feat: add record merging functionality and optimize settings page

app/build.gradle.kts

@@ -12,8 +12,8 @@ android {
         applicationId = "org.noxylva.lbjconsole"
         minSdk = 29
         targetSdk = 35
-        versionCode = 4
+        versionCode = 5
-        versionName = "0.0.4"
+        versionName = "0.0.5"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }

app/src/main/java/org/noxylva/lbjconsole/MainActivity.kt

@@ -42,9 +42,12 @@ import org.json.JSONObject
 import org.osmdroid.config.Configuration
 import org.noxylva.lbjconsole.model.TrainRecord
 import org.noxylva.lbjconsole.model.TrainRecordManager
+import org.noxylva.lbjconsole.model.MergeSettings
 import org.noxylva.lbjconsole.ui.screens.HistoryScreen
+import org.noxylva.lbjconsole.ui.screens.MergedHistoryScreen
 import org.noxylva.lbjconsole.ui.screens.MapScreen
 import org.noxylva.lbjconsole.ui.screens.SettingsScreen
+
 import org.noxylva.lbjconsole.ui.theme.LBJReceiverTheme
 import org.noxylva.lbjconsole.util.LocoInfoUtil
 import java.util.*
@@ -89,6 +92,11 @@ class MainActivity : ComponentActivity() {
     private var mapZoomLevel by mutableStateOf(10.0)
     private var mapRailwayLayerVisible by mutableStateOf(true)
     
+    private var settingsScrollPosition by mutableStateOf(0)
+    
+    private var mergeSettings by mutableStateOf(MergeSettings())
+    
+
     
     private var targetDeviceName = "LBJReceiver"
     
@@ -256,12 +264,18 @@ class MainActivity : ComponentActivity() {
                         },
                         
                         
-                        allRecords = if (trainRecordManager.getFilteredRecords().isNotEmpty())
+                        allRecords = trainRecordManager.getMixedRecords(),
-                            trainRecordManager.getFilteredRecords() else trainRecordManager.getAllRecords(),
+                        mergedRecords = trainRecordManager.getMergedRecords(),
                         recordCount = trainRecordManager.getRecordCount(),
                         filterTrain = filterTrain,
                         filterRoute = filterRoute,
                         filterDirection = filterDirection,
+                        mergeSettings = mergeSettings,
+                        onMergeSettingsChange = { newSettings ->
+                            mergeSettings = newSettings
+                            trainRecordManager.updateMergeSettings(newSettings)
+                            saveSettings()
+                        },
                         
                         
                         historyEditMode = historyEditMode,
@@ -279,6 +293,13 @@ class MainActivity : ComponentActivity() {
                         },
                         
                         
+                        settingsScrollPosition = settingsScrollPosition,
+                        onSettingsScrollPositionChange = { position ->
+                            settingsScrollPosition = position
+                            saveSettings()
+                        },
+                        
+                        
                         mapCenterPosition = mapCenterPosition,
                         mapZoomLevel = mapZoomLevel,
                         mapRailwayLayerVisible = mapRailwayLayerVisible,
@@ -332,7 +353,6 @@ class MainActivity : ComponentActivity() {
                         onApplySettings = {
                             saveSettings()
                             targetDeviceName = settingsDeviceName
-                            Toast.makeText(this, "设备名称 '${settingsDeviceName}' 已保存，下次连接时生效", Toast.LENGTH_LONG).show()
                             Log.d(TAG, "Applied settings deviceName=${settingsDeviceName}")
                         },
                         appVersion = getAppVersion(),
@@ -360,6 +380,8 @@ class MainActivity : ComponentActivity() {
                             }
                         )
                     }
+                    
+
                 }
             }
         }
@@ -585,6 +607,7 @@ class MainActivity : ComponentActivity() {
         
         historyScrollPosition = settingsPrefs.getInt("history_scroll_position", 0)
         historyScrollOffset = settingsPrefs.getInt("history_scroll_offset", 0)
+        settingsScrollPosition = settingsPrefs.getInt("settings_scroll_position", 0)
         
         val centerLat = settingsPrefs.getFloat("map_center_lat", Float.NaN)
         val centerLon = settingsPrefs.getFloat("map_center_lon", Float.NaN)
@@ -595,6 +618,8 @@ class MainActivity : ComponentActivity() {
         mapZoomLevel = settingsPrefs.getFloat("map_zoom_level", 10.0f).toDouble()
         mapRailwayLayerVisible = settingsPrefs.getBoolean("map_railway_visible", true)
         
+        mergeSettings = trainRecordManager.mergeSettings
+        
         Log.d(TAG, "Loaded settings deviceName=${settingsDeviceName} tab=${currentTab}")
     }
     
@@ -608,6 +633,7 @@ class MainActivity : ComponentActivity() {
             .putString("history_expanded_states", historyExpandedStates.map { "${it.key}:${it.value}" }.joinToString(";"))
             .putInt("history_scroll_position", historyScrollPosition)
             .putInt("history_scroll_offset", historyScrollOffset)
+            .putInt("settings_scroll_position", settingsScrollPosition)
             .putFloat("map_zoom_level", mapZoomLevel.toFloat())
             .putBoolean("map_railway_visible", mapRailwayLayerVisible)
             
@@ -656,11 +682,14 @@ fun MainContent(
     onClearMonitorLog: () -> Unit,
     
     
-    allRecords: List<TrainRecord>,
+    allRecords: List<Any>,
+    mergedRecords: List<org.noxylva.lbjconsole.model.MergedTrainRecord>,
     recordCount: Int,
     filterTrain: String,
     filterRoute: String,
     filterDirection: String,
+    mergeSettings: MergeSettings,
+    onMergeSettingsChange: (MergeSettings) -> Unit,
     onFilterChange: (String, String, String) -> Unit,
     onClearFilter: () -> Unit,
     onClearRecords: () -> Unit,
@@ -685,6 +714,10 @@ fun MainContent(
     onHistoryStateChange: (Boolean, Set<String>, Map<String, Boolean>, Int, Int) -> Unit,
     
     
+    settingsScrollPosition: Int,
+    onSettingsScrollPositionChange: (Int) -> Unit,
+    
+    
     mapCenterPosition: Pair<Double, Double>?,
     mapZoomLevel: Double,
     mapRailwayLayerVisible: Boolean,
@@ -770,8 +803,22 @@ fun MainContent(
                             IconButton(
                                 onClick = {
                                     if (historySelectedRecords.isNotEmpty()) {
-                                        val recordsToDelete = allRecords.filter {
+                                        val recordsToDelete = mutableListOf<TrainRecord>()
-                                            historySelectedRecords.contains(it.timestamp.time.toString())
+                                        allRecords.forEach { item ->
+                                            when (item) {
+                                                is TrainRecord -> {
+                                                    if (historySelectedRecords.contains(item.timestamp.time.toString())) {
+                                                        recordsToDelete.add(item)
+                                                    }
+                                                }
+                                                is org.noxylva.lbjconsole.model.MergedTrainRecord -> {
+                                                    item.records.forEach { record ->
+                                                        if (historySelectedRecords.contains(record.timestamp.time.toString())) {
+                                                            recordsToDelete.add(record)
+                                                        }
+                                                    }
+                                                }
+                                            }
                                         }
                                         onDeleteRecords(recordsToDelete)
                                         onHistoryStateChange(false, emptySet(), historyExpandedStates, historyScrollPosition, historyScrollOffset)
@@ -823,12 +870,14 @@ fun MainContent(
                 .padding(paddingValues)
         ) {
             when (currentTab) {
-                0 -> HistoryScreen(
+                0 -> {
+                    HistoryScreen(
                         records = allRecords,
                         latestRecord = latestRecord,
                         lastUpdateTime = lastUpdateTime,
                         temporaryStatusMessage = temporaryStatusMessage,
                         locoInfoUtil = locoInfoUtil,
+                        mergeSettings = mergeSettings,
                         onClearRecords = onClearRecords,
                         onRecordClick = onRecordClick,
                         onClearLog = onClearMonitorLog,
@@ -840,14 +889,23 @@ fun MainContent(
                         scrollOffset = historyScrollOffset,
                         onStateChange = onHistoryStateChange
                     )
+                }
                 2 -> SettingsScreen(
                     deviceName = deviceName,
                     onDeviceNameChange = onDeviceNameChange,
                     onApplySettings = onApplySettings,
-                    appVersion = appVersion
+                    appVersion = appVersion,
+                    mergeSettings = mergeSettings,
+                    onMergeSettingsChange = onMergeSettingsChange,
+                    scrollPosition = settingsScrollPosition,
+                    onScrollPositionChange = onSettingsScrollPositionChange
                 )
                 3 -> MapScreen(
-                    records = if (allRecords.isNotEmpty()) allRecords else recentRecords,
+                    records = if (allRecords.isNotEmpty()) {
+                        allRecords.filterIsInstance<TrainRecord>()
+                    } else {
+                        recentRecords
+                    },
                     centerPosition = mapCenterPosition,
                     zoomLevel = mapZoomLevel,
                     railwayLayerVisible = mapRailwayLayerVisible,

app/src/main/java/org/noxylva/lbjconsole/model/MergeSettings.kt

@@ -0,0 +1,43 @@
+package org.noxylva.lbjconsole.model
+
+data class MergeSettings(
+    val enabled: Boolean = true,
+    val groupBy: GroupBy = GroupBy.TRAIN_AND_LOCO,
+    val timeWindow: TimeWindow = TimeWindow.UNLIMITED
+)
+
+enum class GroupBy(val displayName: String) {
+    TRAIN_AND_LOCO("车次号+机车号"),
+    TRAIN_ONLY("仅车次号"),
+    LOCO_ONLY("仅机车号")
+}
+
+enum class TimeWindow(val displayName: String, val seconds: Long?) {
+    ONE_HOUR("1小时", 3600),
+    TWO_HOURS("2小时", 7200),
+    SIX_HOURS("6小时", 21600),
+    TWELVE_HOURS("12小时", 43200),
+    ONE_DAY("24小时", 86400),
+    UNLIMITED("不限时间", null)
+}
+
+fun generateGroupKey(record: TrainRecord, groupBy: GroupBy): String? {
+    return when (groupBy) {
+        GroupBy.TRAIN_AND_LOCO -> {
+            val train = record.train.trim()
+            val loco = record.loco.trim()
+            if (train.isNotEmpty() && train != "<NUL>" && 
+                loco.isNotEmpty() && loco != "<NUL>") {
+                "${train}_${loco}"
+            } else null
+        }
+        GroupBy.TRAIN_ONLY -> {
+            val train = record.train.trim()
+            if (train.isNotEmpty() && train != "<NUL>") train else null
+        }
+        GroupBy.LOCO_ONLY -> {
+            val loco = record.loco.trim()
+            if (loco.isNotEmpty() && loco != "<NUL>") loco else null
+        }
+    }
+}

app/src/main/java/org/noxylva/lbjconsole/model/MergedTrainRecord.kt

@@ -0,0 +1,20 @@
+package org.noxylva.lbjconsole.model
+
+import java.util.*
+
+data class MergedTrainRecord(
+    val groupKey: String,
+    val records: List<TrainRecord>,
+    val latestRecord: TrainRecord
+) {
+    val recordCount: Int get() = records.size
+    val timeSpan: Pair<Date, Date> get() = 
+        records.minByOrNull { it.timestamp }!!.timestamp to 
+        records.maxByOrNull { it.timestamp }!!.timestamp
+    
+    fun getAllCoordinates() = records.mapNotNull { it.getCoordinates() }
+    
+    fun getUniqueRoutes() = records.map { it.route }.filter { it.isNotEmpty() && it != "<NUL>" }.toSet()
+    
+    fun getUniquePositions() = records.map { it.position }.filter { it.isNotEmpty() && it != "<NUL>" }.toSet()
+}

app/src/main/java/org/noxylva/lbjconsole/model/TrainRecordManager.kt

@@ -19,6 +19,7 @@ class TrainRecordManager(private val context: Context) {
         const val MAX_RECORDS = 1000
         private const val PREFS_NAME = "train_records"
         private const val KEY_RECORDS = "records"
+        private const val KEY_MERGE_SETTINGS = "merge_settings"
     }
 
     
@@ -26,8 +27,12 @@ class TrainRecordManager(private val context: Context) {
     private val recordCount = AtomicInteger(0)
     private val prefs: SharedPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
     
+    var mergeSettings = MergeSettings()
+        private set
+    
     init {
         loadRecords()
+        loadMergeSettings()
     }
     
     
@@ -177,4 +182,110 @@ class TrainRecordManager(private val context: Context) {
     fun getRecordCount(): Int {
         return recordCount.get()
     }
+    
+    fun updateMergeSettings(newSettings: MergeSettings) {
+        mergeSettings = newSettings
+        saveMergeSettings()
+    }
+    
+    
+    fun getMergedRecords(): List<MergedTrainRecord> {
+        if (!mergeSettings.enabled) {
+            return emptyList()
+        }
+        
+        val records = getFilteredRecords()
+        return processRecordsForMerging(records, mergeSettings)
+    }
+    
+    fun getMixedRecords(): List<Any> {
+        if (!mergeSettings.enabled) {
+            return getFilteredRecords()
+        }
+        
+        val allRecords = getFilteredRecords()
+        val mergedRecords = processRecordsForMerging(allRecords, mergeSettings)
+        
+        val mergedRecordIds = mergedRecords.flatMap { merged ->
+            merged.records.map { it.timestamp.time.toString() }
+        }.toSet()
+        
+        val singleRecords = allRecords.filter { record ->
+            !mergedRecordIds.contains(record.timestamp.time.toString())
+        }
+        
+        val mixedList = mutableListOf<Any>()
+        mixedList.addAll(mergedRecords)
+        mixedList.addAll(singleRecords)
+        
+        return mixedList.sortedByDescending { item ->
+            when (item) {
+                is MergedTrainRecord -> item.latestRecord.timestamp
+                is TrainRecord -> item.timestamp
+                else -> Date(0)
+            }
+        }
+    }
+    
+    private fun processRecordsForMerging(records: List<TrainRecord>, settings: MergeSettings): List<MergedTrainRecord> {
+        val groupedRecords = mutableMapOf<String, MutableList<TrainRecord>>()
+        val currentTime = Date()
+        
+        records.forEach { record ->
+            val groupKey = generateGroupKey(record, settings.groupBy)
+            if (groupKey != null) {
+                val withinTimeWindow = settings.timeWindow.seconds?.let { windowSeconds ->
+                    (currentTime.time - record.timestamp.time) / 1000 <= windowSeconds
+                } ?: true
+                
+                if (withinTimeWindow) {
+                    groupedRecords.getOrPut(groupKey) { mutableListOf() }.add(record)
+                }
+            }
+        }
+        
+        return groupedRecords.mapNotNull { (groupKey, groupRecords) ->
+            if (groupRecords.size >= 2) {
+                val sortedRecords = groupRecords.sortedBy { it.timestamp }
+                val latestRecord = sortedRecords.maxByOrNull { it.timestamp }!!
+                MergedTrainRecord(
+                    groupKey = groupKey,
+                    records = sortedRecords,
+                    latestRecord = latestRecord
+                )
+            } else null
+        }.sortedByDescending { it.latestRecord.timestamp }
+    }
+    
+    private fun saveMergeSettings() {
+        try {
+            val json = JSONObject().apply {
+                put("enabled", mergeSettings.enabled)
+                put("groupBy", mergeSettings.groupBy.name)
+                put("timeWindow", mergeSettings.timeWindow.name)
+            }
+            prefs.edit().putString(KEY_MERGE_SETTINGS, json.toString()).apply()
+            Log.d(TAG, "Saved merge settings")
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to save merge settings: ${e.message}")
+        }
+    }
+    
+    private fun loadMergeSettings() {
+        try {
+            val jsonStr = prefs.getString(KEY_MERGE_SETTINGS, null)
+            if (jsonStr != null) {
+                val json = JSONObject(jsonStr)
+                mergeSettings = MergeSettings(
+                    enabled = json.getBoolean("enabled"),
+                    groupBy = GroupBy.valueOf(json.getString("groupBy")),
+                    timeWindow = TimeWindow.valueOf(json.getString("timeWindow"))
+                )
+            }
+            Log.d(TAG, "Loaded merge settings: $mergeSettings")
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to load merge settings: ${e.message}")
+            mergeSettings = MergeSettings()
+        }
+    }
 }

app/src/main/java/org/noxylva/lbjconsole/ui/screens/HistoryScreen.kt

@@ -33,139 +33,26 @@ import org.osmdroid.views.overlay.mylocation.GpsMyLocationProvider
 import org.osmdroid.views.overlay.mylocation.MyLocationNewOverlay
 import org.osmdroid.views.overlay.TilesOverlay
 import org.noxylva.lbjconsole.model.TrainRecord
+import org.noxylva.lbjconsole.model.MergedTrainRecord
+import org.noxylva.lbjconsole.model.MergeSettings
+import org.noxylva.lbjconsole.model.GroupBy
 import org.noxylva.lbjconsole.util.LocoInfoUtil
 import java.text.SimpleDateFormat
 import java.util.*
 
-@OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
+@OptIn(ExperimentalFoundationApi::class)
 @Composable
-fun HistoryScreen(
+fun TrainRecordItem(
-    records: List<TrainRecord>,
+    record: TrainRecord,
+    isSelected: Boolean,
+    isInEditMode: Boolean,
+    expandedStatesMap: MutableMap<String, Boolean>,
     latestRecord: TrainRecord?,
-    lastUpdateTime: Date?,
+    locoInfoUtil: LocoInfoUtil?,
-    temporaryStatusMessage: String? = null,
+    onRecordClick: (TrainRecord) -> Unit,
-    locoInfoUtil: LocoInfoUtil? = null,
+    onToggleSelection: (TrainRecord) -> Unit,
-    onClearRecords: () -> Unit = {},
+    onLongClick: (TrainRecord) -> Unit
-    onRecordClick: (TrainRecord) -> Unit = {},
-    onClearLog: () -> Unit = {},
-    onDeleteRecords: (List<TrainRecord>) -> Unit = {},
-    editMode: Boolean = false,
-    selectedRecords: Set<String> = emptySet(),
-    expandedStates: Map<String, Boolean> = emptyMap(),
-    scrollPosition: Int = 0,
-    scrollOffset: Int = 0,
-    onStateChange: (Boolean, Set<String>, Map<String, Boolean>, Int, Int) -> Unit = { _, _, _, _, _ -> }
 ) {
-
-    val refreshKey = latestRecord?.timestamp?.time ?: 0
-
-    var isInEditMode by remember(editMode) { mutableStateOf(editMode) }
-    val selectedRecordsList = remember(selectedRecords) { 
-        mutableStateListOf<TrainRecord>().apply {
-            addAll(records.filter { selectedRecords.contains(it.timestamp.time.toString()) })
-        }
-    }
-    val expandedStatesMap = remember(expandedStates) { 
-        mutableStateMapOf<String, Boolean>().apply { putAll(expandedStates) }
-    }
-    
-    val listState = rememberLazyListState(
-        initialFirstVisibleItemIndex = scrollPosition,
-        initialFirstVisibleItemScrollOffset = scrollOffset
-    )
-
-
-    val timeSinceLastUpdate = remember { mutableStateOf<String?>(null) }
-    LaunchedEffect(key1 = lastUpdateTime) {
-        if (lastUpdateTime != null) {
-            while (true) {
-                val now = Date()
-                val diffInSec = (now.time - lastUpdateTime.time) / 1000
-                timeSinceLastUpdate.value = when {
-                    diffInSec < 60 -> "${diffInSec}秒前"
-                    diffInSec < 3600 -> "${diffInSec / 60}分钟前"
-                    else -> "${diffInSec / 3600}小时前"
-                }
-                val updateInterval = if (diffInSec < 60) 500L else if (diffInSec < 3600) 30000L else 300000L
-                delay(updateInterval)
-            }
-        }
-    }
-    val filteredRecords = remember(records, refreshKey) {
-        records
-    }
-
-
-    LaunchedEffect(isInEditMode, selectedRecordsList.size) {
-        val selectedIds = selectedRecordsList.map { it.timestamp.time.toString() }.toSet()
-        onStateChange(isInEditMode, selectedIds, expandedStatesMap.toMap(), listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset)
-    }
-    
-    LaunchedEffect(expandedStatesMap.toMap()) {
-        if (!isInEditMode) {
-            val selectedIds = selectedRecordsList.map { it.timestamp.time.toString() }.toSet()
-            onStateChange(isInEditMode, selectedIds, expandedStatesMap.toMap(), listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset)
-        }
-    }
-    
-    LaunchedEffect(listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset) {
-        if (!isInEditMode) {
-            val selectedIds = selectedRecordsList.map { it.timestamp.time.toString() }.toSet()
-            onStateChange(isInEditMode, selectedIds, expandedStatesMap.toMap(), listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset)
-        }
-    }
-
-    LaunchedEffect(selectedRecordsList.size) {
-        if (selectedRecordsList.isEmpty() && isInEditMode) {
-            isInEditMode = false
-            onStateChange(false, emptySet(), expandedStatesMap.toMap(), listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset)
-        }
-    }
-
-    Box(modifier = Modifier.fillMaxSize()) {
-        Column(modifier = Modifier.fillMaxSize()) {
-
-            Box(
-                modifier = Modifier
-                    .fillMaxSize()
-                    .padding(16.dp)
-                    .weight(1.0f)
-            ) {
-                if (filteredRecords.isEmpty()) {
-                    Box(
-                        modifier = Modifier.fillMaxSize(),
-                        contentAlignment = Alignment.Center
-                    ) {
-                        Column(horizontalAlignment = Alignment.CenterHorizontally) {
-                            Text(
-                                "暂无列车信息",
-                                style = MaterialTheme.typography.titleLarge,
-                                color = MaterialTheme.colorScheme.outline
-                            )
-
-                            if (lastUpdateTime != null) {
-                                Spacer(modifier = Modifier.height(8.dp))
-                                Text(
-                                    "上次接收数据: ${
-                                        SimpleDateFormat(
-                                            "HH:mm:ss",
-                                            Locale.getDefault()
-                                        ).format(lastUpdateTime)
-                                    }",
-                                    style = MaterialTheme.typography.bodyMedium,
-                                    color = MaterialTheme.colorScheme.outline.copy(alpha = 0.7f)
-                                )
-                            }
-                        }
-                    }
-                } else {
-                    LazyColumn(
-                        state = listState,
-                        modifier = Modifier.fillMaxSize(),
-                        verticalArrangement = Arrangement.spacedBy(8.dp)
-                    ) {
-                        items(filteredRecords) { record ->
-                            val isSelected = selectedRecordsList.contains(record)
     val cardColor = when {
         isSelected -> MaterialTheme.colorScheme.primaryContainer
         else -> MaterialTheme.colorScheme.surface
@@ -185,27 +72,16 @@ fun HistoryScreen(
                 .combinedClickable(
                     onClick = {
                         if (isInEditMode) {
-                                                    if (isSelected) {
+                            onToggleSelection(record)
-                                                        selectedRecordsList.remove(record)
-                                                    } else {
-                                                        selectedRecordsList.add(record)
-                                                    }
                         } else {
                             val id = record.timestamp.time.toString()
-                                                    expandedStatesMap[id] =
+                            expandedStatesMap[id] = !(expandedStatesMap[id] ?: false)
-                                                        !(expandedStatesMap[id] ?: false)
                             if (record == latestRecord) {
                                 onRecordClick(record)
                             }
                         }
                     },
-                                            onLongClick = {
+                    onLongClick = { onLongClick(record) },
-                                                if (!isInEditMode) {
-                                                    isInEditMode = true
-                                                    selectedRecordsList.clear()
-                                                    selectedRecordsList.add(record)
-                                                }
-                                            },
                     interactionSource = remember { MutableInteractionSource() },
                     indication = rememberRipple(bounded = true)
                 )
@@ -250,8 +126,7 @@ fun HistoryScreen(
                     horizontalArrangement = Arrangement.SpaceBetween,
                     verticalAlignment = Alignment.CenterVertically
                 ) {
-                                            val trainDisplay =
+                    val trainDisplay = recordMap["train"]?.toString() ?: "未知列车"
-                                                recordMap["train"]?.toString() ?: "未知列车"
 
                     Row(
                         verticalAlignment = Alignment.CenterVertically,
@@ -302,7 +177,6 @@ fun HistoryScreen(
                             }
                             "${record.locoType}-${shortLoco}"
                         }
-
                         record.locoType.isNotEmpty() -> record.locoType
                         record.loco.isNotEmpty() -> record.loco
                         else -> ""
@@ -324,8 +198,7 @@ fun HistoryScreen(
                     horizontalArrangement = Arrangement.SpaceBetween
                 ) {
                     val routeStr = record.route.trim()
-                                            val isValidRoute =
+                    val isValidRoute = routeStr.isNotEmpty() && !routeStr.all { it == '*' }
-                                                routeStr.isNotEmpty() && !routeStr.all { it == '*' }
 
                     val position = record.position.trim()
                     val isValidPosition = position.isNotEmpty() &&
@@ -395,7 +268,6 @@ fun HistoryScreen(
                     }
 
                     if (coordinates != null) {
-
                         Box(
                             modifier = Modifier
                                 .fillMaxWidth()
@@ -414,15 +286,11 @@ fun HistoryScreen(
                                         setTileSource(TileSourceFactory.MAPNIK)
                                         setMultiTouchControls(true)
                                         zoomController.setVisibility(org.osmdroid.views.CustomZoomButtonsController.Visibility.NEVER)
-                                                                isHorizontalMapRepetitionEnabled =
+                                        isHorizontalMapRepetitionEnabled = false
-                                                                    false
+                                        isVerticalMapRepetitionEnabled = false
-                                                                isVerticalMapRepetitionEnabled =
-                                                                    false
                                         setHasTransientState(true)
                                         setOnTouchListener { v, event ->
-                                                                    v.parent?.requestDisallowInterceptTouchEvent(
+                                            v.parent?.requestDisallowInterceptTouchEvent(true)
-                                                                        true
-                                                                    )
                                             false
                                         }
                                         controller.setZoom(10.0)
@@ -431,12 +299,8 @@ fun HistoryScreen(
                                         this.setUseDataConnection(true)
 
                                         try {
-                                                                    val railwayTileSource =
+                                            val railwayTileSource = XYTileSource(
-                                                                        XYTileSource(
+                                                "OpenRailwayMap", 8, 16, 256, ".png",
-                                                                            "OpenRailwayMap",
-                                                                            8, 16,
-                                                                            256,
-                                                                            ".png",
                                                 arrayOf(
                                                     "https://a.tiles.openrailwaymap.org/standard/",
                                                     "https://b.tiles.openrailwaymap.org/standard/",
@@ -445,44 +309,26 @@ fun HistoryScreen(
                                                 "© OpenRailwayMap contributors, © OpenStreetMap contributors"
                                             )
 
-                                                                    val railwayProvider =
+                                            val railwayProvider = MapTileProviderBasic(context)
-                                                                        MapTileProviderBasic(context)
+                                            railwayProvider.tileSource = railwayTileSource
-                                                                    railwayProvider.tileSource =
-                                                                        railwayTileSource
 
-                                                                    val railwayOverlay =
+                                            val railwayOverlay = TilesOverlay(railwayProvider, context)
-                                                                        TilesOverlay(
+                                            railwayOverlay.loadingBackgroundColor = android.graphics.Color.TRANSPARENT
-                                                                            railwayProvider,
+                                            railwayOverlay.loadingLineColor = android.graphics.Color.TRANSPARENT
-                                                                            context
-                                                                        )
-                                                                    railwayOverlay.loadingBackgroundColor =
-                                                                        android.graphics.Color.TRANSPARENT
-                                                                    railwayOverlay.loadingLineColor =
-                                                                        android.graphics.Color.TRANSPARENT
 
                                             overlays.add(railwayOverlay)
                                         } catch (e: Exception) {
                                             e.printStackTrace()
                                         }
 
-
                                         try {
-                                                                    val locationProvider =
+                                            val locationProvider = GpsMyLocationProvider(context).apply {
-                                                                        GpsMyLocationProvider(
+                                                locationUpdateMinDistance = 10f
-                                                                            context
+                                                locationUpdateMinTime = 1000
-                                                                        ).apply {
-                                                                            locationUpdateMinDistance =
-                                                                                10f
-                                                                            locationUpdateMinTime =
-                                                                                1000
                                             }
 
-                                                                    MyLocationNewOverlay(
+                                            MyLocationNewOverlay(locationProvider, this).apply {
-                                                                        locationProvider,
-                                                                        this
-                                                                    ).apply {
                                                 enableMyLocation()
-
                                             }.also { overlays.add(it) }
                                         } catch (e: Exception) {
                                             e.printStackTrace()
@@ -491,34 +337,18 @@ fun HistoryScreen(
                                         val marker = Marker(this)
                                         marker.position = coordinates
 
-                                                                val latStr = String.format(
+                                        val latStr = String.format("%.4f", coordinates.latitude)
-                                                                    "%.4f",
+                                        val lonStr = String.format("%.4f", coordinates.longitude)
-                                                                    coordinates.latitude
+                                        val coordStr = "${latStr}°N, ${lonStr}°E"
-                                                                )
+                                        marker.title = recordMap["train"]?.toString() ?: "列车"
-                                                                val lonStr = String.format(
-                                                                    "%.4f",
-                                                                    coordinates.longitude
-                                                                )
-                                                                val coordStr =
-                                                                    "${latStr}°N, ${lonStr}°E"
-                                                                marker.title =
-                                                                    recordMap["train"]?.toString()
-                                                                        ?: "列车"
-
                                         marker.snippet = coordStr
-
+                                        marker.setInfoWindowAnchor(Marker.ANCHOR_CENTER, 0f)
-                                                                marker.setInfoWindowAnchor(
-                                                                    Marker.ANCHOR_CENTER,
-                                                                    0f
-                                                                )
 
                                         overlays.add(marker)
                                         marker.showInfoWindow()
                                     }
                                 },
-                                                        update = { mapView ->
+                                update = { mapView -> mapView.invalidate() }
-                                                            mapView.invalidate()
-                                                        }
                             )
                         }
                     }
@@ -534,6 +364,641 @@ fun HistoryScreen(
             }
         }
     }
+}
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+fun MergedTrainRecordItem(
+    mergedRecord: MergedTrainRecord,
+    expandedStatesMap: MutableMap<String, Boolean>,
+    locoInfoUtil: LocoInfoUtil?,
+    mergeSettings: MergeSettings? = null,
+    isInEditMode: Boolean = false,
+    selectedRecords: List<TrainRecord> = emptyList(),
+    onToggleSelection: (TrainRecord) -> Unit = {},
+    onLongClick: (TrainRecord) -> Unit = {}
+) {
+    val recordId = mergedRecord.groupKey
+    val isExpanded = expandedStatesMap[recordId] == true
+    val latestRecord = mergedRecord.latestRecord
+    
+    val hasSelectedRecords = mergedRecord.records.any { selectedRecords.contains(it) }
+    val cardColor = when {
+        hasSelectedRecords -> MaterialTheme.colorScheme.primaryContainer
+        else -> MaterialTheme.colorScheme.surface
+    }
+
+    Card(
+        modifier = Modifier.fillMaxWidth(),
+        elevation = CardDefaults.cardElevation(defaultElevation = 2.dp),
+        colors = CardDefaults.cardColors(
+            containerColor = cardColor
+        ),
+        shape = RoundedCornerShape(8.dp)
+    ) {
+        Box(
+            modifier = Modifier
+                .fillMaxWidth()
+                .combinedClickable(
+                    onClick = {
+                        if (isInEditMode) {
+                            if (hasSelectedRecords) {
+                                mergedRecord.records.forEach { record ->
+                                    if (selectedRecords.contains(record)) {
+                                        onToggleSelection(record)
+                                    }
+                                }
+                            } else {
+                                mergedRecord.records.forEach { record ->
+                                    if (!selectedRecords.contains(record)) {
+                                        onToggleSelection(record)
+                                    }
+                                }
+                            }
+                        } else {
+                            expandedStatesMap[recordId] = !isExpanded
+                        }
+                    },
+                    onLongClick = {
+                        if (!isInEditMode) {
+                            onLongClick(mergedRecord.records.first())
+                        }
+                    },
+                    interactionSource = remember { MutableInteractionSource() },
+                    indication = rememberRipple(bounded = true)
+                )
+        ) {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 16.dp, vertical = 8.dp)
+            ) {
+                val recordMap = latestRecord.toMap(showDetailedTime = true)
+                
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    if (recordMap.containsKey("time")) {
+                        Column {
+                            recordMap["time"]?.split("\n")?.forEach { timeLine ->
+                                Text(
+                                    text = timeLine,
+                                    fontSize = 10.sp,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                                )
+                            }
+                        }
+                    }
+                    
+                    Text(
+                        text = "${latestRecord.rssi} dBm",
+                        fontSize = 10.sp,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+
+                Spacer(modifier = Modifier.height(2.dp))
+
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    val trainDisplay = recordMap["train"]?.toString() ?: "未知列车"
+
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically,
+                        horizontalArrangement = Arrangement.spacedBy(6.dp)
+                    ) {
+                        Text(
+                            text = trainDisplay,
+                            fontWeight = FontWeight.Bold,
+                            fontSize = 20.sp,
+                            color = MaterialTheme.colorScheme.primary
+                        )
+
+                        val directionText = when (latestRecord.direction) {
+                            1 -> "下"
+                            3 -> "上"
+                            else -> ""
+                        }
+
+                        if (directionText.isNotEmpty()) {
+                            Surface(
+                                shape = RoundedCornerShape(2.dp),
+                                color = MaterialTheme.colorScheme.onSurface,
+                                modifier = Modifier.size(20.dp)
+                            ) {
+                                Box(
+                                    modifier = Modifier.fillMaxSize(),
+                                    contentAlignment = Alignment.Center
+                                ) {
+                                    Text(
+                                        text = directionText,
+                                        fontSize = 12.sp,
+                                        fontWeight = FontWeight.Bold,
+                                        color = MaterialTheme.colorScheme.surface,
+                                        maxLines = 1,
+                                        modifier = Modifier.offset(y = (-2).dp)
+                                    )
+                                }
+                            }
+                        }
+                    }
+
+                    val formattedInfo = when {
+                        latestRecord.locoType.isNotEmpty() && latestRecord.loco.isNotEmpty() -> {
+                            val shortLoco = if (latestRecord.loco.length > 5) {
+                                latestRecord.loco.takeLast(5)
+                            } else {
+                                latestRecord.loco
+                            }
+                            "${latestRecord.locoType}-${shortLoco}"
+                        }
+                        latestRecord.locoType.isNotEmpty() -> latestRecord.locoType
+                        latestRecord.loco.isNotEmpty() -> latestRecord.loco
+                        else -> ""
+                    }
+                    
+                    if (formattedInfo.isNotEmpty() && formattedInfo != "<NUL>") {
+                        Text(
+                            text = formattedInfo,
+                            fontSize = 14.sp,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                }
+
+                Spacer(modifier = Modifier.height(8.dp))
+
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween
+                ) {
+                    val routeStr = latestRecord.route.trim()
+                    val isValidRoute = routeStr.isNotEmpty() && !routeStr.all { it == '*' }
+
+                    val position = latestRecord.position.trim()
+                    val isValidPosition = position.isNotEmpty() &&
+                            !position.all { it == '-' || it == '.' } &&
+                            position != "<NUL>"
+
+                    if (isValidRoute || isValidPosition) {
+                        Row(
+                            verticalAlignment = Alignment.CenterVertically,
+                            modifier = Modifier.height(24.dp),
+                            horizontalArrangement = Arrangement.spacedBy(4.dp)
+                        ) {
+                            if (isValidRoute) {
+                                Text(
+                                    text = "$routeStr",
+                                    fontSize = 16.sp,
+                                    color = MaterialTheme.colorScheme.onSurface,
+                                    modifier = Modifier.alignByBaseline()
+                                )
+                            }
+
+                            if (isValidPosition) {
+                                Text(
+                                    text = "${position}K",
+                                    fontSize = 16.sp,
+                                    color = MaterialTheme.colorScheme.onSurface,
+                                    modifier = Modifier.alignByBaseline()
+                                )
+                            }
+                        }
+                    }
+
+                    val speed = latestRecord.speed.trim()
+                    val isValidSpeed = speed.isNotEmpty() &&
+                            !speed.all { it == '*' || it == '-' } &&
+                            speed != "NUL" &&
+                            speed != "<NUL>"
+                    if (isValidSpeed) {
+                        Text(
+                            text = "${speed} km/h",
+                            fontSize = 16.sp,
+                            color = MaterialTheme.colorScheme.onSurface
+                        )
+                    }
+                }
+
+                if (locoInfoUtil != null && latestRecord.locoType.isNotEmpty() && latestRecord.loco.isNotEmpty()) {
+                    val locoInfoText = locoInfoUtil.getLocoInfoDisplay(
+                        latestRecord.locoType,
+                        latestRecord.loco
+                    )
+                    if (locoInfoText != null) {
+                        Spacer(modifier = Modifier.height(4.dp))
+                        Text(
+                            text = locoInfoText,
+                            fontSize = 14.sp,
+                            color = MaterialTheme.colorScheme.onSurface
+                        )
+                    }
+                }
+
+                if (isExpanded) {
+                    val coordinates = remember { latestRecord.getCoordinates() }
+
+                    if (coordinates != null) {
+                        Spacer(modifier = Modifier.height(8.dp))
+                    }
+
+                    if (coordinates != null) {
+                        Box(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .height(220.dp)
+                                .padding(vertical = 4.dp)
+                                .clip(RoundedCornerShape(8.dp)),
+                            contentAlignment = Alignment.Center
+                        ) {
+                            AndroidView(
+                                modifier = Modifier.clickable(
+                                    indication = null,
+                                    interactionSource = remember { MutableInteractionSource() }
+                                ) {},
+                                factory = { context ->
+                                    MapView(context).apply {
+                                        setTileSource(TileSourceFactory.MAPNIK)
+                                        setMultiTouchControls(true)
+                                        zoomController.setVisibility(org.osmdroid.views.CustomZoomButtonsController.Visibility.NEVER)
+                                        isHorizontalMapRepetitionEnabled = false
+                                        isVerticalMapRepetitionEnabled = false
+                                        setHasTransientState(true)
+                                        setOnTouchListener { v, event ->
+                                            v.parent?.requestDisallowInterceptTouchEvent(true)
+                                            false
+                                        }
+                                        controller.setZoom(10.0)
+                                        controller.setCenter(coordinates)
+                                        this.isTilesScaledToDpi = true
+                                        this.setUseDataConnection(true)
+
+                                        try {
+                                            val railwayTileSource = XYTileSource(
+                                                "OpenRailwayMap", 8, 16, 256, ".png",
+                                                arrayOf(
+                                                    "https://a.tiles.openrailwayMap.org/standard/",
+                                                    "https://b.tiles.openrailwaymap.org/standard/",
+                                                    "https://c.tiles.openrailwaymap.org/standard/"
+                                                ),
+                                                "© OpenRailwayMap contributors, © OpenStreetMap contributors"
+                                            )
+
+                                            val railwayProvider = MapTileProviderBasic(context)
+                                            railwayProvider.tileSource = railwayTileSource
+
+                                            val railwayOverlay = TilesOverlay(railwayProvider, context)
+                                            railwayOverlay.loadingBackgroundColor = android.graphics.Color.TRANSPARENT
+                                            railwayOverlay.loadingLineColor = android.graphics.Color.TRANSPARENT
+
+                                            overlays.add(railwayOverlay)
+                                        } catch (e: Exception) {
+                                            e.printStackTrace()
+                                        }
+
+                                        try {
+                                            val locationProvider = GpsMyLocationProvider(context).apply {
+                                                locationUpdateMinDistance = 10f
+                                                locationUpdateMinTime = 1000
+                                            }
+
+                                            MyLocationNewOverlay(locationProvider, this).apply {
+                                                enableMyLocation()
+                                            }.also { overlays.add(it) }
+                                        } catch (e: Exception) {
+                                            e.printStackTrace()
+                                        }
+
+                                        val marker = Marker(this)
+                                        marker.position = coordinates
+
+                                        val latStr = String.format("%.4f", coordinates.latitude)
+                                        val lonStr = String.format("%.4f", coordinates.longitude)
+                                        val coordStr = "${latStr}°N, ${lonStr}°E"
+                                        marker.title = recordMap["train"]?.toString() ?: "列车"
+                                        marker.snippet = coordStr
+                                        marker.setInfoWindowAnchor(Marker.ANCHOR_CENTER, 0f)
+
+                                        overlays.add(marker)
+                                        marker.showInfoWindow()
+                                    }
+                                },
+                                update = { mapView -> mapView.invalidate() }
+                            )
+                        }
+                    }
+                    if (recordMap.containsKey("position_info")) {
+                        Spacer(modifier = Modifier.height(8.dp))
+                        Text(
+                            text = recordMap["position_info"] ?: "",
+                            fontSize = 14.sp,
+                            color = MaterialTheme.colorScheme.onSurface
+                        )
+                    }
+                    
+                    Spacer(modifier = Modifier.height(8.dp))
+                    HorizontalDivider()
+                    Spacer(modifier = Modifier.height(8.dp))
+                    
+                    mergedRecord.records.forEach { recordItem ->
+                        val timeFormat = SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault())
+                        
+                        Column(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .padding(vertical = 4.dp)
+                        ) {
+                            Row(
+                                modifier = Modifier.fillMaxWidth(),
+                                horizontalArrangement = Arrangement.SpaceBetween,
+                                verticalAlignment = Alignment.CenterVertically
+                            ) {
+                                Text(
+                                    text = timeFormat.format(recordItem.timestamp),
+                                    fontSize = 12.sp,
+                                    fontWeight = FontWeight.Medium,
+                                    color = MaterialTheme.colorScheme.onSurface
+                                )
+                                
+                                val extraInfo = when (mergeSettings?.groupBy) {
+                                    GroupBy.LOCO_ONLY -> {
+                                        if (recordItem.train.isNotEmpty() && recordItem.train != "<NUL>") {
+                                            recordItem.train
+                                        } else null
+                                    }
+                                    GroupBy.TRAIN_ONLY -> {
+                                        if (recordItem.loco.isNotEmpty() && recordItem.loco != "<NUL>") {
+                                            "${recordItem.locoType}-${recordItem.loco}"
+                                        } else null
+                                    }
+                                    else -> null
+                                }
+                                
+                                if (extraInfo != null) {
+                                    Text(
+                                        text = extraInfo,
+                                        fontSize = 11.sp,
+                                        fontWeight = FontWeight.Medium,
+                                        color = MaterialTheme.colorScheme.primary
+                                    )
+                                }
+                            }
+                            
+                            Row(
+                                modifier = Modifier.fillMaxWidth(),
+                                horizontalArrangement = Arrangement.SpaceBetween
+                            ) {
+                                val locationText = buildString {
+                                    if (recordItem.route.isNotEmpty() && recordItem.route != "<NUL>") {
+                                        append(recordItem.route)
+                                    }
+                                    if (recordItem.position.isNotEmpty() && recordItem.position != "<NUL>") {
+                                        if (isNotEmpty()) append(" ")
+                                        append("${recordItem.position}K")
+                                    }
+                                }
+                                
+                                Text(
+                                    text = locationText.ifEmpty { "位置未知" },
+                                    fontSize = 11.sp,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                                )
+                                
+                                Row(
+                                    horizontalArrangement = Arrangement.spacedBy(8.dp)
+                                ) {
+                                    val directionText = when (recordItem.direction) {
+                                        1 -> "下行"
+                                        3 -> "上行"
+                                        else -> "未知"
+                                    }
+                                    Text(
+                                        text = directionText,
+                                        fontSize = 11.sp,
+                                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                                    )
+                                    
+                                    val speedText = if (recordItem.speed.isNotEmpty() &&
+                                                       recordItem.speed != "<NUL>" &&
+                                                       !recordItem.speed.all { it == '*' || it == '-' }) {
+                                        "${recordItem.speed}km/h"
+                                    } else {
+                                        "速度未知"
+                                    }
+                                    Text(
+                                        text = speedText,
+                                        fontSize = 11.sp,
+                                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
+@Composable
+fun HistoryScreen(
+    records: List<Any>,
+    latestRecord: TrainRecord?,
+    lastUpdateTime: Date?,
+    temporaryStatusMessage: String? = null,
+    locoInfoUtil: LocoInfoUtil? = null,
+    mergeSettings: MergeSettings? = null,
+    onClearRecords: () -> Unit = {},
+    onRecordClick: (TrainRecord) -> Unit = {},
+    onClearLog: () -> Unit = {},
+    onDeleteRecords: (List<TrainRecord>) -> Unit = {},
+    editMode: Boolean = false,
+    selectedRecords: Set<String> = emptySet(),
+    expandedStates: Map<String, Boolean> = emptyMap(),
+    scrollPosition: Int = 0,
+    scrollOffset: Int = 0,
+    onStateChange: (Boolean, Set<String>, Map<String, Boolean>, Int, Int) -> Unit = { _, _, _, _, _ -> }
+) {
+
+    val refreshKey = latestRecord?.timestamp?.time ?: 0
+
+    var isInEditMode by remember(editMode) { mutableStateOf(editMode) }
+    val selectedRecordsList = remember(selectedRecords) { 
+        mutableStateListOf<TrainRecord>().apply {
+            records.forEach { item ->
+                when (item) {
+                    is TrainRecord -> {
+                        if (selectedRecords.contains(item.timestamp.time.toString())) {
+                            add(item)
+                        }
+                    }
+                    is MergedTrainRecord -> {
+                        item.records.forEach { record ->
+                            if (selectedRecords.contains(record.timestamp.time.toString())) {
+                                add(record)
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    val expandedStatesMap = remember(expandedStates) { 
+        mutableStateMapOf<String, Boolean>().apply { putAll(expandedStates) }
+    }
+    
+    val listState = rememberLazyListState(
+        initialFirstVisibleItemIndex = scrollPosition,
+        initialFirstVisibleItemScrollOffset = scrollOffset
+    )
+
+
+    val timeSinceLastUpdate = remember { mutableStateOf<String?>(null) }
+    LaunchedEffect(key1 = lastUpdateTime) {
+        if (lastUpdateTime != null) {
+            while (true) {
+                val now = Date()
+                val diffInSec = (now.time - lastUpdateTime.time) / 1000
+                timeSinceLastUpdate.value = when {
+                    diffInSec < 60 -> "${diffInSec}秒前"
+                    diffInSec < 3600 -> "${diffInSec / 60}分钟前"
+                    else -> "${diffInSec / 3600}小时前"
+                }
+                val updateInterval = if (diffInSec < 60) 500L else if (diffInSec < 3600) 30000L else 300000L
+                delay(updateInterval)
+            }
+        }
+    }
+    val filteredRecords = remember(records, refreshKey) {
+        records
+    }
+
+
+    LaunchedEffect(isInEditMode, selectedRecordsList.size) {
+        val selectedIds = selectedRecordsList.map { it.timestamp.time.toString() }.toSet()
+        onStateChange(isInEditMode, selectedIds, expandedStatesMap.toMap(), listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset)
+    }
+    
+    LaunchedEffect(expandedStatesMap.toMap()) {
+        if (!isInEditMode) {
+            val selectedIds = selectedRecordsList.map { it.timestamp.time.toString() }.toSet()
+            onStateChange(isInEditMode, selectedIds, expandedStatesMap.toMap(), listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset)
+        }
+    }
+    
+    LaunchedEffect(listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset) {
+        if (!isInEditMode) {
+            val selectedIds = selectedRecordsList.map { it.timestamp.time.toString() }.toSet()
+            onStateChange(isInEditMode, selectedIds, expandedStatesMap.toMap(), listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset)
+        }
+    }
+
+    LaunchedEffect(selectedRecordsList.size) {
+        if (selectedRecordsList.isEmpty() && isInEditMode) {
+            isInEditMode = false
+            onStateChange(false, emptySet(), expandedStatesMap.toMap(), listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset)
+        }
+    }
+
+    Box(modifier = Modifier.fillMaxSize()) {
+        Column(modifier = Modifier.fillMaxSize()) {
+            Box(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .padding(16.dp)
+                    .weight(1.0f)
+            ) {
+                if (filteredRecords.isEmpty()) {
+                    Box(
+                        modifier = Modifier.fillMaxSize(),
+                        contentAlignment = Alignment.Center
+                    ) {
+                        Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                            Text(
+                                "暂无列车信息",
+                                style = MaterialTheme.typography.titleLarge,
+                                color = MaterialTheme.colorScheme.outline
+                            )
+
+                            if (lastUpdateTime != null) {
+                                Spacer(modifier = Modifier.height(8.dp))
+                                Text(
+                                    "上次接收数据: ${
+                                        SimpleDateFormat(
+                                            "HH:mm:ss",
+                                            Locale.getDefault()
+                                        ).format(lastUpdateTime)
+                                    }",
+                                    style = MaterialTheme.typography.bodyMedium,
+                                    color = MaterialTheme.colorScheme.outline.copy(alpha = 0.7f)
+                                )
+                            }
+                        }
+                    }
+                } else {
+                    LazyColumn(
+                        state = listState,
+                        modifier = Modifier.fillMaxSize(),
+                        verticalArrangement = Arrangement.spacedBy(8.dp)
+                    ) {
+                        items(filteredRecords) { item ->
+                            when (item) {
+                                is TrainRecord -> {
+                                    TrainRecordItem(
+                                        record = item,
+                                        isSelected = selectedRecordsList.contains(item),
+                                        isInEditMode = isInEditMode,
+                                        expandedStatesMap = expandedStatesMap,
+                                        latestRecord = latestRecord,
+                                        locoInfoUtil = locoInfoUtil,
+                                        onRecordClick = onRecordClick,
+                                        onToggleSelection = { record ->
+                                            if (selectedRecordsList.contains(record)) {
+                                                selectedRecordsList.remove(record)
+                                            } else {
+                                                selectedRecordsList.add(record)
+                                            }
+                                        },
+                                        onLongClick = { record ->
+                                            if (!isInEditMode) {
+                                                isInEditMode = true
+                                                selectedRecordsList.clear()
+                                                selectedRecordsList.add(record)
+                                            }
+                                        }
+                                    )
+                                }
+                                is MergedTrainRecord -> {
+                                    MergedTrainRecordItem(
+                                        mergedRecord = item,
+                                        expandedStatesMap = expandedStatesMap,
+                                        locoInfoUtil = locoInfoUtil,
+                                        mergeSettings = mergeSettings,
+                                        isInEditMode = isInEditMode,
+                                        selectedRecords = selectedRecordsList,
+                                        onToggleSelection = { record ->
+                                            if (selectedRecordsList.contains(record)) {
+                                                selectedRecordsList.remove(record)
+                                            } else {
+                                                selectedRecordsList.add(record)
+                                            }
+                                        },
+                                        onLongClick = { record ->
+                                            if (!isInEditMode) {
+                                                isInEditMode = true
+                                                selectedRecordsList.clear()
+                                                selectedRecordsList.add(record)
+                                            }
+                                        }
+                                    )
+                                }
+                            }
                         }
                     }
                 }

app/src/main/java/org/noxylva/lbjconsole/ui/screens/MergedHistoryScreen.kt

@@ -0,0 +1,490 @@
+package org.noxylva.lbjconsole.ui.screens
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.background
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.*
+import androidx.compose.material.ripple.rememberRipple
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.compose.ui.viewinterop.AndroidView
+import org.osmdroid.tileprovider.MapTileProviderBasic
+import org.osmdroid.tileprovider.tilesource.TileSourceFactory
+import org.osmdroid.tileprovider.tilesource.XYTileSource
+import org.osmdroid.views.MapView
+import org.osmdroid.views.overlay.Marker
+import org.osmdroid.views.overlay.Polyline
+import org.osmdroid.views.overlay.TilesOverlay
+import org.noxylva.lbjconsole.model.MergedTrainRecord
+import org.noxylva.lbjconsole.model.TrainRecord
+import org.noxylva.lbjconsole.util.LocoInfoUtil
+import java.text.SimpleDateFormat
+import java.util.*
+
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
+@Composable
+fun MergedHistoryScreen(
+    mergedRecords: List<MergedTrainRecord>,
+    latestRecord: TrainRecord?,
+    lastUpdateTime: Date?,
+    temporaryStatusMessage: String? = null,
+    locoInfoUtil: LocoInfoUtil? = null,
+    onClearRecords: () -> Unit = {},
+    onRecordClick: (TrainRecord) -> Unit = {},
+    onClearLog: () -> Unit = {},
+    onDeleteRecords: (List<TrainRecord>) -> Unit = {},
+    onDeleteMergedRecord: (MergedTrainRecord) -> Unit = {},
+    editMode: Boolean = false,
+    selectedRecords: Set<String> = emptySet(),
+    expandedStates: Map<String, Boolean> = emptyMap(),
+    scrollPosition: Int = 0,
+    scrollOffset: Int = 0,
+    onStateChange: (Boolean, Set<String>, Map<String, Boolean>, Int, Int) -> Unit = { _, _, _, _, _ -> }
+) {
+    var isInEditMode by remember(editMode) { mutableStateOf(editMode) }
+    val selectedRecordsList = remember(selectedRecords) { 
+        mutableStateListOf<TrainRecord>().apply {
+            addAll(mergedRecords.flatMap { it.records }.filter { 
+                selectedRecords.contains(it.timestamp.time.toString()) 
+            })
+        }
+    }
+    val expandedStatesMap = remember(expandedStates) { 
+        mutableStateMapOf<String, Boolean>().apply { putAll(expandedStates) }
+    }
+    
+    val listState = rememberLazyListState(
+        initialFirstVisibleItemIndex = scrollPosition,
+        initialFirstVisibleItemScrollOffset = scrollOffset
+    )
+
+    LaunchedEffect(isInEditMode, selectedRecordsList.size) {
+        val selectedIds = selectedRecordsList.map { it.timestamp.time.toString() }.toSet()
+        onStateChange(isInEditMode, selectedIds, expandedStatesMap.toMap(), 
+                     listState.firstVisibleItemIndex, listState.firstVisibleItemScrollOffset)
+    }
+
+    Box(modifier = Modifier.fillMaxSize()) {
+        Column(modifier = Modifier.fillMaxSize()) {
+            Box(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .padding(16.dp)
+                    .weight(1.0f)
+            ) {
+                if (mergedRecords.isEmpty()) {
+                    Box(
+                        modifier = Modifier.fillMaxSize(),
+                        contentAlignment = Alignment.Center
+                    ) {
+                        Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                            Text(
+                                "暂无合并记录",
+                                style = MaterialTheme.typography.titleLarge,
+                                color = MaterialTheme.colorScheme.outline
+                            )
+                            Text(
+                                "请检查合并设置或等待更多数据",
+                                style = MaterialTheme.typography.bodyMedium,
+                                color = MaterialTheme.colorScheme.outline.copy(alpha = 0.7f)
+                            )
+                        }
+                    }
+                } else {
+                    LazyColumn(
+                        state = listState,
+                        modifier = Modifier.fillMaxSize(),
+                        verticalArrangement = Arrangement.spacedBy(8.dp)
+                    ) {
+                        items(mergedRecords) { mergedRecord ->
+                            MergedRecordCard(
+                                mergedRecord = mergedRecord,
+                                isExpanded = expandedStatesMap[mergedRecord.groupKey] == true,
+                                onExpandToggle = {
+                                    expandedStatesMap[mergedRecord.groupKey] = 
+                                        !(expandedStatesMap[mergedRecord.groupKey] ?: false)
+                                },
+                                locoInfoUtil = locoInfoUtil
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+private fun MergedRecordCard(
+    mergedRecord: MergedTrainRecord,
+    isExpanded: Boolean,
+    onExpandToggle: () -> Unit,
+    locoInfoUtil: LocoInfoUtil?
+) {
+    val record = mergedRecord.latestRecord
+    val recordMap = record.toMap(showDetailedTime = true)
+
+    Card(
+        modifier = Modifier.fillMaxWidth(),
+        elevation = CardDefaults.cardElevation(defaultElevation = 2.dp),
+        colors = CardDefaults.cardColors(
+            containerColor = MaterialTheme.colorScheme.surface
+        ),
+        shape = RoundedCornerShape(8.dp)
+    ) {
+        Box(
+            modifier = Modifier
+                .fillMaxWidth()
+                .combinedClickable(
+                    onClick = onExpandToggle,
+                    interactionSource = remember { MutableInteractionSource() },
+                    indication = rememberRipple(bounded = true)
+                )
+        ) {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 16.dp, vertical = 8.dp)
+            ) {
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    if (recordMap.containsKey("time")) {
+                        Column {
+                            recordMap["time"]?.split("\n")?.forEach { timeLine ->
+                                Text(
+                                    text = timeLine,
+                                    fontSize = 10.sp,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                                )
+                            }
+                        }
+                    }
+                    
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically,
+                        horizontalArrangement = Arrangement.spacedBy(8.dp)
+                    ) {
+                        Text(
+                            text = "${record.rssi} dBm",
+                            fontSize = 10.sp,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                }
+
+                Spacer(modifier = Modifier.height(2.dp))
+
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    val trainDisplay = recordMap["train"]?.toString() ?: "未知列车"
+
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically,
+                        horizontalArrangement = Arrangement.spacedBy(6.dp)
+                    ) {
+                        Text(
+                            text = trainDisplay,
+                            fontWeight = FontWeight.Bold,
+                            fontSize = 20.sp,
+                            color = MaterialTheme.colorScheme.primary
+                        )
+
+                        val directionText = when (record.direction) {
+                            1 -> "下"
+                            3 -> "上"
+                            else -> ""
+                        }
+
+                        if (directionText.isNotEmpty()) {
+                            Surface(
+                                shape = RoundedCornerShape(2.dp),
+                                color = MaterialTheme.colorScheme.onSurface,
+                                modifier = Modifier.size(20.dp)
+                            ) {
+                                Box(
+                                    modifier = Modifier.fillMaxSize(),
+                                    contentAlignment = Alignment.Center
+                                ) {
+                                    Text(
+                                        text = directionText,
+                                        fontSize = 12.sp,
+                                        fontWeight = FontWeight.Bold,
+                                        color = MaterialTheme.colorScheme.surface,
+                                        maxLines = 1,
+                                        modifier = Modifier.offset(y = (-2).dp)
+                                    )
+                                }
+                            }
+                        }
+                    }
+
+                    val formattedInfo = when {
+                        record.locoType.isNotEmpty() && record.loco.isNotEmpty() -> {
+                            val shortLoco = if (record.loco.length > 5) {
+                                record.loco.takeLast(5)
+                            } else {
+                                record.loco
+                            }
+                            "${record.locoType}-${shortLoco}"
+                        }
+                        record.locoType.isNotEmpty() -> record.locoType
+                        record.loco.isNotEmpty() -> record.loco
+                        else -> ""
+                    }
+                    
+                    if (formattedInfo.isNotEmpty() && formattedInfo != "<NUL>") {
+                        Text(
+                            text = formattedInfo,
+                            fontSize = 14.sp,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                }
+
+                Spacer(modifier = Modifier.height(8.dp))
+
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween
+                ) {
+                    val routeStr = record.route.trim()
+                    val isValidRoute = routeStr.isNotEmpty() && !routeStr.all { it == '*' }
+
+                    val position = record.position.trim()
+                    val isValidPosition = position.isNotEmpty() &&
+                            !position.all { it == '-' || it == '.' } &&
+                            position != "<NUL>"
+
+                    if (isValidRoute || isValidPosition) {
+                        Row(
+                            verticalAlignment = Alignment.CenterVertically,
+                            modifier = Modifier.height(24.dp),
+                            horizontalArrangement = Arrangement.spacedBy(4.dp)
+                        ) {
+                            if (isValidRoute) {
+                                Text(
+                                    text = "$routeStr",
+                                    fontSize = 16.sp,
+                                    color = MaterialTheme.colorScheme.onSurface,
+                                    modifier = Modifier.alignByBaseline()
+                                )
+                            }
+
+                            if (isValidPosition) {
+                                Text(
+                                    text = "${position}K",
+                                    fontSize = 16.sp,
+                                    color = MaterialTheme.colorScheme.onSurface,
+                                    modifier = Modifier.alignByBaseline()
+                                )
+                            }
+                        }
+                    }
+
+                    val speed = record.speed.trim()
+                    val isValidSpeed = speed.isNotEmpty() &&
+                            !speed.all { it == '*' || it == '-' } &&
+                            speed != "NUL" &&
+                            speed != "<NUL>"
+                    if (isValidSpeed) {
+                        Text(
+                            text = "${speed} km/h",
+                            fontSize = 16.sp,
+                            color = MaterialTheme.colorScheme.onSurface
+                        )
+                    }
+                }
+
+                if (locoInfoUtil != null && record.locoType.isNotEmpty() && record.loco.isNotEmpty()) {
+                    val locoInfoText = locoInfoUtil.getLocoInfoDisplay(record.locoType, record.loco)
+                    if (locoInfoText != null) {
+                        Spacer(modifier = Modifier.height(4.dp))
+                        Text(
+                            text = locoInfoText,
+                            fontSize = 14.sp,
+                            color = MaterialTheme.colorScheme.onSurface
+                        )
+                    }
+                }
+
+                if (isExpanded) {
+                    Spacer(modifier = Modifier.height(12.dp))
+                    Divider()
+                    Spacer(modifier = Modifier.height(8.dp))
+                    
+                    Text(
+                        "记录详情",
+                        style = MaterialTheme.typography.titleSmall,
+                        color = MaterialTheme.colorScheme.primary
+                    )
+                    
+                    Spacer(modifier = Modifier.height(8.dp))
+                    
+                    mergedRecord.records.forEach { recordItem ->
+                        val timeFormat = SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault())
+                        
+                        Column(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .padding(vertical = 4.dp)
+                        ) {
+                            Text(
+                                text = timeFormat.format(recordItem.timestamp),
+                                fontSize = 12.sp,
+                                fontWeight = FontWeight.Medium,
+                                color = MaterialTheme.colorScheme.onSurface
+                            )
+                            
+                            Row(
+                                modifier = Modifier.fillMaxWidth(),
+                                horizontalArrangement = Arrangement.SpaceBetween
+                            ) {
+                                val locationText = buildString {
+                                    if (recordItem.route.isNotEmpty() && recordItem.route != "<NUL>") {
+                                        append(recordItem.route)
+                                    }
+                                    if (recordItem.position.isNotEmpty() && recordItem.position != "<NUL>") {
+                                        if (isNotEmpty()) append(" ")
+                                        append("${recordItem.position}K")
+                                    }
+                                }
+                                
+                                Text(
+                                    text = locationText.ifEmpty { "位置未知" },
+                                    fontSize = 11.sp,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                                )
+                                
+                                Row(
+                                    horizontalArrangement = Arrangement.spacedBy(8.dp)
+                                ) {
+                                    val directionText = when (recordItem.direction) {
+                                        1 -> "下行"
+                                        3 -> "上行"
+                                        else -> "未知"
+                                    }
+                                    Text(
+                                        text = directionText,
+                                        fontSize = 11.sp,
+                                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                                    )
+                                    
+                                    val speedText = if (recordItem.speed.isNotEmpty() &&
+                                                       recordItem.speed != "<NUL>" &&
+                                                       !recordItem.speed.all { it == '*' || it == '-' }) {
+                                        "${recordItem.speed}km/h"
+                                    } else {
+                                        "速度未知"
+                                    }
+                                    Text(
+                                        text = speedText,
+                                        fontSize = 11.sp,
+                                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                                    )
+                                }
+                            }
+                        }
+                    }
+                    
+                    val coordinates = mergedRecord.getAllCoordinates()
+                    val recordsWithCoordinates = mergedRecord.records.filter { it.getCoordinates() != null }
+                    
+                    if (coordinates.isNotEmpty()) {
+                        Spacer(modifier = Modifier.height(12.dp))
+                        Text(
+                            "行进路径 (${coordinates.size}/${mergedRecord.records.size} 个记录有位置信息)",
+                            style = MaterialTheme.typography.titleSmall,
+                            color = MaterialTheme.colorScheme.primary
+                        )
+                        Spacer(modifier = Modifier.height(8.dp))
+                        
+                        Box(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .height(220.dp)
+                                .clip(RoundedCornerShape(8.dp)),
+                            contentAlignment = Alignment.Center
+                        ) {
+                            AndroidView(
+                                factory = { context ->
+                                    MapView(context).apply {
+                                        setTileSource(TileSourceFactory.MAPNIK)
+                                        setMultiTouchControls(true)
+                                        zoomController.setVisibility(org.osmdroid.views.CustomZoomButtonsController.Visibility.NEVER)
+                                        
+                                        try {
+                                            val railwayTileSource = XYTileSource(
+                                                "OpenRailwayMap", 8, 16, 256, ".png",
+                                                arrayOf(
+                                                    "https://a.tiles.openrailwaymap.org/standard/",
+                                                    "https://b.tiles.openrailwaymap.org/standard/",
+                                                    "https://c.tiles.openrailwaymap.org/standard/"
+                                                ),
+                                                "© OpenRailwayMap contributors, © OpenStreetMap contributors"
+                                            )
+                                            val railwayProvider = MapTileProviderBasic(context)
+                                            railwayProvider.tileSource = railwayTileSource
+                                            val railwayOverlay = TilesOverlay(railwayProvider, context)
+                                            overlays.add(railwayOverlay)
+                                        } catch (e: Exception) {
+                                            e.printStackTrace()
+                                        }
+                                        
+                                        if (coordinates.size > 1) {
+                                            val polyline = Polyline().apply {
+                                                setPoints(coordinates)
+                                                outlinePaint.color = android.graphics.Color.BLUE
+                                                outlinePaint.strokeWidth = 5f
+                                            }
+                                            overlays.add(polyline)
+                                        }
+                                        
+                                        coordinates.forEachIndexed { index, coord ->
+                                            val marker = Marker(this).apply {
+                                                position = coord
+                                                title = when (index) {
+                                                    0 -> "起点"
+                                                    coordinates.lastIndex -> "终点"
+                                                    else -> "经过点 ${index + 1}"
+                                                }
+                                            }
+                                            overlays.add(marker)
+                                        }
+                                        
+                                        val centerLat = coordinates.map { it.latitude }.average()
+                                        val centerLon = coordinates.map { it.longitude }.average()
+                                        controller.setCenter(org.osmdroid.util.GeoPoint(centerLat, centerLon))
+                                        controller.setZoom(12.0)
+                                    }
+                                },
+                                update = { mapView ->
+                                    mapView.invalidate()
+                                }
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

app/src/main/java/org/noxylva/lbjconsole/ui/screens/SettingsScreen.kt

@@ -2,12 +2,24 @@ package org.noxylva.lbjconsole.ui.screens
 
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
 import androidx.compose.ui.platform.LocalUriHandler
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
+import org.noxylva.lbjconsole.model.MergeSettings
+import org.noxylva.lbjconsole.model.GroupBy
+import org.noxylva.lbjconsole.model.TimeWindow
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.runtime.LaunchedEffect
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -15,44 +27,220 @@ fun SettingsScreen(
     deviceName: String,
     onDeviceNameChange: (String) -> Unit,
     onApplySettings: () -> Unit,
-    appVersion: String = "Unknown"
+    appVersion: String = "Unknown",
+    mergeSettings: MergeSettings,
+    onMergeSettingsChange: (MergeSettings) -> Unit,
+    scrollPosition: Int = 0,
+    onScrollPositionChange: (Int) -> Unit = {}
 ) {
     val uriHandler = LocalUriHandler.current
+    val scrollState = rememberScrollState()
+    
+    LaunchedEffect(scrollPosition) {
+        scrollState.scrollTo(scrollPosition)
+    }
+    
+    LaunchedEffect(scrollState.value) {
+        onScrollPositionChange(scrollState.value)
+    }
+    
+    LaunchedEffect(deviceName) {
+        onApplySettings()
+    }
     
     Column(
         modifier = Modifier
             .fillMaxSize()
-            .padding(16.dp),
+            .verticalScroll(scrollState)
-        horizontalAlignment = Alignment.CenterHorizontally
+            .padding(20.dp),
+        verticalArrangement = Arrangement.spacedBy(20.dp)
+    ) {
+        Card(
+            modifier = Modifier.fillMaxWidth(),
+            colors = CardDefaults.cardColors(
+                containerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.3f)
+            ),
+            shape = RoundedCornerShape(16.dp)
         ) {
             Column(
-            horizontalAlignment = Alignment.CenterHorizontally,
+                modifier = Modifier.padding(20.dp),
                 verticalArrangement = Arrangement.spacedBy(16.dp)
             ) {
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(12.dp)
+                ) {
+                    Icon(
+                        imageVector = Icons.Default.Bluetooth,
+                        contentDescription = null,
+                        tint = MaterialTheme.colorScheme.primary
+                    )
+                    Text(
+                        "蓝牙设备",
+                        style = MaterialTheme.typography.titleMedium,
+                        fontWeight = FontWeight.SemiBold
+                    )
+                }
+                
                 OutlinedTextField(
                     value = deviceName,
                     onValueChange = onDeviceNameChange,
-                label = { Text("蓝牙设备名称") },
+                    label = { Text("设备名称") },
-                modifier = Modifier.fillMaxWidth(),
+                    leadingIcon = {
+                        Icon(
+                            imageVector = Icons.Default.DeviceHub,
+                            contentDescription = null
                         )
+                    },
+                    modifier = Modifier.fillMaxWidth(),
+                    shape = RoundedCornerShape(12.dp)
+                )
+            }
+        }
         
-            Button(
+        Card(
-                onClick = onApplySettings,
+            modifier = Modifier.fillMaxWidth(),
-                modifier = Modifier.fillMaxWidth()
+            colors = CardDefaults.cardColors(
+                containerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.3f)
+            ),
+            shape = RoundedCornerShape(16.dp)
         ) {
-                Text("应用设置")
+            Column(
+                modifier = Modifier.padding(20.dp),
+                verticalArrangement = Arrangement.spacedBy(16.dp)
+            ) {
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(12.dp)
+                ) {
+                    Icon(
+                        imageVector = Icons.Default.MergeType,
+                        contentDescription = null,
+                        tint = MaterialTheme.colorScheme.primary
+                    )
+                    Text(
+                        "记录合并",
+                        style = MaterialTheme.typography.titleMedium,
+                        fontWeight = FontWeight.SemiBold
+                    )
+                }
+                
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(
+                         "启用记录合并",
+                         style = MaterialTheme.typography.bodyMedium
+                     )
+                    Switch(
+                        checked = mergeSettings.enabled,
+                        onCheckedChange = { enabled ->
+                            onMergeSettingsChange(mergeSettings.copy(enabled = enabled))
+                        }
+                    )
+                }
+                
+                if (mergeSettings.enabled) {
+                    var groupByExpanded by remember { mutableStateOf(false) }
+                    var timeWindowExpanded by remember { mutableStateOf(false) }
+                    
+                    ExposedDropdownMenuBox(
+                        expanded = groupByExpanded,
+                        onExpandedChange = { groupByExpanded = !groupByExpanded }
+                    ) {
+                        OutlinedTextField(
+                            value = mergeSettings.groupBy.displayName,
+                            onValueChange = {},
+                            readOnly = true,
+                            label = { Text("分组方式") },
+                            leadingIcon = {
+                                Icon(
+                                    imageVector = Icons.Default.Group,
+                                    contentDescription = null
+                                )
+                            },
+                            trailingIcon = {
+                                ExposedDropdownMenuDefaults.TrailingIcon(expanded = groupByExpanded)
+                            },
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .menuAnchor(),
+                            shape = RoundedCornerShape(12.dp)
+                        )
+                        ExposedDropdownMenu(
+                            expanded = groupByExpanded,
+                            onDismissRequest = { groupByExpanded = false }
+                        ) {
+                            GroupBy.values().forEach { groupBy ->
+                                DropdownMenuItem(
+                                    text = { Text(groupBy.displayName) },
+                                    onClick = {
+                                        onMergeSettingsChange(mergeSettings.copy(groupBy = groupBy))
+                                        groupByExpanded = false
+                                    }
+                                )
+                            }
                         }
                     }
                     
-        Spacer(modifier = Modifier.weight(1f))
+                    ExposedDropdownMenuBox(
+                        expanded = timeWindowExpanded,
+                        onExpandedChange = { timeWindowExpanded = !timeWindowExpanded }
+                    ) {
+                        OutlinedTextField(
+                            value = mergeSettings.timeWindow.displayName,
+                            onValueChange = {},
+                            readOnly = true,
+                            label = { Text("时间窗口") },
+                            leadingIcon = {
+                                Icon(
+                                    imageVector = Icons.Default.Schedule,
+                                    contentDescription = null
+                                )
+                            },
+                            trailingIcon = {
+                                ExposedDropdownMenuDefaults.TrailingIcon(expanded = timeWindowExpanded)
+                            },
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .menuAnchor(),
+                            shape = RoundedCornerShape(12.dp)
+                        )
+                        ExposedDropdownMenu(
+                            expanded = timeWindowExpanded,
+                            onDismissRequest = { timeWindowExpanded = false }
+                        ) {
+                            TimeWindow.values().forEach { timeWindow ->
+                                DropdownMenuItem(
+                                    text = { Text(timeWindow.displayName) },
+                                    onClick = {
+                                        onMergeSettingsChange(mergeSettings.copy(timeWindow = timeWindow))
+                                        timeWindowExpanded = false
+                                    }
+                                )
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        
+        Spacer(modifier = Modifier.height(20.dp))
         
         Text(
              text = "LBJ Console v$appVersion by undef-i",
              style = MaterialTheme.typography.bodySmall,
              color = MaterialTheme.colorScheme.onSurfaceVariant,
-            modifier = Modifier.clickable {
+             textAlign = TextAlign.Center,
+             modifier = Modifier
+                 .fillMaxWidth()
+                 .clip(RoundedCornerShape(12.dp))
+                 .clickable {
                      uriHandler.openUri("https://github.com/undef-i")
                  }
+                 .padding(16.dp)
          )
     }
 }