[이건형_Android] 11주차 과제 제출

app/src/main/java/com/example/bcsd_android_2025_1/LapAdapter.kt

@@ -0,0 +1,41 @@
+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 LapAdapter : RecyclerView.Adapter<LapAdapter.LapViewHolder>() {
+
+    private val lapList = mutableListOf<LapItem>()
+
+    inner class LapViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        private val lapTextView: TextView = itemView.findViewById(R.id.text_lap)
+
+        fun bind(item: LapItem) {
+            lapTextView.text = item.time
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): LapViewHolder {
+        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_lap, parent, false)
+        return LapViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: LapViewHolder, position: Int) {
+        holder.bind(lapList[position])
+    }
+
+    override fun getItemCount(): Int = lapList.size
+
+    fun addLap(time: String) {
+        lapList.add(0, LapItem(time))
+        notifyItemInserted(0)
+    }
+
+    fun clear() {
+        lapList.clear()
+        notifyDataSetChanged()
+    }
+}

app/src/main/java/com/example/bcsd_android_2025_1/LapItem.kt

@@ -0,0 +1,5 @@
+package com.example.bcsd_android_2025_1
+
+data class LapItem(
+    val time: String
+)

app/src/main/java/com/example/bcsd_android_2025_1/MainActivity.kt

@@ -5,10 +5,95 @@ import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
+import android.os.Handler
+import android.os.Looper
+import android.widget.Button
+import android.widget.TextView
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 
 class MainActivity : AppCompatActivity() {
+
+    private lateinit var timerTextView: TextView
+    private lateinit var startPauseButton: Button
+    private lateinit var stopButton: Button
+
+    private lateinit var lapButton: Button
+    private lateinit var lapRecyclerView: RecyclerView
+    private lateinit var lapAdapter: LapAdapter
+
+    private var isRunning = false
+    private var startTime = 0L
+    private var pauseOffset = 0L
+    private val handler = Handler(Looper.getMainLooper())
+
+
+    private val updateRunnable = object : Runnable {
+        override fun run() {
+            val elapsed = System.currentTimeMillis() - startTime
+            val minutes = (elapsed / 1000) / 60
+            val seconds = (elapsed / 1000) % 60
+            val milliseconds = (elapsed % 1000) / 10
+
+            val timeString = getString(R.string.formatted_timer, minutes, seconds, milliseconds)
+            timerTextView.text = timeString
+
+            handler.postDelayed(this, 10)
+        }
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        timerTextView = findViewById(R.id.timer_textview)
+        startPauseButton = findViewById(R.id.start_pause_button)
+        stopButton = findViewById(R.id.stop_button)
+
+        val defaultTimeString = getString(R.string.default_timer_text)
+
+        startPauseButton.setOnClickListener {
+            if (!isRunning) {
+                startTime = System.currentTimeMillis() - pauseOffset
+                handler.post(updateRunnable)
+                isRunning = true
+                startPauseButton.text = getString(R.string.button_pause)
+            } else {
+                pauseOffset = System.currentTimeMillis() - startTime
+                handler.removeCallbacks(updateRunnable)
+                isRunning = false
+                startPauseButton.text = getString(R.string.button_start)
+            }
+        }
+
+        stopButton.setOnClickListener {
+            handler.removeCallbacks(updateRunnable)
+            isRunning = false
+            pauseOffset = 0L
+            timerTextView.text = getString(R.string.default_timer_text)
+            startPauseButton.text = getString(R.string.button_start)
+            lapAdapter.clear()
+        }
+
+        lapButton = findViewById(R.id.lap_button)
+        lapRecyclerView = findViewById(R.id.lap_recyclerview)
+        lapAdapter = LapAdapter()
+
+        lapRecyclerView.apply {
+            adapter = lapAdapter
+            layoutManager = LinearLayoutManager(this@MainActivity)
+        }
+
+        lapButton.setOnClickListener {
+            if (isRunning) {
+                val elapsed = System.currentTimeMillis() - startTime
+                val minutes = (elapsed / 1000) / 60
+                val seconds = (elapsed / 1000) % 60
+                val milliseconds = (elapsed % 1000) / 10
+
+                val lapTime = getString(R.string.formatted_timer, minutes, seconds, milliseconds)
+                lapAdapter.addLap(lapTime)
+                lapRecyclerView.scrollToPosition(0)
+            }
+        }
     }
 }

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

@@ -5,15 +5,65 @@
     android:id="@+id/main"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:padding="16dp"
     tools:context=".MainActivity">
 
     <TextView
-        android:layout_width="wrap_content"
+        android:id="@+id/timer_textview"
+        android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:text="Hello Android!"
-        app:layout_constraintBottom_toBottomOf="parent"
+        android:text="@string/default_timer_text"
+        android:textSize="48sp"
+        android:gravity="center"
+        android:textStyle="bold"
+        android:layout_marginTop="72dp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+    <Button
+        android:id="@+id/start_pause_button"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="@string/button_start"
+        android:layout_marginTop="64dp"
+        app:layout_constraintEnd_toStartOf="@id/stop_button"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/timer_textview"
+        android:layout_marginEnd="8dp"/>
+
+    <Button
+        android:id="@+id/stop_button"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="@string/button_stop"
+        android:layout_marginTop="64dp"
+        app:layout_constraintTop_toBottomOf="@id/timer_textview"
+        app:layout_constraintStart_toEndOf="@id/start_pause_button"
+        app:layout_constraintEnd_toStartOf="@id/lap_button"
+        android:layout_marginStart="8dp"
+        android:layout_marginEnd="8dp"/>
+
+    <Button
+        android:id="@+id/lap_button"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="@string/button_lap"
+        android:layout_marginTop="64dp"
+        app:layout_constraintTop_toBottomOf="@id/timer_textview"
+        app:layout_constraintStart_toEndOf="@id/stop_button"
         app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginStart="8dp"/>
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/lap_recyclerview"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginTop="24dp"
+        app:layout_constraintTop_toBottomOf="@id/start_pause_button"
+        app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintEnd_toEndOf="parent"
+        tools:listitem="@layout/item_lap" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/text_lap"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="12dp"
+    android:textColor="@android:color/holo_green_dark"
+    android:textSize="16sp" />

app/src/main/res/values/strings.xml

@@ -1,3 +1,9 @@
 <resources>
     <string name="app_name">BCSD_Android_2025-1</string>
+    <string name="button_start">Start</string>
+    <string name="button_pause">Pause</string>
+    <string name="button_stop">Stop</string>
+    <string name="button_lap">Lap</string>
+    <string name="default_timer_text">00 : 00 : 00</string>
+    <string name="formatted_timer">%1$02d : %2$02d : %3$02d</string>
 </resources>