feat: optimize Bluetooth connection status display

android/app/src/main/AndroidManifest.xml

@@ -19,7 +19,7 @@
     
     <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

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/screens/history_screen.dart

@@ -33,6 +33,7 @@ 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 = {};
@@ -123,6 +124,9 @@ class HistoryScreenState extends State<HistoryScreen> {
       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);
 
@@ -131,14 +135,31 @@ class HistoryScreenState extends State<HistoryScreen> {
           _displayItems.addAll(items);
         });
 
-        if (_isAtTop && _scrollController.hasClients) {
+        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) {
-      print('添加新纪录失败: $e');
         }
       }
+    } catch (e) {}
+  }
+
+  double _getEstimatedItemHeight() {
+    if (_itemHeightCache > 0) {
+      return _itemHeightCache;
+    }
+    return 85.0;
+  }
 
   bool _hasDataChanged(List<Object> newItems) {
     if (_displayItems.length != newItems.length) return true;
@@ -489,7 +510,11 @@ class HistoryScreenState extends State<HistoryScreen> {
     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),
@@ -545,6 +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}) {

lib/screens/main_screen.dart

@@ -13,6 +13,158 @@ 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});
 
@@ -28,7 +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>();
@@ -41,21 +194,35 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     _bleService.initialize();
     _initializeServices();
     _checkAndStartBackgroundService();
+    _setupLastReceivedTimeListener();
   }
 
   Future<void> _checkAndStartBackgroundService() async {
     final settings = await DatabaseService.instance.getAllSettings() ?? {};
-    final backgroundServiceEnabled = (settings['backgroundServiceEnabled'] ?? 0) == 1;
+    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();
   }
@@ -70,10 +237,6 @@ 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) {
@@ -133,17 +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,
@@ -274,6 +430,8 @@ class _PixelPerfectBluetoothDialogState
   List<BluetoothDevice> _devices = [];
   _ScanState _scanState = _ScanState.initial;
   StreamSubscription? _connectionSubscription;
+  StreamSubscription? _lastReceivedTimeSubscription;
+  DateTime? _lastReceivedTime;
   @override
   void initState() {
     super.initState();
@@ -288,6 +446,7 @@ class _PixelPerfectBluetoothDialogState
   @override
   void dispose() {
     _connectionSubscription?.cancel();
+    _lastReceivedTimeSubscription?.cancel();
     super.dispose();
   }
 
@@ -317,6 +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;
@@ -353,6 +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/settings_screen.dart

@@ -395,9 +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),

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/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.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: 0.1.7-flutter
+version: 0.2.0-flutter+20  # versionName: 0.2.0-flutter, versionCode: 3
 
 environment:
   sdk: ^3.5.4