과제1 정건희 제출_3

app/build.gradle.kts

@@ -17,6 +17,9 @@ android {
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
 
+    buildFeatures{
+        viewBinding = true
+    }
     buildTypes {
         release {
             isMinifyEnabled = false
@@ -42,4 +45,8 @@ dependencies {
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
+
+    implementation(libs.androidx.lifecycle.viewmodel.ktx)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
+
 }

app/src/main/java/com/alom/androidstudy1/MainActivity.kt

@@ -1,20 +1,43 @@
 package com.alom.androidstudy1
 
 import android.os.Bundle
-import androidx.activity.enableEdgeToEdge
+import android.util.Log
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.view.ViewCompat
-import androidx.core.view.WindowInsetsCompat
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import com.alom.androidstudy1.databinding.ActivityMainBinding
+import kotlinx.coroutines.launch
 
 class MainActivity : AppCompatActivity() {
+    private lateinit var memoViewModel: MemoViewModel
+    private lateinit var binding : ActivityMainBinding
+    private val TAG = "MainActivity"
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        enableEdgeToEdge()
-        setContentView(R.layout.activity_main)
-        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
-            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
-            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
-            insets
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+        val sharedPreferences = getSharedPreferences("memo", MODE_PRIVATE)
+        val memoRepository = MemoRepositoryImpl(sharedPreferences)
+
+        val memoViewModelFactory = MemoViewModelFactory(memoRepository)
+
+        memoViewModel = ViewModelProvider(this,memoViewModelFactory).get(MemoViewModel::class.java)
+
+        lifecycleScope.launch{
+            lifecycle.repeatOnLifecycle(Lifecycle.State.STARTED){
+                launch {
+                    memoViewModel.currentValue.collect{
+                        binding.etMemo.setText(it)
+                    }
+                }
+            }
+        }
+
+        binding.btnSave.setOnClickListener {
+            memoViewModel.saveMemo(binding.etMemo.text.toString())
         }
     }
 }

app/src/main/java/com/alom/androidstudy1/MemoRepository.kt

@@ -0,0 +1,7 @@
+package com.alom.androidstudy1
+
+interface MemoRepository {
+    //메모를 가져오는 추상함수와 메모를 설정하는 추상함수 설정
+    fun getMemo():String
+    fun setMemo(input:String):Unit
+}

app/src/main/java/com/alom/androidstudy1/MemoRepositoryImpl.kt

@@ -0,0 +1,14 @@
+package com.alom.androidstudy1
+
+import android.content.SharedPreferences
+
+class MemoRepositoryImpl(private val sharedPreferences: SharedPreferences) : MemoRepository {
+    override fun getMemo(): String {
+        return sharedPreferences.getString("memo", "").toString()
+    }
+    override fun setMemo(input: String) {
+        val editor = sharedPreferences.edit()
+        editor.putString("memo", input)
+        editor.apply()
+    }
+}

app/src/main/java/com/alom/androidstudy1/MemoViewModel.kt

@@ -0,0 +1,26 @@
+package com.alom.androidstudy1
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+
+class MemoViewModel(private val repository: MemoRepository) : ViewModel() {
+
+    private val _currentValue = MutableStateFlow<String>("")
+    val currentValue: StateFlow<String>
+        get() = _currentValue
+
+    init { //초기값 설정
+        viewModelScope.launch {
+            _currentValue.emit(repository.getMemo())
+        }
+    }
+
+    fun saveMemo(memo: String) {
+        viewModelScope.launch {
+            _currentValue.emit(memo)
+            repository.setMemo(memo)
+        }
+    }
+}

app/src/main/java/com/alom/androidstudy1/MemoViewModelFactory.kt

@@ -0,0 +1,15 @@
+package com.alom.androidstudy1
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+
+
+class MemoViewModelFactory(private val memoRepository: MemoRepository) : ViewModelProvider.Factory {
+    //ViewModel에 생성자가 있을 경우 factory를 만들어야함
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        if(modelClass.isAssignableFrom(MemoViewModel::class.java)){
+            return MemoViewModel(memoRepository) as T
+        }
+        throw IllegalArgumentException("Unknown ViewModel Class")
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -7,13 +7,37 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
+
     <TextView
+        android:id="@+id/tv_menu_indicator"
         android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
+        android:layout_height="0dp"
+        android:text="메모장"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:textSize="20sp"
+        />
+
+    <EditText
+        android:id="@+id/et_memo"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintTop_toBottomOf="@id/tv_menu_indicator"
+        app:layout_constraintBottom_toTopOf="@id/btn_save"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
+        />
+    <androidx.appcompat.widget.AppCompatButton
+        android:id="@+id/btn_save"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="저장하기"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/et_memo"
+        app:layout_constraintBottom_toBottomOf="parent"
+        />
+
 
 </androidx.constraintlayout.widget.ConstraintLayout>

gradle/libs.versions.toml

@@ -6,12 +6,15 @@ junit = "4.13.2"
 junitVersion = "1.2.1"
 espressoCore = "3.6.1"
 appcompat = "1.7.0"
+lifecycleViewmodelKtx = "2.8.6"
 material = "1.12.0"
 activity = "1.9.2"
 constraintlayout = "2.1.4"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+androidx-lifecycle-runtime-ktx = { module = "androidx.lifecycle:lifecycle-runtime-ktx", version.ref = "lifecycleViewmodelKtx" }
+androidx-lifecycle-viewmodel-ktx = { module = "androidx.lifecycle:lifecycle-viewmodel-ktx", version.ref = "lifecycleViewmodelKtx" }
 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" }