feat: 实现月度记账开始日期功能

- 添加 Settings 实体和 DAO 来持久化存储设置
- 创建 SettingsRepository 管理设置数据
- 添加数据库迁移从版本 4 到版本 5
- 在设置界面添加月度开始日期选择器（1-28号）
- 创建 DateUtils 工具类处理基于月度开始日期的日期计算
- 更新 HomeViewModel 和 AnalysisViewModel 使用月度开始日期进行统计
- 修复日期选择器中数字显示不完整的问题

README.md

@@ -32,6 +32,7 @@
 - [x] Material 3 设计界面
 - [x] 深色/浅色主题切换
 - [x] 主题色自定义
+- [ ] 月度记账开始日期
 
 ### 1. 成员系统 (已完成 🎉)
 - [x] 成员添加/编辑/删除

app/build.gradle.kts

@@ -17,7 +17,7 @@ android {
         minSdk = 26
         targetSdk = 34
         versionCode = 6
-        versionName = "1.4.0"
+        versionName = "1.3.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables {

app/src/main/java/com/yovinchen/bookkeeping/MainActivity.kt

@@ -24,40 +24,66 @@ import com.yovinchen.bookkeeping.ui.navigation.MainNavigation
 import com.yovinchen.bookkeeping.ui.theme.BookkeepingTheme
 import com.yovinchen.bookkeeping.utils.FilePickerUtil
 
+/**
+ * 全局文件选择器启动器
+ * 用于在整个应用程序中共享同一个文件选择器实例
+ */
 private var filePickerLauncher: ActivityResultLauncher<Array<String>>? = null
 
+/**
+ * 获取预先注册的文件选择器启动器的扩展函数
+ * 
+ * @return 预先注册的文件选择器启动器
+ * @throws IllegalStateException 如果文件选择器未初始化
+ */
 fun ComponentActivity.getPreregisteredFilePickerLauncher(): ActivityResultLauncher<Array<String>> {
     return filePickerLauncher ?: throw IllegalStateException("FilePickerLauncher not initialized")
 }
 
+/**
+ * 应用程序的主活动
+ * 负责初始化应用界面和必要的系统组件
+ */
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        // 设置系统窗口装饰，确保内容能够扩展到系统栏区域
         WindowCompat.setDecorFitsSystemWindows(window, false)
 
-        // 预注册文件选择器
+        // 预注册文件选择器，用于处理文件选择操作
         filePickerLauncher = registerForActivityResult(
             ActivityResultContracts.OpenDocument()
         ) { uri: Uri? ->
+            // 当用户选择文件后，调用工具类处理文件选择结果
             FilePickerUtil.handleFileSelection(this, uri)
         }
 
+        // 设置应用的主Compose内容
         setContent {
             BookkeepingApp()
         }
     }
 }
 
+/**
+ * 系统状态栏和导航栏颜色设置
+ * 根据当前主题模式设置系统UI元素的颜色和外观
+ * 
+ * @param isDarkTheme 是否为暗色主题
+ */
 @Composable
 private fun SystemBarColor(isDarkTheme: Boolean) {
     val view = LocalView.current
     if (!view.isInEditMode) {
+        // 获取当前主题的表面颜色用于系统栏
         val surfaceColor = MaterialTheme.colorScheme.surface.toArgb()
         val currentWindow = (view.context as? Activity)?.window
         SideEffect {
             currentWindow?.let { window ->
+                // 设置状态栏和导航栏颜色
                 window.statusBarColor = surfaceColor
                 window.navigationBarColor = surfaceColor
+                // 设置系统栏图标的亮暗模式，以确保在不同背景下的可见性
                 WindowCompat.getInsetsController(window, view).apply {
                     isAppearanceLightStatusBars = !isDarkTheme
                     isAppearanceLightNavigationBars = !isDarkTheme
@@ -67,27 +93,37 @@ private fun SystemBarColor(isDarkTheme: Boolean) {
     }
 }
 
+/**
+ * 记账应用的主Compose函数
+ * 处理主题设置并启动主导航组件
+ */
 @Composable
 fun BookkeepingApp() {
+    // 跟踪当前应用的主题模式状态
     var themeMode by remember { mutableStateOf<ThemeMode>(ThemeMode.FOLLOW_SYSTEM) }
     
+    // 根据主题模式确定是否使用暗色主题
     val isDarkTheme = when (themeMode) {
-        is ThemeMode.FOLLOW_SYSTEM -> isSystemInDarkTheme()
-        is ThemeMode.LIGHT -> false
-        is ThemeMode.DARK -> true
-        is ThemeMode.CUSTOM -> isSystemInDarkTheme()
+        is ThemeMode.FOLLOW_SYSTEM -> isSystemInDarkTheme()  // 跟随系统设置
+        is ThemeMode.LIGHT -> false                          // 强制使用亮色主题
+        is ThemeMode.DARK -> true                            // 强制使用暗色主题
+        is ThemeMode.CUSTOM -> isSystemInDarkTheme()         // 自定义主题下的基础亮暗模式仍跟随系统
     }
 
+    // 处理自定义主题颜色方案
     val customColorScheme = when (themeMode) {
         is ThemeMode.CUSTOM -> {
+            // 从主题模式中提取自定义主色
             val primaryColor = (themeMode as ThemeMode.CUSTOM).primaryColor
             if (isDarkTheme) {
+                // 暗色模式下的自定义颜色方案
                 MaterialTheme.colorScheme.copy(
                     primary = primaryColor,
                     secondary = primaryColor.copy(alpha = 0.7f),
                     tertiary = primaryColor.copy(alpha = 0.5f)
                 )
             } else {
+                // 亮色模式下的自定义颜色方案
                 MaterialTheme.colorScheme.copy(
                     primary = primaryColor,
                     secondary = primaryColor.copy(alpha = 0.7f),
@@ -95,27 +131,38 @@ fun BookkeepingApp() {
                 )
             }
         }
-        else -> null
+        else -> null  // 非自定义主题模式使用默认颜色方案
     }
 
+    // 应用主题到整个应用内容
     BookkeepingTheme(
         darkTheme = isDarkTheme,
         customColorScheme = customColorScheme
     ) {
+        // 设置系统状态栏和导航栏颜色
         SystemBarColor(isDarkTheme)
         
+        // 创建填充整个屏幕的基础Surface
         Surface(
             modifier = Modifier.fillMaxSize(),
             color = MaterialTheme.colorScheme.surface
         ) {
+            // 启动主导航组件，并传递主题相关参数
             MainNavigation(
                 currentTheme = themeMode,
-                onThemeChange = { themeMode = it }
+                onThemeChange = { themeMode = it }  // 允许导航组件中的屏幕更改主题
             )
         }
     }
 }
 
+/**
+ * 示例问候函数
+ * 仅用于开发预览和测试目的
+ * 
+ * @param name 要显示的名称
+ * @param modifier 应用于Text组件的修饰符
+ */
 @Composable
 fun Greeting(name: String, modifier: Modifier = Modifier) {
     Text(
@@ -124,6 +171,9 @@ fun Greeting(name: String, modifier: Modifier = Modifier) {
     )
 }
 
+/**
+ * Greeting组件的预览函数
+ */
 @Preview(showBackground = true)
 @Composable
 fun GreetingPreview() {
@@ -132,6 +182,9 @@ fun GreetingPreview() {
     }
 }
 
+/**
+ * 整个应用的预览函数
+ */
 @Preview(showBackground = true)
 @Composable
 fun BookkeepingAppPreview() {

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

@@ -13,14 +13,15 @@ import com.yovinchen.bookkeeping.model.BookkeepingRecord
 import com.yovinchen.bookkeeping.model.Category
 import com.yovinchen.bookkeeping.model.Converters
 import com.yovinchen.bookkeeping.model.Member
+import com.yovinchen.bookkeeping.model.Settings
 import com.yovinchen.bookkeeping.model.TransactionType
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 
 @Database(
-    entities = [BookkeepingRecord::class, Category::class, Member::class],
-    version = 4,
+    entities = [BookkeepingRecord::class, Category::class, Member::class, Settings::class],
+    version = 5,
     exportSchema = false
 )
 @TypeConverters(Converters::class)
@@ -28,6 +29,7 @@ abstract class BookkeepingDatabase : RoomDatabase() {
     abstract fun bookkeepingDao(): BookkeepingDao
     abstract fun categoryDao(): CategoryDao
     abstract fun memberDao(): MemberDao
+    abstract fun settingsDao(): SettingsDao
 
     companion object {
         private const val TAG = "BookkeepingDatabase"
@@ -124,6 +126,28 @@ abstract class BookkeepingDatabase : RoomDatabase() {
             }
         }
 
+        private val MIGRATION_4_5 = object : Migration(4, 5) {
+            override fun migrate(db: SupportSQLiteDatabase) {
+                // 创建设置表
+                db.execSQL("""
+                    CREATE TABLE IF NOT EXISTS settings (
+                        id INTEGER PRIMARY KEY NOT NULL DEFAULT 1,
+                        monthStartDay INTEGER NOT NULL DEFAULT 1,
+                        themeMode TEXT NOT NULL DEFAULT 'FOLLOW_SYSTEM',
+                        autoBackupEnabled INTEGER NOT NULL DEFAULT 0,
+                        autoBackupInterval INTEGER NOT NULL DEFAULT 7,
+                        lastBackupTime INTEGER NOT NULL DEFAULT 0
+                    )
+                """)
+                
+                // 插入默认设置
+                db.execSQL("""
+                    INSERT OR IGNORE INTO settings (id, monthStartDay, themeMode, autoBackupEnabled, autoBackupInterval, lastBackupTime)
+                    VALUES (1, 1, 'FOLLOW_SYSTEM', 0, 7, 0)
+                """)
+            }
+        }
+
         @Volatile
         private var INSTANCE: BookkeepingDatabase? = null
 
@@ -134,7 +158,7 @@ abstract class BookkeepingDatabase : RoomDatabase() {
                     BookkeepingDatabase::class.java,
                     "bookkeeping_database"
                 )
-                    .addMigrations(MIGRATION_1_2, MIGRATION_2_3, MIGRATION_3_4)
+                    .addMigrations(MIGRATION_1_2, MIGRATION_2_3, MIGRATION_3_4, MIGRATION_4_5)
                     .addCallback(object : Callback() {
                         override fun onCreate(db: SupportSQLiteDatabase) {
                             super.onCreate(db)
@@ -143,6 +167,11 @@ abstract class BookkeepingDatabase : RoomDatabase() {
                                 try {
                                     val database = getDatabase(context)
                                     
+                                    // 初始化默认设置
+                                    database.settingsDao().apply {
+                                        updateSettings(Settings())
+                                    }
+                                    
                                     // 初始化默认成员
                                     database.memberDao().apply {
                                         if (getMemberCount() == 0) {

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

@@ -0,0 +1,32 @@
+package com.yovinchen.bookkeeping.data
+
+import androidx.room.*
+import com.yovinchen.bookkeeping.model.Settings
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface SettingsDao {
+    @Query("SELECT * FROM settings WHERE id = 1")
+    fun getSettings(): Flow<Settings?>
+    
+    @Query("SELECT * FROM settings WHERE id = 1")
+    suspend fun getSettingsOnce(): Settings?
+    
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun updateSettings(settings: Settings)
+    
+    @Query("UPDATE settings SET monthStartDay = :day WHERE id = 1")
+    suspend fun updateMonthStartDay(day: Int)
+    
+    @Query("UPDATE settings SET themeMode = :mode WHERE id = 1")
+    suspend fun updateThemeMode(mode: String)
+    
+    @Query("UPDATE settings SET autoBackupEnabled = :enabled WHERE id = 1")
+    suspend fun updateAutoBackupEnabled(enabled: Boolean)
+    
+    @Query("UPDATE settings SET autoBackupInterval = :interval WHERE id = 1")
+    suspend fun updateAutoBackupInterval(interval: Int)
+    
+    @Query("UPDATE settings SET lastBackupTime = :time WHERE id = 1")
+    suspend fun updateLastBackupTime(time: Long)
+}

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

@@ -0,0 +1,45 @@
+package com.yovinchen.bookkeeping.data
+
+import com.yovinchen.bookkeeping.model.Settings
+import kotlinx.coroutines.flow.Flow
+
+class SettingsRepository(private val settingsDao: SettingsDao) {
+    
+    fun getSettings(): Flow<Settings?> = settingsDao.getSettings()
+    
+    suspend fun getSettingsOnce(): Settings {
+        return settingsDao.getSettingsOnce() ?: Settings()
+    }
+    
+    suspend fun updateSettings(settings: Settings) {
+        settingsDao.updateSettings(settings)
+    }
+    
+    suspend fun updateMonthStartDay(day: Int) {
+        // 确保日期在有效范围内 (1-28)
+        val validDay = day.coerceIn(1, 28)
+        settingsDao.updateMonthStartDay(validDay)
+    }
+    
+    suspend fun updateThemeMode(mode: String) {
+        settingsDao.updateThemeMode(mode)
+    }
+    
+    suspend fun updateAutoBackupEnabled(enabled: Boolean) {
+        settingsDao.updateAutoBackupEnabled(enabled)
+    }
+    
+    suspend fun updateAutoBackupInterval(interval: Int) {
+        settingsDao.updateAutoBackupInterval(interval)
+    }
+    
+    suspend fun updateLastBackupTime(time: Long) {
+        settingsDao.updateLastBackupTime(time)
+    }
+    
+    suspend fun ensureSettingsExist() {
+        if (settingsDao.getSettingsOnce() == null) {
+            settingsDao.updateSettings(Settings())
+        }
+    }
+}

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

@@ -1,7 +1,13 @@
 package com.yovinchen.bookkeeping.model
 
+/**
+ * 分析类型枚举
+ * 定义记账应用中不同的数据分析视图类型
+ * 
+ * 用于在数据分析模块中区分不同的分析维度和图表类型
+ */
 enum class AnalysisType {
-    EXPENSE,
-    INCOME,
-    TREND
+    EXPENSE,    // 支出分析，用于分析用户的支出情况
+    INCOME,     // 收入分析，用于分析用户的收入情况
+    TREND       // 趋势分析，用于分析用户收支随时间的变化趋势
 }

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

@@ -9,32 +9,71 @@ import androidx.room.TypeConverters
 import com.yovinchen.bookkeeping.model.Member
 import java.util.Date
 
+/**
+ * 交易类型枚举
+ * 定义记账记录的交易类型
+ */
 enum class TransactionType {
-    INCOME, EXPENSE
+    INCOME,   // 收入
+    EXPENSE   // 支出
 }
 
+/**
+ * Room数据库类型转换器
+ * 用于在数据库中存储和检索复杂类型
+ */
 class Converters {
+    /**
+     * 将时间戳转换为Date对象
+     * 
+     * @param value 时间戳（毫秒）
+     * @return 对应的Date对象，如果输入为null则返回null
+     */
     @TypeConverter
     fun fromTimestamp(value: Long?): Date? {
         return value?.let { Date(it) }
     }
 
+    /**
+     * 将Date对象转换为时间戳
+     * 
+     * @param date Date对象
+     * @return 对应的时间戳（毫秒），如果输入为null则返回null
+     */
     @TypeConverter
     fun dateToTimestamp(date: Date?): Long? {
         return date?.time
     }
 
+    /**
+     * 将字符串转换为TransactionType枚举
+     * 
+     * @param value 交易类型的字符串表示
+     * @return 对应的TransactionType枚举值
+     */
     @TypeConverter
     fun fromTransactionType(value: String): TransactionType {
         return enumValueOf<TransactionType>(value)
     }
 
+    /**
+     * 将TransactionType枚举转换为字符串
+     * 
+     * @param type TransactionType枚举值
+     * @return 对应的字符串表示
+     */
     @TypeConverter
     fun transactionTypeToString(type: TransactionType): String {
         return type.name
     }
 }
 
+/**
+ * 记账记录实体类
+ * 用于在Room数据库中存储用户的收支记录
+ * 
+ * 该实体与Member实体存在外键关系，表示每条记录可以关联到一个家庭成员
+ */
 @Entity(
     tableName = "bookkeeping_records",
     foreignKeys = [
@@ -42,21 +81,21 @@ class Converters {
             entity = Member::class,
             parentColumns = ["id"],
             childColumns = ["memberId"],
-            onDelete = ForeignKey.SET_NULL
+            onDelete = ForeignKey.SET_NULL  // 当关联的成员被删除时，将此字段设为NULL
         )
     ],
     indices = [
-        Index(value = ["memberId"])
+        Index(value = ["memberId"])  // 在memberId上创建索引以提高查询性能
     ]
 )
-@TypeConverters(Converters::class)
+@TypeConverters(Converters::class)  // 应用类型转换器
 data class BookkeepingRecord(
     @PrimaryKey(autoGenerate = true)
-    val id: Long = 0,
-    val amount: Double,
-    val type: TransactionType,
-    val category: String,
-    val description: String,
-    val date: Date,
-    val memberId: Int? = null  // 可为空，表示未指定成员
+    val id: Long = 0,               // 记录ID，自动生成
+    val amount: Double,             // 金额
+    val type: TransactionType,      // 交易类型（收入或支出）
+    val category: String,           // 分类
+    val description: String,        // 描述
+    val date: Date,                 // 日期
+    val memberId: Int? = null       // 关联的成员ID，可为空表示未指定成员
 )

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

@@ -3,11 +3,18 @@ package com.yovinchen.bookkeeping.model
 import androidx.room.Entity
 import androidx.room.PrimaryKey
 
+/**
+ * 交易分类实体类
+ * 用于在Room数据库中存储收支分类信息
+ * 
+ * 在记账应用中，每条记账记录都属于某个分类，
+ * 如"餐饮"、"交通"、"工资"等，便于用户对支出和收入进行分类统计
+ */
 @Entity(tableName = "categories")
 data class Category(
     @PrimaryKey(autoGenerate = true)
-    val id: Long = 0,
-    val name: String,
-    val type: TransactionType,
-    val icon: Int? = null
+    val id: Long = 0,               // 分类ID，自动生成
+    val name: String,               // 分类名称
+    val type: TransactionType,      // 分类关联的交易类型（收入或支出）
+    val icon: Int? = null           // 分类图标资源ID，可选，默认为null
 )

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

@@ -1,8 +1,14 @@
 package com.yovinchen.bookkeeping.model
 
+/**
+ * 分类统计数据类
+ * 用于表示某个分类的统计信息，通常用于数据分析和图表展示
+ * 
+ * 该类不是数据库实体，而是从数据库查询结果中聚合生成的统计数据
+ */
 data class CategoryStat(
-    val category: String,
-    val amount: Double,
-    val count: Int = 0,
-    val percentage: Double = 0.0
+    val category: String,           // 分类名称
+    val amount: Double,             // 该分类的总金额
+    val count: Int = 0,             // 该分类下的记录数量
+    val percentage: Double = 0.0    // 该分类金额占总金额的百分比（0.0-100.0）
 )

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

@@ -3,11 +3,18 @@ package com.yovinchen.bookkeeping.model
 import androidx.room.Entity
 import androidx.room.PrimaryKey
 
+/**
+ * 家庭成员实体类
+ * 用于在Room数据库中存储家庭成员信息
+ * 
+ * 在记账应用中，每条记账记录可以关联到特定的家庭成员，
+ * 以便追踪不同成员的收支情况
+ */
 @Entity(tableName = "members")
 data class Member(
     @PrimaryKey(autoGenerate = true)
-    val id: Int = 0,
-    val name: String,
-    val description: String = "",  // 可选的描述信息
-    val icon: Int? = null  // 新增icon字段，可为空
+    val id: Int = 0,                // 成员ID，自动生成
+    val name: String,               // 成员姓名
+    val description: String = "",   // 成员描述信息，可选，默认为空字符串
+    val icon: Int? = null           // 成员图标资源ID，可选，默认为null
 )

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

@@ -2,16 +2,39 @@ package com.yovinchen.bookkeeping.model
 
 import androidx.room.ColumnInfo
 
+/**
+ * 家庭成员统计数据类
+ * 用于表示某个成员的统计信息，通常用于数据分析和图表展示
+ * 
+ * 该类不是数据库实体，而是通过数据库查询直接映射的结果类，
+ * 表示按成员分组的聚合数据
+ */
 data class MemberStat(
+    /**
+     * 成员名称
+     * 映射数据库查询结果中的member列
+     */
     @ColumnInfo(name = "member")
     val member: String,
     
+    /**
+     * 该成员的总金额
+     * 映射数据库查询结果中的amount列
+     */
     @ColumnInfo(name = "amount")
     val amount: Double,
     
+    /**
+     * 该成员下的记录数量
+     * 映射数据库查询结果中的count列
+     */
     @ColumnInfo(name = "count")
     val count: Int,
     
+    /**
+     * 该成员金额占总金额的百分比（0.0-100.0）
+     * 映射数据库查询结果中的percentage列
+     */
     @ColumnInfo(name = "percentage")
     val percentage: Double = 0.0
 )

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

@@ -0,0 +1,14 @@
+package com.yovinchen.bookkeeping.model
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "settings")
+data class Settings(
+    @PrimaryKey val id: Int = 1,
+    val monthStartDay: Int = 1, // 月度开始日期，1-28，默认为1号
+    val themeMode: String = "FOLLOW_SYSTEM", // 主题模式：FOLLOW_SYSTEM, LIGHT, DARK
+    val autoBackupEnabled: Boolean = false, // 自动备份开关
+    val autoBackupInterval: Int = 7, // 自动备份间隔（天）
+    val lastBackupTime: Long = 0L // 上次备份时间
+)

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

@@ -2,9 +2,35 @@ package com.yovinchen.bookkeeping.model
 
 import androidx.compose.ui.graphics.Color
 
+/**
+ * 主题模式密封类
+ * 用于表示应用程序的不同主题设置选项
+ * 通过密封类实现，限制可能的主题模式类型
+ */
 sealed class ThemeMode {
+    /**
+     * 跟随系统主题模式
+     * 应用将根据设备系统的暗色/亮色主题设置自动调整
+     */
     object FOLLOW_SYSTEM : ThemeMode()
+    
+    /**
+     * 固定亮色主题模式
+     * 无论设备系统设置如何，应用将始终使用亮色主题
+     */
     object LIGHT : ThemeMode()
+    
+    /**
+     * 固定暗色主题模式
+     * 无论设备系统设置如何，应用将始终使用暗色主题
+     */
     object DARK : ThemeMode()
+    
+    /**
+     * 自定义主题模式
+     * 允许用户选择自定义的主题颜色
+     * 
+     * @property primaryColor 用户选择的主要颜色，将影响应用的主色调
+     */
     data class CUSTOM(val primaryColor: Color) : ThemeMode()
 }

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

@@ -20,7 +20,6 @@ import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
-import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState

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

@@ -4,13 +4,19 @@ import android.content.Context
 import android.widget.Toast
 import androidx.activity.ComponentActivity
 import androidx.appcompat.app.AppCompatActivity
+import androidx.compose.foundation.BorderStroke
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.foundation.lazy.grid.items
+import androidx.compose.foundation.shape.RoundedCornerShape
 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.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.yovinchen.bookkeeping.model.ThemeMode
@@ -36,7 +42,10 @@ fun SettingsScreen(
     val categories by viewModel.categories.collectAsState()
     val selectedType by viewModel.selectedCategoryType.collectAsState()
     val members by memberViewModel.allMembers.collectAsState(initial = emptyList())
+    val monthStartDay by viewModel.monthStartDay.collectAsState()
     val context = LocalContext.current
+    
+    var showMonthStartDayDialog by remember { mutableStateOf(false) }
 
     Column(modifier = Modifier.fillMaxSize()) {
         // 成员管理设置项
@@ -81,6 +90,15 @@ fun SettingsScreen(
             },
             modifier = Modifier.clickable { showThemeDialog = true }
         )
+        
+        HorizontalDivider()
+        
+        // 月度开始日期设置项
+        ListItem(
+            headlineContent = { Text("月度开始日期") },
+            supportingContent = { Text("每月从${monthStartDay}号开始计算") },
+            modifier = Modifier.clickable { showMonthStartDayDialog = true }
+        )
 
         if (showThemeDialog) {
             AlertDialog(
@@ -144,6 +162,76 @@ fun SettingsScreen(
                 }
             )
         }
+        
+        // 月度开始日期对话框
+        if (showMonthStartDayDialog) {
+            AlertDialog(
+                onDismissRequest = { showMonthStartDayDialog = false },
+                title = { Text("选择月度开始日期") },
+                text = {
+                    Column {
+                        Text("选择每月记账的开始日期（1-28号）")
+                        Spacer(modifier = Modifier.height(16.dp))
+                        
+                        // 日期选择器
+                        val days = (1..28).toList()
+                        LazyVerticalGrid(
+                            columns = GridCells.Fixed(7),
+                            modifier = Modifier.fillMaxWidth().height(280.dp),
+                            contentPadding = PaddingValues(4.dp),
+                            verticalArrangement = Arrangement.spacedBy(4.dp),
+                            horizontalArrangement = Arrangement.spacedBy(4.dp)
+                        ) {
+                            items(days) { day ->
+                                Surface(
+                                    onClick = {
+                                        viewModel.setMonthStartDay(day)
+                                        showMonthStartDayDialog = false
+                                    },
+                                    shape = RoundedCornerShape(8.dp),
+                                    color = if (day == monthStartDay) {
+                                        MaterialTheme.colorScheme.primaryContainer
+                                    } else {
+                                        MaterialTheme.colorScheme.surface
+                                    },
+                                    border = BorderStroke(
+                                        width = 1.dp,
+                                        color = if (day == monthStartDay) {
+                                            MaterialTheme.colorScheme.primary
+                                        } else {
+                                            MaterialTheme.colorScheme.outline
+                                        }
+                                    ),
+                                    modifier = Modifier
+                                        .fillMaxWidth()
+                                        .aspectRatio(1f)
+                                ) {
+                                    Box(
+                                        contentAlignment = Alignment.Center,
+                                        modifier = Modifier.fillMaxSize()
+                                    ) {
+                                        Text(
+                                            text = day.toString(),
+                                            style = MaterialTheme.typography.bodyMedium,
+                                            color = if (day == monthStartDay) {
+                                                MaterialTheme.colorScheme.onPrimaryContainer
+                                            } else {
+                                                MaterialTheme.colorScheme.onSurface
+                                            }
+                                        )
+                                    }
+                                }
+                            }
+                        }
+                    }
+                },
+                confirmButton = {
+                    TextButton(onClick = { showMonthStartDayDialog = false }) {
+                        Text("取消")
+                    }
+                }
+            )
+        }
 
         // 备份对话框
         if (showBackupDialog) {

app/src/main/java/com/yovinchen/bookkeeping/utils/DateUtils.kt

@@ -0,0 +1,85 @@
+package com.yovinchen.bookkeeping.utils
+
+import java.time.LocalDate
+import java.time.YearMonth
+import java.time.ZoneId
+import java.util.Date
+
+object DateUtils {
+    
+    /**
+     * 根据月度开始日期计算给定日期所属的记账月份
+     * @param date 要判断的日期
+     * @param monthStartDay 月度开始日期（1-28）
+     * @return 该日期所属的记账月份
+     */
+    fun getAccountingMonth(date: Date, monthStartDay: Int): YearMonth {
+        val localDate = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate()
+        return getAccountingMonth(localDate, monthStartDay)
+    }
+    
+    /**
+     * 根据月度开始日期计算给定日期所属的记账月份
+     * @param date 要判断的日期
+     * @param monthStartDay 月度开始日期（1-28）
+     * @return 该日期所属的记账月份
+     */
+    fun getAccountingMonth(date: LocalDate, monthStartDay: Int): YearMonth {
+        val dayOfMonth = date.dayOfMonth
+        
+        return if (dayOfMonth >= monthStartDay) {
+            // 当前日期大于等于开始日期，属于当前月
+            YearMonth.from(date)
+        } else {
+            // 当前日期小于开始日期，属于上个月
+            YearMonth.from(date.minusMonths(1))
+        }
+    }
+    
+    /**
+     * 获取记账月份的开始日期
+     * @param yearMonth 记账月份
+     * @param monthStartDay 月度开始日期（1-28）
+     * @return 该记账月份的开始日期
+     */
+    fun getMonthStartDate(yearMonth: YearMonth, monthStartDay: Int): LocalDate {
+        return yearMonth.atDay(monthStartDay)
+    }
+    
+    /**
+     * 获取记账月份的结束日期
+     * @param yearMonth 记账月份
+     * @param monthStartDay 月度开始日期（1-28）
+     * @return 该记账月份的结束日期
+     */
+    fun getMonthEndDate(yearMonth: YearMonth, monthStartDay: Int): LocalDate {
+        val nextMonth = yearMonth.plusMonths(1)
+        return nextMonth.atDay(monthStartDay).minusDays(1)
+    }
+    
+    /**
+     * 检查日期是否在指定的记账月份内
+     * @param date 要检查的日期
+     * @param yearMonth 记账月份
+     * @param monthStartDay 月度开始日期（1-28）
+     * @return 是否在该记账月份内
+     */
+    fun isInAccountingMonth(date: Date, yearMonth: YearMonth, monthStartDay: Int): Boolean {
+        val localDate = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate()
+        return isInAccountingMonth(localDate, yearMonth, monthStartDay)
+    }
+    
+    /**
+     * 检查日期是否在指定的记账月份内
+     * @param date 要检查的日期
+     * @param yearMonth 记账月份
+     * @param monthStartDay 月度开始日期（1-28）
+     * @return 是否在该记账月份内
+     */
+    fun isInAccountingMonth(date: LocalDate, yearMonth: YearMonth, monthStartDay: Int): Boolean {
+        val startDate = getMonthStartDate(yearMonth, monthStartDay)
+        val endDate = getMonthEndDate(yearMonth, monthStartDay)
+        
+        return date >= startDate && date <= endDate
+    }
+}

app/src/main/java/com/yovinchen/bookkeeping/utils/FilePickerUtil.kt

@@ -10,40 +10,72 @@ import com.yovinchen.bookkeeping.getPreregisteredFilePickerLauncher
 import java.io.File
 import java.io.FileOutputStream
 
+/**
+ * 文件选择器工具类
+ * 用于处理文件选择、权限获取和文件处理的工具类
+ * 
+ * 主要功能：
+ * 1. 启动系统文件选择器
+ * 2. 处理选择结果
+ * 3. 将选择的文件复制到应用缓存目录
+ * 4. 文件类型验证
+ */
 object FilePickerUtil {
+    /**
+     * 当前活跃的文件选择回调
+     * 用于在文件选择完成后调用
+     */
     private var currentCallback: ((File) -> Unit)? = null
 
+    /**
+     * 启动文件选择器
+     * 
+     * @param activity 当前活动，用于启动文件选择器
+     * @param onFileSelected 文件选择完成后的回调函数，参数为选中的文件
+     */
     fun startFilePicker(activity: ComponentActivity, onFileSelected: (File) -> Unit) {
         currentCallback = onFileSelected
         
         try {
+            // 设置可选择的文件类型，限制为CSV和Excel文件
             val mimeTypes = arrayOf(
                 "text/csv",
                 "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
                 "application/vnd.ms-excel"
             )
+            // 使用预注册的文件选择器启动文件选择流程
             activity.getPreregisteredFilePickerLauncher().launch(mimeTypes)
         } catch (e: Exception) {
+            // 文件选择器启动失败时显示错误提示
             Toast.makeText(activity, "无法启动文件选择器：${e.message}", Toast.LENGTH_SHORT).show()
             currentCallback = null
         }
     }
 
+    /**
+     * 处理文件选择结果
+     * 
+     * @param context 上下文对象，用于访问ContentResolver
+     * @param uri 选中文件的URI，如果用户取消选择则为null
+     */
     fun handleFileSelection(context: Context, uri: Uri?) {
         if (uri == null) {
+            // 用户未选择文件时显示提示
             Toast.makeText(context, "未选择文件", Toast.LENGTH_SHORT).show()
             currentCallback = null
             return
         }
 
         try {
+            // 获取文件MIME类型
             val mimeType = context.contentResolver.getType(uri)
+            // 验证文件类型是否合法
             if (!isValidFileType(uri.toString(), mimeType)) {
                 Toast.makeText(context, "请选择CSV或Excel文件", Toast.LENGTH_SHORT).show()
                 return
             }
 
-            // 获取持久性权限
+            // 获取持久性权限，确保应用在重启后仍能访问该文件
             val takeFlags: Int = Intent.FLAG_GRANT_READ_URI_PERMISSION or
                     Intent.FLAG_GRANT_WRITE_URI_PERMISSION
             context.contentResolver.takePersistableUriPermission(uri, takeFlags)
@@ -51,6 +83,7 @@ object FilePickerUtil {
             // 将选中的文件复制到应用私有目录
             val tempFile = copyUriToTempFile(context, uri)
             if (tempFile != null) {
+                // 调用回调函数，传递临时文件
                 currentCallback?.invoke(tempFile)
             } else {
                 Toast.makeText(context, "文件处理失败，请重试", Toast.LENGTH_SHORT).show()
@@ -59,10 +92,18 @@ object FilePickerUtil {
             e.printStackTrace()
             Toast.makeText(context, "文件处理出错：${e.message}", Toast.LENGTH_SHORT).show()
         } finally {
+            // 清除回调引用，避免内存泄漏
             currentCallback = null
         }
     }
 
+    /**
+     * 验证文件类型是否合法
+     * 
+     * @param fileName 文件名，用于检查文件扩展名
+     * @param mimeType 文件MIME类型
+     * @return 如果文件类型合法则返回true，否则返回false
+     */
     private fun isValidFileType(fileName: String, mimeType: String?): Boolean {
         val fileExtension = fileName.lowercase()
         return fileExtension.endsWith(".csv") || 
@@ -73,11 +114,20 @@ object FilePickerUtil {
                mimeType == "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
     }
 
+    /**
+     * 将URI指向的文件复制到应用缓存目录
+     * 
+     * @param context 上下文对象，用于访问ContentResolver和缓存目录
+     * @param uri 要复制的文件URI
+     * @return 复制后的临时文件，如果复制失败则返回null
+     */
     private fun copyUriToTempFile(context: Context, uri: Uri): File? {
         return try {
+            // 获取文件名，如果无法获取则使用时间戳作为文件名
             val fileName = getFileName(context, uri) ?: "temp_backup_${System.currentTimeMillis()}"
             val tempFile = File(context.cacheDir, fileName)
             
+            // 从URI读取内容并写入临时文件
             context.contentResolver.openInputStream(uri)?.use { inputStream ->
                 FileOutputStream(tempFile).use { outputStream ->
                     inputStream.copyTo(outputStream)
@@ -90,6 +140,13 @@ object FilePickerUtil {
         }
     }
 
+    /**
+     * 从URI中获取文件名
+     * 
+     * @param context 上下文对象，用于访问ContentResolver
+     * @param uri 文件URI
+     * @return 文件名，如果无法获取则返回null
+     */
     private fun getFileName(context: Context, uri: Uri): String? {
         var fileName: String? = null
         context.contentResolver.query(uri, null, null, null, null)?.use { cursor ->

app/src/main/java/com/yovinchen/bookkeeping/utils/IconManager.kt

@@ -6,77 +6,126 @@ import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.res.vectorResource
 import com.yovinchen.bookkeeping.R
 
+/**
+ * 图标管理器
+ * 集中管理应用中使用的各类图标资源
+ * 
+ * 主要功能：
+ * 1. 管理分类图标和成员图标的映射关系
+ * 2. 提供根据名称获取对应图标的方法
+ * 3. 提供获取所有可用图标的方法
+ */
 object IconManager {
-    // 类别图标映射
+    /**
+     * 类别图标映射
+     * 将分类名称映射到对应的图标资源ID
+     */
     private val categoryIcons = mapOf(
-        "餐饮" to R.drawable.ic_category_food_24dp,
-        "交通" to R.drawable.ic_category_taxi_24dp,
-        "购物" to R.drawable.ic_category_supermarket_24dp,
-        "娱乐" to R.drawable.ic_category_bar_24dp,
-        "居住" to R.drawable.ic_category_hotel_24dp,
-        "医疗" to R.drawable.ic_category_medicine_24dp,
-        "教育" to R.drawable.ic_category_training_24dp,
-        "宠物" to R.drawable.ic_category_pet_24dp,
-        "鲜花" to R.drawable.ic_category_flower_24dp,
-        "外卖" to R.drawable.ic_category_delivery_24dp,
-        "数码" to R.drawable.ic_category_digital_24dp,
-        "化妆品" to R.drawable.ic_category_cosmetics_24dp,
-        "水果" to R.drawable.ic_category_fruit_24dp,
-        "零食" to R.drawable.ic_category_snack_24dp,
-        "蔬菜" to R.drawable.ic_category_vegetable_24dp,
-        "工资" to R.drawable.ic_category_membership_24dp,
-        "礼物" to R.drawable.ic_category_gift_24dp,
-        "其他" to R.drawable.ic_category_more_24dp,
-        "工资" to R.drawable.ic_category_membership_24dp,
-        "会员" to R.drawable.ic_category_membership_24dp,
-        "奖金" to R.drawable.ic_category_gift_24dp,
-        "投资" to R.drawable.ic_category_digital_24dp,
-        "其他" to R.drawable.ic_category_more_24dp
+        "餐饮" to R.drawable.ic_category_food_24dp,        // 餐饮类别对应食物图标
+        "交通" to R.drawable.ic_category_taxi_24dp,        // 交通类别对应出租车图标
+        "购物" to R.drawable.ic_category_supermarket_24dp, // 购物类别对应超市图标
+        "娱乐" to R.drawable.ic_category_bar_24dp,         // 娱乐类别对应酒吧图标
+        "居住" to R.drawable.ic_category_hotel_24dp,       // 居住类别对应酒店图标
+        "医疗" to R.drawable.ic_category_medicine_24dp,    // 医疗类别对应药品图标
+        "教育" to R.drawable.ic_category_training_24dp,    // 教育类别对应培训图标
+        "宠物" to R.drawable.ic_category_pet_24dp,         // 宠物类别对应宠物图标
+        "鲜花" to R.drawable.ic_category_flower_24dp,      // 鲜花类别对应花图标
+        "外卖" to R.drawable.ic_category_delivery_24dp,    // 外卖类别对应外卖图标
+        "数码" to R.drawable.ic_category_digital_24dp,     // 数码类别对应数码产品图标
+        "化妆品" to R.drawable.ic_category_cosmetics_24dp, // 化妆品类别对应化妆品图标
+        "水果" to R.drawable.ic_category_fruit_24dp,       // 水果类别对应水果图标
+        "零食" to R.drawable.ic_category_snack_24dp,       // 零食类别对应零食图标
+        "蔬菜" to R.drawable.ic_category_vegetable_24dp,   // 蔬菜类别对应蔬菜图标
+        "工资" to R.drawable.ic_category_membership_24dp,  // 工资类别对应会员图标
+        "礼物" to R.drawable.ic_category_gift_24dp,        // 礼物类别对应礼物图标
+        "其他" to R.drawable.ic_category_more_24dp,        // 其他类别对应更多图标
+        "会员" to R.drawable.ic_category_membership_24dp,  // 会员类别对应会员图标
+        "奖金" to R.drawable.ic_category_gift_24dp,        // 奖金类别对应礼物图标
+        "投资" to R.drawable.ic_category_digital_24dp      // 投资类别对应数码图标
     )
 
-    // 成员图标映射
+    /**
+     * 成员图标映射
+     * 将成员角色名称映射到对应的图标资源ID
+     */
     private val memberIcons = mapOf(
-        "自己" to R.drawable.ic_member_boy_24dp,
-        "老婆" to R.drawable.ic_member_bride_24dp,
-        "老公" to R.drawable.ic_member_groom_24dp,
-        "家庭" to R.drawable.ic_member_family_24dp,
-        "儿子" to R.drawable.ic_member_baby_boy_24dp,
-        "女儿" to R.drawable.ic_member_baby_girl_24dp,
-        "爸爸" to R.drawable.ic_member_father_24dp,
-        "妈妈" to R.drawable.ic_member_mother_24dp,
-        "爷爷" to R.drawable.ic_member_grandfather_24dp,
-        "奶奶" to R.drawable.ic_member_grandmother_24dp,
-        "男生" to R.drawable.ic_member_boy_24dp,
-        "女生" to R.drawable.ic_member_girl_24dp,
-        "外公" to R.drawable.ic_member_grandfather_24dp,
-        "外婆" to R.drawable.ic_member_grandmother_24dp,
-        "其他" to R.drawable.ic_member_girl_24dp
+        "自己" to R.drawable.ic_member_boy_24dp,           // 自己对应男孩图标
+        "老婆" to R.drawable.ic_member_bride_24dp,         // 老婆对应新娘图标
+        "老公" to R.drawable.ic_member_groom_24dp,         // 老公对应新郎图标
+        "家庭" to R.drawable.ic_member_family_24dp,        // 家庭对应家庭图标
+        "儿子" to R.drawable.ic_member_baby_boy_24dp,      // 儿子对应男婴图标
+        "女儿" to R.drawable.ic_member_baby_girl_24dp,     // 女儿对应女婴图标
+        "爸爸" to R.drawable.ic_member_father_24dp,        // 爸爸对应父亲图标
+        "妈妈" to R.drawable.ic_member_mother_24dp,        // 妈妈对应母亲图标
+        "爷爷" to R.drawable.ic_member_grandfather_24dp,   // 爷爷对应祖父图标
+        "奶奶" to R.drawable.ic_member_grandmother_24dp,   // 奶奶对应祖母图标
+        "男生" to R.drawable.ic_member_boy_24dp,           // 男生对应男孩图标
+        "女生" to R.drawable.ic_member_girl_24dp,          // 女生对应女孩图标
+        "外公" to R.drawable.ic_member_grandfather_24dp,   // 外公对应祖父图标
+        "外婆" to R.drawable.ic_member_grandmother_24dp,   // 外婆对应祖母图标
+        "其他" to R.drawable.ic_member_girl_24dp           // 其他成员使用女孩图标作为默认值
     )
 
+    /**
+     * 获取分类对应的图标向量
+     * 用于在Compose UI中直接使用
+     * 
+     * @param name 分类名称
+     * @return 对应的图标向量，如果未找到则返回null
+     */
     @Composable
     fun getCategoryIconVector(name: String): ImageVector? {
         return categoryIcons[name]?.let { ImageVector.vectorResource(id = it) }
     }
 
+    /**
+     * 获取成员对应的图标向量
+     * 用于在Compose UI中直接使用
+     * 
+     * @param name 成员名称
+     * @return 对应的图标向量，如果未找到则返回null
+     */
     @Composable
     fun getMemberIconVector(name: String): ImageVector? {
         return memberIcons[name]?.let { ImageVector.vectorResource(id = it) }
     }
 
+    /**
+     * 获取分类对应的图标资源ID
+     * 
+     * @param name 分类名称
+     * @return 对应的图标资源ID，如果未找到则返回null
+     */
     @DrawableRes
     fun getCategoryIcon(name: String): Int? {
         return categoryIcons[name]
     }
 
+    /**
+     * 获取成员对应的图标资源ID
+     * 
+     * @param name 成员名称
+     * @return 对应的图标资源ID，如果未找到则返回null
+     */
     @DrawableRes
     fun getMemberIcon(name: String): Int? {
         return memberIcons[name]
     }
 
+    /**
+     * 获取所有可用的分类图标资源ID列表
+     * 
+     * @return 所有分类图标的资源ID列表
+     */
     fun getAllCategoryIcons(): List<Int> {
         return categoryIcons.values.toList()
     }
 
+    /**
+     * 获取所有可用的成员图标资源ID列表
+     * 
+     * @return 所有成员图标的资源ID列表
+     */
     fun getAllMemberIcons(): List<Int> {
         return memberIcons.values.toList()
     }

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

@@ -4,21 +4,22 @@ import android.app.Application
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.yovinchen.bookkeeping.data.BookkeepingDatabase
+import com.yovinchen.bookkeeping.data.SettingsRepository
 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
+import com.yovinchen.bookkeeping.utils.DateUtils
 import kotlinx.coroutines.flow.*
 import kotlinx.coroutines.launch
-import java.time.LocalDateTime
 import java.time.YearMonth
-import java.time.ZoneId
 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 settingsRepository = SettingsRepository(BookkeepingDatabase.getDatabase(application).settingsDao())
 
     private val _startMonth = MutableStateFlow(YearMonth.now())
     val startMonth: StateFlow<YearMonth> = _startMonth.asStateFlow()
@@ -38,16 +39,41 @@ class AnalysisViewModel(application: Application) : AndroidViewModel(application
     private val _records = MutableStateFlow<List<BookkeepingRecord>>(emptyList())
     val records: StateFlow<List<BookkeepingRecord>> = _records.asStateFlow()
 
+    // 存储月度开始日期设置
+    private val _monthStartDay = MutableStateFlow(1)
+    val monthStartDay: StateFlow<Int> = _monthStartDay.asStateFlow()
+
     init {
+        // 订阅设置变化，获取月度开始日期
         viewModelScope.launch {
-            combine(startMonth, endMonth, selectedAnalysisType) { start, end, type ->
-                Triple(start, end, type)
-            }.collect { (start, end, type) ->
-                updateStats(start, end, type)
+            settingsRepository.getSettings().collect { settings ->
+                _monthStartDay.value = settings?.monthStartDay ?: 1
+            }
+        }
+        
+        // 当月度开始日期、起始月份、结束月份或分析类型变化时，更新统计数据
+        viewModelScope.launch {
+            combine(
+                startMonth, 
+                endMonth, 
+                selectedAnalysisType,
+                monthStartDay
+            ) { start, end, type, startDay ->
+                UpdateParams(start, end, type, startDay)
+            }.collect { params ->
+                updateStats(params.start, params.end, params.type, params.startDay)
             }
         }
     }
 
+    // 用于传递更新参数的数据类
+    private data class UpdateParams(
+        val start: YearMonth,
+        val end: YearMonth,
+        val type: AnalysisType,
+        val startDay: Int
+    )
+
     fun setStartMonth(month: YearMonth) {
         _startMonth.value = month
     }
@@ -60,16 +86,16 @@ class AnalysisViewModel(application: Application) : AndroidViewModel(application
         _selectedAnalysisType.value = type
     }
 
-    private suspend fun updateStats(startMonth: YearMonth, endMonth: YearMonth, type: AnalysisType) {
+    private suspend fun updateStats(startMonth: YearMonth, endMonth: YearMonth, type: AnalysisType, monthStartDay: Int) {
         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))
+        // 使用 DateUtils 过滤日期范围内的记录
+        val monthRecords = records.filter { record ->
+            val recordDate = Date(record.date.time)
+            val accountingMonth = DateUtils.getAccountingMonth(recordDate, monthStartDay)
+            
+            // 检查记账月份是否在选定的范围内
+            accountingMonth >= startMonth && accountingMonth <= endMonth
         }
 
         // 更新记录数据

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

@@ -4,10 +4,12 @@ import android.app.Application
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.yovinchen.bookkeeping.data.BookkeepingDatabase
+import com.yovinchen.bookkeeping.data.SettingsRepository
 import com.yovinchen.bookkeeping.model.BookkeepingRecord
 import com.yovinchen.bookkeeping.model.Category
 import com.yovinchen.bookkeeping.model.Member
 import com.yovinchen.bookkeeping.model.TransactionType
+import com.yovinchen.bookkeeping.utils.DateUtils
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.*
 import kotlinx.coroutines.launch
@@ -18,9 +20,26 @@ import java.util.*
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class HomeViewModel(application: Application) : AndroidViewModel(application) {
-    private val bookkeepingDao = BookkeepingDatabase.getDatabase(application).bookkeepingDao()
-    private val memberDao = BookkeepingDatabase.getDatabase(application).memberDao()
-    private val categoryDao = BookkeepingDatabase.getDatabase(application).categoryDao()
+    private val database = BookkeepingDatabase.getDatabase(application)
+    private val bookkeepingDao = database.bookkeepingDao()
+    private val memberDao = database.memberDao()
+    private val categoryDao = database.categoryDao()
+    private val settingsRepository = SettingsRepository(database.settingsDao())
+    
+    // 设置相关
+    private val _monthStartDay = MutableStateFlow(1)
+    val monthStartDay: StateFlow<Int> = _monthStartDay.asStateFlow()
+    
+    init {
+        viewModelScope.launch {
+            settingsRepository.ensureSettingsExist()
+            settingsRepository.getSettings().collect { settings ->
+                settings?.let {
+                    _monthStartDay.value = it.monthStartDay
+                }
+            }
+        }
+    }
 
     private val _selectedRecordType = MutableStateFlow<TransactionType?>(null)
     val selectedRecordType: StateFlow<TransactionType?> = _selectedRecordType.asStateFlow()
@@ -56,17 +75,13 @@ class HomeViewModel(application: Application) : AndroidViewModel(application) {
         allRecords,
         _selectedRecordType,
         _selectedMonth,
-        _selectedMember
-    ) { records, selectedType, selectedMonth, selectedMember ->
+        _selectedMember,
+        _monthStartDay
+    ) { records, selectedType, selectedMonth, selectedMember, monthStartDay ->
         records
             .filter { record ->
-                val recordDate = record.date.toInstant()
-                    .atZone(ZoneId.systemDefault())
-                    .toLocalDate()
-                val recordYearMonth = YearMonth.from(recordDate)
-
                 val typeMatches = selectedType?.let { record.type == it } ?: true
-                val monthMatches = recordYearMonth == selectedMonth
+                val monthMatches = DateUtils.isInAccountingMonth(record.date, selectedMonth, monthStartDay)
                 val memberMatches = selectedMember?.let { record.memberId == it.id } ?: true
 
                 monthMatches && memberMatches && typeMatches
@@ -90,16 +105,12 @@ class HomeViewModel(application: Application) : AndroidViewModel(application) {
     val totalIncome = combine(
         allRecords,
         _selectedMonth,
-        _selectedMember
-    ) { records, selectedMonth, selectedMember ->
+        _selectedMember,
+        _monthStartDay
+    ) { records, selectedMonth, selectedMember, monthStartDay ->
         records
             .filter { record ->
-                val recordDate = record.date.toInstant()
-                    .atZone(ZoneId.systemDefault())
-                    .toLocalDate()
-                val recordYearMonth = YearMonth.from(recordDate)
-                
-                val monthMatches = recordYearMonth == selectedMonth
+                val monthMatches = DateUtils.isInAccountingMonth(record.date, selectedMonth, monthStartDay)
                 val memberMatches = selectedMember?.let { record.memberId == it.id } ?: true
                 val typeMatches = record.type == TransactionType.INCOME
 
@@ -115,16 +126,12 @@ class HomeViewModel(application: Application) : AndroidViewModel(application) {
     val totalExpense = combine(
         allRecords,
         _selectedMonth,
-        _selectedMember
-    ) { records, selectedMonth, selectedMember ->
+        _selectedMember,
+        _monthStartDay
+    ) { records, selectedMonth, selectedMember, monthStartDay ->
         records
             .filter { record ->
-                val recordDate = record.date.toInstant()
-                    .atZone(ZoneId.systemDefault())
-                    .toLocalDate()
-                val recordYearMonth = YearMonth.from(recordDate)
-                
-                val monthMatches = recordYearMonth == selectedMonth
+                val monthMatches = DateUtils.isInAccountingMonth(record.date, selectedMonth, monthStartDay)
                 val memberMatches = selectedMember?.let { record.memberId == it.id } ?: true
                 val typeMatches = record.type == TransactionType.EXPENSE
 

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

@@ -9,8 +9,10 @@ import androidx.lifecycle.viewModelScope
 import com.opencsv.CSVReader
 import com.opencsv.CSVWriter
 import com.yovinchen.bookkeeping.data.BookkeepingDatabase
+import com.yovinchen.bookkeeping.data.SettingsRepository
 import com.yovinchen.bookkeeping.model.BookkeepingRecord
 import com.yovinchen.bookkeeping.model.Category
+import com.yovinchen.bookkeeping.model.Settings
 import com.yovinchen.bookkeeping.model.TransactionType
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
@@ -38,8 +40,36 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
     private val database = BookkeepingDatabase.getDatabase(application)
     private val dao = database.bookkeepingDao()
     private val memberDao = database.memberDao()
+    private val settingsRepository = SettingsRepository(database.settingsDao())
+    
+    // 设置相关的状态
+    val settings: StateFlow<Settings?> = settingsRepository.getSettings()
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5000),
+            initialValue = null
+        )
+    
     private val _isAutoBackupEnabled = MutableStateFlow(false)
     val isAutoBackupEnabled: StateFlow<Boolean> = _isAutoBackupEnabled.asStateFlow()
+    
+    private val _monthStartDay = MutableStateFlow(1)
+    val monthStartDay: StateFlow<Int> = _monthStartDay.asStateFlow()
+    
+    init {
+        viewModelScope.launch {
+            // 确保设置存在
+            settingsRepository.ensureSettingsExist()
+            
+            // 监听设置变化
+            settings.collect { settings ->
+                settings?.let {
+                    _isAutoBackupEnabled.value = it.autoBackupEnabled
+                    _monthStartDay.value = it.monthStartDay
+                }
+            }
+        }
+    }
 
     private val _selectedCategoryType = MutableStateFlow(TransactionType.EXPENSE)
     val selectedCategoryType: StateFlow<TransactionType> = _selectedCategoryType.asStateFlow()
@@ -85,11 +115,19 @@ class SettingsViewModel(application: Application) : AndroidViewModel(application
     fun setAutoBackup(enabled: Boolean) {
         viewModelScope.launch {
             _isAutoBackupEnabled.value = enabled
+            settingsRepository.updateAutoBackupEnabled(enabled)
             if (enabled) {
                 schedulePeriodicBackup()
             }
         }
     }
+    
+    fun setMonthStartDay(day: Int) {
+        viewModelScope.launch {
+            _monthStartDay.value = day
+            settingsRepository.updateMonthStartDay(day)
+        }
+    }
 
     private fun schedulePeriodicBackup() {
         viewModelScope.launch(Dispatchers.IO) {