137 lines
4.3 KiB
Dart
137 lines
4.3 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:flutter_inappwebview/flutter_inappwebview.dart';
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import 'package:geolocator/geolocator.dart';
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import 'package:getx_scaffold/getx_scaffold.dart';
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import 'package:permission_handler/permission_handler.dart';
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class MapController extends GetxController with BaseControllerMixin ,WidgetsBindingObserver{
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@override
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String get builderId => 'map';
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InAppWebViewController? webViewController;
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StreamSubscription<Position>? positionStream;
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// --- 状态标志 ---
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final RxBool isLocationPermissionGranted = false.obs;
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final RxBool isMapReady = false.obs; // 跟踪地图是否加载完成
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Position? _lastKnownPosition;
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@override
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void onInit() {
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super.onInit();
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WidgetsBinding.instance.addObserver(this); // 注册监听
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requestLocationPermission();
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}
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@override
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void onClose() {
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WidgetsBinding.instance.removeObserver(this); // 移除监听
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positionStream?.cancel();
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super.onClose();
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}
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@override
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void didChangeAppLifecycleState(AppLifecycleState state) {
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if (state == AppLifecycleState.resumed) {
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// 回到前台，如果之前有权限且开启过，恢复定位
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if(isLocationPermissionGranted.value) _startLocationTracking();
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} else if (state == AppLifecycleState.paused) {
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// 切到后台，取消定位流
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positionStream?.cancel();
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}
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}
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/// WebView 创建完成时调用
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void onWebViewCreated(InAppWebViewController controller) {
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webViewController = controller;
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// 添加 JS Handler 来监听来自网页的 'mapReady' 事件
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controller.addJavaScriptHandler(
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handlerName: 'mapReady',
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callback: (args) {
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print("Flutter<-JS: Map is ready, starting location tracking.");
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isMapReady.value = true;
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// 地图就绪后，如果已有权限和缓存的定位，则开始定位
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if (isLocationPermissionGranted.value) {
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_startLocationTracking();
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}
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},
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);
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}
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/// 优化后的权限请求函数
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void requestLocationPermission() async {
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bool serviceEnabled = await Geolocator.isLocationServiceEnabled();
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if (!serviceEnabled) {
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showErrorToast('请开启手机的定位服务');
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return;
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}
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var status = await Permission.locationWhenInUse.request();
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switch (status) {
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case PermissionStatus.granted:
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isLocationPermissionGranted.value = true;
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// 权限已获取，如果地图也已就绪，则开始定位
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if (isMapReady.value) {
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_startLocationTracking();
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}
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break;
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case PermissionStatus.denied:
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showErrorToast('需要定位权限才能显示您的位置');
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break;
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case PermissionStatus.permanentlyDenied:
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showErrorToast('定位权限已被永久拒绝，请到设置中手动开启');
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openAppSettings();
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break;
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default:
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showErrorToast('获取定位权限时发生未知错误');
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break;
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}
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}
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/// 开始定位监听 (不再需要 delay)
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void _startLocationTracking() async {
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if (!isLocationPermissionGranted.value ||
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!await Geolocator.isLocationServiceEnabled()) {
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return;
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}
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const LocationSettings locationSettings = LocationSettings(
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accuracy: LocationAccuracy.high,
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distanceFilter: 10,
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);
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// 立即获取一次当前位置，用于快速初始化
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try {
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Position position = await Geolocator.getCurrentPosition();
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_lastKnownPosition = position;
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_syncLocationToMap(position);
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} catch (e) {
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print("Error getting initial position: $e");
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}
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// 持续监听位置变化
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positionStream?.cancel(); // 先取消旧的监听
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positionStream = Geolocator.getPositionStream(locationSettings: locationSettings)
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.listen((Position position) {
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_lastKnownPosition = position;
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_syncLocationToMap(position);
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});
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}
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// 将 Flutter 的定位数据同步给 JS
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void _syncLocationToMap(Position position) {
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if (webViewController == null || !isMapReady.value) return;
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// 只有当 heading 有效且大于 0 时才传给 JS，否则传 null，让 JS 保持上一次的角度
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String headingVal = (position.heading > 0) ? "${position.heading}" : "null";
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webViewController!.evaluateJavascript(
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source:
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"updateMyLocation(${position.latitude}, ${position.longitude}, ${position.heading})",
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);
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}
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}
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