fix: solve the problem that errors may occur during merging

.gitattributes

@@ -0,0 +1 @@
+assets/* linguist-vendored

README.md

@@ -3,15 +3,16 @@
 LBJ Console 是一款应用程序，用于通过 BLE 从 [SX1276_Receive_LBJ](https://github.com/undef-i/SX1276_Receive_LBJ) 设备接收并显示列车预警消息，功能包括：
 
 - 接收列车预警消息，支持可选的手机推送通知。
+- 监控指定列车的轨迹，在地图上显示。
 - 在地图上显示预警消息的 GPS 信息。
 - 基于内置数据文件显示机车配属，机车类型和车次类型。
 
 [android](https://github.com/undef-i/LBJ_Console/tree/android) 分支包含项目早期基于 Android 平台的实现代码，已实现基本功能，现已停止开发。
 
-
 ## 数据文件
 
 LBJ Console 依赖以下数据文件，位于 `assets` 目录，用于支持机车配属和车次信息的展示：
+
 - `loco_info.csv`：包含机车配属信息，格式为 `机车型号,机车编号起始值,机车编号结束值,所属铁路局及机务段,备注`。
 - `loco_type_info.csv`：包含机车类型编码信息，格式为 `机车类型编码前缀,机车类型`。
 - `train_info.csv`：包含车次类型信息，格式为 `正则表达式,车次类型`。

lib/screens/history_screen.dart

@@ -1,9 +1,7 @@
 import 'dart:math' as math;
 import 'dart:isolate';
 import 'dart:async';
-import 'dart:convert';
 import 'package:flutter/material.dart';
-import 'package:flutter/scheduler.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:latlong2/latlong.dart';
 import 'package:geolocator/geolocator.dart';
@@ -33,6 +31,10 @@ class HistoryScreenState extends State<HistoryScreen> {
   final List<Object> _displayItems = [];
   bool _isLoading = true;
   bool _isEditMode = false;
+  int? _anchorIndex;
+  double? _anchorOffset;
+  double? _oldCardHeight;
+  double? _oldScrollOffset;
   final Set<String> _selectedRecords = {};
   final Map<String, bool> _expandedStates = {};
   final ScrollController _scrollController = ScrollController();
@@ -41,7 +43,6 @@ class HistoryScreenState extends State<HistoryScreen> {
   late final ChatScrollObserver _chatObserver;
   bool _isAtTop = true;
   MergeSettings _mergeSettings = MergeSettings();
-  double _itemHeightCache = 0.0;
 
   final Map<String, double> _mapOptimalZoom = {};
   final Map<String, bool> _mapCalculating = {};
@@ -74,15 +75,21 @@ class HistoryScreenState extends State<HistoryScreen> {
     super.initState();
     _chatObserver = ChatScrollObserver(_observerController)
       ..toRebuildScrollViewCallback = () {
+        if (mounted) {
           setState(() {});
+        }
       };
     _scrollController.addListener(() {
       if (_scrollController.position.atEdge) {
         if (_scrollController.position.pixels == 0) {
-          if (!_isAtTop) setState(() => _isAtTop = true);
+          if (!_isAtTop) {
+            setState(() => _isAtTop = true);
+          }
         }
       } else {
-        if (_isAtTop) setState(() => _isAtTop = false);
+        if (_isAtTop) {
+          setState(() => _isAtTop = false);
+        }
       }
     });
     WidgetsBinding.instance.addPostFrameCallback((_) {
@@ -109,17 +116,19 @@ class HistoryScreenState extends State<HistoryScreen> {
 
       List<TrainRecord> filteredRecords = allRecords;
       if ((settingsMap['hideTimeOnlyRecords'] ?? 0) == 1) {
-        int hiddenCount = 0;
-        int shownCount = 0;
-
         filteredRecords = allRecords.where((record) {
           bool isFieldMeaningful(String field) {
-            if (field.isEmpty) return false;
+            if (field.isEmpty) {
-            String cleaned = field.replaceAll('<NUL>', '').trim();
-            if (cleaned.isEmpty) return false;
-            if (cleaned.runes
-                .every((r) => r == '*'.runes.first || r == ' '.runes.first))
               return false;
+            }
+            String cleaned = field.replaceAll('<NUL>', '').trim();
+            if (cleaned.isEmpty) {
+              return false;
+            }
+            if (cleaned.runes
+                .every((r) => r == '*'.runes.first || r == ' '.runes.first)) {
+              return false;
+            }
             return true;
           }
 
@@ -160,12 +169,6 @@ class HistoryScreenState extends State<HistoryScreen> {
               hasLbjClass ||
               hasTrain;
 
-          if (!shouldShow) {
-            hiddenCount++;
-          } else {
-            shownCount++;
-          }
-
           return shouldShow;
         }).toList();
       }
@@ -192,7 +195,9 @@ class HistoryScreenState extends State<HistoryScreen> {
         }
       }
     } catch (e) {
-      if (mounted) setState(() => _isLoading = false);
+      if (mounted) {
+        setState(() => _isLoading = false);
+      }
     }
   }
 
@@ -201,57 +206,7 @@ class HistoryScreenState extends State<HistoryScreen> {
       final settingsMap = await DatabaseService.instance.getAllSettings() ?? {};
       _mergeSettings = MergeSettings.fromMap(settingsMap);
 
-      if ((settingsMap['hideTimeOnlyRecords'] ?? 0) == 1) {
+      if ((settingsMap['hideTimeOnlyRecords'] ?? 0) == 1) {}
-        bool isFieldMeaningful(String field) {
-          if (field.isEmpty) return false;
-          String cleaned = field.replaceAll('<NUL>', '').trim();
-          if (cleaned.isEmpty) return false;
-          if (cleaned.runes
-              .every((r) => r == '*'.runes.first || r == ' '.runes.first))
-            return false;
-          return true;
-        }
-
-        final hasTrainNumber = isFieldMeaningful(newRecord.fullTrainNumber) &&
-            !newRecord.fullTrainNumber.contains("-----");
-
-        final hasDirection =
-            newRecord.direction == 1 || newRecord.direction == 3;
-
-        final hasLocoInfo = isFieldMeaningful(newRecord.locoType) ||
-            isFieldMeaningful(newRecord.loco);
-
-        final hasRoute = isFieldMeaningful(newRecord.route);
-
-        final hasPosition = isFieldMeaningful(newRecord.position);
-
-        final hasSpeed =
-            isFieldMeaningful(newRecord.speed) && newRecord.speed != "NUL";
-
-        final hasPositionInfo = isFieldMeaningful(newRecord.positionInfo);
-
-        final hasTrainType = isFieldMeaningful(newRecord.trainType) &&
-            newRecord.trainType != "未知";
-
-        final hasLbjClass =
-            isFieldMeaningful(newRecord.lbjClass) && newRecord.lbjClass != "NA";
-
-        final hasTrain = isFieldMeaningful(newRecord.train) &&
-            !newRecord.train.contains("-----");
-
-        if (!hasTrainNumber &&
-            !hasDirection &&
-            !hasLocoInfo &&
-            !hasRoute &&
-            !hasPosition &&
-            !hasSpeed &&
-            !hasPositionInfo &&
-            !hasTrainType &&
-            !hasLbjClass &&
-            !hasTrain) {
-          return;
-        }
-      }
 
       final isNewRecord = !_displayItems.any((item) {
         if (item is TrainRecord) {
@@ -261,32 +216,147 @@ class HistoryScreenState extends State<HistoryScreen> {
         }
         return false;
       });
-
       if (!isNewRecord) return;
 
-      final allRecords = await DatabaseService.instance.getAllRecords();
-      final items = MergeService.getMixedList(allRecords, _mergeSettings);
-
       if (mounted) {
-        if (!_isAtTop) {
+        if (_isAtTop) {
-          _chatObserver.standby();
-        }
-
-        final hasDataChanged = _hasDataChanged(items);
-        if (hasDataChanged) {
           setState(() {
-            _displayItems.clear();
+            List<TrainRecord> allRecords = [];
-            _displayItems.addAll(items);
+            Set<String> selectedRecordIds = {};
-          });
+
+            for (final item in _displayItems) {
+              if (item is MergedTrainRecord) {
+                allRecords.addAll(item.records);
+                if (_selectedRecords.contains(item.records.first.uniqueId)) {
+                  selectedRecordIds.addAll(item.records.map((r) => r.uniqueId));
+                }
+              } else if (item is TrainRecord) {
+                allRecords.add(item);
+                if (_selectedRecords.contains(item.uniqueId)) {
+                  selectedRecordIds.add(item.uniqueId);
+                }
+              }
             }
 
-        if (_isAtTop && _scrollController.hasClients) {
+            allRecords.insert(0, newRecord);
+
+            final mergedItems =
+                MergeService.getMixedList(allRecords, _mergeSettings);
+
+            _displayItems.clear();
+            _displayItems.addAll(mergedItems);
+
+            _selectedRecords.clear();
+            for (final item in _displayItems) {
+              if (item is MergedTrainRecord) {
+                if (item.records
+                    .any((r) => selectedRecordIds.contains(r.uniqueId))) {
+                  _selectedRecords.addAll(item.records.map((r) => r.uniqueId));
+                }
+              } else if (item is TrainRecord) {
+                if (selectedRecordIds.contains(item.uniqueId)) {
+                  _selectedRecords.add(item.uniqueId);
+                }
+              }
+            }
+          });
+          if (_scrollController.hasClients) {
             _scrollController.jumpTo(0.0);
           }
+          return;
+        }
+
+        final anchorModel = _observerController.observeFirstItem();
+        if (anchorModel == null) {
+          return;
+        }
+
+        _anchorIndex = anchorModel.index;
+        if (_anchorIndex! > 0) {
+          _anchorOffset = anchorModel.layoutOffset;
+        } else {
+          _oldCardHeight = anchorModel.size.height;
+          _oldScrollOffset = _scrollController.offset;
+        }
+
+        bool isMerge = false;
+        Object? mergeResult;
+        final firstItem = _displayItems.first;
+        List<TrainRecord> tempRecords = [newRecord];
+        if (firstItem is MergedTrainRecord) {
+          tempRecords.addAll(firstItem.records);
+        } else if (firstItem is TrainRecord) {
+          tempRecords.add(firstItem);
+        }
+        final mergeCheckResult =
+            MergeService.getMixedList(tempRecords, _mergeSettings);
+        if (mergeCheckResult.length == 1 &&
+            mergeCheckResult.first is MergedTrainRecord) {
+          isMerge = true;
+          mergeResult = mergeCheckResult.first;
+        }
+
+        setState(() {
+          if (isMerge) {
+            _displayItems[0] = mergeResult!;
+          } else {
+            _displayItems.insert(0, newRecord);
+          }
+        });
+
+        WidgetsBinding.instance.addPostFrameCallback((_) {
+          if (!mounted || _anchorIndex == null) return;
+
+          if (_anchorIndex! > 0) {
+            final newAnchorIndex = isMerge ? _anchorIndex! : _anchorIndex! + 1;
+            final newAnchorModel =
+                _observerController.observeItem(index: newAnchorIndex);
+            if (newAnchorModel != null && _anchorOffset != null) {
+              final newOffset = newAnchorModel.layoutOffset;
+              final delta = newOffset - _anchorOffset!;
+              if (delta.abs() > 0.1) {
+                _scrollController.jumpTo(_scrollController.offset + delta);
+              }
+            }
+          } else {
+            final newAnchorModel = _observerController.observeItem(index: 0);
+            if (newAnchorModel != null &&
+                _oldCardHeight != null &&
+                _oldScrollOffset != null) {
+              final newHeight = newAnchorModel.size.height;
+              final heightDelta = newHeight - _oldCardHeight!;
+              if (heightDelta.abs() > 0.1) {
+                _scrollController.jumpTo(_oldScrollOffset! + heightDelta);
+              }
+            }
+          }
+
+          _anchorIndex = null;
+          _anchorOffset = null;
+          _oldCardHeight = null;
+          _oldScrollOffset = null;
+        });
       }
     } catch (e) {}
   }
 
+  String _getGroupKeyForRecord(TrainRecord record, MergeSettings settings) {
+    switch (settings.groupBy) {
+      case GroupBy.trainOnly:
+        return record.train.trim();
+      case GroupBy.locoOnly:
+        return record.loco.trim();
+      case GroupBy.trainAndLoco:
+        return '${record.train.trim()}-${record.loco.trim()}';
+      case GroupBy.trainOrLoco:
+        final train = record.train.trim();
+        if (train.isNotEmpty) return train;
+        final loco = record.loco.trim();
+        if (loco.isNotEmpty) return loco;
+        return '';
+    }
+  }
+
   bool _hasDataChanged(List<Object> newItems) {
     if (_displayItems.length != newItems.length) return true;
 
@@ -303,7 +373,6 @@ class HistoryScreenState extends State<HistoryScreen> {
         if (oldItem.records.length != newItem.records.length) return true;
       }
     }
-
     return false;
   }
 
@@ -346,6 +415,7 @@ class HistoryScreenState extends State<HistoryScreen> {
         mergedRecord.records.any((r) => _selectedRecords.contains(r.uniqueId));
     final isExpanded = _expandedStates[mergedRecord.groupKey] ?? false;
     return Card(
+        key: ValueKey(mergedRecord.groupKey),
         color: isSelected && _isEditMode
             ? const Color(0xFF2E2E2E)
             : const Color(0xFF1E1E1E),
@@ -389,7 +459,9 @@ class HistoryScreenState extends State<HistoryScreen> {
               }
             },
             onLongPress: () {
-              if (!_isEditMode) setEditMode(true);
+              if (!_isEditMode) {
+                setEditMode(true);
+              }
               setState(() {
                 final allIdsInGroup =
                     mergedRecord.records.map((r) => r.uniqueId).toSet();
@@ -488,10 +560,8 @@ class HistoryScreenState extends State<HistoryScreen> {
       TrainRecord record, TrainRecord latest, GroupBy groupBy) {
     final train = record.train.trim();
     final loco = record.loco.trim();
-    final locoType = record.locoType.trim();
     final latestTrain = latest.train.trim();
     final latestLoco = latest.loco.trim();
-    final latestLocoType = latest.locoType.trim();
 
     switch (groupBy) {
       case GroupBy.trainOnly:
@@ -530,77 +600,14 @@ 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>")
+    if (record.route.isNotEmpty && record.route != "<NUL>") {
       parts.add(record.route);
-    if (record.direction != 0) parts.add(record.direction == 1 ? "下" : "上");
+    }
+    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('.')
@@ -616,7 +623,9 @@ class HistoryScreenState extends State<HistoryScreen> {
         .map((record) => _parsePosition(record.positionInfo))
         .whereType<LatLng>()
         .toList();
-    if (positions.isEmpty) return const SizedBox.shrink();
+    if (positions.isEmpty) {
+      return const SizedBox.shrink();
+    }
 
     final mapId = records.map((r) => r.uniqueId).join('_');
     final bounds = LatLngBounds.fromPoints(positions);
@@ -674,12 +683,6 @@ class HistoryScreenState extends State<HistoryScreen> {
     ]);
   }
 
-  double _getDefaultZoom(List<LatLng> positions) {
-    if (positions.length == 1) return 15.0;
-    if (positions.length < 10) return 12.0;
-    return 10.0;
-  }
-
   Future<void> _requestLocationPermission() async {
     bool serviceEnabled = await Geolocator.isLocationServiceEnabled();
     if (!serviceEnabled) {
@@ -695,23 +698,30 @@ class HistoryScreenState extends State<HistoryScreen> {
       return;
     }
 
+    if (mounted) {
       setState(() {
         _isLocationPermissionGranted = true;
       });
+    }
 
     _getCurrentLocation();
   }
 
   Future<void> _getCurrentLocation() async {
     try {
+      final locationSettings = AndroidSettings(
+        accuracy: LocationAccuracy.high,
+        forceLocationManager: true,
+      );
       Position position = await Geolocator.getCurrentPosition(
-        desiredAccuracy: LocationAccuracy.high,
+        locationSettings: locationSettings,
-        forceAndroidLocationManager: true,
       );
 
+      if (mounted) {
         setState(() {
           _currentUserLocation = LatLng(position.latitude, position.longitude);
         });
+      }
     } catch (e) {}
   }
 
@@ -728,13 +738,9 @@ class HistoryScreenState extends State<HistoryScreen> {
   Widget _buildRecordCard(TrainRecord record,
       {bool isSubCard = false, Key? key}) {
     final isSelected = _selectedRecords.contains(record.uniqueId);
-    final isExpanded =
-        !isSubCard && (_expandedStates[record.uniqueId] ?? false);
 
-    final GlobalKey itemKey = GlobalKey();
+    return Card(
-
+        key: key,
-    final Widget card = Card(
-        key: key ?? itemKey,
         color: isSelected && _isEditMode
             ? const Color(0xFF2E2E2E)
             : const Color(0xFF1E1E1E),
@@ -759,10 +765,17 @@ class HistoryScreenState extends State<HistoryScreen> {
                   }
                   widget.onSelectionChanged();
                 });
+              } else {
+                setState(() {
+                  _expandedStates[record.uniqueId] =
+                      !(_expandedStates[record.uniqueId] ?? false);
+                });
               }
             },
             onLongPress: () {
-              if (!_isEditMode) setEditMode(true);
+              if (!_isEditMode) {
+                setEditMode(true);
+              }
               setState(() {
                 _selectedRecords.add(record.uniqueId);
                 widget.onSelectionChanged();
@@ -776,23 +789,9 @@ class HistoryScreenState extends State<HistoryScreen> {
                       _buildRecordHeader(record),
                       _buildPositionAndSpeed(record),
                       _buildLocoInfo(record),
-                      if (isExpanded) _buildExpandedContent(record),
+                      if (_expandedStates[record.uniqueId] ?? false)
+                        _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}) {
@@ -823,6 +822,7 @@ class HistoryScreenState extends State<HistoryScreen> {
     final hasLocoInfo =
         formattedLocoInfo.isNotEmpty && formattedLocoInfo != "<NUL>";
     final shouldShowTrainRow = hasTrainNumber || hasDirection || hasLocoInfo;
+    final hasPosition = _parsePosition(record.positionInfo) != null;
 
     return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
       Row(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
@@ -876,7 +876,8 @@ class HistoryScreenState extends State<HistoryScreen> {
                   ])),
               if (hasLocoInfo)
                 Text(formattedLocoInfo,
-                    style: const TextStyle(fontSize: 14, color: Colors.white70))
+                    style:
+                        const TextStyle(fontSize: 14, color: Colors.white70)),
             ]),
         const SizedBox(height: 2)
       ]
@@ -885,7 +886,9 @@ class HistoryScreenState extends State<HistoryScreen> {
 
   Widget _buildLocoInfo(TrainRecord record) {
     final locoInfo = record.locoInfo;
-    if (locoInfo == null || locoInfo.isEmpty) return const SizedBox.shrink();
+    if (locoInfo == null || locoInfo.isEmpty) {
+      return const SizedBox.shrink();
+    }
     return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
       const SizedBox(height: 4),
       Text(locoInfo,
@@ -910,8 +913,9 @@ class HistoryScreenState extends State<HistoryScreen> {
             .every((r) => r == '*'.runes.first || r == '-'.runes.first) &&
         speed != "NUL" &&
         speed != "<NUL>";
-    if (!isValidRoute && !isValidPosition && !isValidSpeed)
+    if (!isValidRoute && !isValidPosition && !isValidSpeed) {
       return const SizedBox.shrink();
+    }
     return Padding(
         padding: const EdgeInsets.only(top: 4.0),
         child:
@@ -1002,8 +1006,11 @@ class HistoryScreenState extends State<HistoryScreen> {
   }
 
   LatLng? _parsePosition(String? positionInfo) {
-    if (positionInfo == null || positionInfo.isEmpty || positionInfo == '<NUL>')
+    if (positionInfo == null ||
+        positionInfo.isEmpty ||
+        positionInfo == '<NUL>') {
       return null;
+    }
     try {
       final parts = positionInfo.trim().split(RegExp(r'\s+'));
       if (parts.length >= 2) {
@@ -1022,14 +1029,22 @@ class HistoryScreenState extends State<HistoryScreen> {
   double? _parseDmsCoordinate(String dmsStr) {
     try {
       final degreeIndex = dmsStr.indexOf('°');
-      if (degreeIndex == -1) return null;
+      if (degreeIndex == -1) {
+        return null;
+      }
       final degrees = double.tryParse(dmsStr.substring(0, degreeIndex));
-      if (degrees == null) return null;
+      if (degrees == null) {
+        return null;
+      }
       final minuteIndex = dmsStr.indexOf('′');
-      if (minuteIndex == -1) return degrees;
+      if (minuteIndex == -1) {
+        return degrees;
+      }
       final minutes =
           double.tryParse(dmsStr.substring(degreeIndex + 1, minuteIndex));
-      if (minutes == null) return degrees;
+      if (minutes == null) {
+        return degrees;
+      }
       return degrees + (minutes / 60.0);
     } catch (e) {
       return null;
@@ -1140,12 +1155,12 @@ class _DelayedMapWithMarker extends StatefulWidget {
   final LatLng? currentUserLocation;
 
   const _DelayedMapWithMarker({
-    Key? key,
+    super.key,
     required this.position,
     required this.zoom,
     required this.recordId,
     this.currentUserLocation,
-  }) : super(key: key);
+  });
 
   @override
   State<_DelayedMapWithMarker> createState() => _DelayedMapWithMarkerState();
@@ -1175,13 +1190,17 @@ class _DelayedMapWithMarkerState extends State<_DelayedMapWithMarker> {
         _mapController.rotate(savedState.bearing);
       }
     }
+    if (mounted) {
       setState(() {
         _isInitializing = false;
       });
     }
+  }
 
   void _onCameraMove() {
-    if (_isInitializing) return;
+    if (_isInitializing) {
+      return;
+    }
 
     final camera = _mapController.camera;
     final state = MapState(
@@ -1280,13 +1299,13 @@ class _DelayedMultiMarkerMap extends StatefulWidget {
   final LatLng? currentUserLocation;
 
   const _DelayedMultiMarkerMap({
-    Key? key,
+    super.key,
     required this.positions,
     required this.center,
     required this.zoom,
     required this.groupKey,
     this.currentUserLocation,
-  }) : super(key: key);
+  });
 
   @override
   State<_DelayedMultiMarkerMap> createState() => _DelayedMultiMarkerMapState();
@@ -1318,13 +1337,17 @@ class _DelayedMultiMarkerMapState extends State<_DelayedMultiMarkerMap> {
     } else if (mounted) {
       _mapController.move(widget.center, widget.zoom);
     }
+    if (mounted) {
       setState(() {
         _isInitializing = false;
       });
     }
+  }
 
   void _onCameraMove() {
-    if (_isInitializing) return;
+    if (_isInitializing) {
+      return;
+    }
 
     final camera = _mapController.camera;
     final state = MapState(
@@ -1352,7 +1375,7 @@ class _DelayedMultiMarkerMapState extends State<_DelayedMultiMarkerMap> {
           height: 24,
           child: Container(
               decoration: BoxDecoration(
-                  color: Colors.red.withOpacity(0.8),
+                  color: Colors.red.withAlpha((255 * 0.8).round()),
                   shape: BoxShape.circle,
                   border: Border.all(color: Colors.white, width: 1.5)),
               child: const Icon(Icons.train, color: Colors.white, size: 12)))),

lib/screens/main_screen.dart

@@ -7,6 +7,7 @@ import 'package:lbjconsole/models/train_record.dart';
 import 'package:lbjconsole/screens/history_screen.dart';
 import 'package:lbjconsole/screens/map_screen.dart';
 import 'package:lbjconsole/screens/map_webview_screen.dart';
+import 'package:lbjconsole/screens/realtime_screen.dart';
 import 'package:lbjconsole/screens/settings_screen.dart';
 import 'package:lbjconsole/services/ble_service.dart';
 import 'package:lbjconsole/services/database_service.dart';
@@ -183,10 +184,13 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
   StreamSubscription? _connectionSubscription;
   StreamSubscription? _dataSubscription;
   StreamSubscription? _lastReceivedTimeSubscription;
+  StreamSubscription? _settingsSubscription;
   DateTime? _lastReceivedTime;
   bool _isHistoryEditMode = false;
   final GlobalKey<HistoryScreenState> _historyScreenKey =
       GlobalKey<HistoryScreenState>();
+  final GlobalKey<RealtimeScreenState> _realtimeScreenKey =
+      GlobalKey<RealtimeScreenState>();
 
   @override
   void initState() {
@@ -197,6 +201,7 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     _initializeServices();
     _checkAndStartBackgroundService();
     _setupLastReceivedTimeListener();
+    _setupSettingsListener();
     _loadMapType();
   }
 
@@ -209,7 +214,6 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     }
   }
 
-
   Future<void> _checkAndStartBackgroundService() async {
     final settings = await DatabaseService.instance.getAllSettings() ?? {};
     final backgroundServiceEnabled =
@@ -231,11 +235,21 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     });
   }
 
+  void _setupSettingsListener() {
+    _settingsSubscription =
+        DatabaseService.instance.onSettingsChanged((settings) {
+      if (mounted && _currentIndex == 1) {
+        _realtimeScreenKey.currentState?.loadRecords(scrollToTop: false);
+      }
+    });
+  }
+
   @override
   void dispose() {
     _connectionSubscription?.cancel();
     _dataSubscription?.cancel();
     _lastReceivedTimeSubscription?.cancel();
+    _settingsSubscription?.cancel();
     WidgetsBinding.instance.removeObserver(this);
     super.dispose();
   }
@@ -256,6 +270,9 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
       if (_historyScreenKey.currentState != null) {
         _historyScreenKey.currentState!.addNewRecord(record);
       }
+      if (_realtimeScreenKey.currentState != null) {
+        _realtimeScreenKey.currentState!.addNewRecord(record);
+      }
     });
   }
 
@@ -302,7 +319,7 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
       backgroundColor: AppTheme.primaryBlack,
       elevation: 0,
       title: Text(
-        ['列车记录', '位置地图', '设置'][_currentIndex],
+        ['列车记录', '数据监控', '位置地图', '设置'][_currentIndex],
         style: const TextStyle(
             color: Colors.white, fontSize: 20, fontWeight: FontWeight.bold),
       ),
@@ -394,6 +411,9 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
         onEditModeChanged: _handleHistoryEditModeChanged,
         onSelectionChanged: _handleSelectionChanged,
       ),
+      RealtimeScreen(
+        key: _realtimeScreenKey,
+      ),
       _mapType == 'map' ? const MapScreen() : const MapWebViewScreen(),
       SettingsScreen(
         onSettingsChanged: () {
@@ -411,14 +431,16 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
       ),
       bottomNavigationBar: NavigationBar(
         backgroundColor: AppTheme.secondaryBlack,
-        indicatorColor: AppTheme.accentBlue.withOpacity(0.2),
+        indicatorColor: AppTheme.accentBlue.withValues(alpha: 0.2),
         selectedIndex: _currentIndex,
         onDestinationSelected: (index) {
-          if (_currentIndex == 2 && index == 0) {
+          if (index == 0) {
             _historyScreenKey.currentState?.reloadRecords();
           }
-          // 如果从设置页面切换到地图页面，重新加载地图类型
+          if (index == 1) {
-          if (_currentIndex == 2 && index == 1) {
+            _realtimeScreenKey.currentState?.loadRecords(scrollToTop: false);
+          }
+          if (_currentIndex == 3 && index == 2) {
             _loadMapType();
           }
           setState(() {
@@ -429,6 +451,7 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
         destinations: const [
           NavigationDestination(
               icon: Icon(Icons.directions_railway), label: '列车记录'),
+          NavigationDestination(icon: Icon(Icons.speed), label: '数据监控'),
           NavigationDestination(icon: Icon(Icons.location_on), label: '位置地图'),
           NavigationDestination(icon: Icon(Icons.settings), label: '设置'),
         ],

lib/services/database_service.dart

@@ -232,16 +232,28 @@ class DatabaseService {
 
   Future<int> deleteRecord(String uniqueId) async {
     final db = await database;
-    return await db.delete(
+    final result = await db.delete(
       trainRecordsTable,
       where: 'uniqueId = ?',
       whereArgs: [uniqueId],
     );
+
+    if (result > 0) {
+      _notifyRecordDeleted([uniqueId]);
+    }
+
+    return result;
   }
 
   Future<int> deleteAllRecords() async {
     final db = await database;
-    return await db.delete(trainRecordsTable);
+    final result = await db.delete(trainRecordsTable);
+
+    if (result > 0) {
+      _notifyRecordDeleted([]);
+    }
+
+    return result;
   }
 
   Future<int> getRecordCount() async {
@@ -279,20 +291,31 @@ class DatabaseService {
 
   Future<int> updateSettings(Map<String, dynamic> settings) async {
     final db = await database;
-    return await db.update(
+    final result = await db.update(
       appSettingsTable,
       settings,
       where: 'id = 1',
     );
+    if (result > 0) {
+      _notifySettingsChanged(settings);
+    }
+    return result;
   }
 
   Future<int> setSetting(String key, dynamic value) async {
     final db = await database;
-    return await db.update(
+    final result = await db.update(
       appSettingsTable,
       {key: value},
       where: 'id = 1',
     );
+    if (result > 0) {
+      final currentSettings = await getAllSettings();
+      if (currentSettings != null) {
+        _notifySettingsChanged(currentSettings);
+      }
+    }
+    return result;
   }
 
   Future<List<String>> getSearchOrderList() async {
@@ -349,6 +372,42 @@ class DatabaseService {
         whereArgs: [id],
       );
     }
+    _notifyRecordDeleted(uniqueIds);
+  }
+
+  final List<Function(List<String>)> _recordDeleteListeners = [];
+
+  final List<Function(Map<String, dynamic>)> _settingsListeners = [];
+
+  StreamSubscription<void> onRecordDeleted(Function(List<String>) listener) {
+    _recordDeleteListeners.add(listener);
+    return Stream.value(null).listen((_) {})
+      ..onData((_) {})
+      ..onDone(() {
+        _recordDeleteListeners.remove(listener);
+      });
+  }
+
+  void _notifyRecordDeleted(List<String> deletedIds) {
+    for (final listener in _recordDeleteListeners) {
+      listener(deletedIds);
+    }
+  }
+
+  StreamSubscription<void> onSettingsChanged(
+      Function(Map<String, dynamic>) listener) {
+    _settingsListeners.add(listener);
+    return Stream.value(null).listen((_) {})
+      ..onData((_) {})
+      ..onDone(() {
+        _settingsListeners.remove(listener);
+      });
+  }
+
+  void _notifySettingsChanged(Map<String, dynamic> settings) {
+    for (final listener in _settingsListeners) {
+      listener(settings);
+    }
   }
 
   Future<void> close() async {
@@ -404,6 +463,11 @@ class DatabaseService {
         }
       });
 
+      final currentSettings = await getAllSettings();
+      if (currentSettings != null) {
+        _notifySettingsChanged(currentSettings);
+      }
+
       return true;
     } catch (e) {
       return false;

pubspec.yaml

@@ -2,7 +2,7 @@ name: lbjconsole
 description: "LBJ Console"
 # The following line prevents the package from being accidentally published to
 # pub.dev using `flutter pub publish`. This is preferred for private packages.
-publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+publish_to: "none" # Remove this line if you wish to publish to pub.dev
 
 # The following defines the version and build number for your application.
 # A version number is three numbers separated by dots, like 1.2.43
@@ -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: 0.5.1-flutter+51
+version: 0.6.1-flutter+61
 
 environment:
   sdk: ^3.5.4
@@ -76,7 +76,6 @@ dev_dependencies:
 
 # The following section is specific to Flutter packages.
 flutter:
-
   # The following line ensures that the Material Icons font is
   # included with your application, so that you can use the icons in
   # the material Icons class.