纬度长来获取名称/地址?
Is there a way to get the Name/Address using Lat Long?
推荐答案
您可以使用geolocator软件包.这是我使用的示例代码,您应该可以从中得出您的版本:
You can use the geolocator package. Here is example code that I use, you should be able to work out your version from this:
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';
import 'package:pedantic/pedantic.dart';
import 'package:rflutter_alert/rflutter_alert.dart';
import 'package:person/generated/i18n.dart';
import 'package:person/models/location_data.dart';
import 'package:person/scoped_models/main.dart';
import 'package:person/shared/global_config.dart' as globals;
import 'package:person/widgets/helpers/dialogue_helper.dart';
import 'package:scoped_model/scoped_model.dart';
final Geolocator _geolocator = Geolocator();
LocationData _currentLocationData;
Position _currentPosition;
String _isoCountryCode = "";
/// This method is used to get the current location of the person.
///
Future<LocationData> getCurrentLocation(
BuildContext context, {
Position currentPosition,
// Will be overridden with false if called from PersonProfilePage and a new
// user is being added.
bool updateDatabase = true,
}) async {
MainModel _model = ScopedModel.of(context);
String _address = "";
_currentLocationData = null;
try {
// Android shows a dialogue which automatically updates the location
// permissions settings.
assert(globals.configFromDatabase != null);
// Creates a new 'location' object ie. a new instance of this class in the geoloc package
_currentPosition = await _geolocator.getCurrentPosition(
desiredAccuracy: globals.configFromDatabase.locationAccuracy);
_address = await _getLocationAddress(
_currentPosition.latitude, _currentPosition.longitude);
_currentLocationData = LocationData(
latitude: _currentPosition.latitude,
longitude: _currentPosition.longitude,
address: _address,
isoCountryCode: _isoCountryCode,
);
// Update the person's current location unless this is a new
// user being created in the PersonProfilePage. In that case the form data
// created from this method will be used when the save button is pressed.
if (updateDatabase) {
assert(_currentLocationData != null);
unawaited(_model.updateCurrentLocation(_currentLocationData));
}
return _currentLocationData;
} catch (error) {
unawaited(
showAlertDialogue(
<Your dialogue>
),
);
return null;
}
}
/// This method retrieves placemark data based on a latitude and longitude
/// value pair. It then assembles the data items into an address suitable for
/// display in the app and retains the ISO3166-2 Country code in a separate
/// variable for later storage on the database against the person.
///
/// ! The Geolocator package provides this data for free so there is no need
/// ! to pay for the Google Geocoding API.
///
Future<String> _getLocationAddress(double latitude, double longitude) async {
List<Placemark> newPlace =
await _geolocator.placemarkFromCoordinates(latitude, longitude);
Placemark placeMark = newPlace[0];
String name = placeMark.name;
// String subLocality = placeMark.subLocality;
String locality = placeMark.locality;
String administrativeArea = placeMark.administrativeArea;
// String subAdministrativeArea = placeMark.administrativeArea;
String postalCode = placeMark.postalCode;
String country = placeMark.country;
// String subThoroughfare = placeMark.subThoroughfare;
String thoroughfare = placeMark.thoroughfare;
_isoCountryCode = placeMark.isoCountryCode;
return "$name, $thoroughfare, $locality, $administrativeArea, $postalCode, $country";
}
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