feat: 优化记账分析功能

- 重构导航系统，支持更细粒度的页面跳转
- 增强数据访问层，添加新的查询方法
- 优化界面布局和交互体验
- 添加成员分布分析功能
- 改进日期和金额的显示方式

.idea/misc.xml

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">

app/src/main/java/com/yovinchen/bookkeeping/data/BookkeepingDao.kt

@@ -3,6 +3,7 @@ package com.yovinchen.bookkeeping.data
 import androidx.room.*
 import com.yovinchen.bookkeeping.model.BookkeepingRecord
 import com.yovinchen.bookkeeping.model.Category
+import com.yovinchen.bookkeeping.model.CategoryStat
 import com.yovinchen.bookkeeping.model.TransactionType
 import kotlinx.coroutines.flow.Flow
 import java.util.Date
@@ -49,6 +50,37 @@ interface BookkeepingDao {
         yearMonth: String
     ): Flow<List<BookkeepingRecord>>
 
+    @Query("""
+        SELECT m.name as category, 
+        SUM(r.amount) as amount,
+        COUNT(*) as count,
+        (SUM(r.amount) * 100.0 / (
+            SELECT SUM(amount) 
+            FROM bookkeeping_records 
+            WHERE category = :category 
+            AND strftime('%Y-%m', datetime(date/1000, 'unixepoch')) = :yearMonth
+        )) as percentage
+        FROM bookkeeping_records r
+        JOIN members m ON r.memberId = m.id
+        WHERE r.category = :category
+        AND strftime('%Y-%m', datetime(r.date/1000, 'unixepoch')) = :yearMonth
+        GROUP BY m.name
+        ORDER BY amount DESC
+    """)
+    fun getMemberStatsByCategory(
+        category: String,
+        yearMonth: String
+    ): Flow<List<CategoryStat>>
+
+    @Query("""
+        SELECT * FROM bookkeeping_records 
+        WHERE category = :category
+        ORDER BY date DESC
+    """)
+    fun getRecordsByCategory(
+        category: String
+    ): Flow<List<BookkeepingRecord>>
+
     @Insert
     suspend fun insertRecord(record: BookkeepingRecord): Long
 
@@ -75,4 +107,18 @@ interface BookkeepingDao {
 
     @Query("UPDATE bookkeeping_records SET category = :newName WHERE category = :oldName")
     suspend fun updateRecordCategories(oldName: String, newName: String)
+
+    @Query("""
+        SELECT * FROM bookkeeping_records 
+        WHERE memberId IN (SELECT id FROM members WHERE name = :memberName)
+        AND category = :category
+        AND date BETWEEN :startDate AND :endDate
+        ORDER BY date DESC
+    """)
+    suspend fun getRecordsByMemberAndCategory(
+        memberName: String,
+        category: String,
+        startDate: Date,
+        endDate: Date
+    ): List<BookkeepingRecord>
 }

app/src/main/java/com/yovinchen/bookkeeping/data/Converters.kt

@@ -3,6 +3,7 @@ package com.yovinchen.bookkeeping.data
 import androidx.room.TypeConverter
 import java.time.LocalDateTime
 import java.time.format.DateTimeFormatter
+import java.util.*
 
 class Converters {
     private val formatter = DateTimeFormatter.ISO_LOCAL_DATE_TIME
@@ -18,4 +19,14 @@ class Converters {
     fun dateToTimestamp(date: LocalDateTime?): String? {
         return date?.format(formatter)
     }
+
+    @TypeConverter
+    fun fromDate(value: Date?): String? {
+        return value?.time?.toString()
+    }
+
+    @TypeConverter
+    fun toDate(timestamp: String?): Date? {
+        return timestamp?.let { Date(it.toLong()) }
+    }
 }

app/src/main/java/com/yovinchen/bookkeeping/ui/navigation/MainNavigation.kt

@@ -2,11 +2,9 @@ package com.yovinchen.bookkeeping.ui.navigation
 
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.Home
-import androidx.compose.material.icons.filled.List
+import androidx.compose.material.icons.automirrored.filled.List
+import androidx.compose.material.icons.filled.Analytics
 import androidx.compose.material.icons.filled.Settings
-import androidx.compose.material.icons.outlined.Analytics
-import androidx.compose.material.icons.outlined.Home
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.NavigationBar
@@ -31,27 +29,25 @@ import java.time.format.DateTimeFormatter
 
 sealed class Screen(
     val route: String,
-    val icon: ImageVector? = null,
-    val label: String? = null
+    val title: String,
+    val icon: ImageVector? = null
 ) {
-    data object Home : Screen("home", Icons.Outlined.Home, "首页")
-    data object Analysis : Screen("analysis", Icons.Outlined.Analytics, "分析")
-    data object Settings : Screen("settings", Icons.Default.Settings, "设置")
-    data object CategoryDetail : Screen(
-        "category/{category}/{yearMonth}",
-        Icons.Default.List,
-        "分类详情"
-    ) {
-        fun createRoute(category: String, yearMonth: YearMonth): String =
-            "category/$category/${yearMonth.format(DateTimeFormatter.ofPattern("yyyy-MM"))}"
+    object Home : Screen("home", "记账", Icons.AutoMirrored.Filled.List)
+    object Analysis : Screen("analysis", "分析", Icons.Default.Analytics)
+    object Settings : Screen("settings", "设置", Icons.Default.Settings)
+    object CategoryDetail : Screen("category_detail/{category}/{yearMonth}", "分类详情") {
+        fun createRoute(category: String, yearMonth: YearMonth): String {
+            return "category_detail/$category/${yearMonth.format(DateTimeFormatter.ofPattern("yyyy-MM"))}"
         }
-    data object MemberDetail : Screen(
-        "member/{memberName}/{yearMonth}",
-        Icons.Default.List,
-        "成员详情"
-    ) {
-        fun createRoute(memberName: String, yearMonth: YearMonth): String =
-            "member/$memberName/${yearMonth.format(DateTimeFormatter.ofPattern("yyyy-MM"))}"
+    }
+    object MemberDetail : Screen("member_detail/{memberName}/{category}/{yearMonth}", "成员详情") {
+        fun createRoute(memberName: String, category: String, yearMonth: YearMonth): String {
+            return "member_detail/$memberName/$category/${yearMonth.format(DateTimeFormatter.ofPattern("yyyy-MM"))}"
+        }
+    }
+
+    companion object {
+        fun bottomNavigationItems() = listOf(Home, Analysis, Settings)
     }
 }
 
@@ -69,14 +65,10 @@ fun MainNavigation(
                 val navBackStackEntry by navController.currentBackStackEntryAsState()
                 val currentRoute = navBackStackEntry?.destination?.route
 
-                listOf(
-                    Screen.Home,
-                    Screen.Analysis,
-                    Screen.Settings
-                ).forEach { screen ->
+                Screen.bottomNavigationItems().forEach { screen ->
                     NavigationBarItem(
-                        icon = { Icon(screen.icon!!, contentDescription = screen.label) },
-                        label = { Text(screen.label!!) },
+                        icon = { Icon(screen.icon!!, contentDescription = screen.title) },
+                        label = { Text(screen.title) },
                         selected = currentRoute == screen.route,
                         onClick = {
                             navController.navigate(screen.route) {
@@ -105,7 +97,9 @@ fun MainNavigation(
                         navController.navigate(Screen.CategoryDetail.createRoute(category, yearMonth))
                     },
                     onNavigateToMemberDetail = { memberName, yearMonth ->
-                        navController.navigate(Screen.MemberDetail.createRoute(memberName, yearMonth))
+                        // 在这里我们暂时使用一个默认分类，你需要根据实际情况修改这里的逻辑
+                        val defaultCategory = "默认"
+                        navController.navigate(Screen.MemberDetail.createRoute(memberName, defaultCategory, yearMonth))
                     }
                 )
             }
@@ -126,11 +120,15 @@ fun MainNavigation(
             ) { backStackEntry ->
                 val category = backStackEntry.arguments?.getString("category") ?: return@composable
                 val yearMonthStr = backStackEntry.arguments?.getString("yearMonth") ?: return@composable
-                val yearMonth = YearMonth.parse(yearMonthStr, DateTimeFormatter.ofPattern("yyyy-MM"))
+                val yearMonth = YearMonth.parse(yearMonthStr)
+
                 CategoryDetailScreen(
                     category = category,
-                    month = yearMonth,
-                    onBack = { navController.popBackStack() }
+                    yearMonth = yearMonth,
+                    onNavigateBack = { navController.popBackStack() },
+                    onNavigateToMemberDetail = { memberName ->
+                        navController.navigate(Screen.MemberDetail.createRoute(memberName, category, yearMonth))
+                    }
                 )
             }
 
@@ -138,14 +136,18 @@ fun MainNavigation(
                 route = Screen.MemberDetail.route,
                 arguments = listOf(
                     navArgument("memberName") { type = NavType.StringType },
+                    navArgument("category") { type = NavType.StringType },
                     navArgument("yearMonth") { type = NavType.StringType }
                 )
             ) { backStackEntry ->
                 val memberName = backStackEntry.arguments?.getString("memberName") ?: return@composable
+                val category = backStackEntry.arguments?.getString("category") ?: return@composable
                 val yearMonthStr = backStackEntry.arguments?.getString("yearMonth") ?: return@composable
-                val yearMonth = YearMonth.parse(yearMonthStr, DateTimeFormatter.ofPattern("yyyy-MM"))
+                val yearMonth = YearMonth.parse(yearMonthStr)
+
                 MemberDetailScreen(
                     memberName = memberName,
+                    category = category,
                     yearMonth = yearMonth,
                     onNavigateBack = { navController.popBackStack() }
                 )

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

@@ -4,135 +4,130 @@ import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.yovinchen.bookkeeping.data.BookkeepingDatabase
 import com.yovinchen.bookkeeping.model.BookkeepingRecord
+import com.yovinchen.bookkeeping.ui.components.CategoryPieChart
 import com.yovinchen.bookkeeping.ui.components.RecordItem
 import com.yovinchen.bookkeeping.viewmodel.CategoryDetailViewModel
 import com.yovinchen.bookkeeping.viewmodel.CategoryDetailViewModelFactory
+import java.text.NumberFormat
 import java.text.SimpleDateFormat
 import java.time.YearMonth
 import java.time.format.DateTimeFormatter
-import java.util.Locale
+import java.util.*
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun CategoryDetailScreen(
     category: String,
-    month: YearMonth,
-    onBack: () -> Unit
+    yearMonth: YearMonth,
+    onNavigateBack: () -> Unit,
+    onNavigateToMemberDetail: (String) -> Unit,
+    modifier: Modifier = Modifier
 ) {
     val context = LocalContext.current
     val database = remember { BookkeepingDatabase.getDatabase(context) }
     val viewModel: CategoryDetailViewModel = viewModel(
-        factory = CategoryDetailViewModelFactory(database, category, month)
+        factory = CategoryDetailViewModelFactory(database, category, yearMonth)
     )
 
     val records by viewModel.records.collectAsState()
+    val memberStats by viewModel.memberStats.collectAsState()
     val total by viewModel.total.collectAsState()
-    val members by viewModel.members.collectAsState()
-    val groupedRecords = remember(records) {
-        records.groupBy { record ->
-            SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()).format(record.date)
-        }
-    }
 
     Scaffold(
         topBar = {
             TopAppBar(
-                title = { Text("$category - ${month.format(DateTimeFormatter.ofPattern("yyyy年MM月"))}") },
+                title = { Text(category) },
                 navigationIcon = {
-                    IconButton(onClick = onBack) {
-                        Icon(Icons.Default.ArrowBack, contentDescription = "返回")
+                    IconButton(onClick = onNavigateBack) {
+                        Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = "返回")
                     }
                 }
             )
         }
     ) { padding ->
-        Column(
-            modifier = Modifier
+        LazyColumn(
+            modifier = modifier
                 .fillMaxSize()
-                .padding(padding)
-        ) {
-            // 总金额显示
-            Card(
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .padding(horizontal = 16.dp, vertical = 8.dp)
-            ) {
-                Row(
-                    modifier = Modifier
-                        .fillMaxWidth()
-                        .padding(horizontal = 16.dp, vertical = 12.dp),
-                    horizontalArrangement = Arrangement.SpaceBetween,
-                    verticalAlignment = Alignment.CenterVertically
+                .padding(padding),
+            horizontalAlignment = Alignment.CenterHorizontally
         ) {
+            item {
                 Text(
-                        text = "总金额",
-                        style = MaterialTheme.typography.titleMedium
+                    text = NumberFormat.getCurrencyInstance(Locale.CHINA).format(total),
+                    style = MaterialTheme.typography.headlineMedium,
+                    modifier = Modifier.padding(16.dp)
                 )
-                    Text(
-                        text = String.format("%.2f", total),
-                        style = MaterialTheme.typography.titleLarge
-                    )
-                }
             }
 
-            // 记录列表
-            LazyColumn(
-                modifier = Modifier.fillMaxSize(),
-                contentPadding = PaddingValues(16.dp),
-                verticalArrangement = Arrangement.spacedBy(8.dp)
-            ) {
+            item {
+                CategoryPieChart(
+                    categoryData = memberStats.map { Pair(it.category, it.percentage.toFloat()) },
+                    memberData = emptyList(),
+                    currentViewMode = false,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(16.dp),
+                    onCategoryClick = { memberName -> onNavigateToMemberDetail(memberName) }
+                )
+            }
+
+            // 按日期分组记录
+            val groupedRecords = records.groupBy { record ->
+                SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()).format(record.date)
+            }.toSortedMap(compareByDescending { it })
+
             groupedRecords.forEach { (date, dayRecords) ->
                 item {
                     Card(
                         modifier = Modifier
                             .fillMaxWidth()
-                                .padding(vertical = 4.dp),
-                            elevation = CardDefaults.cardElevation(defaultElevation = 2.dp)
+                            .padding(horizontal = 16.dp, vertical = 8.dp)
                     ) {
                         Column(
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .padding(16.dp)
                         ) {
-                                // 日期标签
+                            // 日期标题和总金额
+                            Row(
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .padding(bottom = 8.dp),
+                                horizontalArrangement = Arrangement.SpaceBetween
+                            ) {
                                 Text(
-                                    text = SimpleDateFormat(
-                                        "yyyy年MM月dd日 E",
-                                        Locale.CHINESE
-                                    ).format(dayRecords.first().date),
+                                    text = date,
                                     style = MaterialTheme.typography.titleMedium,
-                                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                                    fontWeight = FontWeight.Bold
                                 )
+                                Text(
+                                    text = NumberFormat.getCurrencyInstance(Locale.CHINA)
+                                        .format(dayRecords.sumOf { it.amount }),
+                                    style = MaterialTheme.typography.titleMedium,
+                                    color = MaterialTheme.colorScheme.error
+                                )
+                            }
 
                             Spacer(modifier = Modifier.height(8.dp))
 
-                                // 当天的记录
-                                Column(
-                                    modifier = Modifier.fillMaxWidth(),
-                                    verticalArrangement = Arrangement.spacedBy(4.dp)
-                                ) {
-                                    dayRecords.forEachIndexed { index, record ->
-                                        RecordItem(
-                                            record = record,
-                                            onClick = {},
-                                            members = members
-                                        )
-
-                                        if (index < dayRecords.size - 1) {
+                            // 当天的记录列表
+                            dayRecords.forEach { record ->
+                                RecordItem(record = record)
+                                if (record != dayRecords.last()) {
                                     HorizontalDivider(
-                                                modifier = Modifier.padding(vertical = 4.dp),
-                                                color = MaterialTheme.colorScheme.surfaceVariant,
-                                                thickness = 0.5.dp
+                                        modifier = Modifier.padding(vertical = 8.dp),
+                                        color = MaterialTheme.colorScheme.outlineVariant
                                     )
                                 }
                             }
@@ -143,5 +138,43 @@ fun CategoryDetailScreen(
         }
     }
 }
+
+@Composable
+private fun RecordItem(
+    record: BookkeepingRecord,
+    modifier: Modifier = Modifier
+) {
+    Row(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(vertical = 8.dp),
+        horizontalArrangement = Arrangement.SpaceBetween,
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Column(
+            modifier = Modifier.weight(1f)
+        ) {
+            Text(
+                text = record.memberId.toString(),  // 暂时显示 memberId，后续可以通过 MemberDao 获取成员名称
+                style = MaterialTheme.typography.titleMedium
+            )
+            if (record.description.isNotBlank()) {
+                Text(
+                    text = record.description,
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+            Text(
+                text = SimpleDateFormat("HH:mm", Locale.getDefault()).format(record.date),
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+        }
+        Text(
+            text = NumberFormat.getCurrencyInstance(Locale.CHINA).format(record.amount),
+            style = MaterialTheme.typography.titleMedium,
+            color = MaterialTheme.colorScheme.error
+        )
     }
 }

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

@@ -2,7 +2,6 @@ package com.yovinchen.bookkeeping.ui.screen
 
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.items
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material3.*
@@ -12,7 +11,8 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
-import com.yovinchen.bookkeeping.model.BookkeepingRecord
+import com.yovinchen.bookkeeping.data.Record
+import com.yovinchen.bookkeeping.ui.components.RecordItem
 import com.yovinchen.bookkeeping.viewmodel.MemberDetailViewModel
 import java.text.NumberFormat
 import java.text.SimpleDateFormat
@@ -24,6 +24,7 @@ import java.util.*
 @Composable
 fun MemberDetailScreen(
     memberName: String,
+    category: String,
     yearMonth: YearMonth,
     onNavigateBack: () -> Unit,
     viewModel: MemberDetailViewModel = viewModel()
@@ -31,8 +32,8 @@ fun MemberDetailScreen(
     val records by viewModel.memberRecords.collectAsState(initial = emptyList())
     val totalAmount by viewModel.totalAmount.collectAsState(initial = 0.0)
     
-    LaunchedEffect(memberName, yearMonth) {
-        viewModel.loadMemberRecords(memberName, yearMonth)
+    LaunchedEffect(memberName, category, yearMonth) {
+        viewModel.loadMemberRecords(memberName, category, yearMonth)
     }
 
     val groupedRecords = remember(records) {
@@ -45,7 +46,7 @@ fun MemberDetailScreen(
         topBar = {
             TopAppBar(
                 title = { 
-                    Text("$memberName - ${yearMonth.format(DateTimeFormatter.ofPattern("yyyy年MM月"))}") 
+                    Text("$category - $memberName") 
                 },
                 navigationIcon = {
                     IconButton(onClick = onNavigateBack) {
@@ -55,25 +56,29 @@ fun MemberDetailScreen(
             )
         }
     ) { padding ->
-        Column(
+        LazyColumn(
             modifier = Modifier
                 .fillMaxSize()
                 .padding(padding)
         ) {
-            // 总金额显示
+            // 第一层：总金额卡片
+            item {
                 Card(
                     modifier = Modifier
                         .fillMaxWidth()
-                    .padding(16.dp)
+                        .padding(16.dp),
+                    elevation = CardDefaults.cardElevation(defaultElevation = 4.dp)
                 ) {
                     Column(
                         modifier = Modifier
-                        .padding(16.dp)
+                            .padding(16.dp),
+                        horizontalAlignment = Alignment.CenterHorizontally
                     ) {
                         Text(
-                        text = "总支出",
+                            text = "当前分类总支出",
                             style = MaterialTheme.typography.titleMedium
                         )
+                        Spacer(modifier = Modifier.height(8.dp))
                         Text(
                             text = NumberFormat.getCurrencyInstance(Locale.CHINA)
                                 .format(totalAmount),
@@ -82,22 +87,38 @@ fun MemberDetailScreen(
                         )
                     }
                 }
+            }
 
-            // 按日期分组的记录列表
-            LazyColumn(
-                modifier = Modifier.fillMaxSize(),
-                contentPadding = PaddingValues(horizontal = 16.dp, vertical = 8.dp),
-                verticalArrangement = Arrangement.spacedBy(8.dp)
-            ) {
+            // 第二层：按日期分组的记录列表
             groupedRecords.forEach { (date, dayRecords) ->
                 item {
+                    Card(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .padding(horizontal = 16.dp, vertical = 8.dp),
+                        elevation = CardDefaults.cardElevation(defaultElevation = 2.dp)
+                    ) {
+                        Column(
+                            modifier = Modifier.padding(16.dp)
+                        ) {
+                            Row(
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .padding(bottom = 8.dp),
+                                horizontalArrangement = Arrangement.SpaceBetween
+                            ) {
                                 Text(
                                     text = date,
+                                    style = MaterialTheme.typography.titleMedium
+                                )
+                                Text(
+                                    text = NumberFormat.getCurrencyInstance(Locale.CHINA)
+                                        .format(dayRecords.sumOf { it.amount }),
                                     style = MaterialTheme.typography.titleMedium,
-                            modifier = Modifier.padding(vertical = 8.dp)
+                                    color = MaterialTheme.colorScheme.primary
                                 )
                             }
-                    items(dayRecords.sortedByDescending { it.date }) { record ->
+                            dayRecords.forEach { record ->
                                 RecordItem(record = record)
                             }
                         }
@@ -105,45 +126,37 @@ fun MemberDetailScreen(
                 }
             }
         }
+    }
+}
 
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
-private fun RecordItem(record: BookkeepingRecord) {
-    Card(
-        modifier = Modifier.fillMaxWidth()
-    ) {
+private fun RecordItem(record: Record) {
     Row(
         modifier = Modifier
             .fillMaxWidth()
-                .padding(16.dp),
+            .padding(vertical = 4.dp),
         horizontalArrangement = Arrangement.SpaceBetween,
         verticalAlignment = Alignment.CenterVertically
     ) {
-            Column(
-                modifier = Modifier.weight(1f)
-            ) {
-                Text(
-                    text = record.category,
-                    style = MaterialTheme.typography.titleMedium
-                )
+        Column {
             if (record.description.isNotBlank()) {
                 Text(
                     text = record.description,
-                        style = MaterialTheme.typography.bodyMedium,
-                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    style = MaterialTheme.typography.bodyMedium
                 )
             }
             Text(
-                    text = SimpleDateFormat("HH:mm", Locale.getDefault()).format(record.date),
+                text = SimpleDateFormat("HH:mm", Locale.getDefault())
+                    .format(record.dateTime),
                 style = MaterialTheme.typography.bodySmall,
                 color = MaterialTheme.colorScheme.onSurfaceVariant
             )
         }
         Text(
-                text = NumberFormat.getCurrencyInstance(Locale.CHINA).format(record.amount),
-                style = MaterialTheme.typography.titleMedium,
-                color = if (record.amount < 0) MaterialTheme.colorScheme.error else MaterialTheme.colorScheme.primary
+            text = NumberFormat.getCurrencyInstance(Locale.CHINA)
+                .format(record.amount),
+            style = MaterialTheme.typography.bodyMedium,
+            color = MaterialTheme.colorScheme.primary
         )
     }
 }
-}

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

@@ -1,14 +1,12 @@
 package com.yovinchen.bookkeeping.viewmodel
 
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
 import com.yovinchen.bookkeeping.data.BookkeepingDatabase
 import com.yovinchen.bookkeeping.model.BookkeepingRecord
-import com.yovinchen.bookkeeping.model.Member
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.first
-import kotlinx.coroutines.launch
+import com.yovinchen.bookkeeping.model.CategoryStat
+import kotlinx.coroutines.flow.*
 import java.time.YearMonth
 import java.time.format.DateTimeFormatter
 
@@ -17,36 +15,40 @@ class CategoryDetailViewModel(
     private val category: String,
     private val month: YearMonth
 ) : ViewModel() {
+    private val recordDao = database.bookkeepingDao()
+    private val yearMonthStr = month.format(DateTimeFormatter.ofPattern("yyyy-MM"))
+
     private val _records = MutableStateFlow<List<BookkeepingRecord>>(emptyList())
-    val records: StateFlow<List<BookkeepingRecord>> = _records
+    val records: StateFlow<List<BookkeepingRecord>> = _records.asStateFlow()
 
-    private val _total = MutableStateFlow(0.0)
-    val total: StateFlow<Double> = _total
+    private val _memberStats = MutableStateFlow<List<CategoryStat>>(emptyList())
+    val memberStats: StateFlow<List<CategoryStat>> = _memberStats.asStateFlow()
 
-    private val _members = MutableStateFlow<List<Member>>(emptyList())
-    val members: StateFlow<List<Member>> = _members
+    val total: StateFlow<Double> = records
+        .map { records -> records.sumOf { it.amount } }
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5000),
+            initialValue = 0.0
+        )
 
     init {
-        loadRecords()
-        loadMembers()
+        recordDao.getRecordsByCategory(category)
+            .onEach { records ->
+                _records.value = records.filter { record ->
+                    val recordMonth = YearMonth.from(
+                        DateTimeFormatter.ofPattern("yyyy-MM")
+                            .parse(yearMonthStr)
+                    )
+                    YearMonth.from(record.date.toInstant().atZone(java.time.ZoneId.systemDefault()).toLocalDateTime()) == recordMonth
                 }
+            }
+            .launchIn(viewModelScope)
 
-    private fun loadRecords() {
-        viewModelScope.launch {
-            val monthStr = month.format(DateTimeFormatter.ofPattern("yyyy-MM"))
-            database.bookkeepingDao().getRecordsByCategoryAndMonth(category, monthStr)
-                .collect { records ->
-                    _records.value = records
-                    _total.value = records.sumOf { it.amount }
-                }
-        }
-    }
-
-    private fun loadMembers() {
-        viewModelScope.launch {
-            database.memberDao().getAllMembers().collect { members ->
-                _members.value = members
-            }
-        }
+        recordDao.getMemberStatsByCategory(category, yearMonthStr)
+            .onEach { stats ->
+                _memberStats.value = stats
+            }
+            .launchIn(viewModelScope)
     }
 }

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

@@ -5,30 +5,43 @@ import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.yovinchen.bookkeeping.data.BookkeepingDatabase
 import com.yovinchen.bookkeeping.model.BookkeepingRecord
-import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
 import java.time.YearMonth
-import java.time.format.DateTimeFormatter
+import java.time.ZoneId
+import java.util.Date
 
 class MemberDetailViewModel(application: Application) : AndroidViewModel(application) {
-    private val recordDao = BookkeepingDatabase.getDatabase(application).bookkeepingDao()
+    private val database = BookkeepingDatabase.getDatabase(application)
+    private val recordDao = database.bookkeepingDao()
 
     private val _memberRecords = MutableStateFlow<List<BookkeepingRecord>>(emptyList())
-    val memberRecords: StateFlow<List<BookkeepingRecord>> = _memberRecords.asStateFlow()
+    val memberRecords: StateFlow<List<BookkeepingRecord>> = _memberRecords
 
-    val totalAmount: StateFlow<Double> = _memberRecords
-        .map { records -> records.sumOf { it.amount } }
-        .stateIn(
-            scope = viewModelScope,
-            started = SharingStarted.WhileSubscribed(5000),
-            initialValue = 0.0
+    private val _totalAmount = MutableStateFlow(0.0)
+    val totalAmount: StateFlow<Double> = _totalAmount
+
+    fun loadMemberRecords(memberName: String, category: String, yearMonth: YearMonth) {
+        viewModelScope.launch {
+            val startDate = yearMonth.atDay(1).atStartOfDay()
+                .atZone(ZoneId.systemDefault())
+                .toInstant()
+                .let { Date.from(it) }
+
+            val endDate = yearMonth.atEndOfMonth().atTime(23, 59, 59)
+                .atZone(ZoneId.systemDefault())
+                .toInstant()
+                .let { Date.from(it) }
+
+            val records = recordDao.getRecordsByMemberAndCategory(
+                memberName = memberName,
+                category = category,
+                startDate = startDate,
+                endDate = endDate
             )
-
-    fun loadMemberRecords(memberName: String, yearMonth: YearMonth) {
-        recordDao.getRecordsByMemberAndMonth(
-            memberName,
-            yearMonth.format(DateTimeFormatter.ofPattern("yyyy-MM"))
-        ).onEach { records ->
             _memberRecords.value = records
-        }.launchIn(viewModelScope)
+            _totalAmount.value = records.sumOf { it.amount }
+        }
     }
 }