127 lines
4.0 KiB
Dart
127 lines
4.0 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'; // 确保引用这个做权限请求
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class MapController extends GetxController with BaseControllerMixin {
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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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final RxBool isLocationPermissionGranted = false.obs;
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// 缓存最后一次的位置，防止 WebView 加载慢于定位
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Position? _lastKnownPosition;
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// 是否已经初始化过地图中心
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bool _hasInitializedMapCenter = false;
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@override
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void onInit() {
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super.onInit();
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requestLocationPermission();
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}
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@override
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void onClose() {
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positionStream?.cancel();
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super.onClose();
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}
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// 请求权限
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void requestLocationPermission() async {
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var status = await Permission.locationWhenInUse.request();
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print("权限状态: $status"); // 在控制台看这个输出
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if (status.isGranted) {
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isLocationPermissionGranted.value = true;
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showToast('定位权限已获取');
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_startLocationTracking();
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}
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else if (status.isPermanentlyDenied) {
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// iOS 特性：如果你之前点过“不允许”，之后再请求都会直接进这里
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isLocationPermissionGranted.value = false;
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// 引导用户去设置页面开启
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openAppSettings();
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}
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else {
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// 第一次被拒绝，或者其他情况
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isLocationPermissionGranted.value = false;
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showErrorToast('需要定位权限才能显示您的位置');
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}
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}
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// 开启定位监听
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void _startLocationTracking() async {
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// 再次检查服务是否开启
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bool serviceEnabled = await Geolocator.isLocationServiceEnabled();
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if (!serviceEnabled) {
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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: 50, // 移动更新范围
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);
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// 先获取一次当前位置，用于快速初始化中心
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Geolocator.getCurrentPosition().then((position) {
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_lastKnownPosition = position;
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_syncLocationToMap(position, isInit: true);
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});
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// 持续监听
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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, isInit: false);
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});
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}
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// 将位置同步给 JS
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void _syncLocationToMap(Position position, {required bool isInit}) {
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if (webViewController == null) return;
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// 如果是第一次定位，或者 WebView 刚加载完且从未设置过中心
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if (isInit || !_hasInitializedMapCenter) {
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webViewController!.evaluateJavascript(
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source: "initLocation(${position.latitude}, ${position.longitude})"
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);
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_hasInitializedMapCenter = true;
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} else {
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// 后续只更新图标位置，不强行移动地图中心（防止用户拖动地图看别处时被拉回）
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webViewController!.evaluateJavascript(
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source: "updateMyLocation(${position.latitude}, ${position.longitude}, ${position.heading})"
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);
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}
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}
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// WebView 加载完成回调
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void onWebViewLoadStop() {
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// 页面加载完了，如果我们已经拿到了定位数据，立刻设置地图中心
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if (_lastKnownPosition != null) {
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_syncLocationToMap(_lastKnownPosition!, isInit: true);
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}
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// 如果业务需要，可以在这里加载默认的推荐路径
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// loadRecommendedRoute();
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}
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// 模拟：获取你的后台推荐路径
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void loadRecommendedRoute() {
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// 示例数据
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List<List<double>> routePoints = [
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[116.397428, 39.90923],
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[116.398000, 39.90950],
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[116.400000, 39.91000],
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];
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String jsonPoints = jsonEncode(routePoints);
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webViewController?.evaluateJavascript(source: "drawCustomRoute($jsonPoints)");
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}
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} |