feat: 添加时间区间选择和数据统计改进

1. 添加 DateRangePicker 组件用于时间区间选择
2. 新增 MemberStat 模型用于成员统计
3. 重构 CategoryStatItem 以支持多类型统计数据
4. 更新 AnalysisViewModel 以支持时间区间统计
5. 改进分类和成员视图的切换逻辑

app/src/main/java/com/yovinchen/bookkeeping/model/MemberStat.kt

@@ -0,0 +1,8 @@
+package com.yovinchen.bookkeeping.model
+
+data class MemberStat(
+    val member: String,
+    val amount: Double,
+    val count: Int,
+    val percentage: Double = 0.0
+)

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

@@ -1,71 +1,76 @@
 package com.yovinchen.bookkeeping.ui.components
 
-import android.annotation.SuppressLint
-import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.material3.LinearProgressIndicator
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
 import com.yovinchen.bookkeeping.model.CategoryStat
+import com.yovinchen.bookkeeping.model.MemberStat
+import java.text.NumberFormat
+import java.util.*
 
-@SuppressLint("DefaultLocale")
 @Composable
 fun CategoryStatItem(
-    stat: CategoryStat,
-    onClick: () -> Unit
+    stat: Any,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier
 ) {
-    Column(
-        modifier = Modifier
-            .fillMaxWidth()
-            .clickable(onClick = onClick)
-            .padding(vertical = 8.dp)
-    ) {
-        Row(
-            modifier = Modifier.fillMaxWidth(),
-            horizontalArrangement = Arrangement.SpaceBetween,
-            verticalAlignment = Alignment.CenterVertically
-        ) {
-            Text(
-                text = stat.category,
-                style = MaterialTheme.typography.bodyLarge
-            )
-            Text(
-                text = String.format("%.2f", stat.amount),
-                style = MaterialTheme.typography.bodyLarge
-            )
+    val name = when (stat) {
+        is CategoryStat -> stat.category
+        is MemberStat -> stat.member
+        else -> return
     }
     
-        Spacer(modifier = Modifier.height(4.dp))
+    val amount = when (stat) {
+        is CategoryStat -> stat.amount
+        is MemberStat -> stat.amount
+        else -> return
+    }
     
+    val count = when (stat) {
+        is CategoryStat -> stat.count
+        is MemberStat -> stat.count
+        else -> return
+    }
+    
+    val percentage = when (stat) {
+        is CategoryStat -> stat.percentage
+        is MemberStat -> stat.percentage
+        else -> return
+    }
+
+    Card(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp, vertical = 4.dp)
+            .clickable(onClick = onClick),
+        elevation = CardDefaults.cardElevation(defaultElevation = 2.dp)
+    ) {
         Row(
-            modifier = Modifier.fillMaxWidth(),
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(16.dp),
             horizontalArrangement = Arrangement.SpaceBetween,
             verticalAlignment = Alignment.CenterVertically
         ) {
-            LinearProgressIndicator(
-                progress = { stat.percentage.toFloat() / 100f },
-                modifier = Modifier
-                    .weight(1f)
-                    .height(8.dp)
-                    .background(
-                        MaterialTheme.colorScheme.surfaceVariant,
-                        RoundedCornerShape(4.dp)
-                    ),
-            )
-            
-            Spacer(modifier = Modifier.width(8.dp))
-            
+            Column(modifier = Modifier.weight(1f)) {
                 Text(
-                text = String.format("%.1f%%", stat.percentage),
-                style = MaterialTheme.typography.bodyMedium,
+                    text = name,
+                    style = MaterialTheme.typography.bodyLarge
+                )
+                Text(
+                    text = "${count}笔 · ${String.format("%.1f%%", percentage)}",
+                    style = MaterialTheme.typography.bodySmall,
                     color = MaterialTheme.colorScheme.onSurfaceVariant
                 )
             }
+            Text(
+                text = NumberFormat.getCurrencyInstance(Locale.CHINA).format(amount),
+                style = MaterialTheme.typography.titleMedium
+            )
+        }
     }
 }

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

@@ -0,0 +1,62 @@
+package com.yovinchen.bookkeeping.ui.components
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import java.time.YearMonth
+import java.time.format.DateTimeFormatter
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun DateRangePicker(
+    startMonth: YearMonth,
+    endMonth: YearMonth,
+    onStartMonthSelected: (YearMonth) -> Unit,
+    onEndMonthSelected: (YearMonth) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    var showStartMonthPicker by remember { mutableStateOf(false) }
+    var showEndMonthPicker by remember { mutableStateOf(false) }
+    val formatter = DateTimeFormatter.ofPattern("yyyy年MM月")
+
+    Row(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp, vertical = 8.dp),
+        horizontalArrangement = Arrangement.SpaceBetween,
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Button(onClick = { showStartMonthPicker = true }) {
+            Text(startMonth.format(formatter))
+        }
+        Text("至")
+        Button(onClick = { showEndMonthPicker = true }) {
+            Text(endMonth.format(formatter))
+        }
+    }
+
+    if (showStartMonthPicker) {
+        MonthYearPicker(
+            selectedMonth = startMonth,
+            onMonthSelected = {
+                onStartMonthSelected(it)
+                showStartMonthPicker = false
+            },
+            onDismiss = { showStartMonthPicker = false }
+        )
+    }
+
+    if (showEndMonthPicker) {
+        MonthYearPicker(
+            selectedMonth = endMonth,
+            onMonthSelected = {
+                onEndMonthSelected(it)
+                showEndMonthPicker = false
+            },
+            onDismiss = { showEndMonthPicker = false }
+        )
+    }
+}

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

@@ -33,12 +33,13 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.yovinchen.bookkeeping.model.AnalysisType
+import com.yovinchen.bookkeeping.model.CategoryStat
+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.MonthYearPicker
+import com.yovinchen.bookkeeping.ui.components.DateRangePicker
 import com.yovinchen.bookkeeping.viewmodel.AnalysisViewModel
 import java.time.YearMonth
-import java.time.format.DateTimeFormatter
 
 enum class ViewMode {
     CATEGORY, MEMBER
@@ -51,12 +52,12 @@ fun AnalysisScreen(
     onNavigateToMemberDetail: (String, YearMonth, AnalysisType) -> Unit
 ) {
     val viewModel: AnalysisViewModel = viewModel()
-    val selectedMonth by viewModel.selectedMonth.collectAsState()
+    val startMonth by viewModel.startMonth.collectAsState()
+    val endMonth by viewModel.endMonth.collectAsState()
     val selectedAnalysisType by viewModel.selectedAnalysisType.collectAsState()
     val categoryStats by viewModel.categoryStats.collectAsState()
     val memberStats by viewModel.memberStats.collectAsState()
 
-    var showMonthPicker by remember { mutableStateOf(false) }
     var showViewModeMenu by remember { mutableStateOf(false) }
     var currentViewMode by rememberSaveable { mutableStateOf(ViewMode.CATEGORY) }
 
@@ -66,18 +67,13 @@ fun AnalysisScreen(
                 .fillMaxSize()
                 .padding(padding)
         ) {
-            // 时间选择按钮行
-            Row(
-                modifier = Modifier
-                    .fillMaxWidth()
-                    .padding(horizontal = 16.dp, vertical = 8.dp),
-                horizontalArrangement = Arrangement.End,
-                verticalAlignment = Alignment.CenterVertically
-            ) {
-                Button(onClick = { showMonthPicker = true }) {
-                    Text(selectedMonth.format(DateTimeFormatter.ofPattern("yyyy年MM月")))
-                }
-            }
+            // 时间区间选择
+            DateRangePicker(
+                startMonth = startMonth,
+                endMonth = endMonth,
+                onStartMonthSelected = viewModel::setStartMonth,
+                onEndMonthSelected = viewModel::setEndMonth
+            )
 
             // 分析类型和视图模式选择行
             Row(
@@ -147,7 +143,7 @@ fun AnalysisScreen(
                     item {
                         CategoryPieChart(
                             categoryData = categoryStats.map { Pair(it.category, it.percentage.toFloat()) },
-                            memberData = memberStats.map { Pair(it.category, it.percentage.toFloat()) },
+                            memberData = memberStats.map { Pair(it.member, it.percentage.toFloat()) },
                             currentViewMode = currentViewMode == ViewMode.MEMBER,
                             modifier = Modifier
                                 .fillMaxWidth()
@@ -155,9 +151,9 @@ fun AnalysisScreen(
                                 .padding(bottom = 16.dp),
                             onCategoryClick = { category ->
                                 if (currentViewMode == ViewMode.CATEGORY) {
-                                    onNavigateToCategoryDetail(category, selectedMonth)
+                                    onNavigateToCategoryDetail(category, startMonth)
                                 } else {
-                                    onNavigateToMemberDetail(category, selectedMonth, selectedAnalysisType)
+                                    onNavigateToMemberDetail(category, startMonth, selectedAnalysisType)
                                 }
                             }
                         )
@@ -166,29 +162,21 @@ fun AnalysisScreen(
 
                 // 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) {
-                                onNavigateToCategoryDetail(stat.category, selectedMonth)
-                            } else {
-                                onNavigateToMemberDetail(stat.category, selectedMonth, selectedAnalysisType)
+                            if (currentViewMode == ViewMode.CATEGORY && category != null) {
+                                onNavigateToCategoryDetail(category, startMonth)
+                            } else if (currentViewMode == ViewMode.MEMBER && member != null) {
+                                onNavigateToMemberDetail(member, startMonth, selectedAnalysisType)
                             }
                         }
                     )
                 }
             }
-
-            if (showMonthPicker) {
-                MonthYearPicker(
-                    selectedMonth = selectedMonth,
-                    onMonthSelected = { month ->
-                        viewModel.setSelectedMonth(month)
-                        showMonthPicker = false
-                    },
-                    onDismiss = { showMonthPicker = false }
-                )
-            }
         }
     }
 }

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

@@ -6,67 +6,65 @@ import androidx.lifecycle.viewModelScope
 import com.yovinchen.bookkeeping.data.BookkeepingDatabase
 import com.yovinchen.bookkeeping.model.AnalysisType
 import com.yovinchen.bookkeeping.model.CategoryStat
+import com.yovinchen.bookkeeping.model.MemberStat
 import com.yovinchen.bookkeeping.model.TransactionType
 import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.launch
 import java.time.LocalDateTime
 import java.time.YearMonth
 import java.time.ZoneId
-import java.util.Date
+import java.util.*
 
 class AnalysisViewModel(application: Application) : AndroidViewModel(application) {
     private val recordDao = BookkeepingDatabase.getDatabase(application).bookkeepingDao()
     private val memberDao = BookkeepingDatabase.getDatabase(application).memberDao()
 
-    private val _selectedMonth = MutableStateFlow(YearMonth.now())
-    val selectedMonth = _selectedMonth.asStateFlow()
+    private val _startMonth = MutableStateFlow(YearMonth.now())
+    val startMonth: StateFlow<YearMonth> = _startMonth.asStateFlow()
+
+    private val _endMonth = MutableStateFlow(YearMonth.now())
+    val endMonth: StateFlow<YearMonth> = _endMonth.asStateFlow()
 
     private val _selectedAnalysisType = MutableStateFlow(AnalysisType.EXPENSE)
-    val selectedAnalysisType = _selectedAnalysisType.asStateFlow()
+    val selectedAnalysisType: StateFlow<AnalysisType> = _selectedAnalysisType.asStateFlow()
 
-    private val members = memberDao.getAllMembers()
+    private val _categoryStats = MutableStateFlow<List<CategoryStat>>(emptyList())
+    val categoryStats: StateFlow<List<CategoryStat>> = _categoryStats.asStateFlow()
 
-    val memberStats = combine(selectedMonth, selectedAnalysisType, members) { month, type, membersList ->
+    private val _memberStats = MutableStateFlow<List<MemberStat>>(emptyList())
+    val memberStats: StateFlow<List<MemberStat>> = _memberStats.asStateFlow()
+
+    init {
+        viewModelScope.launch {
+            combine(startMonth, endMonth, selectedAnalysisType) { start, end, type ->
+                Triple(start, end, type)
+            }.collect { (start, end, type) ->
+                updateStats(start, end, type)
+            }
+        }
+    }
+
+    fun setStartMonth(month: YearMonth) {
+        _startMonth.value = month
+    }
+
+    fun setEndMonth(month: YearMonth) {
+        _endMonth.value = month
+    }
+
+    fun setAnalysisType(type: AnalysisType) {
+        _selectedAnalysisType.value = type
+    }
+
+    private suspend fun updateStats(startMonth: YearMonth, endMonth: YearMonth, type: AnalysisType) {
         val records = recordDao.getAllRecords().first()
         val monthRecords = records.filter {
             val recordDate = Date(it.date.time)
             val localDateTime = LocalDateTime.ofInstant(recordDate.toInstant(), ZoneId.systemDefault())
-            YearMonth.from(localDateTime) == month && it.type == when(type) {
-                AnalysisType.EXPENSE -> TransactionType.EXPENSE
-                AnalysisType.INCOME -> TransactionType.INCOME
-                else -> null
-            }
-        }
-
-        // 按成员统计
-        val memberMap = monthRecords.groupBy { record ->
-            membersList.find { it.id == record.memberId }?.name ?: "未分配"
-        }
-        
-        val stats = memberMap.map { (memberName, records) ->
-            CategoryStat(
-                category = memberName,
-                amount = records.sumOf { it.amount },
-                count = records.size
-            )
-        }.sortedByDescending { it.amount }
-
-        // 计算总额
-        val total = stats.sumOf { it.amount }
-        
-        // 计算百分比
-        stats.map { it.copy(percentage = if (total > 0) it.amount / total * 100 else 0.0) }
-    }.stateIn(
-        scope = viewModelScope,
-        started = SharingStarted.WhileSubscribed(5000),
-        initialValue = emptyList()
-    )
-
-    val categoryStats = combine(selectedMonth, selectedAnalysisType) { month, type ->
-        val records = recordDao.getAllRecords().first()
-        val monthRecords = records.filter {
-            val recordDate = Date(it.date.time)
-            val localDateTime = LocalDateTime.ofInstant(recordDate.toInstant(), ZoneId.systemDefault())
-            YearMonth.from(localDateTime) == month && it.type == when(type) {
+            val yearMonth = YearMonth.from(localDateTime)
+            yearMonth.isAfter(startMonth.minusMonths(1)) && 
+            yearMonth.isBefore(endMonth.plusMonths(1)) && 
+            it.type == when(type) {
                 AnalysisType.EXPENSE -> TransactionType.EXPENSE
                 AnalysisType.INCOME -> TransactionType.INCOME
                 else -> null
@@ -75,7 +73,7 @@ class AnalysisViewModel(application: Application) : AndroidViewModel(application
 
         // 按分类统计
         val categoryMap = monthRecords.groupBy { it.category }
-        val stats = categoryMap.map { (category, records) ->
+        val categoryStats = categoryMap.map { (category, records) ->
             CategoryStat(
                 category = category,
                 amount = records.sumOf { it.amount },
@@ -83,22 +81,33 @@ class AnalysisViewModel(application: Application) : AndroidViewModel(application
             )
         }.sortedByDescending { it.amount }
 
-        // 计算总额
-        val total = stats.sumOf { it.amount }
+        // 计算分类总额和百分比
+        val categoryTotal = categoryStats.sumOf { it.amount }
+        val categoryStatsWithPercentage = categoryStats.map { 
+            it.copy(percentage = if (categoryTotal > 0) it.amount / categoryTotal * 100 else 0.0) 
+        }
 
-        // 计算百分比
-        stats.map { it.copy(percentage = if (total > 0) it.amount / total * 100 else 0.0) }
-    }.stateIn(
-        scope = viewModelScope,
-        started = SharingStarted.WhileSubscribed(5000),
-        initialValue = emptyList()
+        // 按成员统计
+        val members = memberDao.getAllMembers().first()
+        val memberMap = monthRecords.groupBy { record ->
+            members.find { it.id == record.memberId }?.name ?: "未分配"
+        }
+        
+        val memberStats = memberMap.map { (memberName, records) ->
+            MemberStat(
+                member = memberName,
+                amount = records.sumOf { it.amount },
+                count = records.size
             )
+        }.sortedByDescending { it.amount }
 
-    fun setSelectedMonth(month: YearMonth) {
-        _selectedMonth.value = month
+        // 计算成员总额和百分比
+        val memberTotal = memberStats.sumOf { it.amount }
+        val memberStatsWithPercentage = memberStats.map { 
+            it.copy(percentage = if (memberTotal > 0) it.amount / memberTotal * 100 else 0.0) 
         }
 
-    fun setAnalysisType(type: AnalysisType) {
-        _selectedAnalysisType.value = type
+        _categoryStats.value = categoryStatsWithPercentage
+        _memberStats.value = memberStatsWithPercentage
     }
 }