Coroutine - 3 (Room + Coroutine)

개복치개발자 강의는 아래의 링크에서 확인할 수 있습니다.

개복치개발자 | Linktree

 

 자 이번에는 이전에 했던 Room을 좀 더 발전시켜보겠습니다.

 

https://philosopher-chan.tistory.com/1483

Android Room - 5 (Room + ViewModel + ViewModelScope + LiveData)

 

 아래와 같이 매우 간단한 앱입니다.

 

 전체 데이터를 불러오고

 

 데이터를 db에 쌓습니다.

 

 

 

 자, 그러면 이 친구들을 어떻게 하는건지 하나씩 보겠습니다.

 

 일단 xml파일들은 아래와 같고

 

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	xmlns:tools="http://schemas.android.com/tools"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical"
	tools:context=".MainActivity">
	<Button
	android:id="@+id/goToAdd"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="goToAddActivity"
	/>
	<TextView
	android:id="@+id/textArea"
	android:textSize="20dp"
	android:text="text"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"/>
	</LinearLayout>

view raw activity_main.xml hosted with ❤ by GitHub

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	xmlns:tools="http://schemas.android.com/tools"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	tools:context=".AddActivity"
	android:orientation="vertical">
	<Button
	android:id="@+id/add"
	android:text="add"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"/>
	<EditText
	android:id="@+id/addText"
	android:hint="addText"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"/>
	<Button
	android:id="@+id/remove"
	android:text="removeAll"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"/>
	</LinearLayout>

view raw activity_add.xml hosted with ❤ by GitHub

 

 폴더 구조는 아래와 같이 만들었습니다.

 

 

 gradle에 아래와 같이 넣어주고

 

// ROOM
def roomVersion = "2.4.0"

implementation("androidx.room:room-runtime:$roomVersion")
kapt("androidx.room:room-compiler:$roomVersion")
implementation("androidx.room:room-ktx:$roomVersion")

//ViewModelScope
implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.0")

id 'kotlin-kapt'

 

 전체 gradle은 아래와 같습니다.

	plugins {
	id 'com.android.application'
	id 'org.jetbrains.kotlin.android'
	id 'kotlin-kapt'
	}
	android {
	compileSdk 31
	defaultConfig {
	applicationId "com.bokchi.androidview"
	minSdk 21
	targetSdk 31
	versionCode 1
	versionName "1.0"
	testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
	}
	buildTypes {
	release {
	minifyEnabled false
	proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
	}
	}
	compileOptions {
	sourceCompatibility JavaVersion.VERSION_1_8
	targetCompatibility JavaVersion.VERSION_1_8
	}
	kotlinOptions {
	jvmTarget = '1.8'
	}
	}
	dependencies {
	implementation 'androidx.core:core-ktx:1.7.0'
	implementation 'androidx.appcompat:appcompat:1.4.1'
	implementation 'com.google.android.material:material:1.5.0'
	implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
	testImplementation 'junit:junit:4.13.2'
	androidTestImplementation 'androidx.test.ext:junit:1.1.3'
	androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
	// ROOM
	def roomVersion = "2.4.0"
	implementation("androidx.room:room-runtime:$roomVersion")
	kapt("androidx.room:room-compiler:$roomVersion")
	implementation("androidx.room:room-ktx:$roomVersion")
	//ViewModelScope
	implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.0")
	}

view raw build.gradle hosted with ❤ by GitHub

 

그리고 나머지 코드들

 

	@Entity(tableName = "myData_table")
	data class MyData (
	@PrimaryKey
	@ColumnInfo(name = "myData")
	val myData: String
	)

view raw MyData.kt hosted with ❤ by GitHub

	@Dao
	interface MyDataDao {
	@Insert(onConflict = OnConflictStrategy.IGNORE)
	suspend fun insert(myData : MyData)
	@Query("SELECT * FROM myData_table")
	suspend fun getAll() : List<MyData>
	@Query("DELETE FROM myData_table")
	suspend fun removeAll()
	}

view raw MyDataDao.kt hosted with ❤ by GitHub

	@Database(entities = [MyData::class], version = 1)
	abstract class MyDataRoomDatabase : RoomDatabase() {
	abstract fun myDataDao() : MyDataDao
	companion object {
	@Volatile
	private var INSTANCE: MyDataRoomDatabase? = null
	fun getDatabase(
	context: Context
	) : MyDataRoomDatabase {
	return INSTANCE ?: synchronized(this) {
	val instance = Room.databaseBuilder(
	context.applicationContext,
	MyDataRoomDatabase::class.java,
	"myData_database"
	)
	.fallbackToDestructiveMigration()
	.build()
	INSTANCE = instance
	instance
	}
	}
	}
	}

view raw MyDataRoomDatabase.kt hosted with ❤ by GitHub

	class Repository(private val myDataDao: MyDataDao) {
	suspend fun insert(myData: MyData){
	myDataDao.insert(myData)
	}
	suspend fun getAllData(): List<MyData> {
	return myDataDao.getAll()
	}
	suspend fun removeData() {
	myDataDao.removeAll()
	}
	}

view raw Repository.kt hosted with ❤ by GitHub

	class MyDataViewModel (application: Application): AndroidViewModel(application) {
	private val repository: Repository
	private var mutableText = MutableLiveData<List<MyData>>()
	val liveText : LiveData<List<MyData>>
	get() = mutableText
	init {
	Log.d("MyDataViewModel", "init")
	repository = Repository(MyDataRoomDatabase.getDatabase(application).myDataDao())
	}
	fun insert(myData: MyData) = viewModelScope.launch(Dispatchers.IO) {
	repository.insert(myData)
	}
	fun getAll() = viewModelScope.launch(Dispatchers.IO) {
	val dataList = repository.getAllData()
	mutableText.postValue(dataList)
	}
	fun removeAll() = viewModelScope.launch(Dispatchers.IO) {
	repository.removeData()
	}
	}

view raw MyDataViewModel.kt hosted with ❤ by GitHub

	class AddActivity : AppCompatActivity() {
	lateinit var viewModel: MyDataViewModel
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	setContentView(R.layout.activity_add)
	viewModel = ViewModelProvider(this).get(MyDataViewModel::class.java)
	val addBtn = findViewById<Button>(R.id.add)
	addBtn.setOnClickListener {
	val addText = findViewById<EditText>(R.id.addText).text.toString()
	val myData = MyData(addText)
	viewModel.insert(myData)
	}
	val removeBtn = findViewById<Button>(R.id.remove)
	removeBtn.setOnClickListener {
	viewModel.removeAll()
	}
	}
	}

view raw AddActivity.kt hosted with ❤ by GitHub

	class MainActivity : AppCompatActivity() {
	lateinit var viewModel: MyDataViewModel
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	setContentView(R.layout.activity_main)
	viewModel = ViewModelProvider(this)[MyDataViewModel::class.java]
	val addBtn = findViewById<Button>(R.id.goToAdd)
	addBtn.setOnClickListener {
	val intent = Intent(this, AddActivity::class.java)
	startActivity(intent)
	}
	val textArea = findViewById<TextView>(R.id.textArea)
	viewModel.liveText.observe(this, Observer {
	textArea.text = it.toString()
	})
	}
	override fun onResume() {
	super.onResume()
	viewModel.getAll()
	}
	}

view raw MainActivity.kt hosted with ❤ by GitHub