Flutter---GPS定位-北京尧图网络

效果图功能主要通过使用外部库实现GPS定位实现步骤1.引入外部库geolocator: ^14.0.2 # GPS 定位 geocoding: ^2.1.1 #经纬度转详细地址2.添加权限uses-permission android:nameandroid.permission.ACCESS_FINE_LOCATION / uses-permission android:nameandroid.permission.ACCESS_COARSE_LOCATION /3.定义定位服务类LocationServiceimport dart:async; import package:geolocator/geolocator.dart; class LocationService { //单例模式 static final LocationService _instance LocationService._internal(); factory LocationService() _instance; LocationService._internal(); StreamSubscriptionPosition? _positionStream; //位置变化流订阅 bool _isBusy false; //防止并发 Position? _currentPosition; //缓存最新位置 // 位置更新回调 Function(Position position)? onLocationUpdated; Function(String error)? onError; //检查并请求定位权限 Futurebool checkAndRequestPermission() async { try { // 1. 检查 GPS 是否开启 bool serviceEnabled await Geolocator.isLocationServiceEnabled(); if (!serviceEnabled) { // Log.d(⚠️ GPS 未开启); onError?.call(请开启 GPS 定位); return false; } // 2. 检查权限状态 LocationPermission permission await Geolocator.checkPermission(); if (permission LocationPermission.denied) { //如果被拒绝请求权限 permission await Geolocator.requestPermission(); if (permission LocationPermission.denied) { // Log.d(⚠️ 定位权限被拒绝); onError?.call(定位权限被拒绝); return false; } } //检查是否永久被拒绝 if (permission LocationPermission.deniedForever) { // Log.d(⚠️ 定位权限被永久拒绝); onError?.call(请在设置中开启定位权限); return false; } return true; } catch (e) { // Log.d(❌ 权限检查失败: $e); onError?.call(权限检查失败); return false; } } //获取当前位置单次 FuturePosition? getCurrentLocation() async { if (_isBusy) return null; _isBusy true; try { //检查权限 bool hasPermission await checkAndRequestPermission(); if (!hasPermission) { _isBusy false; return null; } //获取位置 Position position await Geolocator.getCurrentPosition( desiredAccuracy: LocationAccuracy.high, ); _currentPosition position; // Log.d( 获取位置成功: ${position.latitude}, ${position.longitude}); return position; } catch (e) { // Log.d(❌ 获取位置失败: $e); onError?.call(获取位置失败); return null; } finally { _isBusy false; } } //持续监听位置变化 void startListening({ Duration interval const Duration(seconds: 5), //更新间隔 int distanceFilter 10, // 移动10米才更新 }) { //如果有旧监听先取消 if (_positionStream ! null) { // Log.d(⚠️ 已有位置监听先取消); stopListening(); } // 先检查权限 checkAndRequestPermission().then((hasPermission) { if (!hasPermission) return; //配置定位参数 final locationSettings LocationSettings( accuracy: LocationAccuracy.high, distanceFilter: distanceFilter, // 移动10米才更新 ); //创建监听 _positionStream Geolocator.getPositionStream( locationSettings: locationSettings, ).listen( //位置更新回调 (Position position) { _currentPosition position; // Log.d( 位置更新: ${position.latitude}, ${position.longitude}); onLocationUpdated?.call(position); //通知外部 }, //错误回调 onError: (error) { // Log.d(❌ 位置监听错误: $error); onError?.call(位置监听出错); }, ); }); } /// 停止监听 void stopListening() { _positionStream?.cancel(); _positionStream null; // Log.d( 位置监听已停止); } /// 获取缓存的位置 Position? get currentPosition _currentPosition; /// 释放资源 void dispose() { stopListening(); } }4.定义UI类使用定位服务类import package:flutter/cupertino.dart; import package:flutter/material.dart; import package:geocoding/geocoding.dart; import package:geolocator/geolocator.dart; import location_service.dart; /// 设备查找页面 class DeviceFindPage extends StatefulWidget { const DeviceFindPage({super.key}); override StateStatefulWidget createState() _DeviceFindPageState(); } class _DeviceFindPageState extends StateDeviceFindPage { // 定位相关 final LocationService _locationService LocationService(); //定位服务实例 Position? _currentPosition; //当前位置 String _currentAddress ; //当前地址 bool _isLoadingLocation false; //加载状态 bool _hasLocationPermission false; //权限状态 // 文本资源 String findDevice 查找设备; String tapRing 点击唤醒; String tapRingTips 温馨提示唤醒设备后会发出声音请注意聆听; String addressTips 温馨提示app会标记设备断联前的最后位置您可以打开点击右边图标转进导航软件查看位置; override void initState() { super.initState(); // 设置定位回调 _setupLocationCallbacks(); // 页面加载时自动获取位置 WidgetsBinding.instance.addPostFrameCallback((_) { _getLocationAndAddress(); }); } override void dispose() { // 释放定位资源 _locationService.dispose(); super.dispose(); } //设置定位回调 void _setupLocationCallbacks() { _locationService.onLocationUpdated (Position position) { if (mounted) { setState(() { _currentPosition position; _hasLocationPermission true; }); // 位置更新时重新获取地址 _getAddressFromLatLng(position.latitude, position.longitude); } }; _locationService.onError (String error) { // Log.d(定位错误: $error); if (mounted) { setState(() { _currentAddress 定位失败: $error; _isLoadingLocation false; }); // 显示提示 ScaffoldMessenger.of(context).showSnackBar( SnackBar( content: Text(定位错误: $error), backgroundColor: Colors.red, ), ); } }; } //获取位置和地址 Futurevoid _getLocationAndAddress() async { if (_isLoadingLocation) return; setState(() { _isLoadingLocation true; _currentAddress 正在获取位置...; }); try { // 获取单次定位 Position? position await _locationService.getCurrentLocation(); if (position ! null mounted) { setState(() { _currentPosition position; _hasLocationPermission true; }); // 获取地址 await _getAddressFromLatLng(position.latitude, position.longitude); } } catch (e) { // Log.d(❌ 获取定位失败: $e); if (mounted) { setState(() { _currentAddress 获取位置失败请检查GPS设置; }); } } finally { if (mounted) { setState(() { _isLoadingLocation false; }); } } } //经纬度转地址 Futurevoid _getAddressFromLatLng(double latitude, double longitude) async { try { //地址解析 ListPlacemark placemarks await placemarkFromCoordinates( latitude, longitude, localeIdentifier: zh_CN, // 中文显示 ); if (placemarks.isNotEmpty mounted) { Placemark place placemarks[0]; // 构建详细地址 ListString addressParts []; // //国家 // if (place.country ! null place.country!.isNotEmpty) { // addressParts.add(place.country!); // } //省份 // if (place.administrativeArea ! null place.administrativeArea!.isNotEmpty) { // Log.d(⭐administrativeArea当前得到的值为${place.administrativeArea!}); // addressParts.add(place.administrativeArea!); // } // //城市 // if (place.locality ! null place.locality!.isNotEmpty) { // Log.d(⭐locality当前得到的值为${place.locality!}); // addressParts.add(place.locality!); // } // //区县 // if (place.subLocality ! null place.subLocality!.isNotEmpty) { // Log.d(⭐subLocality当前得到的值为${place.subLocality!}); // addressParts.add(place.subLocality!); // } //街道 if (place.street ! null place.street!.isNotEmpty) { // Log.d(⭐street当前得到的值为${place.street!}); addressParts.add(place.street!); } String fullAddress addressParts.join( ); // 如果地址为空使用经纬度 if (fullAddress.isEmpty) { fullAddress 纬度: $latitude, 经度: $longitude; } setState(() { _currentAddress fullAddress; _isLoadingLocation false; }); // Log.d( 当前地址: $fullAddress); // 如果需要上传到服务器在这里调用 // await YourHttpService.uploadLocation(latitude, longitude, fullAddress); } } catch (e) { // Log.d(❌ 获取地址失败: $e); if (mounted) { setState(() { _currentAddress 获取地址失败 (经纬度: $latitude, $longitude); _isLoadingLocation false; }); } } } override Widget build(BuildContext context) { return Scaffold( backgroundColor: Color(0xFFF5FCFF), appBar: AppBar( backgroundColor: Color(0xFFF5FCFF), leading: IconButton( onPressed: () { Navigator.pop(context); }, icon: Icon(Icons.arrow_back_ios), ), title: Text( findDevice, style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold), ), centerTitle: true, ), body: Container( width: double.infinity, height: double.infinity, decoration: BoxDecoration( gradient: LinearGradient( begin: Alignment.topCenter, end: Alignment.bottomCenter, colors: [ Color(0xFFF5FCFF), Color(0xFFF2F4F5), ], ), ), child: Column( children: [ SizedBox(height: 10), // 查找容器 _buildFindContainer(), SizedBox(height: 20), // 详细地址显示定位信息 _buildAddress(), ], ), ), ); } // 查找容器 Widget _buildFindContainer() { return Container( width: double.infinity, height: 352, margin: EdgeInsets.symmetric(horizontal: 10), decoration: BoxDecoration( borderRadius: BorderRadius.circular(40), gradient: LinearGradient( begin: Alignment.topCenter, end: Alignment.bottomCenter, colors: [ Color(0xFFCFFFF5), Color(0xFFFFFFFF), ], ), boxShadow: [ BoxShadow( color: Color(0xFF000000).withOpacity(0.1), offset: Offset(3, 0), spreadRadius: 3, blurRadius: 5, ), ], ), child: Column( children: [ SizedBox(height: 20), // 产品图 Container( width: 150, height: 150, decoration: BoxDecoration( shape: BoxShape.circle, color: Color(0xFF777777).withOpacity(0.3), border: Border.all( color: Color(0xFF777777).withOpacity(0.2), width: 20, ), ), child: Center( child: Text(产品图), ), ), SizedBox(height: 50), // 响铃按钮 GestureDetector( onTap: () { // 点击时触发响铃 // Log.d(点击唤醒设备); }, child: Container( height: 52, width: 129, decoration: BoxDecoration( borderRadius: BorderRadius.circular(26), color: Color(0xFF4AC6AD), boxShadow: [ BoxShadow( color: Color(0xFF000000).withOpacity(0.1), offset: Offset(3, 0), spreadRadius: 3, blurRadius: 5, ), ], ), child: Center( child: Text( tapRing, style: TextStyle(color: Colors.white, fontSize: 18), ), ), ), ), Spacer(), // 温馨提示 Text( *$tapRingTips*, style: TextStyle(color: Color(0xFF3D3D3D), fontSize: 12), ), SizedBox(height: 20), ], ), ); } // 详细地址 Widget _buildAddress() { return Container( width: double.infinity, height: 196, margin: EdgeInsets.symmetric(horizontal: 10), decoration: BoxDecoration( borderRadius: BorderRadius.circular(31), color: Colors.white, boxShadow: [ BoxShadow( color: Color(0xFF000000).withOpacity(0.1), offset: Offset(3, 0), spreadRadius: 3, blurRadius: 5, ), ], ), child: Padding( padding: EdgeInsets.all(20), child: Column( crossAxisAlignment: CrossAxisAlignment.start, children: [ //地址行 Row( children: [ //地址 Expanded(child: Text(_currentAddress,style: TextStyle(fontSize: 15,color: Color(0xFF3D3D3D)),)), //定位按钮 IconButton( onPressed: (){ }, icon: Icon(Icons.navigation), ) ], ), //分割线 Container( height: 1, width: double.infinity, color: Colors.black.withOpacity(0.1), ), Spacer(), //温馨提示 Text( *$addressTips*, style: TextStyle(color: Color(0xFF3D3D3D), fontSize: 12), ), SizedBox(height: 5,), ], ), ), ); } }

Flutter---GPS定位

相关推荐

大模型时代：零基础转型AI开发的完整路线图

Java虚拟线程实战：高并发性能优化指南

Claude Code系统提示词精简：对开发者环境性能与项目适配的影响分析

更多资讯

SpringBoot宿舍管理系统开发实践与架构设计

Harper Chrome 扩展：离线运行的私有语法检查器安装、架构与更新机制

Mbed TLS PSA 迁移策略解析：MD Light 与 Block Cipher 的 Legacy/PSA 双路分发机制

大规模语言模型在科学研究中的应用与挑战

三代全长转录组测序技术与应用指南

便携储能电源数字隔离器选型与PCB布局实战指南

今日更新

51单片机开环控制磁阻传感器的硬件匹配与代码实现

AI Agent安全操作数据库：SQL注入防御与参数化查询实战

Android逆向实战：还原激励类App签到接口的签名算法

本周精选

AI驱动的自动化专利分析平台技术解析

LeetCode-Go 题解：1252. Cells with Odd Values in a Matrix（奇数值单元格计数）双解法剖析

在线答疑系统Java毕设实战：Spring Boot前后端分离与状态流转

本月热门

基于YOLO的焊缝缺陷检测：从数据标注到工业部署全流程实践

分布式服务的决策记录

创业产品的首版范围

读完文章，想聊聊您的网站？