feat: 数据库架构初步实现

app/src/main/AndroidManifest.xml

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <application
+        android:name=".TodoApp"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"
@@ -11,7 +12,7 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.ToDo"
-        tools:targetApi="31">
+        tools:targetApi="35">
         <activity
             android:name=".MainActivity"
             android:exported="true"

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

@@ -0,0 +1,17 @@
+package cn.super12138.todo
+
+import android.app.Application
+import cn.super12138.todo.logic.database.TodoDatabase
+
+class TodoApp : Application() {
+    private val database by lazy { TodoDatabase.getDatabase(this) }
+
+    companion object {
+        lateinit var db: TodoDatabase
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        db = database
+    }
+}

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

@@ -0,0 +1,20 @@
+package cn.super12138.todo.logic
+
+import cn.super12138.todo.TodoApp
+import cn.super12138.todo.logic.database.TodoEntity
+import kotlinx.coroutines.flow.Flow
+
+object Repository {
+    private val db get() = TodoApp.db
+    private val toDoDao = db.toDoDao()
+
+    suspend fun insertTodo(toDo: TodoEntity) {
+        toDoDao.insert(toDo)
+    }
+
+    fun getAllTodos(): Flow<List<TodoEntity>> = toDoDao.getAll()
+
+    suspend fun updateTodo(toDo: TodoEntity){
+        toDoDao.update(toDo)
+    }
+}

app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDao.kt

@@ -0,0 +1,19 @@
+package cn.super12138.todo.logic.database
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import androidx.room.Update
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface TodoDao {
+    @Insert
+    suspend fun insert(toDo: TodoEntity)
+
+    @Query("SELECT * FROM todo")
+    fun getAll(): Flow<List<TodoEntity>>
+
+    @Update
+    suspend fun update(toDo: TodoEntity)
+}

app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDatabase.kt

@@ -0,0 +1,30 @@
+package cn.super12138.todo.logic.database
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(entities = [TodoEntity::class], version = 2)
+abstract class TodoDatabase : RoomDatabase() {
+    abstract fun toDoDao(): TodoDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: TodoDatabase? = null
+        fun getDatabase(context: Context): TodoDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    TodoDatabase::class.java,
+                    "todo"
+                )
+                    .fallbackToDestructiveMigration()
+                    .build()
+
+                INSTANCE = instance
+                return instance
+            }
+        }
+    }
+}

app/src/main/kotlin/cn/super12138/todo/logic/database/TodoEntity.kt

@@ -0,0 +1,14 @@
+package cn.super12138.todo.logic.database
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "todo")
+data class TodoEntity(
+    @ColumnInfo(name = "type") val type: Int,
+    @ColumnInfo(name = "content") val content: String,
+    @ColumnInfo(name = "subject") val subject: String,
+    @ColumnInfo(name = "completed") val isCompleted: Boolean = false,
+    @PrimaryKey(autoGenerate = true) @ColumnInfo(name = "id") val id: Long = 0L,
+)