add: SQL for note(ListView)

Author: SmallSun697

app/build.gradle.kts

@@ -43,7 +43,6 @@ android {
 }
 
 dependencies {
-
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)
     implementation(libs.androidx.activity.compose)
@@ -52,6 +51,11 @@ dependencies {
     implementation(libs.androidx.ui.graphics)
     implementation(libs.androidx.ui.tooling.preview)
     implementation(libs.androidx.material3)
+
+    implementation(libs.androidx.room.ktx)
+    implementation (libs.androidx.room.runtime)
+    kapt ("androidx.room:room-compiler:2.6.1")
+
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)

app/src/main/java/com/coolkie/noteultra/data/NotesModule.kt

@@ -0,0 +1,90 @@
+package com.coolkie.noteultra.data
+
+import android.content.Context
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewModelScope
+import androidx.room.Dao
+import androidx.room.Database
+import androidx.room.Delete
+import androidx.room.Entity
+import androidx.room.Insert
+import androidx.room.PrimaryKey
+import androidx.room.Query
+import androidx.room.Room
+import androidx.room.RoomDatabase
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+
+@Entity(tableName = "notes")
+data class Note(
+  @PrimaryKey(autoGenerate = true) val id: Int = 0,
+  val title: String,
+  val content: String,
+  val date: Long
+)
+
+@Dao
+interface NotesDao {
+  @Insert
+  suspend fun insert(note: Note)
+
+  @Delete
+  suspend fun delete(note: Note)
+
+  @Query("SELECT * FROM notes ORDER BY date DESC")
+  fun getAllNotes(): Flow<List<Note>>
+}
+
+@Database(entities = [Note::class], version = 1)
+abstract class NotesDatabase : RoomDatabase() {
+  abstract fun noteDao(): NotesDao
+
+  companion object {
+    @Volatile
+    private var INSTANCE: NotesDatabase? = null
+
+    fun getDatabase(context: Context): NotesDatabase {
+      return INSTANCE ?: synchronized(this) {
+        val instance = Room.databaseBuilder(
+          context.applicationContext,
+          NotesDatabase::class.java,
+          "notes_database"
+        ).build()
+
+        INSTANCE = instance
+        instance
+      }
+    }
+  }
+}
+
+class NoteViewModel(private val database: NotesDatabase) : ViewModel() {
+  val noteList = database.noteDao().getAllNotes()
+    .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), emptyList())
+
+  fun addNote(title: String, content: String, date: Long) {
+    val note = Note(title = title, content = content, date = date)
+    viewModelScope.launch {
+      database.noteDao().insert(note)
+    }
+  }
+
+  fun deleteNote(note: Note) {
+    viewModelScope.launch {
+      database.noteDao().delete(note)
+    }
+  }
+}
+
+class NoteViewModelFactory(private val database: NotesDatabase) : ViewModelProvider.Factory {
+  @Suppress("UNCHECKED_CAST")
+  override fun <T : ViewModel> create(modelClass: Class<T>): T {
+    if (modelClass.isAssignableFrom(NoteViewModel::class.java)) {
+      return NoteViewModel(database) as T
+    }
+    throw IllegalArgumentException("Unknown ViewModel class")
+  }
+}

gradle/libs.versions.toml

@@ -8,9 +8,12 @@ espressoCore = "3.6.1"
 lifecycleRuntimeKtx = "2.8.7"
 activityCompose = "1.9.3"
 composeBom = "2024.04.01"
+roomKtx = "2.6.1"
+roomRuntime = "2.6.1"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+androidx-room-runtime = { module = "androidx.room:room-runtime", version.ref = "roomRuntime" }
 junit = { group = "junit", name = "junit", version.ref = "junit" }
 androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
 androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
@@ -24,9 +27,9 @@ androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-toolin
 androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest" }
 androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" }
 androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
+androidx-room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "roomKtx" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
-kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
-
+kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }