Flutter教程实现地理位置获取

在Flutter中实现地理位置获取时，使用geolocator插件始终返回权限被拒绝的错误，即使已经在AndroidManifest.xml和Info.plist中添加了定位权限。代码中已调用requestPermission()并确认用户授权，但debug时发现status始终是denied。是否需要在原生端额外配置？具体还需要检查哪些关键步骤？测试机型是小米Android 12和iPhone 13，同样的代码在模拟器上可以获取到位置，但真机不行。

3 回复

作为屌丝程序员，我来简单说下。首先你需要导入geolocator库，在pubspec.yaml添加依赖：

dependencies:
  geolocator: ^9.0.2

然后写个方法获取位置：

import 'package:geolocator/geolocator.dart';

Future<Position> _getLocation() async {
  bool serviceEnabled;
  LocationPermission permission;

  // 检查定位服务是否开启
  serviceEnabled = await Geolocator.isLocationServiceEnabled();
  if (!serviceEnabled) {
    return Future.error('Location services are disabled.');
  }

  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.'
    );
  }

  return await Geolocator.getCurrentPosition(
      desiredAccuracy: LocationAccuracy.high);
}

调用时加个await就行了。记得处理权限请求失败的情况，不然可能闪退哦。

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作为一个屌丝程序员，我来分享一个简单的Flutter实现地理位置获取的教程：

  1. 首先，在pubspec.yaml中添加依赖：
dependencies:
  geolocator: ^9.0.2

然后运行flutter pub get。

  1. 在AndroidManifest.xml中加入权限：
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
  1. 初始化Geolocator插件并请求位置：
import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: LocationScreen(),
    );
  }
}

class LocationScreen extends StatefulWidget {
  @override
  _LocationScreenState createState() => _LocationScreenState();
}

class _LocationScreenState extends State<LocationScreen> {
  String _locationMessage = "加载中...";

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

  Future<void> _getLocation() async {
    bool serviceEnabled;
    LocationPermission permission;

    serviceEnabled = await Geolocator.isLocationServiceEnabled();
    if (!serviceEnabled) {
      setState(() => _locationMessage = "位置服务已关闭");
      return;
    }

    permission = await Geolocator.checkPermission();
    if (permission == LocationPermission.denied) {
      permission = await Geolocator.requestPermission();
      if (permission == LocationPermission.denied) {
        setState(() => _locationMessage = "权限被拒绝");
        return;
      }
    }

    if (permission == LocationPermission.deniedForever) {
      setState(() => _locationMessage = "权限永久拒绝");
      return;
    }

    Position position = await Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
    setState(() => _locationMessage = "纬度: ${position.latitude}, 经度: ${position.longitude}");
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("获取位置")),
      body: Center(child: Text(_locationMessage)),
    );
  }
}

这个代码实现了基本的位置获取功能。注意要处理好权限和位置服务的状态判断。

Flutter 获取地理位置教程

在Flutter中获取地理位置需要使用geolocator插件。以下是实现步骤：

1. 添加依赖

在pubspec.yaml文件中添加geolocator依赖：

dependencies:
  geolocator: ^10.0.0

然后运行flutter pub get

2. 配置权限

Android配置

在AndroidManifest.xml中添加位置权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

iOS配置

在Info.plist中添加：

<key>NSLocationWhenInUseUsageDescription</key>
<string>需要您的位置权限来提供定位服务</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>需要您的位置权限来提供定位服务</string>

3. 代码实现

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: LocationScreen(),
    );
  }
}

class LocationScreen extends StatefulWidget {
  @override
  _LocationScreenState createState() => _LocationScreenState();
}

class _LocationScreenState extends State<LocationScreen> {
  Position? _currentPosition;
  String _error = '';

  Future<void> _getCurrentLocation() async {
    try {
      bool serviceEnabled = await Geolocator.isLocationServiceEnabled();
      if (!serviceEnabled) {
        setState(() {
          _error = '位置服务未开启';
        });
        return;
      }

      LocationPermission permission = await Geolocator.checkPermission();
      if (permission == LocationPermission.denied) {
        permission = await Geolocator.requestPermission();
        if (permission == LocationPermission.denied) {
          setState(() {
            _error = '位置权限被拒绝';
          });
          return;
        }
      }

      if (permission == LocationPermission.deniedForever) {
        setState(() {
          _error = '位置权限被永久拒绝';
        });
        return;
      }

      Position position = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high,
      );
      
      setState(() {
        _currentPosition = position;
        _error = '';
      });
    } catch (e) {
      setState(() {
        _error = '获取位置失败: ${e.toString()}';
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('获取位置')),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            if (_currentPosition != null)
              Text(
                "纬度: ${_currentPosition!.latitude}\n经度: ${_currentPosition!.longitude}",
                textAlign: TextAlign.center,
              ),
            if (_error.isNotEmpty) Text(_error),
            ElevatedButton(
              child: Text("获取位置"),
              onPressed: _getCurrentLocation,
            ),
          ],
        ),
      ),
    );
  }
}

4. 功能说明

  1. 首先检查位置服务是否开启
  2. 检查并请求位置权限
  3. 获取当前位置坐标
  4. 处理可能出现的错误情况

你可以根据需要调整desiredAccuracy参数来设置定位精度，可选值有：

  • LocationAccuracy.lowest
  • LocationAccuracy.low
  • LocationAccuracy.medium
  • LocationAccuracy.high
  • LocationAccuracy.best
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