feat: optimize Bluetooth connection status display

android/app/src/main/AndroidManifest.xml

@@ -1,4 +1,5 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
     <uses-permission android:name="android.permission.BLUETOOTH"/>
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
     <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" android:usesPermissionFlags="neverForLocation"/>
@@ -14,10 +15,11 @@
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE"/>
     
     <uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>
     <application
-        android:label="lbjconsole"
+        android:label="LBJ Console"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
         <activity
@@ -47,6 +49,15 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
+            
+        <!-- 前台服务配置 -->
+        <service
+            android:name="id.flutter.flutter_background_service.BackgroundService"
+            android:foregroundServiceType="connectedDevice|dataSync"
+            android:exported="false"
+            android:stopWithTask="false"
+            android:enabled="true"
+            tools:replace="android:exported"/>
     </application>
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility and

ios/Runner/Info.plist

@@ -5,7 +5,7 @@
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleDisplayName</key>
-	<string>Lbjconsole</string>
+	<string>LBJ Console</string>
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIdentifier</key>
@@ -13,7 +13,7 @@
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
-	<string>lbjconsole</string>
+	<string>LBJ Console</string>
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>

lib/main.dart

@@ -1,14 +1,20 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:lbjconsole/screens/main_screen.dart';
 import 'package:lbjconsole/util/train_type_util.dart';
 import 'package:lbjconsole/util/loco_info_util.dart';
 import 'package:lbjconsole/util/loco_type_util.dart';
 import 'package:lbjconsole/services/loco_type_service.dart';
 import 'package:lbjconsole/services/database_service.dart';
+import 'package:lbjconsole/services/background_service.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
+  await _initializeNotifications();
+  
+  await BackgroundService.initialize();
+
   await Future.wait([
     TrainTypeUtil.initialize(),
     LocoInfoUtil.initialize(),
@@ -18,6 +24,19 @@ void main() async {
   runApp(const LBJReceiverApp());
 }
 
+Future<void> _initializeNotifications() async {
+  final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
+  
+  const AndroidInitializationSettings initializationSettingsAndroid =
+      AndroidInitializationSettings('@mipmap/ic_launcher');
+      
+  const InitializationSettings initializationSettings = InitializationSettings(
+    android: initializationSettingsAndroid,
+  );
+  
+  await flutterLocalNotificationsPlugin.initialize(initializationSettings);
+}
+
 class LBJReceiverApp extends StatelessWidget {
   const LBJReceiverApp({super.key});
 

lib/models/map_state.dart

@@ -0,0 +1,65 @@
+class MapState {
+  final double zoom;
+  final double centerLat;
+  final double centerLng;
+  final double bearing;
+
+  MapState({
+    required this.zoom,
+    required this.centerLat,
+    required this.centerLng,
+    required this.bearing,
+  });
+
+  Map<String, dynamic> toJson() {
+    return {
+      'zoom': zoom,
+      'centerLat': centerLat,
+      'centerLng': centerLng,
+      'bearing': bearing,
+    };
+  }
+
+  factory MapState.fromJson(Map<String, dynamic> json) {
+    return MapState(
+      zoom: json['zoom']?.toDouble() ?? 10.0,
+      centerLat: json['centerLat']?.toDouble() ?? 39.9042,
+      centerLng: json['centerLng']?.toDouble() ?? 116.4074,
+      bearing: json['bearing']?.toDouble() ?? 0.0,
+    );
+  }
+
+  MapState copyWith({
+    double? zoom,
+    double? centerLat,
+    double? centerLng,
+    double? bearing,
+  }) {
+    return MapState(
+      zoom: zoom ?? this.zoom,
+      centerLat: centerLat ?? this.centerLat,
+      centerLng: centerLng ?? this.centerLng,
+      bearing: bearing ?? this.bearing,
+    );
+  }
+
+  @override
+  String toString() {
+    return 'MapState(zoom: ' + zoom.toString() + ', centerLat: ' + centerLat.toString() + ', centerLng: ' + centerLng.toString() + ', bearing: ' + bearing.toString() + ')';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+    return other is MapState &&
+        other.zoom == zoom &&
+        other.centerLat == centerLat &&
+        other.centerLng == centerLng &&
+        other.bearing == bearing;
+  }
+
+  @override
+  int get hashCode {
+    return zoom.hashCode ^ centerLat.hashCode ^ centerLng.hashCode ^ bearing.hashCode;
+  }
+}

lib/screens/history_screen.dart

@@ -1,10 +1,14 @@
+import 'dart:math' as math;
+import 'dart:isolate';
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:latlong2/latlong.dart';
-import 'package:lbjconsole/models/merged_record.dart';
+import '../models/merged_record.dart';
-import 'package:lbjconsole/services/database_service.dart';
+import '../services/database_service.dart';
-import 'package:lbjconsole/models/train_record.dart';
+import '../models/train_record.dart';
-import 'package:lbjconsole/services/merge_service.dart';
+import '../services/merge_service.dart';
+import '../models/map_state.dart';
+import '../services/map_state_service.dart';
 
 class HistoryScreen extends StatefulWidget {
   final Function(bool isEditing) onEditModeChanged;
@@ -29,6 +33,10 @@ class HistoryScreenState extends State<HistoryScreen> {
   final ScrollController _scrollController = ScrollController();
   bool _isAtTop = true;
   MergeSettings _mergeSettings = MergeSettings();
+  double _itemHeightCache = 0.0;
+
+  final Map<String, double> _mapOptimalZoom = {};
+  final Map<String, bool> _mapCalculating = {};
 
   int getSelectedCount() => _selectedRecords.length;
   Set<String> getSelectedRecordIds() => _selectedRecords;
@@ -48,7 +56,6 @@ class HistoryScreenState extends State<HistoryScreen> {
   @override
   void initState() {
     super.initState();
-    loadRecords();
     _scrollController.addListener(() {
       if (_scrollController.position.atEdge) {
         if (_scrollController.position.pixels == 0) {
@@ -58,6 +65,9 @@ class HistoryScreenState extends State<HistoryScreen> {
         if (_isAtTop) setState(() => _isAtTop = false);
       }
     });
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (mounted) loadRecords();
+    });
   }
 
   @override
@@ -67,7 +77,6 @@ class HistoryScreenState extends State<HistoryScreen> {
   }
 
   Future<void> loadRecords({bool scrollToTop = true}) async {
-    if (mounted) setState(() => _isLoading = true);
     try {
       final allRecords = await DatabaseService.instance.getAllRecords();
       final settingsMap = await DatabaseService.instance.getAllSettings() ?? {};
@@ -75,15 +84,22 @@ class HistoryScreenState extends State<HistoryScreen> {
       final items = MergeService.getMixedList(allRecords, _mergeSettings);
 
       if (mounted) {
-        setState(() {
+        final hasDataChanged = _hasDataChanged(items);
-          _displayItems.clear();
+
-          _displayItems.addAll(items);
+        if (hasDataChanged) {
-          _isLoading = false;
+          setState(() {
-        });
+            _displayItems.clear();
-        if (scrollToTop && (_isAtTop) && _scrollController.hasClients) {
+            _displayItems.addAll(items);
-          _scrollController.animateTo(0.0,
+            _isLoading = false;
-              duration: const Duration(milliseconds: 300),
+          });
-              curve: Curves.easeOut);
+
+          if (scrollToTop && _isAtTop && _scrollController.hasClients) {
+            _scrollController.jumpTo(0.0);
+          }
+        } else {
+          if (_isLoading) {
+            setState(() => _isLoading = false);
+          }
         }
       }
     } catch (e) {
@@ -91,9 +107,83 @@ class HistoryScreenState extends State<HistoryScreen> {
     }
   }
 
+  Future<void> addNewRecord(TrainRecord newRecord) async {
+    try {
+      final settingsMap = await DatabaseService.instance.getAllSettings() ?? {};
+      _mergeSettings = MergeSettings.fromMap(settingsMap);
+
+      final isNewRecord = !_displayItems.any((item) {
+        if (item is TrainRecord) {
+          return item.uniqueId == newRecord.uniqueId;
+        } else if (item is MergedTrainRecord) {
+          return item.records.any((r) => r.uniqueId == newRecord.uniqueId);
+        }
+        return false;
+      });
+
+      if (!isNewRecord) return;
+
+      if (mounted) {
+        final previousScrollOffset = _scrollController.hasClients ? _scrollController.offset : 0.0;
+        final previousItemCount = _displayItems.length;
+        
+        final allRecords = await DatabaseService.instance.getAllRecords();
+        final items = MergeService.getMixedList(allRecords, _mergeSettings);
+
+        setState(() {
+          _displayItems.clear();
+          _displayItems.addAll(items);
+        });
+
+        if (_scrollController.hasClients) {
+          if (_isAtTop) {
+            _scrollController.jumpTo(0.0);
+          } else {
+            final newItemCount = items.length;
+            final itemDifference = newItemCount - previousItemCount;
+            
+            if (itemDifference > 0 && previousScrollOffset > 0) {
+              final itemHeight = _getEstimatedItemHeight();
+              final adjustedOffset = previousScrollOffset + (itemDifference * itemHeight);
+                          
+              _scrollController.jumpTo(adjustedOffset.clamp(0.0, _scrollController.position.maxScrollExtent));
+            }
+          }
+        }
+      }
+    } catch (e) {}
+  }
+
+  double _getEstimatedItemHeight() {
+    if (_itemHeightCache > 0) {
+      return _itemHeightCache;
+    }
+    return 85.0;
+  }
+
+  bool _hasDataChanged(List<Object> newItems) {
+    if (_displayItems.length != newItems.length) return true;
+
+    for (int i = 0; i < _displayItems.length; i++) {
+      final oldItem = _displayItems[i];
+      final newItem = newItems[i];
+
+      if (oldItem.runtimeType != newItem.runtimeType) return true;
+
+      if (oldItem is TrainRecord && newItem is TrainRecord) {
+        if (oldItem.uniqueId != newItem.uniqueId) return true;
+      } else if (oldItem is MergedTrainRecord && newItem is MergedTrainRecord) {
+        if (oldItem.groupKey != newItem.groupKey) return true;
+        if (oldItem.records.length != newItem.records.length) return true;
+      }
+    }
+
+    return false;
+  }
+
   @override
   Widget build(BuildContext context) {
-    if (_isLoading) {
+    if (_isLoading && _displayItems.isEmpty) {
       return const Center(child: CircularProgressIndicator());
     }
     if (_displayItems.isEmpty) {
@@ -151,8 +241,19 @@ class HistoryScreenState extends State<HistoryScreen> {
                   widget.onSelectionChanged();
                 });
               } else {
-                setState(
+                if (isExpanded) {
-                    () => _expandedStates[mergedRecord.groupKey] = !isExpanded);
+                  final mapId =
+                      mergedRecord.records.map((r) => r.uniqueId).join('_');
+                  setState(() {
+                    _expandedStates[mergedRecord.groupKey] = false;
+                    _mapOptimalZoom.remove(mapId);
+                    _mapCalculating.remove(mapId);
+                  });
+                } else {
+                  setState(() {
+                    _expandedStates[mergedRecord.groupKey] = true;
+                  });
+                }
               }
             },
             onLongPress: () {
@@ -181,7 +282,7 @@ class HistoryScreenState extends State<HistoryScreen> {
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
-        _buildExpandedMapForAll(mergedRecord.records),
+        _buildExpandedMapForAll(mergedRecord.records, mergedRecord.groupKey),
         const Divider(color: Colors.white24, height: 24),
         ...mergedRecord.records.map((record) => _buildSubRecordItem(
             record, mergedRecord.latestRecord, _mergeSettings.groupBy)),
@@ -256,6 +357,72 @@ class HistoryScreenState extends State<HistoryScreen> {
     }
   }
 
+  double _calculateOptimalZoom(List<LatLng> positions,
+      {double containerWidth = 400, double containerHeight = 220}) {
+    if (positions.length == 1) return 17.0;
+
+    double minLat = positions[0].latitude;
+    double maxLat = positions[0].latitude;
+    double minLng = positions[0].longitude;
+    double maxLng = positions[0].longitude;
+
+    for (final pos in positions) {
+      minLat = math.min(minLat, pos.latitude);
+      maxLat = math.max(maxLat, pos.latitude);
+      minLng = math.min(minLng, pos.longitude);
+      maxLng = math.max(maxLng, pos.longitude);
+    }
+
+    double latToY(double lat) {
+      final latRad = lat * math.pi / 180.0;
+      return math.log(math.tan(latRad) + 1.0 / math.cos(latRad));
+    }
+
+    double lngToX(double lng) {
+      return lng * math.pi / 180.0;
+    }
+
+    final minX = lngToX(minLng);
+    final maxX = lngToX(maxLng);
+    final minY = latToY(minLat);
+    final maxY = latToY(maxLat);
+
+    const worldSize = 2.0 * math.pi;
+
+    final widthWorld = (maxX - minX) / worldSize;
+    final heightWorld = (maxY - minY) / worldSize;
+
+    const paddingRatio = 0.8;
+
+    final widthZoom =
+        math.log((containerWidth * paddingRatio) / (widthWorld * 256.0)) /
+            math.log(2.0);
+    final heightZoom =
+        math.log((containerHeight * paddingRatio) / (heightWorld * 256.0)) /
+            math.log(2.0);
+
+    final optimalZoom = math.min(widthZoom, heightZoom);
+
+    return math.max(1.0, math.min(20.0, optimalZoom));
+  }
+
+  double _calculateDistance(LatLng pos1, LatLng pos2) {
+    const earthRadius = 6371000;
+    final lat1 = pos1.latitude * math.pi / 180;
+    final lat2 = pos2.latitude * math.pi / 180;
+    final deltaLat = (pos2.latitude - pos1.latitude) * math.pi / 180;
+    final deltaLng = (pos2.longitude - pos1.longitude) * math.pi / 180;
+
+    final a = math.sin(deltaLat / 2) * math.sin(deltaLat / 2) +
+        math.cos(lat1) *
+            math.cos(lat2) *
+            math.sin(deltaLng / 2) *
+            math.sin(deltaLng / 2);
+    final c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a));
+
+    return earthRadius * c;
+  }
+
   String _getLocationInfo(TrainRecord record) {
     List<String> parts = [];
     if (record.route.isNotEmpty && record.route != "<NUL>")
@@ -263,19 +430,59 @@ class HistoryScreenState extends State<HistoryScreen> {
     if (record.direction != 0) parts.add(record.direction == 1 ? "下" : "上");
     if (record.position.isNotEmpty && record.position != "<NUL>") {
       final position = record.position;
-      final cleanPosition = position.endsWith('.') ? position.substring(0, position.length - 1) : position;
+      final cleanPosition = position.endsWith('.')
+          ? position.substring(0, position.length - 1)
+          : position;
       parts.add("${cleanPosition}K");
     }
     return parts.join(' ');
   }
 
-  Widget _buildExpandedMapForAll(List<TrainRecord> records) {
+  Widget _buildExpandedMapForAll(List<TrainRecord> records, String groupKey) {
     final positions = records
         .map((record) => _parsePosition(record.positionInfo))
         .whereType<LatLng>()
         .toList();
     if (positions.isEmpty) return const SizedBox.shrink();
+
+    final mapId = records.map((r) => r.uniqueId).join('_');
     final bounds = LatLngBounds.fromPoints(positions);
+
+    if (!_mapOptimalZoom.containsKey(mapId) &&
+        !(_mapCalculating[mapId] ?? false)) {
+      _mapCalculating[mapId] = true;
+
+      _calculateOptimalZoomAsync(positions,
+              containerWidth: 400, containerHeight: 220)
+          .then((optimalZoom) {
+        if (mounted) {
+          setState(() {
+            _mapOptimalZoom[mapId] = optimalZoom;
+            _mapCalculating[mapId] = false;
+          });
+        }
+      });
+    }
+
+    if (!_mapOptimalZoom.containsKey(mapId)) {
+      return const Column(
+        children: [
+          SizedBox(height: 8),
+          SizedBox(
+            height: 228,
+            child: Center(
+              child: CircularProgressIndicator(
+                color: Colors.blue,
+                strokeWidth: 2,
+              ),
+            ),
+          ),
+        ],
+      );
+    }
+
+    final zoomLevel = _mapOptimalZoom[mapId]!;
+
     return Column(children: [
       const SizedBox(height: 8),
       Container(
@@ -283,42 +490,31 @@ class HistoryScreenState extends State<HistoryScreen> {
           margin: const EdgeInsets.symmetric(vertical: 4),
           decoration: BoxDecoration(
               borderRadius: BorderRadius.circular(8), color: Colors.grey[900]),
-          child: FlutterMap(
+          child: _DelayedMultiMarkerMap(
-              options: MapOptions(
+            key: ValueKey('multi_map_${mapId}_$zoomLevel'),
-                  initialCenter: bounds.center,
+            positions: positions,
-                  initialZoom: 10,
+            center: bounds.center,
-                  minZoom: 5,
+            zoom: zoomLevel,
-                  maxZoom: 18,
+            groupKey: groupKey,
-                  cameraConstraint: CameraConstraint.contain(bounds: bounds)),
+          ))
-              children: [
-                TileLayer(
-                    urlTemplate:
-                        'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
-                    userAgentPackageName: 'org.noxylva.lbjconsole'),
-                MarkerLayer(
-                    markers: positions
-                        .map((pos) => Marker(
-                            point: pos,
-                            width: 40,
-                            height: 40,
-                            child: Container(
-                                decoration: BoxDecoration(
-                                    color: Colors.red.withOpacity(0.8),
-                                    shape: BoxShape.circle,
-                                    border: Border.all(
-                                        color: Colors.white, width: 2)),
-                                child: const Icon(Icons.train,
-                                    color: Colors.white, size: 20))))
-                        .toList())
-              ]))
     ]);
   }
 
+  double _getDefaultZoom(List<LatLng> positions) {
+    if (positions.length == 1) return 15.0;
+    if (positions.length < 10) return 12.0;
+    return 10.0;
+  }
+
   Widget _buildRecordCard(TrainRecord record, {bool isSubCard = false}) {
     final isSelected = _selectedRecords.contains(record.uniqueId);
     final isExpanded =
         !isSubCard && (_expandedStates[record.uniqueId] ?? false);
-    return Card(
+    
+    final GlobalKey itemKey = GlobalKey();
+    
+    final Widget card = Card(
+        key: itemKey,
         color: isSelected && _isEditMode
             ? const Color(0xFF2E2E2E)
             : const Color(0xFF1E1E1E),
@@ -344,7 +540,17 @@ class HistoryScreenState extends State<HistoryScreen> {
                   widget.onSelectionChanged();
                 });
               } else if (!isSubCard) {
-                setState(() => _expandedStates[record.uniqueId] = !isExpanded);
+                if (isExpanded) {
+                  setState(() {
+                    _expandedStates[record.uniqueId] = false;
+                    _mapOptimalZoom.remove(record.uniqueId);
+                    _mapCalculating.remove(record.uniqueId);
+                  });
+                } else {
+                  setState(() {
+                    _expandedStates[record.uniqueId] = true;
+                  });
+                }
               }
             },
             onLongPress: () {
@@ -364,6 +570,20 @@ class HistoryScreenState extends State<HistoryScreen> {
                       _buildLocoInfo(record),
                       if (isExpanded) _buildExpandedContent(record)
                     ]))));
+    
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (_itemHeightCache <= 0 && itemKey.currentContext != null) {
+        final RenderBox renderBox = itemKey.currentContext!.findRenderObject() as RenderBox;
+        final double realHeight = renderBox.size.height;
+        if (realHeight > 0) {
+          setState(() {
+            _itemHeightCache = realHeight;
+          });
+        }
+      }
+    });
+    
+    return card;
   }
 
   Widget _buildRecordHeader(TrainRecord record, {bool isMerged = false}) {
@@ -481,7 +701,8 @@ class HistoryScreenState extends State<HistoryScreen> {
               if (isValidRoute && isValidPosition) const SizedBox(width: 4),
               if (isValidPosition)
                 Flexible(
-                    child: Text("${position.trim().endsWith('.') ? position.trim().substring(0, position.trim().length - 1) : position.trim()}K",
+                    child: Text(
+                        "${position.trim().endsWith('.') ? position.trim().substring(0, position.trim().length - 1) : position.trim()}K",
                         style:
                             const TextStyle(fontSize: 16, color: Colors.white),
                         overflow: TextOverflow.ellipsis))
@@ -495,40 +716,60 @@ class HistoryScreenState extends State<HistoryScreen> {
 
   Widget _buildExpandedContent(TrainRecord record) {
     final position = _parsePosition(record.positionInfo);
-    return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+    final mapId = record.uniqueId;
-      if (position != null)
+
-        Column(children: [
+    if (position == null) {
-          const SizedBox(height: 8),
+      return const SizedBox.shrink();
-          Container(
+    }
-              height: 220,
+
-              margin: const EdgeInsets.symmetric(vertical: 4),
+    if (!_mapOptimalZoom.containsKey(mapId) &&
-              decoration: BoxDecoration(
+        !(_mapCalculating[mapId] ?? false)) {
-                  borderRadius: BorderRadius.circular(8),
+      _mapCalculating[mapId] = true;
-                  color: Colors.grey[900]),
+
-              child: FlutterMap(
+      _calculateOptimalZoomAsync([position],
-                  options:
+              containerWidth: 400, containerHeight: 220)
-                      MapOptions(initialCenter: position, initialZoom: 15.0),
+          .then((optimalZoom) {
-                  children: [
+        if (mounted) {
-                    TileLayer(
+          setState(() {
-                        urlTemplate:
+            _mapOptimalZoom[mapId] = optimalZoom;
-                            'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+            _mapCalculating[mapId] = false;
-                        userAgentPackageName: 'org.noxylva.lbjconsole'),
+          });
-                    MarkerLayer(markers: [
+        }
-                      Marker(
+      });
-                          point: position,
+    }
-                          width: 40,
+
-                          height: 40,
+    if (!_mapOptimalZoom.containsKey(mapId)) {
-                          child: Container(
+      return const Column(
-                              decoration: BoxDecoration(
+        children: [
-                                  color: Colors.red,
+          SizedBox(height: 8),
-                                  borderRadius: BorderRadius.circular(20),
+          SizedBox(
-                                  border: Border.all(
+            height: 228,
-                                      color: Colors.white, width: 2)),
+            child: Center(
-                              child: const Icon(Icons.train,
+              child: CircularProgressIndicator(
-                                  color: Colors.white, size: 20)))
+                color: Colors.blue,
-                    ])
+                strokeWidth: 2,
-                  ]))
+              ),
-        ])
+            ),
+          ),
+        ],
+      );
+    }
+
+    final zoomLevel = _mapOptimalZoom[mapId]!;
+
+    return Column(children: [
+      const SizedBox(height: 8),
+      Container(
+          height: 220,
+          margin: const EdgeInsets.symmetric(vertical: 4),
+          decoration: BoxDecoration(
+              borderRadius: BorderRadius.circular(8), color: Colors.grey[900]),
+          child: _DelayedMapWithMarker(
+            key: ValueKey('map_${mapId}_$zoomLevel'),
+            position: position,
+            zoom: zoomLevel,
+            recordId: record.uniqueId,
+          ))
     ]);
   }
 
@@ -566,4 +807,325 @@ class HistoryScreenState extends State<HistoryScreen> {
       return null;
     }
   }
+
+  Future<_BoundaryBox> _calculateBoundaryBoxParallel(
+      List<LatLng> positions) async {
+    if (positions.length < 100) {
+      return _calculateBoundaryBoxIsolate(positions);
+    }
+
+    final chunkSize = (positions.length / 4).ceil();
+    final chunks = <List<LatLng>>[];
+
+    for (int i = 0; i < positions.length; i += chunkSize) {
+      final end = math.min(i + chunkSize, positions.length);
+      chunks.add(positions.sublist(i, end));
+    }
+
+    final results = await Future.wait(chunks.map(
+        (chunk) => Isolate.run(() => _calculateBoundaryBoxIsolate(chunk))));
+
+    double minLat = results[0].minLat;
+    double maxLat = results[0].maxLat;
+    double minLng = results[0].minLng;
+    double maxLng = results[0].maxLng;
+
+    for (final box in results.skip(1)) {
+      minLat = math.min(minLat, box.minLat);
+      maxLat = math.max(maxLat, box.maxLat);
+      minLng = math.min(minLng, box.minLng);
+      maxLng = math.max(maxLng, box.maxLng);
+    }
+
+    return _BoundaryBox(minLat, maxLat, minLng, maxLng);
+  }
+
+  Future<double> _calculateOptimalZoomAsync(List<LatLng> positions,
+      {required double containerWidth, required double containerHeight}) async {
+    if (positions.length == 1) return 17.0;
+
+    final boundaryBox = await _calculateBoundaryBoxParallel(positions);
+
+    double latToY(double lat) {
+      final latRad = lat * math.pi / 180.0;
+      return math.log(math.tan(latRad) + 1.0 / math.cos(latRad));
+    }
+
+    double lngToX(double lng) {
+      return lng * math.pi / 180.0;
+    }
+
+    final minX = lngToX(boundaryBox.minLng);
+    final maxX = lngToX(boundaryBox.maxLng);
+    final minY = latToY(boundaryBox.minLat);
+    final maxY = latToY(boundaryBox.maxLat);
+
+    const worldSize = 2.0 * math.pi;
+
+    final widthWorld = (maxX - minX) / worldSize;
+    final heightWorld = (maxY - minY) / worldSize;
+
+    const paddingRatio = 0.8;
+
+    final widthZoom =
+        math.log((containerWidth * paddingRatio) / (widthWorld * 256.0)) /
+            math.log(2.0);
+    final heightZoom =
+        math.log((containerHeight * paddingRatio) / (heightWorld * 256.0)) /
+            math.log(2.0);
+
+    final optimalZoom = math.min(widthZoom, heightZoom);
+
+    return math.max(5.0, math.min(18.0, optimalZoom));
+  }
+}
+
+class _BoundaryBox {
+  final double minLat;
+  final double maxLat;
+  final double minLng;
+  final double maxLng;
+
+  _BoundaryBox(this.minLat, this.maxLat, this.minLng, this.maxLng);
+}
+
+_BoundaryBox _calculateBoundaryBoxIsolate(List<LatLng> positions) {
+  double minLat = positions[0].latitude;
+  double maxLat = positions[0].latitude;
+  double minLng = positions[0].longitude;
+  double maxLng = positions[0].longitude;
+
+  for (final pos in positions) {
+    minLat = math.min(minLat, pos.latitude);
+    maxLat = math.max(maxLat, pos.latitude);
+    minLng = math.min(minLng, pos.longitude);
+    maxLng = math.max(maxLng, pos.longitude);
+  }
+
+  return _BoundaryBox(minLat, maxLat, minLng, maxLng);
+}
+
+class _DelayedMapWithMarker extends StatefulWidget {
+  final LatLng position;
+  final double zoom;
+  final String recordId;
+
+  const _DelayedMapWithMarker({
+    Key? key,
+    required this.position,
+    required this.zoom,
+    required this.recordId,
+  }) : super(key: key);
+
+  @override
+  State<_DelayedMapWithMarker> createState() => _DelayedMapWithMarkerState();
+}
+
+class _DelayedMapWithMarkerState extends State<_DelayedMapWithMarker> {
+  late final MapController _mapController;
+  late final String _mapKey;
+  bool _isInitializing = true;
+
+  @override
+  void initState() {
+    super.initState();
+    _mapController = MapController();
+    _mapKey = MapStateService.instance.getSingleRecordMapKey(widget.recordId);
+    _initializeMapState();
+  }
+
+  Future<void> _initializeMapState() async {
+    final savedState = await MapStateService.instance.getMapState(_mapKey);
+    if (savedState != null && mounted) {
+      _mapController.move(
+        LatLng(savedState.centerLat, savedState.centerLng),
+        savedState.zoom,
+      );
+      if (savedState.bearing != 0.0) {
+        _mapController.rotate(savedState.bearing);
+      }
+    }
+    setState(() {
+      _isInitializing = false;
+    });
+  }
+
+  void _onCameraMove() {
+    if (_isInitializing) return;
+
+    final camera = _mapController.camera;
+    final state = MapState(
+      zoom: camera.zoom,
+      centerLat: camera.center.latitude,
+      centerLng: camera.center.longitude,
+      bearing: camera.rotation,
+    );
+
+    MapStateService.instance.saveMapState(_mapKey, state);
+  }
+
+  @override
+  void dispose() {
+    _mapController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_isInitializing) {
+      return FlutterMap(
+        options: MapOptions(
+          initialCenter: widget.position,
+          initialZoom: widget.zoom,
+          onPositionChanged: (position, hasGesture) => _onCameraMove(),
+        ),
+        mapController: _mapController,
+        children: [
+          TileLayer(
+              urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+              userAgentPackageName: 'org.noxylva.lbjconsole'),
+          MarkerLayer(markers: [
+            Marker(
+                point: widget.position,
+                width: 40,
+                height: 40,
+                child: Container(
+                    decoration: BoxDecoration(
+                        color: Colors.red,
+                        borderRadius: BorderRadius.circular(20),
+                        border: Border.all(color: Colors.white, width: 2)),
+                    child:
+                        const Icon(Icons.train, color: Colors.white, size: 20)))
+          ])
+        ],
+      );
+    }
+
+    return FlutterMap(
+      options: MapOptions(
+        onPositionChanged: (position, hasGesture) => _onCameraMove(),
+      ),
+      mapController: _mapController,
+      children: [
+        TileLayer(
+            urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+            userAgentPackageName: 'org.noxylva.lbjconsole'),
+        MarkerLayer(markers: [
+          Marker(
+              point: widget.position,
+              width: 40,
+              height: 40,
+              child: Container(
+                  decoration: BoxDecoration(
+                      color: Colors.red,
+                      borderRadius: BorderRadius.circular(20),
+                      border: Border.all(color: Colors.white, width: 2)),
+                  child:
+                      const Icon(Icons.train, color: Colors.white, size: 20)))
+        ])
+      ],
+    );
+  }
+}
+
+class _DelayedMultiMarkerMap extends StatefulWidget {
+  final List<LatLng> positions;
+  final LatLng center;
+  final double zoom;
+  final String groupKey;
+
+  const _DelayedMultiMarkerMap({
+    Key? key,
+    required this.positions,
+    required this.center,
+    required this.zoom,
+    required this.groupKey,
+  }) : super(key: key);
+
+  @override
+  State<_DelayedMultiMarkerMap> createState() => _DelayedMultiMarkerMapState();
+}
+
+class _DelayedMultiMarkerMapState extends State<_DelayedMultiMarkerMap> {
+  late final MapController _mapController;
+  late final String _mapKey;
+  bool _isInitializing = true;
+
+  @override
+  void initState() {
+    super.initState();
+    _mapController = MapController();
+    _mapKey = MapStateService.instance.getMergedRecordMapKey(widget.groupKey);
+    _initializeMapState();
+  }
+
+  Future<void> _initializeMapState() async {
+    final savedState = await MapStateService.instance.getMapState(_mapKey);
+    if (savedState != null && mounted) {
+      _mapController.move(
+        LatLng(savedState.centerLat, savedState.centerLng),
+        savedState.zoom,
+      );
+      if (savedState.bearing != 0.0) {
+        _mapController.rotate(savedState.bearing);
+      }
+    } else if (mounted) {
+      _mapController.move(widget.center, widget.zoom);
+    }
+    setState(() {
+      _isInitializing = false;
+    });
+  }
+
+  void _onCameraMove() {
+    if (_isInitializing) return;
+
+    final camera = _mapController.camera;
+    final state = MapState(
+      zoom: camera.zoom,
+      centerLat: camera.center.latitude,
+      centerLng: camera.center.longitude,
+      bearing: camera.rotation,
+    );
+
+    MapStateService.instance.saveMapState(_mapKey, state);
+  }
+
+  @override
+  void dispose() {
+    _mapController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return FlutterMap(
+      options: MapOptions(
+        onPositionChanged: (position, hasGesture) => _onCameraMove(),
+        minZoom: 5,
+        maxZoom: 18,
+      ),
+      mapController: _mapController,
+      children: [
+        TileLayer(
+          urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+          userAgentPackageName: 'org.noxylva.lbjconsole',
+        ),
+        MarkerLayer(
+            markers: widget.positions
+                .map((pos) => Marker(
+                    point: pos,
+                    width: 40,
+                    height: 40,
+                    child: Container(
+                        decoration: BoxDecoration(
+                            color: Colors.red.withOpacity(0.8),
+                            shape: BoxShape.circle,
+                            border: Border.all(color: Colors.white, width: 2)),
+                        child: const Icon(Icons.train,
+                            color: Colors.white, size: 20))))
+                .toList()),
+      ],
+    );
+  }
 }

lib/screens/main_screen.dart

@@ -10,8 +10,161 @@ import 'package:lbjconsole/screens/settings_screen.dart';
 import 'package:lbjconsole/services/ble_service.dart';
 import 'package:lbjconsole/services/database_service.dart';
 import 'package:lbjconsole/services/notification_service.dart';
+import 'package:lbjconsole/services/background_service.dart';
 import 'package:lbjconsole/themes/app_theme.dart';
 
+class _ConnectionStatusWidget extends StatefulWidget {
+  final BLEService bleService;
+  final DateTime? lastReceivedTime;
+
+  const _ConnectionStatusWidget({
+    required this.bleService,
+    required this.lastReceivedTime,
+  });
+
+  @override
+  State<_ConnectionStatusWidget> createState() =>
+      _ConnectionStatusWidgetState();
+}
+
+class _ConnectionStatusWidgetState extends State<_ConnectionStatusWidget> {
+  StreamSubscription? _connectionSubscription;
+  String _deviceStatus = "未连接";
+  bool _isConnected = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _connectionSubscription =
+        widget.bleService.connectionStream.listen((connected) {
+      if (mounted) {
+        setState(() {
+          _isConnected = connected;
+          _deviceStatus = connected ? "已连接" : "未连接";
+        });
+      }
+    });
+    _isConnected = widget.bleService.isConnected;
+    _deviceStatus = widget.bleService.deviceStatus;
+  }
+
+  @override
+  void dispose() {
+    _connectionSubscription?.cancel();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      children: [
+        Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            if (widget.lastReceivedTime == null || !_isConnected) ...[
+              Text(_deviceStatus,
+                  style: const TextStyle(color: Colors.white70, fontSize: 12)),
+            ],
+            _LastReceivedTimeWidget(
+              lastReceivedTime: widget.lastReceivedTime,
+              isConnected: _isConnected,
+            ),
+          ],
+        ),
+        const SizedBox(width: 8),
+        Container(
+          width: 8,
+          height: 8,
+          decoration: BoxDecoration(
+            color: _isConnected ? Colors.green : Colors.red,
+            shape: BoxShape.circle,
+          ),
+        ),
+      ],
+    );
+  }
+}
+
+class _LastReceivedTimeWidget extends StatefulWidget {
+  final DateTime? lastReceivedTime;
+  final bool isConnected;
+
+  const _LastReceivedTimeWidget({
+    required this.lastReceivedTime,
+    required this.isConnected,
+  });
+
+  @override
+  State<_LastReceivedTimeWidget> createState() =>
+      _LastReceivedTimeWidgetState();
+}
+
+class _LastReceivedTimeWidgetState extends State<_LastReceivedTimeWidget> {
+  Timer? _timer;
+
+  @override
+  void initState() {
+    super.initState();
+    _startTimer();
+  }
+
+  @override
+  void didUpdateWidget(_LastReceivedTimeWidget oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.lastReceivedTime != widget.lastReceivedTime ||
+        oldWidget.isConnected != widget.isConnected) {
+      _startTimer();
+    }
+  }
+
+  void _startTimer() {
+    _timer?.cancel();
+    if (widget.lastReceivedTime != null && widget.isConnected) {
+      _timer = Timer.periodic(const Duration(seconds: 1), (timer) {
+        if (mounted) {
+          setState(() {});
+        }
+      });
+    }
+  }
+
+  String _formatTime() {
+    if (widget.lastReceivedTime == null) return '';
+
+    final now = DateTime.now();
+    final difference = now.difference(widget.lastReceivedTime!);
+
+    if (difference.inDays > 0) {
+      return '${difference.inDays}天前';
+    } else if (difference.inHours > 0) {
+      return '${difference.inHours}小时前';
+    } else if (difference.inMinutes > 0) {
+      return '${difference.inMinutes}分钟前';
+    } else {
+      return '${difference.inSeconds}秒前';
+    }
+  }
+
+  @override
+  void dispose() {
+    _timer?.cancel();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (widget.lastReceivedTime == null || !widget.isConnected) {
+      return const SizedBox.shrink();
+    }
+
+    return Text(
+      _formatTime(),
+      style: const TextStyle(color: Colors.white70, fontSize: 12),
+    );
+  }
+}
+
 class MainScreen extends StatefulWidget {
   const MainScreen({super.key});
 
@@ -27,7 +180,8 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
 
   StreamSubscription? _connectionSubscription;
   StreamSubscription? _dataSubscription;
-
+  StreamSubscription? _lastReceivedTimeSubscription;
+  DateTime? _lastReceivedTime;
   bool _isHistoryEditMode = false;
   final GlobalKey<HistoryScreenState> _historyScreenKey =
       GlobalKey<HistoryScreenState>();
@@ -39,12 +193,36 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     _bleService = BLEService();
     _bleService.initialize();
     _initializeServices();
+    _checkAndStartBackgroundService();
+    _setupLastReceivedTimeListener();
+  }
+
+  Future<void> _checkAndStartBackgroundService() async {
+    final settings = await DatabaseService.instance.getAllSettings() ?? {};
+    final backgroundServiceEnabled =
+        (settings['backgroundServiceEnabled'] ?? 0) == 1;
+
+    if (backgroundServiceEnabled) {
+      await BackgroundService.startService();
+    }
+  }
+
+  void _setupLastReceivedTimeListener() {
+    _lastReceivedTimeSubscription =
+        _bleService.lastReceivedTimeStream.listen((time) {
+      if (mounted) {
+        setState(() {
+          _lastReceivedTime = time;
+        });
+      }
+    });
   }
 
   @override
   void dispose() {
     _connectionSubscription?.cancel();
     _dataSubscription?.cancel();
+    _lastReceivedTimeSubscription?.cancel();
     WidgetsBinding.instance.removeObserver(this);
     super.dispose();
   }
@@ -59,14 +237,10 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
   Future<void> _initializeServices() async {
     await _notificationService.initialize();
 
-    _connectionSubscription = _bleService.connectionStream.listen((_) {
-      if (mounted) setState(() {});
-    });
-
     _dataSubscription = _bleService.dataStream.listen((record) {
       _notificationService.showTrainNotification(record);
       if (_historyScreenKey.currentState != null) {
-        _historyScreenKey.currentState!.loadRecords(scrollToTop: true);
+        _historyScreenKey.currentState!.addNewRecord(record);
       }
     });
   }
@@ -122,17 +296,10 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
       actions: [
         Row(
           children: [
-            Container(
+            _ConnectionStatusWidget(
-              width: 8,
+              bleService: _bleService,
-              height: 8,
+              lastReceivedTime: _lastReceivedTime,
-              decoration: BoxDecoration(
-                color: _bleService.isConnected ? Colors.green : Colors.red,
-                shape: BoxShape.circle,
-              ),
             ),
-            const SizedBox(width: 8),
-            Text(_bleService.deviceStatus,
-                style: const TextStyle(color: Colors.white70)),
             IconButton(
               icon: const Icon(Icons.bluetooth, color: Colors.white),
               onPressed: _showConnectionDialog,
@@ -263,6 +430,8 @@ class _PixelPerfectBluetoothDialogState
   List<BluetoothDevice> _devices = [];
   _ScanState _scanState = _ScanState.initial;
   StreamSubscription? _connectionSubscription;
+  StreamSubscription? _lastReceivedTimeSubscription;
+  DateTime? _lastReceivedTime;
   @override
   void initState() {
     super.initState();
@@ -277,6 +446,7 @@ class _PixelPerfectBluetoothDialogState
   @override
   void dispose() {
     _connectionSubscription?.cancel();
+    _lastReceivedTimeSubscription?.cancel();
     super.dispose();
   }
 
@@ -306,6 +476,17 @@ class _PixelPerfectBluetoothDialogState
     await widget.bleService.disconnect();
   }
 
+  void _setupLastReceivedTimeListener() {
+    _lastReceivedTimeSubscription =
+        widget.bleService.lastReceivedTimeStream.listen((timestamp) {
+      if (mounted) {
+        setState(() {
+          _lastReceivedTime = timestamp;
+        });
+      }
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     final isConnected = widget.bleService.isConnected;
@@ -342,6 +523,13 @@ class _PixelPerfectBluetoothDialogState
       Text(device?.remoteId.str ?? '',
           style: Theme.of(context).textTheme.bodySmall,
           textAlign: TextAlign.center),
+      if (_lastReceivedTime != null) ...[
+        const SizedBox(height: 8),
+        _LastReceivedTimeWidget(
+          lastReceivedTime: _lastReceivedTime,
+          isConnected: widget.bleService.isConnected,
+        ),
+      ],
       const SizedBox(height: 16),
       ElevatedButton.icon(
           onPressed: _disconnect,

lib/screens/map_screen.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:latlong2/latlong.dart';
@@ -26,8 +27,8 @@ class _MapScreenState extends State<MapScreen> {
   bool _isMapInitialized = false;
   bool _isFollowingLocation = false;
   bool _isLocationPermissionGranted = false;
+  Timer? _locationTimer;
 
-  static const LatLng _defaultPosition = LatLng(39.9042, 116.4074);
 
   @override
   void initState() {
@@ -35,12 +36,13 @@ class _MapScreenState extends State<MapScreen> {
     _initializeMap();
     _loadTrainRecords();
     _loadSettings();
-    _requestLocationPermission();
+    _startLocationUpdates();
   }
 
   @override
   void dispose() {
     _saveSettings();
+    _locationTimer?.cancel();
     super.dispose();
   }
 
@@ -49,6 +51,9 @@ class _MapScreenState extends State<MapScreen> {
   Future<void> _requestLocationPermission() async {
     bool serviceEnabled = await Geolocator.isLocationServiceEnabled();
     if (!serviceEnabled) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('请开启定位服务')),
+      );
       return;
     }
 
@@ -58,6 +63,9 @@ class _MapScreenState extends State<MapScreen> {
     }
 
     if (permission == LocationPermission.deniedForever) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('定位权限被拒绝，请在设置中开启')),
+      );
       return;
     }
 
@@ -78,12 +86,39 @@ class _MapScreenState extends State<MapScreen> {
         _userLocation = LatLng(position.latitude, position.longitude);
       });
 
-      if (!_isMapInitialized && _userLocation != null) {
+    } catch (e) {
-        _mapController.move(_userLocation!, _currentZoom);
+    }
-      }
-    } catch (e) {}
   }
 
+  void _startLocationUpdates() {
+    _requestLocationPermission();
+    
+    _locationTimer = Timer.periodic(const Duration(seconds: 30), (timer) {
+      if (_isLocationPermissionGranted) {
+        _getCurrentLocation();
+      }
+    });
+  }
+
+  Future<void> _forceUpdateLocation() async {
+    
+    try {
+      Position position = await Geolocator.getCurrentPosition(
+        desiredAccuracy: LocationAccuracy.best,
+      );
+
+      final newLocation = LatLng(position.latitude, position.longitude);
+      
+      setState(() {
+        _userLocation = newLocation;
+      });
+
+      _mapController.move(newLocation, 15.0);
+    } catch (e) {
+    }
+  }
+
+
   Future<void> _loadSettings() async {
     try {
       final settings = await DatabaseService.instance.getAllSettings();
@@ -159,13 +194,12 @@ class _MapScreenState extends State<MapScreen> {
     } else if (_lastTrainLocation != null) {
       targetLocation = _lastTrainLocation;
     } else {
-      targetLocation = _defaultPosition;
+      _isMapInitialized = true;
+      return;
     }
 
-    WidgetsBinding.instance.addPostFrameCallback((_) {
+    _centerMap(targetLocation!, zoom: _currentZoom);
-      _centerMap(targetLocation!, zoom: _currentZoom);
+    _isMapInitialized = true;
-      _isMapInitialized = true;
-    });
   }
 
   void _centerMap(LatLng location, {double? zoom}) {
@@ -313,7 +347,7 @@ class _MapScreenState extends State<MapScreen> {
   }
 
   void _centerToMyLocation() {
-    _centerMap(_lastTrainLocation ?? _defaultPosition, zoom: 15.0);
+    _centerMap(_lastTrainLocation ?? const LatLng(39.9042, 116.4074), zoom: 15.0);
   }
 
   void _centerToLastTrain() {
@@ -537,11 +571,12 @@ class _MapScreenState extends State<MapScreen> {
           FlutterMap(
             mapController: _mapController,
             options: MapOptions(
-              initialCenter: _lastTrainLocation ?? _defaultPosition,
+              initialCenter: _lastTrainLocation ?? const LatLng(39.9042, 116.4074),
               initialZoom: _currentZoom,
               initialRotation: _currentRotation,
               minZoom: 4.0,
               maxZoom: 18.0,
+
               onPositionChanged: (MapCamera camera, bool hasGesture) {
                 if (hasGesture) {
                   setState(() {
@@ -552,28 +587,6 @@ class _MapScreenState extends State<MapScreen> {
                   _saveSettings();
                 }
               },
-              onTap: (_, point) {
-                for (final record in _trainRecords) {
-                  final coords = record.getCoordinates();
-                  final dmsCoords = _parseDmsCoordinate(record.positionInfo);
-                  LatLng? recordPosition;
-
-                  if (dmsCoords != null) {
-                    recordPosition = dmsCoords;
-                  } else if (coords['lat'] != 0.0 && coords['lng'] != 0.0) {
-                    recordPosition = LatLng(coords['lat']!, coords['lng']!);
-                  }
-
-                  if (recordPosition != null) {
-                    final distance = const Distance()
-                        .as(LengthUnit.Meter, recordPosition, point);
-                    if (distance < 50) {
-                      _showTrainDetailsDialog(record, recordPosition);
-                      break;
-                    }
-                  }
-                }
-              },
             ),
             children: [
               TileLayer(
@@ -622,10 +635,7 @@ class _MapScreenState extends State<MapScreen> {
                   heroTag: 'myLocation',
                   backgroundColor: const Color(0xFF1E1E1E),
                   onPressed: () {
-                    _getCurrentLocation();
+                    _forceUpdateLocation();
-                    if (_userLocation != null) {
-                      _centerMap(_userLocation!, zoom: 15.0);
-                    }
                   },
                   child: const Icon(Icons.my_location, color: Colors.white),
                 ),

lib/screens/settings_screen.dart

@@ -5,6 +5,7 @@ import 'dart:io';
 import 'package:lbjconsole/models/merged_record.dart';
 import 'package:lbjconsole/services/database_service.dart';
 import 'package:lbjconsole/services/ble_service.dart';
+import 'package:lbjconsole/services/background_service.dart';
 import 'package:lbjconsole/themes/app_theme.dart';
 import 'package:url_launcher/url_launcher.dart';
 
@@ -196,11 +197,17 @@ class _SettingsScreenState extends State<SettingsScreen> {
                 ),
                 Switch(
                   value: _backgroundServiceEnabled,
-                  onChanged: (value) {
+                  onChanged: (value) async {
                     setState(() {
                       _backgroundServiceEnabled = value;
                     });
-                    _saveSettings();
+                    await _saveSettings();
+
+                    if (value) {
+                      await BackgroundService.startService();
+                    } else {
+                      await BackgroundService.stopService();
+                    }
                   },
                   activeColor: Theme.of(context).colorScheme.primary,
                 ),
@@ -388,9 +395,9 @@ class _SettingsScreenState extends State<SettingsScreen> {
           children: [
             Row(
               children: [
-                Icon(Icons.share, color: Theme.of(context).colorScheme.primary),
+                Icon(Icons.storage, color: Theme.of(context).colorScheme.primary),
                 const SizedBox(width: 12),
-                Text('数据分享', style: AppTheme.titleMedium),
+                Text('数据管理', style: AppTheme.titleMedium),
               ],
             ),
             const SizedBox(height: 16),
@@ -503,8 +510,6 @@ class _SettingsScreenState extends State<SettingsScreen> {
     }
   }
 
-
-
   Future<void> _shareData() async {
     final scaffoldMessenger = ScaffoldMessenger.of(context);
 
@@ -735,7 +740,8 @@ class _SettingsScreenState extends State<SettingsScreen> {
                 if (snapshot.hasData) {
                   return Text(snapshot.data!, style: AppTheme.bodyMedium);
                 } else {
-                  return const Text('v0.1.3-flutter', style: AppTheme.bodyMedium);
+                  return const Text('v0.1.3-flutter',
+                      style: AppTheme.bodyMedium);
                 }
               },
             ),

lib/services/background_service.dart

@@ -0,0 +1,211 @@
+import 'dart:async';
+import 'dart:io';
+import 'dart:ui';
+
+import 'package:flutter_background_service/flutter_background_service.dart';
+import 'package:flutter_background_service_android/flutter_background_service_android.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:lbjconsole/services/ble_service.dart';
+
+const String _notificationChannelId = 'lbj_console_channel';
+const String _notificationChannelName = 'LBJ Console 后台服务';
+const String _notificationChannelDescription = '保持蓝牙连接稳定';
+const int _notificationId = 114514;
+
+class BackgroundService {
+  static final FlutterBackgroundService _service = FlutterBackgroundService();
+  static bool _isInitialized = false;
+
+  static Future<void> initialize() async {
+    if (_isInitialized) return;
+
+    final service = FlutterBackgroundService();
+    
+    final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
+    
+    if (Platform.isAndroid) {
+      const AndroidNotificationChannel channel = AndroidNotificationChannel(
+        _notificationChannelId,
+        _notificationChannelName,
+        description: _notificationChannelDescription,
+        importance: Importance.low,
+        enableLights: false,
+        enableVibration: false,
+        playSound: false,
+      );
+
+      await flutterLocalNotificationsPlugin.resolvePlatformSpecificImplementation<
+          AndroidFlutterLocalNotificationsPlugin>()?.createNotificationChannel(channel);
+    }
+    
+    await service.configure(
+      androidConfiguration: AndroidConfiguration(
+        onStart: _onStart,
+        autoStart: true,
+        isForegroundMode: true,
+        notificationChannelId: _notificationChannelId,
+        initialNotificationTitle: 'LBJ Console',
+        initialNotificationContent: '蓝牙连接监控中',
+        foregroundServiceNotificationId: _notificationId,
+      ),
+      iosConfiguration: IosConfiguration(
+        autoStart: true,
+        onForeground: _onStart,
+        onBackground: _onIosBackground,
+      ),
+    );
+
+    _isInitialized = true;
+  }
+
+  @pragma('vm:entry-point')
+  static void _onStart(ServiceInstance service) async {
+    DartPluginRegistrant.ensureInitialized();
+
+    if (service is AndroidServiceInstance) {
+      service.on('setAsForeground').listen((event) {
+        service.setAsForegroundService();
+      });
+
+      service.on('setAsBackground').listen((event) {
+        service.setAsBackgroundService();
+      });
+    }
+
+    service.on('stopService').listen((event) {
+      service.stopSelf();
+    });
+
+    BLEService().initialize();
+
+    if (service is AndroidServiceInstance) {
+      await Future.delayed(const Duration(seconds: 1));
+      if (await service.isForegroundService()) {
+        final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
+        
+        try {
+          const AndroidNotificationChannel channel = AndroidNotificationChannel(
+            _notificationChannelId,
+            _notificationChannelName,
+            description: _notificationChannelDescription,
+            importance: Importance.low,
+            enableLights: false,
+            enableVibration: false,
+            playSound: false,
+          );
+
+          await flutterLocalNotificationsPlugin.resolvePlatformSpecificImplementation<
+              AndroidFlutterLocalNotificationsPlugin>()?.createNotificationChannel(channel);
+
+          await flutterLocalNotificationsPlugin.show(
+            _notificationId,
+            'LBJ Console',
+            '蓝牙连接监控中',
+            NotificationDetails(
+              android: AndroidNotificationDetails(
+                _notificationChannelId,
+                _notificationChannelName,
+                channelDescription: _notificationChannelDescription,
+                icon: '@mipmap/ic_launcher',
+                ongoing: true,
+                autoCancel: false,
+                importance: Importance.low,
+                priority: Priority.low,
+                enableLights: false,
+                enableVibration: false,
+                playSound: false,
+                onlyAlertOnce: true,
+                setAsGroupSummary: false,
+                groupKey: 'lbj_console_group',
+                visibility: NotificationVisibility.public,
+                category: AndroidNotificationCategory.service,
+              ),
+            ),
+          );
+          print('前台服务通知显示成功');
+        } catch (e) {
+          print('前台服务通知显示失败: $e');
+        }
+      }
+    }
+
+    Timer.periodic(const Duration(seconds: 30), (timer) async {
+      if (service is AndroidServiceInstance) {
+        if (await service.isForegroundService()) {
+          try {
+            final bleService = BLEService();
+            final isConnected = bleService.isConnected;
+            final deviceStatus = bleService.deviceStatus;
+            
+            final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
+            await flutterLocalNotificationsPlugin.show(
+              _notificationId,
+              'LBJ Console',
+              isConnected ? '蓝牙已连接 - $deviceStatus' : '蓝牙未连接 - 自动重连中',
+              NotificationDetails(
+                android: AndroidNotificationDetails(
+                  _notificationChannelId,
+                  _notificationChannelName,
+                  channelDescription: _notificationChannelDescription,
+                  icon: '@mipmap/ic_launcher',
+                  ongoing: true,
+                  autoCancel: false,
+                  importance: Importance.low,
+                  priority: Priority.low,
+                  enableLights: false,
+                  enableVibration: false,
+                  playSound: false,
+                  onlyAlertOnce: true,
+                  setAsGroupSummary: false,
+                  groupKey: 'lbj_console_group',
+                  visibility: NotificationVisibility.public,
+                  category: AndroidNotificationCategory.service,
+                ),
+              ),
+            );
+          } catch (e) {
+            print('前台服务通知更新失败: $e');
+          }
+        }
+      }
+    });
+  }
+
+  @pragma('vm:entry-point')
+  static Future<bool> _onIosBackground(ServiceInstance service) async {
+    return true;
+  }
+
+  static Future<void> startService() async {
+    await initialize();
+    final service = FlutterBackgroundService();
+    
+    if (Platform.isAndroid) {
+      final isRunning = await service.isRunning();
+      if (!isRunning) {
+        service.startService();
+      }
+    } else if (Platform.isIOS) {
+      service.startService();
+    }
+  }
+
+  static Future<void> stopService() async {
+    final service = FlutterBackgroundService();
+    service.invoke('stopService');
+  }
+
+  static Future<bool> isRunning() async {
+    final service = FlutterBackgroundService();
+    return await service.isRunning();
+  }
+
+  static void setForegroundMode(bool isForeground) {
+    final service = FlutterBackgroundService();
+    if (isForeground) {
+      service.invoke('setAsForeground');
+    } else {
+      service.invoke('setAsBackground');
+    }
+  }
+}

lib/services/ble_service.dart

@@ -27,14 +27,19 @@ class BLEService {
       StreamController<TrainRecord>.broadcast();
   final StreamController<bool> _connectionController =
       StreamController<bool>.broadcast();
+  final StreamController<DateTime?> _lastReceivedTimeController =
+      StreamController<DateTime?>.broadcast();
 
   Stream<String> get statusStream => _statusController.stream;
   Stream<TrainRecord> get dataStream => _dataController.stream;
   Stream<bool> get connectionStream => _connectionController.stream;
+  Stream<DateTime?> get lastReceivedTimeStream =>
+      _lastReceivedTimeController.stream;
 
   String _deviceStatus = "未连接";
   String? _lastKnownDeviceAddress;
   String _targetDeviceName = "LBJReceiver";
+  DateTime? _lastReceivedTime;
 
   bool _isConnecting = false;
   bool _isManualDisconnect = false;
@@ -69,8 +74,7 @@ class BLEService {
       if (settings != null) {
         _targetDeviceName = settings['deviceName'] ?? 'LBJReceiver';
       }
-    } catch (e) {
+    } catch (e) {}
-    }
   }
 
   void ensureConnection() {
@@ -315,6 +319,9 @@ class BLEService {
             '${now.millisecondsSinceEpoch}_${Random().nextInt(9999)}';
         recordData['receivedTimestamp'] = now.millisecondsSinceEpoch;
 
+        _lastReceivedTime = now;
+        _lastReceivedTimeController.add(_lastReceivedTime);
+
         final trainRecord = TrainRecord.fromJson(recordData);
         _dataController.add(trainRecord);
         DatabaseService.instance.insertRecord(trainRecord);
@@ -331,6 +338,8 @@ class BLEService {
       _deviceStatus = status;
       _connectedDevice = null;
       _characteristic = null;
+      _lastReceivedTime = null;
+      _lastReceivedTimeController.add(null);
     }
     _statusController.add(_deviceStatus);
     _connectionController.add(connected);
@@ -357,5 +366,6 @@ class BLEService {
     _statusController.close();
     _dataController.close();
     _connectionController.close();
+    _lastReceivedTimeController.close();
   }
 }

lib/services/map_state_service.dart

@@ -0,0 +1,113 @@
+import 'dart:convert';
+import 'package:sqflite/sqflite.dart';
+import 'package:lbjconsole/models/map_state.dart';
+import 'database_service.dart';
+
+class MapStateService {
+  static final MapStateService instance = MapStateService._internal();
+  factory MapStateService() => instance;
+  MapStateService._internal();
+
+  static const String _tableName = 'record_map_states';
+  
+  final Map<String, MapState> _memoryCache = {};
+
+  Future<void> _ensureTableExists() async {
+    final db = await DatabaseService.instance.database;
+    await db.execute('''
+      CREATE TABLE IF NOT EXISTS $_tableName (
+        key TEXT PRIMARY KEY,
+        state TEXT NOT NULL,
+        updated_at INTEGER NOT NULL
+      )
+    ''');
+  }
+
+  String getSingleRecordMapKey(String recordId) {
+    return "${recordId}_record_map";
+  }
+
+  String getMergedRecordMapKey(String groupKey) {
+    return "${groupKey}_group_map";
+  }
+
+  Future<void> saveMapState(String key, MapState state) async {
+    try {
+      _memoryCache[key] = state;
+      
+      final db = await DatabaseService.instance.database;
+      await _ensureTableExists();
+      
+      await db.insert(
+        _tableName,
+        {
+          'key': key,
+          'state': jsonEncode(state.toJson()),
+          'updated_at': DateTime.now().millisecondsSinceEpoch,
+        },
+        conflictAlgorithm: ConflictAlgorithm.replace,
+      );
+    } catch (e) {
+      print('保存地图状态失败: $e');
+    }
+  }
+
+  Future<MapState?> getMapState(String key) async {
+    if (_memoryCache.containsKey(key)) {
+      return _memoryCache[key];
+    }
+
+    try {
+      final db = await DatabaseService.instance.database;
+      await _ensureTableExists();
+      
+      final result = await db.query(
+        _tableName,
+        where: 'key = ?',
+        whereArgs: [key],
+        limit: 1,
+      );
+
+      if (result.isNotEmpty) {
+        final stateJson = jsonDecode(result.first['state'] as String);
+        final state = MapState.fromJson(stateJson);
+        _memoryCache[key] = state;
+        return state;
+      }
+    } catch (e) {
+      print('读取地图状态失败: $e');
+    }
+    
+    return null;
+  }
+
+  Future<void> deleteMapState(String key) async {
+    _memoryCache.remove(key);
+    
+    try {
+      final db = await DatabaseService.instance.database;
+      await db.delete(
+        _tableName,
+        where: 'key = ?',
+        whereArgs: [key],
+      );
+    } catch (e) {
+      print('删除地图状态失败: $e');
+    }
+  }
+
+  Future<void> clearAllMapStates() async {
+    _memoryCache.clear();
+    
+    try {
+      final db = await DatabaseService.instance.database;
+      await db.delete(_tableName);
+    } catch (e) {
+      print('清空地图状态失败: $e');
+    }
+  }
+
+  void clearMemoryCache() {
+    _memoryCache.clear();
+  }
+}

lib/services/notification_service.dart

@@ -61,7 +61,7 @@ class NotificationService {
       return;
     }
 
-    final String title = '列车信息更新';
+    final String title = '列车信息';
     final String body = _buildNotificationContent(record);
 
     final AndroidNotificationDetails androidPlatformChannelSpecifics =

macos/Runner/Configs/AppInfo.xcconfig

@@ -5,7 +5,7 @@
 // 'flutter create' template.
 
 // The application's name. By default this is also the title of the Flutter window.
-PRODUCT_NAME = lbjconsole
+PRODUCT_NAME = LBJ Console
 
 // The application's bundle identifier
 PRODUCT_BUNDLE_IDENTIFIER = org.noxylva.lbjconsole

pubspec.lock

@@ -278,6 +278,38 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_background_service:
+    dependency: "direct main"
+    description:
+      name: flutter_background_service
+      sha256: "70a1c185b1fa1a44f8f14ecd6c86f6e50366e3562f00b2fa5a54df39b3324d3d"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "5.1.0"
+  flutter_background_service_android:
+    dependency: transitive
+    description:
+      name: flutter_background_service_android
+      sha256: ca0793d4cd19f1e194a130918401a3d0b1076c81236f7273458ae96987944a87
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "6.3.1"
+  flutter_background_service_ios:
+    dependency: transitive
+    description:
+      name: flutter_background_service_ios
+      sha256: "6037ffd45c4d019dab0975c7feb1d31012dd697e25edc05505a4a9b0c7dc9fba"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "5.0.3"
+  flutter_background_service_platform_interface:
+    dependency: transitive
+    description:
+      name: flutter_background_service_platform_interface
+      sha256: ca74aa95789a8304f4d3f57f07ba404faa86bed6e415f83e8edea6ad8b904a41
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "5.1.2"
   flutter_blue_plus:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 0.1.5-flutter
+version: 0.2.0-flutter+20  # versionName: 0.2.0-flutter, versionCode: 3
 
 environment:
   sdk: ^3.5.4
@@ -52,6 +52,7 @@ dependencies:
   file_picker: ^8.1.2
   package_info_plus: ^8.1.2
   msix: ^3.16.12
+  flutter_background_service: ^5.1.0
 
 dev_dependencies:
   flutter_test: