과제1 제출

README.md

@@ -1,6 +1,18 @@
 # android_study_14_1
 아롬 안드로이드 14기 스터디 1번
 
+# ToDo
+|내용|완료 여부|
+|---|:---:|
+|MVVM 학습하기|✅|
+|ㄴMVVM 코드 구현|✅|
+|StateFlow 학습하기|✅|
+|ㄴStateFlow 코드 구현|✅|
+|SharedPreferences 이용한 저장 기능 구현|✅|
+|Repository 학습하기||
+
+
+# 과제 설명
 ### 간단하게 메모하고 저장, 불러오는 앱을 만들어봅시다.
 
 단) mvvm + stateflow를 이용해서!

app/build.gradle.kts

@@ -7,6 +7,8 @@ android {
     namespace = "com.alom.androidstudy1"
     compileSdk = 34
 
+    viewBinding.isEnabled = true
+
     defaultConfig {
         applicationId = "com.alom.androidstudy1"
         minSdk = 26
@@ -42,4 +44,5 @@ dependencies {
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
 }

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

@@ -1,20 +1,63 @@
 package com.alom.androidstudy1
 
 import android.os.Bundle
+import android.view.View
+import android.view.View.OnClickListener
+import android.widget.Toast
 import androidx.activity.enableEdgeToEdge
 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() {
+class MainActivity : AppCompatActivity(),OnClickListener {
+    private lateinit var memoViewModel : MemoViewModel
+    private lateinit var binding:ActivityMainBinding
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
-        setContentView(R.layout.activity_main)
+
+        //뷰바인딩 적용
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
         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
         }
+
+        //ViewModel
+        memoViewModel = ViewModelProvider(this).get(MemoViewModel::class.java)
+
+        //버튼 리스너 설정
+        binding.button.setOnClickListener(this)
+
+        lifecycleScope.launch {
+            repeatOnLifecycle(Lifecycle.State.STARTED) {
+                launch {
+                    memoViewModel.currentText.collect{
+                        //EditText Text를 SharedPreferences에서 불러온 글자로 변경
+                        binding.editTextTextMultiLine.setText(it)
+                    }
+                }
+            }
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+
+        memoViewModel.returnMemo(applicationContext)
+    }
+
+    override fun onClick(view: View?) {
+        //SharedPreference 저장 함수 호출
+        memoViewModel.saveMemo(binding.editTextTextMultiLine.text.toString(),applicationContext)
     }
 }

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

@@ -0,0 +1,27 @@
+package com.alom.androidstudy1
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.widget.Toast
+import androidx.lifecycle.ViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+class MemoViewModel : ViewModel(){
+    val _currentText = MutableStateFlow<String>("")
+    val currentText:StateFlow<String> = _currentText
+
+    fun returnMemo(context: Context){
+        val pref:SharedPreferences = context.getSharedPreferences("pref",Context.MODE_PRIVATE)
+        _currentText.value = pref.getString("content","")!!
+    }
+
+    fun saveMemo(content:String,context: Context){
+        _currentText.value = content
+
+        val pref:SharedPreferences = context.getSharedPreferences("pref",Context.MODE_PRIVATE)
+        pref.edit().putString("content",content).apply()
+
+        Toast.makeText(context,"메모가 저장되었습니다",Toast.LENGTH_LONG).show()
+    }
+}

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

@@ -7,13 +7,36 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:layout_margin="20dp"
+            android:text="메모장" />
+
+        <EditText
+            android:id="@+id/editTextTextMultiLine"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_margin="20dp"
+            android:layout_weight="1"
+            android:ems="10"
+            android:gravity="center|start"
+            android:inputType="textMultiLine"
+            android:text="edit text save" />
+
+        <Button
+            android:id="@+id/button"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:layout_margin="20dp"
+            android:text="저장" />
+    </LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

gradle/libs.versions.toml

@@ -6,12 +6,14 @@ junit = "4.13.2"
 junitVersion = "1.2.1"
 espressoCore = "3.6.1"
 appcompat = "1.7.0"
+lifecycleRuntimeKtx = "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 = "lifecycleRuntimeKtx" }
 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" }