[김영찬_Android] 11주차 과제 제출

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

@@ -0,0 +1,39 @@
+package com.example.bcsd_android_2025_1
+
+import android.view.LayoutInflater
+import android.view.View
+import android.widget.TextView
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+
+class LapAdapter : RecyclerView.Adapter<LapAdapter.LapViewHolder>() {
+
+    private val lapList = mutableListOf<LapItem>()
+
+    class LapViewHolder(View: View) : RecyclerView.ViewHolder(View) {
+        val lapText: TextView = View.findViewById(R.id.text_lap)
+    }
+
+    fun addLap(time: String) {
+        lapList.add(0, LapItem(time))
+        notifyItemInserted(0)
+    }
+
+    fun clearLaps() {
+        lapList.clear()
+        notifyDataSetChanged()
+    }
+
+    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.lapText.text = lapList[position].time
+    }
+
+    override fun getItemCount(): Int {
+        return lapList.size
+    }
+}

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

@@ -0,0 +1,3 @@
+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

@@ -1,14 +1,113 @@
 package com.example.bcsd_android_2025_1
 
 import android.os.Bundle
-import androidx.activity.enableEdgeToEdge
+import android.os.SystemClock
+import android.widget.Button
+import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.view.ViewCompat
-import androidx.core.view.WindowInsetsCompat
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 
 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 startTime = 0L
+    private var elapsedTime = 0L
+    private var isRunning = false
+    private var timeJob: Job? = null
+
+    private var coroutineScope = CoroutineScope(Dispatchers.Main)
+
+    private fun nowTime(ms: Long): String {
+        val minutes = (ms / 60000).toInt()
+        val seconds = ((ms % 60000) / 1000).toInt()
+        val millseconds = ((ms % 1000) / 10).toInt()
+        val timeString = getString(R.string.now_time, minutes, seconds, millseconds)
+        return timeString
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        timerTextView = findViewById(R.id.textview_timer)
+        startPauseButton = findViewById(R.id.button_start_pause)
+        stopButton = findViewById(R.id.button_stop)
+        lapButton = findViewById(R.id.button_lap)
+        lapRecyclerView = findViewById(R.id.lap_recyclerview)
+        lapAdapter = LapAdapter()
+
+        lapRecyclerView.adapter = lapAdapter
+        lapRecyclerView.layoutManager = LinearLayoutManager(this)
+
+        startPauseButton.setOnClickListener {
+            if (isRunning) {
+                pauseTimer()
+            } else {
+                startTimer()
+            }
+        }
+        stopButton.setOnClickListener {
+            stopTimer()
+        }
+        lapButton.setOnClickListener {
+            if (isRunning) {
+                val currentTime = SystemClock.elapsedRealtime() - startTime
+                val lapTime = nowTime(currentTime)
+
+                lapAdapter.addLap(lapTime)
+                lapRecyclerView.scrollToPosition(0)
+            }
+        }
+    }
+
+    private fun startTimer() {
+        startTime = SystemClock.elapsedRealtime() - elapsedTime
+        isRunning = true
+        startPauseButton.text = getString(R.string.text_pause)
+
+        timeJob = coroutineScope.launch {
+            while (isActive) {
+                val elapsed = SystemClock.elapsedRealtime() - startTime
+                timerTextView.text = nowTime(elapsed)
+                delay(10L)
+            }
+        }
+    }
+
+    private fun pauseTimer() {
+        elapsedTime = SystemClock.elapsedRealtime() - startTime
+        timeJob?.cancel()
+        isRunning = false
+        startPauseButton.text = getString(R.string.text_start)
+    }
+
+    private fun stopTimer() {
+        timeJob?.cancel()
+        startTime = 0L
+        elapsedTime = 0L
+        isRunning = false
+        timerTextView.text = getString(R.string.start_time)
+        startPauseButton.text = getString(R.string.text_start)
+        lapAdapter.clearLaps()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        timeJob?.cancel()
+        coroutineScope.cancel()
     }
 }

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

@@ -1,19 +1,62 @@
 <?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"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    android:padding="16dp">
 
     <TextView
-        android:layout_width="wrap_content"
+        android:id="@+id/textview_timer"
+        android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:text="Hello Android!"
-        app:layout_constraintBottom_toBottomOf="parent"
+        android:text="@string/start_time"
+        android:textSize="36sp"
+        android:textStyle="bold"
+        android:gravity="center"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/button_start_pause"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginTop="50dp"/>
+
+    <Button
+        android:id="@+id/button_start_pause"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="@string/text_start"
+        app:layout_constraintTop_toBottomOf="@id/textview_timer"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/button_stop"
+        android:layout_marginEnd="8dp"
+        android:layout_marginTop="50dp"/>
+
+    <Button
+        android:id="@+id/button_stop"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="@string/text_stop"
+        app:layout_constraintTop_toTopOf="@id/button_start_pause"
+        app:layout_constraintStart_toEndOf="@id/button_start_pause"
+        app:layout_constraintEnd_toStartOf="@id/button_lap"
+        android:layout_marginEnd="8dp"/>
+
+    <Button
+        android:id="@+id/button_lap"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:text="@string/text_lap"
+        app:layout_constraintTop_toTopOf="@id/button_stop"
+        app:layout_constraintStart_toEndOf="@id/button_stop"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/lap_recyclerview"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintTop_toBottomOf="@id/button_lap"
+        app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginTop="30dp"/>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,9 @@
+<?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:textSize="18sp"
+    android:textColor="@color/green"
+    />

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

@@ -2,4 +2,5 @@
 <resources>
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
+    <color name="green">#00AA00</color>
 </resources>

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

@@ -1,3 +1,9 @@
 <resources>
     <string name="app_name">BCSD_Android_2025-1</string>
+    <string name="start_time">00 : 00 : 00</string>
+    <string name="now_time">%02d : %02d :%02d</string>
+    <string name="text_pause">Pause</string>
+    <string name="text_start">Start</string>
+    <string name="text_stop">Stop</string>
+    <string name="text_lap">Lap</string>
 </resources>