From 24d4289ee6ca5be6a6b3d143623ce33b08cabab3 Mon Sep 17 00:00:00 2001
From: Kimeunseo <hyunice1226@gmail.com>
Date: Tue, 8 Jul 2025 02:33:44 +0900
Subject: [PATCH 1/5] start <-> pause

---
 .../bcsd_android_2025_1/MainActivity.kt       | 16 ++++
 app/src/main/res/layout/activity_main.xml     | 95 ++++++++++++++++++-
 app/src/main/res/layout/lap_list.xml          | 47 +++++++++
 3 files changed, 156 insertions(+), 2 deletions(-)
 create mode 100644 app/src/main/res/layout/lap_list.xml

diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
index 3ffa0eb..6e0ab88 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
@@ -1,14 +1,30 @@
 package com.example.bcsd_android_2025_1
 
 import android.os.Bundle
+import android.widget.Button
 import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 
 class MainActivity : AppCompatActivity() {
+
+    private lateinit var startButton: Button
+    private var isRunning = false
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        startButton = findViewById(R.id.main_button_start)
+
+        startButton.setOnClickListener {
+            isRunning = !isRunning
+            if (isRunning) {
+                startButton.text = "Pause"
+            } else {
+                startButton.text = "Start"
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 311f3cb..a1f9663 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -8,12 +8,103 @@
     tools:context=".MainActivity">
 
     <TextView
+        android:id="@+id/main_text_timer"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello Android!"
+        android:text="00 : 00 : 00"
+        android:textSize="36sp"
+        app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintVertical_bias="0.25" />
+
+    <Button
+        android:id="@+id/main_button_start"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Start"
+        android:layout_marginStart="50dp"
+        app:layout_constraintEnd_toStartOf="@id/main_button_stop"
+        app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.40"/>
+
+    <Button
+        android:id="@+id/main_button_stop"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Stop"
+        android:layout_marginStart="40dp"
+        android:layout_marginEnd="40dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toEndOf="@id/main_button_start"
+        app:layout_constraintEnd_toStartOf="@id/main_button_lap"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.40"/>
+
+    <Button
+        android:id="@+id/main_button_lap"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Lap"
+        android:layout_marginEnd="50dp"
+        app:layout_constraintStart_toEndOf="@id/main_button_stop"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.40"/>
+
+    <TextView
+        android:id="@+id/main_text_number"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Number"
+        android:textSize="15sp"
+        android:layout_marginStart="50dp"
+        app:layout_constraintEnd_toStartOf="@id/main_text_sectionRecord"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintVertical_bias="0.50" />
+
+    <TextView
+        android:id="@+id/main_text_sectionRecord"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Section record"
+        android:textSize="15sp"
+        android:layout_marginStart="40dp"
+        android:layout_marginEnd="40dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toEndOf="@id/main_text_number"
+        app:layout_constraintEnd_toStartOf="@id/main_text_totalTime"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.50" />
+
+    <TextView
+        android:id="@+id/main_text_totalTime"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Total time"
+        android:textSize="15sp"
+        android:layout_marginEnd="50dp"
+        app:layout_constraintStart_toEndOf="@id/main_text_sectionRecord"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.50" />
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/main_recycler_lap"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:padding="16dp"
+        app:layout_constraintTop_toBottomOf="@id/main_text_number"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/lap_list.xml b/app/src/main/res/layout/lap_list.xml
new file mode 100644
index 0000000..5e55773
--- /dev/null
+++ b/app/src/main/res/layout/lap_list.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/lap_list"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/lap_text_number"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="1"
+        android:textAlignment="center"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/lap_text_sectionRecord"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintVertical_bias="0.55"
+        app:layout_constraintHorizontal_weight="1" />
+
+    <TextView
+        android:id="@+id/lap_text_sectionRecord"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="00 : 00 : 00"
+        android:textAlignment="center"
+        app:layout_constraintStart_toEndOf="@id/lap_text_number"
+        app:layout_constraintEnd_toStartOf="@id/lap_text_totalTime"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintVertical_bias="0.55"
+        app:layout_constraintHorizontal_weight="1" />
+
+    <TextView
+        android:id="@+id/lap_text_totalTime"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="00 : 00 : 00"
+        android:textAlignment="center"
+        app:layout_constraintStart_toEndOf="@id/lap_text_sectionRecord"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintVertical_bias="0.55"
+        app:layout_constraintHorizontal_weight="1" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

From 9383d30f8e0125431405982d3875f4ca914358f9 Mon Sep 17 00:00:00 2001
From: Kimeunseo <hyunice1226@gmail.com>
Date: Tue, 8 Jul 2025 03:27:10 +0900
Subject: [PATCH 2/5] =?UTF-8?q?=ED=83=80=EC=9D=B4=EB=A8=B8=20=EA=B5=AC?=
 =?UTF-8?q?=ED=98=84=20(start=EB=A7=8C)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/build.gradle.kts                          |  3 ++
 .../bcsd_android_2025_1/MainActivity.kt       | 48 +++++++++++++++++--
 2 files changed, 47 insertions(+), 4 deletions(-)

diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 5791375..f9dc343 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -36,6 +36,9 @@ android {
 }
 
 dependencies {
+//coroutine
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
 
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.appcompat)
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
index 6e0ab88..65017bb 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
@@ -1,30 +1,70 @@
 package com.example.bcsd_android_2025_1
 
 import android.os.Bundle
+import android.os.SystemClock
 import android.widget.Button
+import android.widget.TextView
 import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 
 class MainActivity : AppCompatActivity() {
 
+    private lateinit var timerText: TextView
     private lateinit var startButton: Button
+
     private var isRunning = false
+    private var startTime = 0L // 시작시간
+    private var beforeTime = 0L // 누적시간
+    private var timerJob: Job? = null // 중단 위함
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
+        timerText = findViewById(R.id.main_text_timer)
         startButton = findViewById(R.id.main_button_start)
 
         startButton.setOnClickListener {
-            isRunning = !isRunning
-            if (isRunning) {
-                startButton.text = "Pause"
+            if (!isRunning) {
+                startTimer()
             } else {
-                startButton.text = "Start"
+                pauseTimer()
+            }
+        }
+    }
+
+    private fun startTimer() {
+        isRunning = true
+        startButton.text = "Pause"
+        startTime = SystemClock.elapsedRealtime() // 시작시점
+
+        timerJob = lifecycleScope.launch {
+            while (isRunning) {
+                val now = SystemClock.elapsedRealtime()
+                val totalTime = now - startTime + beforeTime  // 총 누적 시간 = 현재 시간 - 시작시간 + 이전누적시간
+                timerText.text = formatTime(totalTime)
+                delay(10)  // 10ms마다 갱신
             }
         }
     }
+
+    private fun pauseTimer() {
+        isRunning = false
+        beforeTime += SystemClock.elapsedRealtime() - startTime  // 이전 누적 시간에 이번에 흐른 시간 더함.
+        timerJob?.cancel()
+        startButton.text = "Start"
+    }
+
+    private fun formatTime(ms: Long): String {
+        val minutes = ms / 1000 / 60
+        val seconds = (ms / 1000) % 60
+        val millis = (ms % 1000) / 10
+        return String.format("%02d : %02d : %02d", minutes, seconds, millis)
+    }
 }
\ No newline at end of file

From c52fac4aead286397565f04db72922cfb0253b70 Mon Sep 17 00:00:00 2001
From: Kimeunseo <hyunice1226@gmail.com>
Date: Tue, 8 Jul 2025 04:29:34 +0900
Subject: [PATCH 3/5] =?UTF-8?q?=ED=83=80=EC=9D=B4=EB=A8=B8=20=EA=B5=AC?=
 =?UTF-8?q?=ED=98=84=20(stop)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../example/bcsd_android_2025_1/MainActivity.kt   | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
index 65017bb..a7dffb7 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
@@ -17,6 +17,7 @@ class MainActivity : AppCompatActivity() {
 
     private lateinit var timerText: TextView
     private lateinit var startButton: Button
+    private lateinit var stopButton: Button
 
     private var isRunning = false
     private var startTime = 0L // 시작시간
@@ -29,6 +30,7 @@ class MainActivity : AppCompatActivity() {
 
         timerText = findViewById(R.id.main_text_timer)
         startButton = findViewById(R.id.main_button_start)
+        stopButton = findViewById(R.id.main_button_stop)
 
         startButton.setOnClickListener {
             if (!isRunning) {
@@ -37,6 +39,10 @@ class MainActivity : AppCompatActivity() {
                 pauseTimer()
             }
         }
+
+        stopButton.setOnClickListener {
+            stopTimer()
+        }
     }
 
     private fun startTimer() {
@@ -67,4 +73,13 @@ class MainActivity : AppCompatActivity() {
         val millis = (ms % 1000) / 10
         return String.format("%02d : %02d : %02d", minutes, seconds, millis)
     }
+
+    private fun stopTimer() {
+        isRunning = false
+        timerJob?.cancel() // 코루틴 정지 + 기록 초기화
+        startTime = 0L
+        beforeTime = 0L
+        timerText.text = "00 : 00 : 00"
+        startButton.text = "Start"
+    }
 }
\ No newline at end of file

From b8b72aa0cc911b6f0a2096ce0ea7ad92a134c7aa Mon Sep 17 00:00:00 2001
From: Kimeunseo <hyunice1226@gmail.com>
Date: Tue, 8 Jul 2025 05:02:19 +0900
Subject: [PATCH 4/5] =?UTF-8?q?=ED=83=80=EC=9D=B4=EB=A8=B8=20=EA=B5=AC?=
 =?UTF-8?q?=ED=98=84=20(lap)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/src/main/AndroidManifest.xml              |  6 +++
 .../example/bcsd_android_2025_1/LapAdapter.kt | 35 ++++++++++++++++++
 .../example/bcsd_android_2025_1/LapData.kt    |  5 +++
 .../bcsd_android_2025_1/MainActivity.kt       | 37 +++++++++++++++++++
 app/src/main/res/layout/lap_list.xml          |  2 +-
 5 files changed, 84 insertions(+), 1 deletion(-)
 create mode 100644 app/src/main/java/com/example/bcsd_android_2025_1/LapAdapter.kt
 create mode 100644 app/src/main/java/com/example/bcsd_android_2025_1/LapData.kt

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 4c80941..35e153b 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,6 +12,12 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.BCSD_Android_20251"
         tools:targetApi="31">
+        <activity
+            android:name=".LapAdapter.kt"
+            android:exported="false" />
+        <activity
+            android:name=".LapData"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/LapAdapter.kt b/app/src/main/java/com/example/bcsd_android_2025_1/LapAdapter.kt
new file mode 100644
index 0000000..6abeb9a
--- /dev/null
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/LapAdapter.kt
@@ -0,0 +1,35 @@
+package com.example.bcsd_android_2025_1
+
+import LapData
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.RecyclerView
+
+class LapAdapter(private val lapList: List<LapData>) :
+    RecyclerView.Adapter<LapAdapter.LapViewHolder>() {
+
+    class LapViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        val number: TextView = view.findViewById(R.id.lap_text_number)
+        val section: TextView = view.findViewById(R.id.lap_text_sectionRecord)
+        val total: TextView = view.findViewById(R.id.lap_text_totalTime)
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): LapViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.lap_list, parent, false)
+        return LapViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: LapViewHolder, position: Int) {
+        val lap = lapList[position]
+        holder.number.text = lap.number.toString()
+        holder.section.text = lap.sectionTime
+        holder.total.text = lap.totalTime
+    }
+
+    override fun getItemCount() = lapList.size
+}
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/LapData.kt b/app/src/main/java/com/example/bcsd_android_2025_1/LapData.kt
new file mode 100644
index 0000000..647ebcc
--- /dev/null
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/LapData.kt
@@ -0,0 +1,5 @@
+data class LapData(
+    val number: Int,
+    val sectionTime: String,
+    val totalTime: String
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
index a7dffb7..b274b7d 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
@@ -1,5 +1,6 @@
 package com.example.bcsd_android_2025_1
 
+import LapData
 import android.os.Bundle
 import android.os.SystemClock
 import android.widget.Button
@@ -12,17 +13,24 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 
 class MainActivity : AppCompatActivity() {
 
     private lateinit var timerText: TextView
     private lateinit var startButton: Button
     private lateinit var stopButton: Button
+    private lateinit var lapButton: Button
+    private lateinit var lapRecyclerView: RecyclerView
+    private lateinit var lapAdapter: LapAdapter
+    private val lapList = mutableListOf<LapData>()
 
     private var isRunning = false
     private var startTime = 0L // 시작시간
     private var beforeTime = 0L // 누적시간
     private var timerJob: Job? = null // 중단 위함
+    private var lastLapTime = 0L // 마지막 기록된 시간
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -31,6 +39,12 @@ class MainActivity : AppCompatActivity() {
         timerText = findViewById(R.id.main_text_timer)
         startButton = findViewById(R.id.main_button_start)
         stopButton = findViewById(R.id.main_button_stop)
+        lapButton = findViewById(R.id.main_button_lap)
+        lapRecyclerView = findViewById(R.id.main_recycler_lap)
+
+        lapAdapter = LapAdapter(lapList)
+        lapRecyclerView.adapter = lapAdapter
+        lapRecyclerView.layoutManager = LinearLayoutManager(this)
 
         startButton.setOnClickListener {
             if (!isRunning) {
@@ -43,6 +57,25 @@ class MainActivity : AppCompatActivity() {
         stopButton.setOnClickListener {
             stopTimer()
         }
+
+        lapButton.setOnClickListener {
+            if (!isRunning) return@setOnClickListener
+
+            val now = SystemClock.elapsedRealtime()
+            val total = now - startTime + beforeTime
+            val section = if (lapList.isEmpty()) total else total - lastLapTime
+            lastLapTime = total
+
+            val lap = LapData(
+                number = lapList.size + 1,
+                sectionTime = formatTime(section),
+                totalTime = formatTime(total)
+            )
+
+            lapList.add(0, lap)
+            lapAdapter.notifyItemInserted(0)
+            lapRecyclerView.scrollToPosition(0)
+        }
     }
 
     private fun startTimer() {
@@ -79,7 +112,11 @@ class MainActivity : AppCompatActivity() {
         timerJob?.cancel() // 코루틴 정지 + 기록 초기화
         startTime = 0L
         beforeTime = 0L
+        lastLapTime = 0L
         timerText.text = "00 : 00 : 00"
         startButton.text = "Start"
+
+        lapList.clear()
+        lapAdapter.notifyDataSetChanged()
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/lap_list.xml b/app/src/main/res/layout/lap_list.xml
index 5e55773..ccca647 100644
--- a/app/src/main/res/layout/lap_list.xml
+++ b/app/src/main/res/layout/lap_list.xml
@@ -3,7 +3,7 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/lap_list"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="wrap_content">
 
     <TextView
         android:id="@+id/lap_text_number"

From cc061a053f9f227010e9dbfc18783d5d40fc0c05 Mon Sep 17 00:00:00 2001
From: Kimeunseo <hyunice1226@gmail.com>
Date: Tue, 8 Jul 2025 06:07:00 +0900
Subject: [PATCH 5/5] assignment_11

---
 app/build.gradle.kts                               |  4 ++--
 app/src/main/AndroidManifest.xml                   |  6 ------
 .../com/example/bcsd_android_2025_1/LapAdapter.kt  |  2 --
 .../example/bcsd_android_2025_1/MainActivity.kt    | 11 ++++-------
 app/src/main/res/layout/activity_main.xml          | 14 +++++++-------
 app/src/main/res/layout/lap_list.xml               |  6 +++---
 app/src/main/res/values/strings.xml                |  9 +++++++++
 7 files changed, 25 insertions(+), 27 deletions(-)

diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index f9dc343..d8fbcd4 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -37,8 +37,8 @@ android {
 
 dependencies {
 //coroutine
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3")
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.2")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.10.2")
 
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.appcompat)
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 35e153b..4c80941 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,12 +12,6 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.BCSD_Android_20251"
         tools:targetApi="31">
-        <activity
-            android:name=".LapAdapter.kt"
-            android:exported="false" />
-        <activity
-            android:name=".LapData"
-            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/LapAdapter.kt b/app/src/main/java/com/example/bcsd_android_2025_1/LapAdapter.kt
index 6abeb9a..e49b1ca 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/LapAdapter.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/LapAdapter.kt
@@ -1,12 +1,10 @@
 package com.example.bcsd_android_2025_1
 
 import LapData
-import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.TextView
-import androidx.appcompat.app.AppCompatActivity
 import androidx.recyclerview.widget.RecyclerView
 
 class LapAdapter(private val lapList: List<LapData>) :
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
index b274b7d..3aa9bd3 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt
@@ -5,14 +5,11 @@ import android.os.Bundle
 import android.os.SystemClock
 import android.widget.Button
 import android.widget.TextView
-import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.lifecycle.lifecycleScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
-import androidx.core.view.ViewCompat
-import androidx.core.view.WindowInsetsCompat
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 
@@ -80,7 +77,7 @@ class MainActivity : AppCompatActivity() {
 
     private fun startTimer() {
         isRunning = true
-        startButton.text = "Pause"
+        startButton.text = getString(R.string.main_pause)
         startTime = SystemClock.elapsedRealtime() // 시작시점
 
         timerJob = lifecycleScope.launch {
@@ -97,7 +94,7 @@ class MainActivity : AppCompatActivity() {
         isRunning = false
         beforeTime += SystemClock.elapsedRealtime() - startTime  // 이전 누적 시간에 이번에 흐른 시간 더함.
         timerJob?.cancel()
-        startButton.text = "Start"
+        startButton.text = getString(R.string.main_start)
     }
 
     private fun formatTime(ms: Long): String {
@@ -113,8 +110,8 @@ class MainActivity : AppCompatActivity() {
         startTime = 0L
         beforeTime = 0L
         lastLapTime = 0L
-        timerText.text = "00 : 00 : 00"
-        startButton.text = "Start"
+        timerText.text = getString(R.string.main_default_time)
+        startButton.text = getString(R.string.main_start)
 
         lapList.clear()
         lapAdapter.notifyDataSetChanged()
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index a1f9663..cce19e8 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -11,7 +11,7 @@
         android:id="@+id/main_text_timer"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="00 : 00 : 00"
+        android:text="@string/main_default_time"
         android:textSize="36sp"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintBottom_toBottomOf="parent"
@@ -23,7 +23,7 @@
         android:id="@+id/main_button_start"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Start"
+        android:text="@string/main_start"
         android:layout_marginStart="50dp"
         app:layout_constraintEnd_toStartOf="@id/main_button_stop"
         app:layout_constraintBottom_toBottomOf="parent"
@@ -35,7 +35,7 @@
         android:id="@+id/main_button_stop"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Stop"
+        android:text="@string/main_stop"
         android:layout_marginStart="40dp"
         android:layout_marginEnd="40dp"
         app:layout_constraintBottom_toBottomOf="parent"
@@ -48,7 +48,7 @@
         android:id="@+id/main_button_lap"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Lap"
+        android:text="@string/main_lap"
         android:layout_marginEnd="50dp"
         app:layout_constraintStart_toEndOf="@id/main_button_stop"
         app:layout_constraintBottom_toBottomOf="parent"
@@ -60,7 +60,7 @@
         android:id="@+id/main_text_number"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Number"
+        android:text="@string/main_number"
         android:textSize="15sp"
         android:layout_marginStart="50dp"
         app:layout_constraintEnd_toStartOf="@id/main_text_sectionRecord"
@@ -73,7 +73,7 @@
         android:id="@+id/main_text_sectionRecord"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Section record"
+        android:text="@string/main_section_record"
         android:textSize="15sp"
         android:layout_marginStart="40dp"
         android:layout_marginEnd="40dp"
@@ -87,7 +87,7 @@
         android:id="@+id/main_text_totalTime"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Total time"
+        android:text="@string/main_total_time"
         android:textSize="15sp"
         android:layout_marginEnd="50dp"
         app:layout_constraintStart_toEndOf="@id/main_text_sectionRecord"
diff --git a/app/src/main/res/layout/lap_list.xml b/app/src/main/res/layout/lap_list.xml
index ccca647..7c5f721 100644
--- a/app/src/main/res/layout/lap_list.xml
+++ b/app/src/main/res/layout/lap_list.xml
@@ -9,7 +9,7 @@
         android:id="@+id/lap_text_number"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:text="1"
+        android:text="@string/main_default_number"
         android:textAlignment="center"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toStartOf="@id/lap_text_sectionRecord"
@@ -22,7 +22,7 @@
         android:id="@+id/lap_text_sectionRecord"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:text="00 : 00 : 00"
+        android:text="@string/main_default_time"
         android:textAlignment="center"
         app:layout_constraintStart_toEndOf="@id/lap_text_number"
         app:layout_constraintEnd_toStartOf="@id/lap_text_totalTime"
@@ -35,7 +35,7 @@
         android:id="@+id/lap_text_totalTime"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:text="00 : 00 : 00"
+        android:text="@string/main_default_time"
         android:textAlignment="center"
         app:layout_constraintStart_toEndOf="@id/lap_text_sectionRecord"
         app:layout_constraintEnd_toEndOf="parent"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c6c4daf..522c889 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,12 @@
 <resources>
     <string name="app_name">BCSD_Android_2025-1</string>
+    <string name="main_default_time">00:00:00</string>
+    <string name="main_start">Start</string>
+    <string name="main_pause">Pause</string>
+    <string name="main_stop">Stop</string>
+    <string name="main_lap">Lap</string>
+    <string name="main_number">Number</string>
+    <string name="main_section_record">Section record</string>
+    <string name="main_total_time">Total time</string>
+    <string name="main_default_number">1</string>
 </resources>
\ No newline at end of file