From 285428115e74d91019b28c3176b635e137e429ee Mon Sep 17 00:00:00 2001
From: yeran <ranijini42@gmail.com>
Date: Mon, 30 Jun 2025 21:40:21 +0900
Subject: [PATCH 1/5] assignment9

---
 .idea/.name                                   |   1 +
 .idea/compiler.xml                            |   6 +
 .idea/deploymentTargetSelector.xml            |  10 ++
 .idea/gradle.xml                              |   1 +
 .idea/kotlinc.xml                             |   6 +
 .idea/misc.xml                                |   3 +-
 .../bcsd_android_2025_1/MainActivity.kt       | 144 +++++++++++++++++-
 .../bcsd_android_2025_1/MusicAdapter.kt       |  39 +++++
 .../example/bcsd_android_2025_1/MusicItem.kt  |   7 +
 app/src/main/res/layout/activity_main.xml     | 140 +++++------------
 app/src/main/res/layout/item_music.xml        |  30 ++++
 app/src/main/res/values/strings.xml           |   8 +
 12 files changed, 283 insertions(+), 112 deletions(-)
 create mode 100644 .idea/.name
 create mode 100644 .idea/compiler.xml
 create mode 100644 .idea/deploymentTargetSelector.xml
 create mode 100644 .idea/kotlinc.xml
 create mode 100644 app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt
 create mode 100644 app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt
 create mode 100644 app/src/main/res/layout/item_music.xml

diff --git a/.idea/.name b/.idea/.name
new file mode 100644
index 0000000..c4e4683
--- /dev/null
+++ b/.idea/.name
@@ -0,0 +1 @@
+BCSD_Android_2025-1
\ No newline at end of file
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000..b86273d
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="21" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/deploymentTargetSelector.xml b/.idea/deploymentTargetSelector.xml
new file mode 100644
index 0000000..b268ef3
--- /dev/null
+++ b/.idea/deploymentTargetSelector.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetSelector">
+    <selectionStates>
+      <SelectionState runConfigName="app">
+        <option name="selectionMode" value="DROPDOWN" />
+      </SelectionState>
+    </selectionStates>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 97f0a8e..639c779 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml
new file mode 100644
index 0000000..c224ad5
--- /dev/null
+++ b/.idea/kotlinc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="KotlinJpsPluginSettings">
+    <option name="version" value="2.0.21" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 9027b72..b2c751a 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,7 +1,6 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_21">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
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..0b89cf3 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 +1,150 @@
 package com.example.bcsd_android_2025_1
 
+import android.Manifest
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.net.Uri
+import android.os.Build
 import android.os.Bundle
-import androidx.activity.enableEdgeToEdge
+import android.provider.MediaStore
+import android.view.View
+import android.widget.Button
+import android.widget.TextView
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.view.ViewCompat
-import androidx.core.view.WindowInsetsCompat
+import androidx.core.content.ContextCompat
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 
 class MainActivity : AppCompatActivity() {
+
+    private lateinit var recyclerView: RecyclerView
+    private lateinit var permissionMessage: TextView
+    private lateinit var openSettingsButton: Button
+    private lateinit var requestPermissionButton: Button
+
+    private lateinit var musicAdapter: MusicAdapter
+    private val musicList = mutableListOf<MusicData>()
+
+    private val permissionLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestPermission()
+    ) { isGranted ->
+        if (isGranted) {
+            showMusicList()
+        } else {
+            showPermissionUI()
+        }
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        recyclerView = findViewById(R.id.MusicRecyclerView)
+        permissionMessage = findViewById(R.id.text1)
+        openSettingsButton = findViewById(R.id.OpenButton)
+        requestPermissionButton = findViewById(R.id.RequestButton)
+
+        musicAdapter = MusicAdapter(musicList)
+        recyclerView.adapter = musicAdapter
+        recyclerView.layoutManager = LinearLayoutManager(this)
+
+        recyclerView.visibility = View.GONE
+        permissionMessage.visibility = View.GONE
+        openSettingsButton.visibility = View.GONE
+        requestPermissionButton.visibility = View.GONE
+
+        if (hasPermission()) {
+            showMusicList()
+        } else {
+            showPermissionUI()
+        }
+
+        openSettingsButton.setOnClickListener {
+            val intent = Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
+            val uri = Uri.fromParts("package", packageName, null)
+            intent.data = uri
+            startActivity(intent)
+        }
+
+        requestPermissionButton.setOnClickListener {
+            requestPermission()
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        if (hasPermission()) {
+            showMusicList()
+        }
+    }
+
+    private fun hasPermission(): Boolean {
+        val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            Manifest.permission.READ_MEDIA_AUDIO
+        } else {
+            Manifest.permission.READ_EXTERNAL_STORAGE
+        }
+        return ContextCompat.checkSelfPermission(this, permission) == PackageManager.PERMISSION_GRANTED
+    }
+
+    private fun requestPermission() {
+        val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            Manifest.permission.READ_MEDIA_AUDIO
+        } else {
+            Manifest.permission.READ_EXTERNAL_STORAGE
+        }
+        permissionLauncher.launch(permission)
+    }
+
+    private fun showPermissionUI() {
+        recyclerView.visibility = View.GONE
+        permissionMessage.visibility = View.VISIBLE
+        openSettingsButton.visibility = View.VISIBLE
+        requestPermissionButton.visibility = View.VISIBLE
+    }
+
+    private fun showMusicList() {
+        recyclerView.visibility = View.VISIBLE
+        permissionMessage.visibility = View.GONE
+        openSettingsButton.visibility = View.GONE
+        requestPermissionButton.visibility = View.GONE
+
+        loadMusicList()
+    }
+
+    private fun loadMusicList() {
+        musicList.clear()
+
+        val uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
+        val projection = arrayOf(
+            MediaStore.Audio.Media.TITLE,
+            MediaStore.Audio.Media.ARTIST,
+            MediaStore.Audio.Media.DURATION
+        )
+
+        val cursor = contentResolver.query(
+            uri,
+            projection,
+            MediaStore.Audio.Media.IS_MUSIC + "!=0",
+            null,
+            MediaStore.Audio.Media.TITLE + " ASC"
+        )
+
+        cursor?.use {
+            val titleIdx = it.getColumnIndex(MediaStore.Audio.Media.TITLE)
+            val artistIdx = it.getColumnIndex(MediaStore.Audio.Media.ARTIST)
+            val durationIdx = it.getColumnIndex(MediaStore.Audio.Media.DURATION)
+
+            while (it.moveToNext()) {
+                val title = if (titleIdx >= 0) it.getString(titleIdx) ?: "Unknown" else "Unknown"
+                val artist = if (artistIdx >= 0) it.getString(artistIdx) ?: "Unknown" else "Unknown"
+                val duration = if (durationIdx >= 0) it.getLong(durationIdx) else 0L
+
+                musicList.add(MusicData(title, artist, duration))
+            }
+        }
+
+        musicAdapter.notifyDataSetChanged()
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt
new file mode 100644
index 0000000..360a32e
--- /dev/null
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt
@@ -0,0 +1,39 @@
+package com.example.bcsd_android_2025_1
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+
+class MusicAdapter(private val musicList: List<MusicData>) :
+    RecyclerView.Adapter<MusicAdapter.MusicViewHolder>() {
+
+    class MusicViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        val titleText: TextView = view.findViewById(R.id.textTitle)
+        val artistText: TextView = view.findViewById(R.id.textArtist)
+        val durationText: TextView = view.findViewById(R.id.textDuration)
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MusicViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.item_music, parent, false)
+        return MusicViewHolder(view)
+    }
+
+    override fun getItemCount() = musicList.size
+
+    override fun onBindViewHolder(holder: MusicViewHolder, position: Int) {
+        val music = musicList[position]
+        holder.titleText.text = music.title
+        holder.artistText.text = music.artist
+        holder.durationText.text = formatDuration(music.duration)
+    }
+
+    private fun formatDuration(durationMs: Long): String {
+        val totalSeconds = durationMs / 1000
+        val minutes = totalSeconds / 60
+        val seconds = totalSeconds % 60
+        return String.format("%02d:%02d", minutes, seconds)
+    }
+}
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt
new file mode 100644
index 0000000..5d2837c
--- /dev/null
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt
@@ -0,0 +1,7 @@
+package com.example.bcsd_android_2025_1
+
+data class MusicItem(
+    val title: String,
+    val artist: String,
+    val duration: Long
+)
\ 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 1529c31..4d3250a 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,108 +1,36 @@
 <?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"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/main"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".MainActivity">
-
-    <TextView
-        android:id="@+id/text_login_title"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="로그인"
-        android:textSize="30sp"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        android:layout_marginTop="150dp"/>
-
-    <EditText
-        android:id="@+id/edit_login_title"
-        android:layout_width="0dp"
-        android:layout_height="wrap_content"
-        android:hint="아이디"
-        android:inputType="text"
-        app:layout_constraintTop_toBottomOf="@id/text_login_title"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        android:layout_marginTop="120dp"
-        android:layout_marginStart="30dp"
-        android:layout_marginEnd="30dp"/>
-
-    <EditText
-        android:id="@+id/edit_login_password"
-        android:layout_width="0dp"
-        android:layout_height="wrap_content"
-        android:hint="비밀번호"
-        android:inputType="text"
-        app:layout_constraintTop_toBottomOf="@id/edit_login_title"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        android:layout_marginTop="5dp"
-        android:layout_marginStart="30dp"
-        android:layout_marginEnd="30dp"/>
-
-    <Button
-        android:id="@+id/button_login"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="로그인"
-        android:backgroundTint="#462679"
-        app:layout_constraintTop_toBottomOf="@id/edit_login_password"
-        android:layout_marginTop="10dp"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent" />
-
-    <ImageView
-        android:id="@+id/img_login_naver"
-        android:layout_width="30dp"
-        android:layout_height="30dp"
-        android:src="@drawable/ic_logo_naver"
-        app:layout_constraintTop_toBottomOf="@id/button_login"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        android:layout_marginTop="5dp"/>
-
-    <ImageView
-        android:id="@+id/img_login_google"
-        android:layout_width="30dp"
-        android:layout_height="30dp"
-        android:src="@drawable/ic_logo_google"
-        app:layout_constraintTop_toBottomOf="@id/button_login"
-        app:layout_constraintEnd_toStartOf="@id/img_login_naver"
-        android:layout_marginEnd="10dp"
-        android:layout_marginTop="5dp"/>
-
-    <ImageView
-        android:id="@+id/img_login_kakao"
-        android:layout_width="30dp"
-        android:layout_height="30dp"
-        android:src="@drawable/ic_logo_kakao"
-        app:layout_constraintTop_toBottomOf="@id/button_login"
-        app:layout_constraintStart_toEndOf="@id/img_login_naver"
-        android:layout_marginStart="10dp"
-        android:layout_marginTop="5dp"/>
-
-    <TextView
-        android:id="@+id/tv_login_findpassword"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="비밀번호 찾기"
-        android:textSize="10dp"
-        app:layout_constraintTop_toBottomOf="@id/img_login_naver"
-        app:layout_constraintStart_toStartOf="@id/img_login_google"
-        android:layout_marginTop="10dp"/>
-
-    <TextView
-        android:id="@+id/text_login_signup"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="가입하기"
-        android:textSize="10dp"
-        app:layout_constraintTop_toBottomOf="@id/img_login_naver"
-        app:layout_constraintEnd_toEndOf="@id/img_login_kakao"
-        android:layout_marginTop="10dp"/>
-
-</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
+    android:layout_height="match_parent">
+
+    <RecyclerView
+        android:id="@+id/MusicRecyclerView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:gravity="center"
+        android:padding="16dp">
+
+        <TextView
+            android:id="@+id/text1"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/permission_needed" />
+
+        <Button
+            android:id="@+id/RequestButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/request_permission" />
+
+        <Button
+            android:id="@+id/OpenButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/open_settings" />
+    </LinearLayout>
+</FrameLayout>
diff --git a/app/src/main/res/layout/item_music.xml b/app/src/main/res/layout/item_music.xml
new file mode 100644
index 0000000..75468dc
--- /dev/null
+++ b/app/src/main/res/layout/item_music.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="12dp">
+
+    <TextView
+        android:id="@+id/textTitle"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/music_title"
+        android:textStyle="bold"
+        android:textSize="16sp" />
+
+    <TextView
+        android:id="@+id/textArtist"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/music_artist"
+        android:textSize="14sp" />
+
+    <TextView
+        android:id="@+id/textDuration"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/music_time"
+        android:textSize="14sp" />
+
+</LinearLayout>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c6c4daf..86c884a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,11 @@
 <resources>
     <string name="app_name">BCSD_Android_2025-1</string>
+    <string name="app_name">MusicApp</string>
+    <string name="permission_needed">권한이 필요합니다.</string>
+    <string name="request_permission">권한 요청</string>
+    <string name="open_settings">설정으로 이동</string>
+    <string name="music_title">제목</string>
+    <string name="music_artist">가수</string>
+    <string name="music_time">00:00</string>
+    </resources>
 </resources>
\ No newline at end of file

From 63b3af1f7c993cdbf60f0fa5839b194d7d890918 Mon Sep 17 00:00:00 2001
From: yeran <ranijini42@gmail.com>
Date: Mon, 30 Jun 2025 22:01:24 +0900
Subject: [PATCH 2/5] assignment9_modify

---
 app/src/main/res/values/strings.xml | 2 --
 1 file changed, 2 deletions(-)

diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 86c884a..61f1b95 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,11 +1,9 @@
 <resources>
     <string name="app_name">BCSD_Android_2025-1</string>
-    <string name="app_name">MusicApp</string>
     <string name="permission_needed">권한이 필요합니다.</string>
     <string name="request_permission">권한 요청</string>
     <string name="open_settings">설정으로 이동</string>
     <string name="music_title">제목</string>
     <string name="music_artist">가수</string>
     <string name="music_time">00:00</string>
-    </resources>
 </resources>
\ No newline at end of file

From 82a23b8dfd732dc1113d85aa2b9a2e1caae8ba94 Mon Sep 17 00:00:00 2001
From: yeran <ranijini42@gmail.com>
Date: Tue, 1 Jul 2025 00:49:50 +0900
Subject: [PATCH 3/5] assignment10

---
 .../bcsd_android_2025_1/MainActivity.kt       | 97 +++++++++++--------
 .../bcsd_android_2025_1/MusicAdapter.kt       | 21 ++--
 .../example/bcsd_android_2025_1/MusicItem.kt  |  9 +-
 .../bcsd_android_2025_1/MusicService.kt       | 63 ++++++++++++
 4 files changed, 142 insertions(+), 48 deletions(-)
 create mode 100644 app/src/main/java/com/example/bcsd_android_2025_1/MusicService.kt

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 0b89cf3..73708be 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
@@ -1,11 +1,9 @@
 package com.example.bcsd_android_2025_1
 
 import android.Manifest
-import android.content.Intent
-import android.content.pm.PackageManager
+import android.content.*
 import android.net.Uri
-import android.os.Build
-import android.os.Bundle
+import android.os.*
 import android.provider.MediaStore
 import android.view.View
 import android.widget.Button
@@ -16,23 +14,34 @@ import androidx.core.content.ContextCompat
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : AppCompatActivity(), MusicAdapter.OnItemClickListener {
 
     private lateinit var recyclerView: RecyclerView
     private lateinit var permissionMessage: TextView
     private lateinit var openSettingsButton: Button
     private lateinit var requestPermissionButton: Button
-
     private lateinit var musicAdapter: MusicAdapter
     private val musicList = mutableListOf<MusicData>()
 
+    private var musicService: MusicService? = null
+    private var isBound = false
+
     private val permissionLauncher = registerForActivityResult(
         ActivityResultContracts.RequestPermission()
-    ) { isGranted ->
-        if (isGranted) {
-            showMusicList()
-        } else {
-            showPermissionUI()
+    ) { granted ->
+        if (granted) showMusicList()
+        else showPermissionUI()
+    }
+
+    private val connection = object : ServiceConnection {
+        override fun onServiceConnected(name: ComponentName?, service: IBinder?) {
+            val binder = service as MusicService.MusicBinder
+            musicService = binder.getService()
+            isBound = true
+        }
+        override fun onServiceDisconnected(name: ComponentName?) {
+            musicService = null
+            isBound = false
         }
     }
 
@@ -45,7 +54,7 @@ class MainActivity : AppCompatActivity() {
         openSettingsButton = findViewById(R.id.OpenButton)
         requestPermissionButton = findViewById(R.id.RequestButton)
 
-        musicAdapter = MusicAdapter(musicList)
+        musicAdapter = MusicAdapter(musicList, this)
         recyclerView.adapter = musicAdapter
         recyclerView.layoutManager = LinearLayoutManager(this)
 
@@ -54,46 +63,50 @@ class MainActivity : AppCompatActivity() {
         openSettingsButton.visibility = View.GONE
         requestPermissionButton.visibility = View.GONE
 
-        if (hasPermission()) {
-            showMusicList()
-        } else {
-            showPermissionUI()
-        }
+        if (hasPermission()) showMusicList()
+        else showPermissionUI()
 
+        requestPermissionButton.setOnClickListener { requestPermission() }
         openSettingsButton.setOnClickListener {
             val intent = Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
             val uri = Uri.fromParts("package", packageName, null)
             intent.data = uri
             startActivity(intent)
         }
+    }
+
+    override fun onStart() {
+        super.onStart()
+        val intent = Intent(this, MusicService::class.java)
+        bindService(intent, connection, Context.BIND_AUTO_CREATE)
+    }
 
-        requestPermissionButton.setOnClickListener {
-            requestPermission()
+    override fun onStop() {
+        super.onStop()
+        if (isBound) {
+            unbindService(connection)
+            isBound = false
         }
     }
 
     override fun onResume() {
         super.onResume()
-        if (hasPermission()) {
-            showMusicList()
-        }
+        if (hasPermission()) showMusicList()
     }
 
     private fun hasPermission(): Boolean {
-        val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+        val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU)
             Manifest.permission.READ_MEDIA_AUDIO
-        } else {
+        else
             Manifest.permission.READ_EXTERNAL_STORAGE
-        }
         return ContextCompat.checkSelfPermission(this, permission) == PackageManager.PERMISSION_GRANTED
     }
 
     private fun requestPermission() {
-        val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+        val permission = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU)
             Manifest.permission.READ_MEDIA_AUDIO
-        } else {
+        else
             Manifest.permission.READ_EXTERNAL_STORAGE
-        }
         permissionLauncher.launch(permission)
     }
 
@@ -109,20 +122,18 @@ class MainActivity : AppCompatActivity() {
         permissionMessage.visibility = View.GONE
         openSettingsButton.visibility = View.GONE
         requestPermissionButton.visibility = View.GONE
-
         loadMusicList()
     }
 
     private fun loadMusicList() {
         musicList.clear()
-
         val uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
         val projection = arrayOf(
+            MediaStore.Audio.Media._ID,
             MediaStore.Audio.Media.TITLE,
             MediaStore.Audio.Media.ARTIST,
             MediaStore.Audio.Media.DURATION
         )
-
         val cursor = contentResolver.query(
             uri,
             projection,
@@ -130,21 +141,29 @@ class MainActivity : AppCompatActivity() {
             null,
             MediaStore.Audio.Media.TITLE + " ASC"
         )
-
         cursor?.use {
+            val idIdx = it.getColumnIndex(MediaStore.Audio.Media._ID)
             val titleIdx = it.getColumnIndex(MediaStore.Audio.Media.TITLE)
             val artistIdx = it.getColumnIndex(MediaStore.Audio.Media.ARTIST)
             val durationIdx = it.getColumnIndex(MediaStore.Audio.Media.DURATION)
-
             while (it.moveToNext()) {
-                val title = if (titleIdx >= 0) it.getString(titleIdx) ?: "Unknown" else "Unknown"
-                val artist = if (artistIdx >= 0) it.getString(artistIdx) ?: "Unknown" else "Unknown"
-                val duration = if (durationIdx >= 0) it.getLong(durationIdx) else 0L
-
-                musicList.add(MusicData(title, artist, duration))
+                val id = it.getLong(idIdx)
+                val title = it.getString(titleIdx) ?: "Unknown"
+                val artist = it.getString(artistIdx) ?: "Unknown"
+                val duration = it.getLong(durationIdx)
+                val contentUri = ContentUris.withAppendedId(uri, id)
+                musicList.add(MusicData(title, artist, duration, contentUri))
             }
         }
-
         musicAdapter.notifyDataSetChanged()
     }
+
+    override fun onItemClick(music: MusicData) {
+        val intent = Intent(this, MusicService::class.java).apply {
+            putExtra("music_uri", music.uri.toString())
+            putExtra("music_title", music.title)
+        }
+        ContextCompat.startForegroundService(this, intent)
+        if (isBound) musicService?.playMusic(music.uri, music.title)
+    }
 }
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt
index 360a32e..314800a 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MusicAdapter.kt
@@ -6,8 +6,14 @@ import android.view.ViewGroup
 import android.widget.TextView
 import androidx.recyclerview.widget.RecyclerView
 
-class MusicAdapter(private val musicList: List<MusicData>) :
-    RecyclerView.Adapter<MusicAdapter.MusicViewHolder>() {
+class MusicAdapter(
+    private val musicList: List<MusicData>,
+    private val listener: OnItemClickListener
+) : RecyclerView.Adapter<MusicAdapter.MusicViewHolder>() {
+
+    interface OnItemClickListener {
+        fun onItemClick(music: MusicData)
+    }
 
     class MusicViewHolder(view: View) : RecyclerView.ViewHolder(view) {
         val titleText: TextView = view.findViewById(R.id.textTitle)
@@ -28,12 +34,15 @@ class MusicAdapter(private val musicList: List<MusicData>) :
         holder.titleText.text = music.title
         holder.artistText.text = music.artist
         holder.durationText.text = formatDuration(music.duration)
+        holder.itemView.setOnClickListener {
+            listener.onItemClick(music)
+        }
     }
 
     private fun formatDuration(durationMs: Long): String {
-        val totalSeconds = durationMs / 1000
-        val minutes = totalSeconds / 60
-        val seconds = totalSeconds % 60
-        return String.format("%02d:%02d", minutes, seconds)
+        val totalSec = durationMs / 1000
+        val min = totalSec / 60
+        val sec = totalSec % 60
+        return String.format("%02d:%02d", min, sec)
     }
 }
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt
index 5d2837c..76495cf 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt
@@ -1,7 +1,10 @@
 package com.example.bcsd_android_2025_1
 
-data class MusicItem(
+import android.net.Uri
+
+data class MusicData(
     val title: String,
     val artist: String,
-    val duration: Long
-)
\ No newline at end of file
+    val duration: Long,
+    val uri: Uri
+)
diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MusicService.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MusicService.kt
new file mode 100644
index 0000000..6b0afcd
--- /dev/null
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MusicService.kt
@@ -0,0 +1,63 @@
+package com.example.bcsd_android_2025_1
+
+import android.app.*
+import android.content.Intent
+import android.media.MediaPlayer
+import android.net.Uri
+import android.os.Binder
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+
+class MusicService : Service() {
+
+    private val binder = MusicBinder()
+    private var mediaPlayer: MediaPlayer? = null
+
+    inner class MusicBinder : Binder() {
+        fun getService(): MusicService = this@MusicService
+    }
+
+    override fun onBind(intent: Intent?): IBinder = binder
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        val uriString = intent?.getStringExtra("music_uri")
+        val title = intent?.getStringExtra("music_title") ?: "재생 중"
+        if (uriString != null) {
+            playMusic(Uri.parse(uriString), title)
+        }
+        return START_NOT_STICKY
+    }
+
+    fun playMusic(uri: Uri, title: String) {
+        mediaPlayer?.release()
+        mediaPlayer = MediaPlayer.create(this, uri).apply {
+            setOnCompletionListener {
+                stopSelf()
+                stopForeground(STOP_FOREGROUND_REMOVE)
+            }
+            start()
+        }
+        showNotification(title)
+    }
+
+    private fun showNotification(title: String) {
+        val notifIntent = Intent(this, MainActivity::class.java)
+        val pendingIntent = PendingIntent.getActivity(
+            this, 0, notifIntent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+        )
+        val notification = NotificationCompat.Builder(this, "music_channel")
+            .setContentTitle("음악 재생")
+            .setContentText(title)
+            .setContentIntent(pendingIntent)
+            .setOngoing(true)
+            .build()
+        startForeground(1, notification)
+    }
+
+    override fun onDestroy() {
+        mediaPlayer?.release()
+        mediaPlayer = null
+        stopForeground(STOP_FOREGROUND_REMOVE)
+        super.onDestroy()
+    }
+}

From 4c8364ca989d24f0fc1040b9f2c65c93801b94ce Mon Sep 17 00:00:00 2001
From: yeran <ranijini42@gmail.com>
Date: Tue, 1 Jul 2025 01:14:44 +0900
Subject: [PATCH 4/5] assigment10

---
 app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt b/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt
index 76495cf..a455656 100644
--- a/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt
+++ b/app/src/main/java/com/example/bcsd_android_2025_1/MusicItem.kt
@@ -7,4 +7,4 @@ data class MusicData(
     val artist: String,
     val duration: Long,
     val uri: Uri
-)
+)
\ No newline at end of file

From 8b8f2254346453b5e86d800d3abdca51870ef285 Mon Sep 17 00:00:00 2001
From: yeran <ranijini42@gmail.com>
Date: Tue, 1 Jul 2025 01:48:24 +0900
Subject: [PATCH 5/5] ektl

---
 app/src/main/res/values/{strings.xml => string.xml} | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
 rename app/src/main/res/values/{strings.xml => string.xml} (83%)

diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/string.xml
similarity index 83%
rename from app/src/main/res/values/strings.xml
rename to app/src/main/res/values/string.xml
index 61f1b95..895f2be 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/string.xml
@@ -1,9 +1,9 @@
 <resources>
-    <string name="app_name">BCSD_Android_2025-1</string>
+    <string name="app_name">MusicApp</string>
     <string name="permission_needed">권한이 필요합니다.</string>
     <string name="request_permission">권한 요청</string>
     <string name="open_settings">설정으로 이동</string>
     <string name="music_title">제목</string>
     <string name="music_artist">가수</string>
     <string name="music_time">00:00</string>
-</resources>
\ No newline at end of file
+</resources>