将数据库使用Jetpack Room重构

app/build.gradle.kts

@@ -1,6 +1,7 @@
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
+    id("com.google.devtools.ksp")
 }
 
 val baseVersionName = "1.0.0"
@@ -60,6 +61,11 @@ dependencies {
     implementation("androidx.preference:preference-ktx:1.2.1")
     // Material Design
     implementation("com.google.android.material:material:1.12.0-alpha02")
+    // Room
+    implementation("androidx.room:room-runtime:2.6.1")
+    implementation("androidx.room:room-ktx:2.6.1")
+    annotationProcessor("androidx.room:room-compiler:2.6.1")
+    ksp("androidx.room:room-compiler:2.6.1")
     // Test
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")

app/src/main/kotlin/cn/super12138/todo/ToDoApplication.kt

@@ -3,13 +3,19 @@ package cn.super12138.todo
 import android.annotation.SuppressLint
 import android.app.Application
 import android.content.Context
+import cn.super12138.todo.logic.dao.ToDoRoomDB
 import cn.super12138.todo.views.crash.CrashHandler
 import com.google.android.material.color.DynamicColors
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 
 class ToDoApplication : Application() {
+    private val database by lazy { ToDoRoomDB.getDatabase(this) }
     companion object {
         @SuppressLint("StaticFieldLeak")
         lateinit var context: Context
+        lateinit var db: ToDoRoomDB
     }
 
     override fun onCreate() {
@@ -19,5 +25,7 @@ class ToDoApplication : Application() {
 
         val crashHandler = CrashHandler(this)
         Thread.setDefaultUncaughtExceptionHandler(crashHandler)
+
+        db = database
     }
 }

app/src/main/kotlin/cn/super12138/todo/logic/Repository.kt

@@ -1,21 +1,88 @@
 package cn.super12138.todo.logic
 
-import android.content.ContentValues
 import android.content.Context
-import cn.super12138.todo.logic.database.DBHelper
+import cn.super12138.todo.ToDoApplication
+import cn.super12138.todo.logic.dao.ToDoRoom
 import cn.super12138.todo.logic.database.SPHelper
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 
 object Repository {
-    fun getCompleteTotalCount() = DBHelper.getCompleteTotalCount()
+    /**
+     * 获取应用设置里的数据
+     */
+    fun getPreferenceString(context: Context, key: String, defaultValue: String) =
+        SPHelper.getPreferenceString(context, key, defaultValue)
 
-    fun insertData(data: ContentValues) = DBHelper.insertData(data)
+    // Room
+    private val db get() = ToDoApplication.db
+    val todoDao = db.toDoRoomDao()
 
-    fun deleteData(deleteAll: Boolean, uuid: String?) = DBHelper.deleteData(deleteAll, uuid)
+    /**
+     * @param toDoRoom 要插入的数据
+     */
+    suspend fun insert(toDoRoom: ToDoRoom) {
+        withContext(Dispatchers.IO) {
+            todoDao.insert(toDoRoom)
+        }
+    }
 
-    fun updateData(uuid: String, newData: ContentValues) = DBHelper.updateData(uuid, newData)
+    /**
+     * 获取全部未完成的待办
+     * @return List<ToDoRoom>
+     */
+    suspend fun getAllUncomplete(): List<ToDoRoom> {
+        return withContext(Dispatchers.IO) {
+            todoDao.getAllUnfinished()
+        }
+    }
 
-    fun getAllData() = DBHelper.getAllData()
+    /**
+     * 获取全部已完成的待办
+     * @return List<ToDoRoom>
+     */
+    suspend fun getAllComplete(): List<ToDoRoom> {
+        return withContext(Dispatchers.IO) {
+            todoDao.getAllComplete()
+        }
+    }
 
-    fun getPreferenceString(context: Context, key: String, defaultValue: String) =
-        SPHelper.getPreferenceString(context, key, defaultValue)
+    /**
+     * 获取全部待办
+     * @return List<ToDoRoom>
+     */
+    suspend fun getAll(): List<ToDoRoom> {
+        return withContext(Dispatchers.IO) {
+            todoDao.getAll()
+        }
+    }
+
+    /**
+     * 根据待办的UUID删除指定待办
+     * @param uuid 待办的UUID
+     */
+    suspend fun deleteByUUID(uuid: String) {
+        withContext(Dispatchers.IO) {
+            todoDao.deleteByUUID(uuid)
+        }
+    }
+
+    /**
+     * 删除全部代办
+     */
+    suspend fun deleteAll() {
+        withContext(Dispatchers.IO) {
+            todoDao.deleteAll()
+        }
+    }
+
+    /**
+     * 根据代办的UUID来把待办状态更新为“已完成”
+     * @param uuid 待办的UUID
+     */
+    suspend fun updateStateByUUID(uuid: String) {
+        withContext(Dispatchers.IO) {
+            todoDao.updateStateByUUID(uuid)
+        }
+    }
 }

app/src/main/kotlin/cn/super12138/todo/logic/dao/ToDoRoom.kt

@@ -0,0 +1,19 @@
+package cn.super12138.todo.logic.dao
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+/**
+ * @param uuid String 待办的uuid
+ * @param state Int 待办的完成状态，0表示未完成，1表示完成
+ * @param subject String 待办的学科
+ * @param context String 待办的内容
+ */
+@Entity(tableName = "todo")
+data class ToDoRoom(
+    @PrimaryKey @ColumnInfo(name = "uuid") val uuid: String,
+    @ColumnInfo(name = "state") val state: Int,
+    @ColumnInfo(name = "subject") val subject: String,
+    @ColumnInfo(name = "context") val context: String
+)

app/src/main/kotlin/cn/super12138/todo/logic/dao/ToDoRoomDB.kt

@@ -0,0 +1,27 @@
+package cn.super12138.todo.logic.dao
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(entities = [ToDoRoom::class], version = 1)
+abstract class ToDoRoomDB : RoomDatabase() {
+    abstract fun toDoRoomDao(): ToDoRoomDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: ToDoRoomDB? = null
+        fun getDatabase(context: Context): ToDoRoomDB {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    ToDoRoomDB::class.java,
+                    "todo"
+                ).build()
+                INSTANCE = instance
+                instance
+            }
+        }
+    }
+}

app/src/main/kotlin/cn/super12138/todo/logic/dao/ToDoRoomDao.kt

@@ -0,0 +1,29 @@
+package cn.super12138.todo.logic.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+
+@Dao
+interface ToDoRoomDao {
+    @Insert
+    suspend fun insert(toDoRoom: ToDoRoom)
+
+    @Query("SELECT * FROM todo")
+    suspend fun getAll(): List<ToDoRoom>
+
+    @Query("SELECT * FROM todo WHERE state = 0")
+    suspend fun getAllUnfinished(): List<ToDoRoom>
+
+    @Query("SELECT * FROM todo WHERE state = 1")
+    suspend fun getAllComplete(): List<ToDoRoom>
+
+    @Query("DELETE FROM todo")
+    suspend fun deleteAll()
+
+    @Query("DELETE FROM todo WHERE uuid = :uuid")
+    suspend fun deleteByUUID(uuid: String)
+
+    @Query("UPDATE todo SET state = 1 WHERE uuid = :uuid")
+    suspend fun updateStateByUUID(uuid: String)
+}

app/src/main/kotlin/cn/super12138/todo/views/crash/CrashHandler.kt

@@ -3,6 +3,7 @@ package cn.super12138.todo.views.crash
 import android.content.Context
 import android.content.Intent
 import android.os.Process
+import kotlin.system.exitProcess
 
 class CrashHandler(private val context: Context) : Thread.UncaughtExceptionHandler {
 
@@ -18,11 +19,11 @@ class CrashHandler(private val context: Context) : Thread.UncaughtExceptionHandl
         }
         context.startActivity(intent)
 
-        // 杀掉崩溃的应用程序进程
-        Process.killProcess(Process.myPid())
-        System.exit(10)
-
         // 传递异常给默认的异常处理器
         defaultUEH?.uncaughtException(thread, ex)
+
+        // 杀掉崩溃的应用程序进程
+        Process.killProcess(Process.myPid())
+        exitProcess(10)
     }
 }