Flutter地理位置获取插件geolocation_flutter的使用

Flutter地理位置获取插件geolocation_flutter的使用

一个无需限制使用次数且无需地图API密钥的地理定位数据包。

开始使用

首先，在您的Dart文件中导入geolocation_flutter包：

import 'package:geolocation_flutter/geolocation_flutter.dart';

然后，您可以使用getGeoLocationData函数，并通过传递纬度和经度或目标语言代码来获取地理信息。

使用示例

以下是一个完整的示例代码，展示了如何使用geolocation_flutter插件获取地理位置数据：

import 'package:flutter/material.dart'; // 导入Flutter框架
import 'package:geolocation_flutter/geolocation_flutter.dart'; // 导入geolocation_flutter插件

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('地理位置获取示例'),
        ),
        body: Center(
          child: GetLocationButton(),
        ),
      ),
    );
  }
}

class GetLocationButton extends StatefulWidget {
  [@override](/user/override)
  _GetLocationButtonState createState() => _GetLocationButtonState();
}

class _GetLocationButtonState extends State<GetLocationButton> {
  String _locationInfo = "点击按钮以获取位置";

  Future<void> _getLocation() async {
    try {
      final GeoLocationData data =
          await getGeoLocationData(latLng: GeoLocationLatLng(50.12136477537388, 8.636582699999995));
      setState(() {
        _locationInfo =
            "纬度: ${data.latitude}, 经度: ${data.longitude}, 地址: ${data.address}";
      });
    } catch (e) {
      setState(() {
        _locationInfo = "无法获取位置信息: $e";
      });
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        ElevatedButton(
          onPressed: _getLocation,
          child: Text("获取位置"),
        ),
        SizedBox(height: 20),
        Text(_locationInfo),
      ],
    );
  }
}

更多关于Flutter地理位置获取插件geolocation_flutter的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter地理位置获取插件geolocation_flutter的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


当然，以下是如何在Flutter项目中使用geolocation_flutter插件来获取地理位置信息的代码示例。

首先，确保你已经在pubspec.yaml文件中添加了geolocation_flutter依赖：

dependencies:
  flutter:
    sdk: flutter
  geolocation_flutter: ^x.y.z  # 请替换为最新版本号

然后，运行flutter pub get来安装依赖。

接下来，你需要修改AndroidManifest.xml和Info.plist文件以请求地理位置权限。

对于Android，在AndroidManifest.xml中添加以下权限：

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

对于iOS，在Info.plist中添加以下键和值：

<key>NSLocationWhenInUseUsageDescription</key>
<string>App needs access to location when in use</string>
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>App needs access to location always</string>

然后，在你的Dart代码中，你可以按照以下步骤使用geolocation_flutter插件：

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Geolocation Example'),
        ),
        body: Center(
          child: GeolocationExample(),
        ),
      ),
    );
  }
}

class GeolocationExample extends StatefulWidget {
  @override
  _GeolocationExampleState createState() => _GeolocationExampleState();
}

class _GeolocationExampleState extends State<GeolocationExample> {
  String _locationData = 'Getting location...';

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Text(_locationData),
        SizedBox(height: 20),
        ElevatedButton(
          onPressed: _getCurrentLocation,
          child: Text('Get Current Location'),
        ),
      ],
    );
  }

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

    // Test if location services are enabled.
    serviceEnabled = await GeolocationFlutter.isLocationServiceEnabled();
    if (!serviceEnabled) {
      setState(() {
        _locationData = 'Location services are disabled.';
      });
      return;
    }

    permission = await GeolocationFlutter.checkPermission();
    if (permission == LocationPermission.denied) {
      permission = await GeolocationFlutter.requestPermission();
      if (permission == LocationPermission.denied) {
        setState(() {
          _locationData = 'Location permissions are denied';
        });
        return;
      }
    }
    if (permission == LocationPermission.deniedForever) {
      setState(() {
        _locationData = 'Location permissions are permanently denied, we cannot request permissions.';
      });
      return;
    }

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

    setState(() {
      _locationData = 'Latitude: ${position.latitude}, Longitude: ${position.longitude}';
    });
  }
}

这个示例代码创建了一个简单的Flutter应用，包含一个按钮，点击按钮时会请求当前地理位置。它首先检查位置服务是否启用，然后请求位置权限，如果权限被授予，则获取当前位置并显示。

请注意，在实际应用中，你应该处理更多的边缘情况和错误，比如网络问题、GPS不可用等。

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