feat: 添加趋势分析图表

- 新增趋势图组件，分别显示收入和支出折线
- 更新分析页面ViewModel，处理趋势数据
- 修改分析页面，集成趋势图显示
- 支持深色/浅色主题适配
- 优化图表布局和可读性

app/src/main/java/com/yovinchen/bookkeeping/ui/components/TrendLineChart.kt

@@ -0,0 +1,173 @@
+package com.yovinchen.bookkeeping.ui.components
+
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.*
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.toArgb
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.viewinterop.AndroidView
+import com.github.mikephil.charting.charts.LineChart
+import com.github.mikephil.charting.components.XAxis
+import com.github.mikephil.charting.data.Entry
+import com.github.mikephil.charting.data.LineData
+import com.github.mikephil.charting.data.LineDataSet
+import com.github.mikephil.charting.formatter.ValueFormatter
+import com.yovinchen.bookkeeping.model.BookkeepingRecord
+import com.yovinchen.bookkeeping.model.TransactionType
+import java.text.SimpleDateFormat
+import java.util.*
+
+@Composable
+fun TrendLineChart(
+    records: List<BookkeepingRecord>,
+    modifier: Modifier = Modifier
+) {
+    val isDarkTheme = isSystemInDarkTheme()
+    var textColor = if (isDarkTheme) {
+        MaterialTheme.colorScheme.onSurface.copy(alpha = 0.87f).toArgb()
+    } else {
+        MaterialTheme.colorScheme.onSurface.toArgb()
+    }
+    
+    var gridColor = if (isDarkTheme) {
+        MaterialTheme.colorScheme.onSurface.copy(alpha = 0.2f).toArgb()
+    } else {
+        MaterialTheme.colorScheme.onSurface.copy(alpha = 0.1f).toArgb()
+    }
+
+    val incomeColor = MaterialTheme.colorScheme.primary.toArgb()
+    val expenseColor = MaterialTheme.colorScheme.error.toArgb()
+
+    AndroidView(
+        modifier = modifier
+            .fillMaxWidth()
+            .height(300.dp),
+        factory = { context ->
+            LineChart(context).apply {
+                description.isEnabled = false
+                
+                // 基本设置
+                setDrawGridBackground(false)
+                setDrawBorders(false)
+                
+                // X轴设置
+                xAxis.apply {
+                    position = XAxis.XAxisPosition.BOTTOM
+                    this.textColor = textColor
+                    this.gridColor = gridColor
+                    setDrawGridLines(true)
+                    setDrawAxisLine(true)
+                    labelRotationAngle = -45f
+                    textSize = 12f
+                    yOffset = 10f
+                }
+
+                // Y轴设置
+                axisLeft.apply {
+                    this.textColor = textColor
+                    this.gridColor = gridColor
+                    setDrawGridLines(true)
+                    setDrawAxisLine(true)
+                    textSize = 12f
+                    valueFormatter = object : ValueFormatter() {
+                        override fun getFormattedValue(value: Float): String {
+                            return String.format("%.0f", value)
+                        }
+                    }
+                }
+                axisRight.isEnabled = false
+
+                // 图例设置
+                legend.apply {
+                    this.textColor = textColor
+                    this.textSize = 12f
+                    isEnabled = true
+                    yOffset = 10f
+                }
+
+                // 交互设置
+                setTouchEnabled(true)
+                isDragEnabled = true
+                setScaleEnabled(true)
+                
+                // 边距设置
+                setExtraOffsets(8f, 16f, 8f, 24f)
+            }
+        },
+        update = { chart ->
+            // 按日期分组计算收入和支出
+            val dailyData = records
+                .groupBy { record ->
+                    SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()).format(record.date)
+                }
+                .mapValues { (_, dayRecords) ->
+                    val income = dayRecords
+                        .filter { it.type == TransactionType.INCOME }
+                        .sumOf { it.amount }
+                        .toFloat()
+                    val expense = dayRecords
+                        .filter { it.type == TransactionType.EXPENSE }
+                        .sumOf { it.amount }
+                        .toFloat()
+                    Pair(income, expense)
+                }
+                .toList()
+                .sortedBy { it.first }
+
+            // 创建收入数据点
+            val incomeEntries = dailyData.mapIndexed { index, (_, amounts) ->
+                Entry(index.toFloat(), amounts.first)
+            }
+
+            // 创建支出数据点
+            val expenseEntries = dailyData.mapIndexed { index, (_, amounts) ->
+                Entry(index.toFloat(), amounts.second)
+            }
+
+            // 创建收入数据集
+            val incomeDataSet = LineDataSet(incomeEntries, "收入").apply {
+                color = incomeColor
+                lineWidth = 2.5f
+                setDrawCircles(true)
+                circleRadius = 4f
+                setCircleColor(incomeColor)
+                valueTextColor = textColor
+                valueTextSize = 12f
+                setDrawFilled(true)
+                fillColor = incomeColor
+                fillAlpha = if (isDarkTheme) 40 else 50
+            }
+
+            // 创建支出数据集
+            val expenseDataSet = LineDataSet(expenseEntries, "支出").apply {
+                color = expenseColor
+                lineWidth = 2.5f
+                setDrawCircles(true)
+                circleRadius = 4f
+                setCircleColor(expenseColor)
+                valueTextColor = textColor
+                valueTextSize = 12f
+                setDrawFilled(true)
+                fillColor = expenseColor
+                fillAlpha = if (isDarkTheme) 40 else 50
+            }
+
+            // 设置X轴标签
+            chart.xAxis.valueFormatter = object : ValueFormatter() {
+                override fun getFormattedValue(value: Float): String {
+                    return try {
+                        dailyData[value.toInt()].first.substring(5) // 只显示MM-dd
+                    } catch (e: Exception) {
+                        ""
+                    }
+                }
+            }
+
+            // 更新图表数据
+            chart.data = LineData(incomeDataSet, expenseDataSet)
+            chart.invalidate()
+        }
+    )
+}

app/src/main/java/com/yovinchen/bookkeeping/ui/screen/AnalysisScreen.kt

@@ -38,6 +38,7 @@ import com.yovinchen.bookkeeping.model.MemberStat
 import com.yovinchen.bookkeeping.ui.components.CategoryPieChart
 import com.yovinchen.bookkeeping.ui.components.CategoryStatItem
 import com.yovinchen.bookkeeping.ui.components.DateRangePicker
+import com.yovinchen.bookkeeping.ui.components.TrendLineChart
 import com.yovinchen.bookkeeping.viewmodel.AnalysisViewModel
 import java.time.YearMonth
 
@@ -58,6 +59,7 @@ fun AnalysisScreen(
     val selectedAnalysisType by viewModel.selectedAnalysisType.collectAsState()
     val categoryStats by viewModel.categoryStats.collectAsState()
     val memberStats by viewModel.memberStats.collectAsState()
+    val records by viewModel.records.collectAsState()
 
     var showViewModeMenu by remember { mutableStateOf(false) }
     var currentViewMode by rememberSaveable { mutableStateOf(ViewMode.CATEGORY) }
@@ -141,43 +143,59 @@ fun AnalysisScreen(
                 modifier = Modifier.fillMaxSize(),
                 contentPadding = PaddingValues(16.dp)
             ) {
-                // 添加饼图作为第一个项目
+                when (selectedAnalysisType) {
-                if (selectedAnalysisType != AnalysisType.TREND) {
+                    AnalysisType.TREND -> {
-                    item {
+                        // 趋势视图
-                        CategoryPieChart(
+                        item {
-                            categoryData = categoryStats.map { Pair(it.category, it.percentage.toFloat()) },
+                            if (records.isNotEmpty()) {
-                            memberData = memberStats.map { Pair(it.member, it.percentage.toFloat()) },
+                                TrendLineChart(
-                            currentViewMode = currentViewMode == ViewMode.MEMBER,
+                                    records = records,
-                            modifier = Modifier
+                                    modifier = Modifier
-                                .fillMaxWidth()
+                                        .fillMaxWidth()
-                                .height(200.dp)
+                                        .height(300.dp)
-                                .padding(bottom = 16.dp),
+                                        .padding(vertical = 16.dp)
-                            onCategoryClick = { category ->
+                                )
-                                if (currentViewMode == ViewMode.CATEGORY) {
-                                    onNavigateToCategoryDetail(category, startMonth, endMonth)
-                                } else {
-                                    onNavigateToMemberDetail(category, startMonth, endMonth, selectedAnalysisType)
-                                }
-                            }
-                        )
-                    }
-                }
-
-                // 添加统计列表项目
-                items(if (currentViewMode == ViewMode.CATEGORY) categoryStats else memberStats) { stat ->
-                    val category = if (stat is CategoryStat) stat.category else null
-                    val member = if (stat is MemberStat) stat.member else null
-
-                    CategoryStatItem(
-                        stat = stat,
-                        onClick = {
-                            if (currentViewMode == ViewMode.CATEGORY && category != null) {
-                                onNavigateToCategoryDetail(category, startMonth, endMonth)
-                            } else if (currentViewMode == ViewMode.MEMBER && member != null) {
-                                onNavigateToMemberDetail(member, startMonth, endMonth, selectedAnalysisType)
                             }
                         }
-                    )
+                    }
+                    else -> {
+                        // 饼图视图
+                        item {
+                            CategoryPieChart(
+                                categoryData = categoryStats.map { Pair(it.category, it.percentage.toFloat()) },
+                                memberData = memberStats.map { Pair(it.member, it.percentage.toFloat()) },
+                                currentViewMode = currentViewMode == ViewMode.MEMBER,
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .height(200.dp)
+                                    .padding(bottom = 16.dp),
+                                onCategoryClick = { category ->
+                                    if (currentViewMode == ViewMode.CATEGORY) {
+                                        onNavigateToCategoryDetail(category, startMonth, endMonth)
+                                    } else {
+                                        onNavigateToMemberDetail(category, startMonth, endMonth, selectedAnalysisType)
+                                    }
+                                }
+                            )
+                        }
+
+                        // 统计列表
+                        items(if (currentViewMode == ViewMode.CATEGORY) categoryStats else memberStats) { stat ->
+                            val category = if (stat is CategoryStat) stat.category else null
+                            val member = if (stat is MemberStat) stat.member else null
+
+                            CategoryStatItem(
+                                stat = stat,
+                                onClick = {
+                                    if (currentViewMode == ViewMode.CATEGORY && category != null) {
+                                        onNavigateToCategoryDetail(category, startMonth, endMonth)
+                                    } else if (currentViewMode == ViewMode.MEMBER && member != null) {
+                                        onNavigateToMemberDetail(member, startMonth, endMonth, selectedAnalysisType)
+                                    }
+                                }
+                            )
+                        }
+                    }
                 }
             }
         }

app/src/main/java/com/yovinchen/bookkeeping/viewmodel/AnalysisViewModel.kt

@@ -5,6 +5,7 @@ import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.yovinchen.bookkeeping.data.BookkeepingDatabase
 import com.yovinchen.bookkeeping.model.AnalysisType
+import com.yovinchen.bookkeeping.model.BookkeepingRecord
 import com.yovinchen.bookkeeping.model.CategoryStat
 import com.yovinchen.bookkeeping.model.MemberStat
 import com.yovinchen.bookkeeping.model.TransactionType
@@ -34,6 +35,9 @@ class AnalysisViewModel(application: Application) : AndroidViewModel(application
     private val _memberStats = MutableStateFlow<List<MemberStat>>(emptyList())
     val memberStats: StateFlow<List<MemberStat>> = _memberStats.asStateFlow()
 
+    private val _records = MutableStateFlow<List<BookkeepingRecord>>(emptyList())
+    val records: StateFlow<List<BookkeepingRecord>> = _records.asStateFlow()
+
     init {
         viewModelScope.launch {
             combine(startMonth, endMonth, selectedAnalysisType) { start, end, type ->
@@ -58,21 +62,40 @@ class AnalysisViewModel(application: Application) : AndroidViewModel(application
 
     private suspend fun updateStats(startMonth: YearMonth, endMonth: YearMonth, type: AnalysisType) {
         val records = recordDao.getAllRecords().first()
+        
+        // 过滤日期范围内的记录
         val monthRecords = records.filter {
             val recordDate = Date(it.date.time)
             val localDateTime = LocalDateTime.ofInstant(recordDate.toInstant(), ZoneId.systemDefault())
             val yearMonth = YearMonth.from(localDateTime)
             yearMonth.isAfter(startMonth.minusMonths(1)) && 
-            yearMonth.isBefore(endMonth.plusMonths(1)) && 
+            yearMonth.isBefore(endMonth.plusMonths(1))
-            it.type == when(type) {
+        }
-                AnalysisType.EXPENSE -> TransactionType.EXPENSE
+
-                AnalysisType.INCOME -> TransactionType.INCOME
+        // 更新记录数据
-                else -> null
+        _records.value = monthRecords
+
+        // 根据分析类型过滤记录
+        val filteredRecords = if (type == AnalysisType.TREND) {
+            monthRecords
+        } else {
+            monthRecords.filter {
+                it.type == when(type) {
+                    AnalysisType.EXPENSE -> TransactionType.EXPENSE
+                    AnalysisType.INCOME -> TransactionType.INCOME
+                    else -> return@filter true
+                }
             }
         }
 
+        // 更新统计数据
+        updateCategoryStats(filteredRecords)
+        updateMemberStats(filteredRecords)
+    }
+
+    private suspend fun updateCategoryStats(records: List<BookkeepingRecord>) {
         // 按分类统计
-        val categoryMap = monthRecords.groupBy { it.category }
+        val categoryMap = records.groupBy { it.category }
         val categoryStats = categoryMap.map { (category, records) ->
             CategoryStat(
                 category = category,
@@ -87,9 +110,13 @@ class AnalysisViewModel(application: Application) : AndroidViewModel(application
             it.copy(percentage = if (categoryTotal > 0) it.amount / categoryTotal * 100 else 0.0) 
         }
 
+        _categoryStats.value = categoryStatsWithPercentage
+    }
+
+    private suspend fun updateMemberStats(records: List<BookkeepingRecord>) {
         // 按成员统计
         val members = memberDao.getAllMembers().first()
-        val memberMap = monthRecords.groupBy { record ->
+        val memberMap = records.groupBy { record ->
             members.find { it.id == record.memberId }?.name ?: "未分配"
         }
         
@@ -107,7 +134,6 @@ class AnalysisViewModel(application: Application) : AndroidViewModel(application
             it.copy(percentage = if (memberTotal > 0) it.amount / memberTotal * 100 else 0.0) 
         }
 
-        _categoryStats.value = categoryStatsWithPercentage
         _memberStats.value = memberStatsWithPercentage
     }
 }