Return 当前位置的文本 Flutter

Question

我想 return 一些字符串或文本 :

城市名称
邮政编码
国家

所以这是我的代码：

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:geocoder/geocoder.dart';
import 'package:geolocator/geolocator.dart';

class Maps extends StatefulWidget {
  static Future<void> show(
    BuildContext context,
  ) async {
    await Navigator.of(context).push(
      MaterialPageRoute(
        builder: (context) => Maps(),
        fullscreenDialog: true,
      ),
    );
  }

  @override
  _MapsState createState() => _MapsState();
}

Future<Position> locateUser() async {
  return Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
}

class _MapsState extends State<Maps> {
  Geolocator geolocator = Geolocator();

  Position _currentPosition;
  String _location;
  String _addressLine;
  bool done = false;

  @override
  Widget build(BuildContext context) {
    _getCurrentLocation();
    _getLocation(_currentPosition);
    return Scaffold(
      body: Center(
        child: Container(
          height: MediaQuery.of(context).size.height * 0.4,
          width: MediaQuery.of(context).size.width * 0.6,
          child: Center(
            child: Column(
              children: [
                done == false
                    ? Text("Need to get the position")
                    : Text("val 1: $_location, val 2: $_addressLine"),
                FlatButton(
                  child: Text("Get location"),
                  onPressed: () {
                    _getCurrentLocation();
                  },
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Future<void> _getLocation(Position position) async {
    debugPrint('location: ${position.latitude}');
    final coordinates = new Coordinates(position.latitude, position.longitude);
    List<Address> addresses =
        await Geocoder.local.findAddressesFromCoordinates(coordinates);
    Address first = addresses.first;
    _location = "${first.featureName}";
    _addressLine = " ${first.addressLine}";
    done = true;
  }

  void _getCurrentLocation() {
    Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.best)
        .then((Position position) {
      setState(() {
        _currentPosition = position;
      });
    }).catchError((e) {
      print(e);
    });
  }
}

问题是它总是 returned“需要获得位置”而不是真实地址。我知道这段代码不是最好的，但它是经过数小时研究得出的结果，我没有找到关于使用地理函数的一些明确解释。

Answer 1

我只是对您的代码进行了一些更改，因为我不想破坏您的代码

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:geocoder/geocoder.dart';
import 'package:geolocator/geolocator.dart';

class Maps extends StatefulWidget {
  static Future<void> show(
    BuildContext context,
  ) async {
    await Navigator.of(context).push(
      MaterialPageRoute(
        builder: (context) => Maps(),
        fullscreenDialog: true,
      ),
    );
  }

  @override
  _MapsState createState() => _MapsState();
}

Future<Position> locateUser() async {
  return Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
}

class _MapsState extends State<Maps> {
  Geolocator geolocator = Geolocator();

  Position _currentPosition;
  String _location;
  String _addressLine;
  bool done = false;

 @override
  void initState() {
    _getCurrentLocation();
  super.initState();
  }

  @override
  Widget build(BuildContext context) {
 
    return Scaffold(
      body: Center(
        child: Container(
          height: MediaQuery.of(context).size.height * 0.4,
          width: MediaQuery.of(context).size.width * 0.6,
          child: Center(
            child: Column(
              children: [
                done == false
                    ? Text("Need to get the position")
                    : Text("val 1: $_location, val 2: $_addressLine"),
                FlatButton(
                  child: Text("Get location"),
                  onPressed: () {
                    _getCurrentLocation();
                  },
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Future<void> _getLocation(Position position) async {
    debugPrint('location: ${position.latitude}');
    final coordinates = new Coordinates(position.latitude, position.longitude);
    List<Address> addresses =
        await Geocoder.local.findAddressesFromCoordinates(coordinates);
    Address first = addresses.first;
    _location = "${first.featureName}";
    _addressLine = " ${first.addressLine}";
         setState(() {
              done = true;
          });
 
  }

  void _getCurrentLocation() {
    Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.best)
        .then((Position position) {
    _getLocation(position);
      
    }).catchError((e) {
      print(e);
    });
  }
}

Return 当前位置的文本 Flutter

Return Text with current position Flutter

geolocation

dart

flutter