Flutter获取当前位置插件current_location的使用
Flutter获取当前位置插件current_location的使用
简介
这个插件可以获取用户的当前位置信息。返回的数据包括以下内容:
Location({
this.country,
this.countryCode,
this.region,
this.regionName,
this.timezone,
this.latitude,
this.longitude,
this.isp,
this.currentIP,
});
以下是演示图示:
如何使用?
-
安装
在
pubspec.yaml
中添加current_location
,并运行flutter pub get
命令。或者运行:
flutter pub add current_location
pubspec.yaml
文件中的依赖项配置如下:dependencies: current_location: any
-
实现
在实现之前,请确保你理解了参数。
首先需要导入包:
import 'package:current_location/current_location.dart';
下面是一个在小部件中调用函数的示例:
FutureBuilder( future: UserLocation.getValue(), builder: (BuildContext context, dynamic snapshot) { if (snapshot.hasData) { return Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, crossAxisAlignment: CrossAxisAlignment.center, children: [ Text('Country: ${snapshot.data!.country}'), // 国家 Text('Country Code: ${snapshot.data!.countryCode}'), // 国家代码 Text('Region: ${snapshot.data!.region}'), // 地区 Text('Region Name: ${snapshot.data!.regionName}'), // 地区名称 Text('Timezone: ${snapshot.data!.timezone}'), // 时区 Text('Latitude: ${snapshot.data!.latitude}'), // 纬度 Text('Longitude: ${snapshot.data!.longitude}'), // 经度 Text('ISP: ${snapshot.data!.isp}'), // ISP Text('Current IP: ${snapshot.data!.currentIP}'), // 当前IP ], ), ); } return const CircularProgressIndicator(); // 加载指示器 }, )
返回原始数据的示例:
UserLocation.getValue().then((value) => print(value?.{REPLACE_THIS_OBJECT}));
或者
late final UserLocation userLocation = await UserLocation.getValue(); print(userLocation.country!); print(userLocation.{REPLACE_THIS_OBJECT}!)
完整示例Demo
下面是一个完整的Flutter应用示例,展示了如何使用current_location
插件来获取当前位置信息:
import 'package:current_location/current_location.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
[@override](/user/override)
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: FutureBuilder(
future: UserLocation.getValue(), // 获取位置信息
builder: (BuildContext context, dynamic snapshot) {
if (snapshot.hasData) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Text('Country: ${snapshot.data!.country}'), // 国家
Text('Country Code: ${snapshot.data!.countryCode}'), // 国家代码
Text('Region: ${snapshot.data!.region}'), // 地区
Text('Region Name: ${snapshot.data!.regionName}'), // 地区名称
Text('Timezone: ${snapshot.data!.timezone}'), // 时区
Text('Latitude: ${snapshot.data!.latitude}'), // 纬度
Text('Longitude: ${snapshot.data!.longitude}'), // 经度
Text('ISP: ${snapshot.data!.isp}'), // ISP
Text('Current IP: ${snapshot.data!.currentIP}'), // 当前IP
],
),
);
}
return const CircularProgressIndicator(); // 加载指示器
},
),
);
}
}
更多关于Flutter获取当前位置插件current_location的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter获取当前位置插件current_location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,下面是一个使用Flutter插件current_location
来获取当前位置的示例代码。这个示例将展示如何请求位置权限、获取当前位置并在UI上显示这些信息。
首先,确保你在pubspec.yaml
文件中添加了current_location
依赖:
dependencies:
flutter:
sdk: flutter
current_location: ^x.y.z # 请将x.y.z替换为当前最新版本号
然后,运行flutter pub get
来安装依赖。
接下来是主要的Dart代码,通常放在lib/main.dart
文件中:
import 'package:flutter/material.dart';
import 'package:current_location/current_location.dart';
import 'package:permission_handler/permission_handler.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 _locationStatus = "Checking location...";
double? _latitude;
double? _longitude;
@override
void initState() {
super.initState();
_getCurrentLocation();
}
Future<void> _getCurrentLocation() async {
// 请求位置权限
var status = await Permission.locationWhenInUse.status;
if (!status.isGranted) {
var result = await Permission.locationWhenInUse.request();
if (!result.isGranted) {
setState(() {
_locationStatus = "Location permission denied.";
});
return;
}
}
// 获取当前位置
var locationResult = await CurrentLocation.getLocation();
if (locationResult.error != null) {
setState(() {
_locationStatus = "Error fetching location: ${locationResult.error!.message}";
});
return;
}
setState(() {
_locationStatus = "Location fetched successfully.";
_latitude = locationResult.latitude;
_longitude = locationResult.longitude;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Current Location Example"),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
_locationStatus,
style: TextStyle(fontSize: 20),
),
SizedBox(height: 20),
if (_latitude != null && _longitude != null)
Text(
"Latitude: $_latitude, Longitude: $_longitude",
style: TextStyle(fontSize: 18),
),
],
),
),
);
}
}
注意事项
-
权限处理:
- 代码中使用了
permission_handler
插件来处理位置权限请求。确保你同样在pubspec.yaml
中添加了permission_handler
依赖。
- 代码中使用了
-
iOS配置:
- 如果你在iOS上运行这个示例,确保在
Info.plist
文件中添加了必要的权限描述,例如:<key>NSLocationWhenInUseUsageDescription</key> <string>We need your location to provide services</string>
- 如果你在iOS上运行这个示例,确保在
-
Android配置:
- 在Android上,你可能需要在
AndroidManifest.xml
中添加位置权限声明:<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
- 在Android上,你可能需要在
这个示例代码展示了如何使用current_location
插件来获取当前位置,并在UI上显示位置信息。如果有任何问题或需要进一步的帮助,请告诉我!