[김상진_Android] 11주차 과제 제출

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

@@ -0,0 +1,3 @@
+package com.example.bcsd_android_2025_1
+
+data class ListData(val time : String)

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

@@ -1,14 +1,96 @@
 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 androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 
 class MainActivity : AppCompatActivity() {
+    private lateinit var timeTextView: TextView
+    private lateinit var startPauseButton:Button
+    private lateinit var stopButton:Button
+    private lateinit var lapButton:Button
+    private lateinit var recyclerViewAdapter: RecyclerViewAdapter
+    private lateinit var recyclerView:RecyclerView
+
+    private var isRunning = false
+    private var startTime = 0L
+    private var pauseOffset = 0L
+    private var timerJob: Job? = null
+
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        timeTextView = findViewById(R.id.time_textview)
+        startPauseButton = findViewById(R.id.start_pause_toggle_button)
+        stopButton = findViewById(R.id.stop_button)
+        lapButton = findViewById(R.id.lap_button)
+        recyclerView = findViewById(R.id.recycler_view)
+        recyclerViewAdapter = RecyclerViewAdapter()
+        recyclerView.adapter = recyclerViewAdapter
+        recyclerView.layoutManager = LinearLayoutManager(this)
+
+        startPauseButton.setOnClickListener {
+            if(!isRunning){
+                startPauseButton.text = getString(R.string.pause_text)
+                startTime = SystemClock.elapsedRealtime() - pauseOffset
+                startTimer()
+                isRunning=true
+            }else{
+                startPauseButton.text=getString(R.string.start_text)
+                pauseOffset = SystemClock.elapsedRealtime() - startTime
+                stopTimer()
+                isRunning=false
+            }
+        }
+
+        stopButton.setOnClickListener {
+            stopTimer()
+            timeTextView.text = getString(R.string.default_time_text)
+            startPauseButton.text = getString(R.string.start_text)
+            isRunning = false
+            pauseOffset = 0L
+            recyclerViewAdapter.removeAllItems()
+        }
+
+        lapButton.setOnClickListener {
+            if(isRunning){
+                val elapsed = SystemClock.elapsedRealtime() - startTime
+                val min = (elapsed / 1000) / 60
+                val sec = (elapsed / 1000) % 60
+                val mil = (elapsed % 1000) / 10
+                val nowTime = getString(R.string.time_text, min, sec, mil)
+
+                recyclerViewAdapter.addLapItem(nowTime)
+                recyclerView.scrollToPosition(0)
+            }
+        }
+    }
+
+    private fun startTimer(){
+        timerJob = lifecycleScope.launch{
+            while(true){
+                val elapsed = SystemClock.elapsedRealtime()-startTime
+                val min = (elapsed/1000)/60
+                val sec = (elapsed/1000)%60
+                val mil = (elapsed%1000)/10
+                timeTextView.text = getString(R.string.time_text, min, sec, mil)
+                delay(10L)
+            }
+        }
+    }
+
+    private fun stopTimer(){
+        timerJob?.cancel()
+        timerJob = null
     }
 }

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

@@ -0,0 +1,42 @@
+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 RecyclerViewAdapter:RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>(){
+    private val items = mutableListOf<ListData>()
+
+    inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        private val lapItemTextView: TextView = view.findViewById(R.id.lap_item_textview)
+
+        fun bind(item: ListData) {
+            lapItemTextView.text = item.time
+        }
+    }
+
+    fun addLapItem(time:String){
+        items.add(0, ListData(time))
+        notifyItemInserted(0)
+    }
+
+    fun removeAllItems(){
+        items.clear()
+        notifyDataSetChanged()
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val inflatedView = LayoutInflater.from(parent.context).inflate(R.layout.item_recyclerview, parent, false)
+        return ViewHolder(inflatedView)
+    }
+
+    override fun getItemCount(): Int{
+        return items.size
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        holder.bind(items[position])
+    }
+}

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

@@ -8,12 +8,59 @@
     tools:context=".MainActivity">
 
     <TextView
+        android:id="@+id/time_textview"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:gravity="center"
+        android:text="@string/default_time_text"
+        android:textSize="50sp"
+        app:layout_constraintVertical_bias="0.1"
+        android:textColor="@color/black"
+        android:textStyle="bold"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"/>
+
+    <Button
+        android:id="@+id/start_pause_toggle_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/start_text"
+        app:layout_constraintEnd_toStartOf="@id/stop_button"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="@id/stop_button"/>
+
+    <Button
+        android:id="@+id/stop_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/stop_text"
+        android:layout_marginTop="30dp"
+        app:layout_constraintTop_toBottomOf="@id/time_textview"
+        app:layout_constraintStart_toEndOf="@id/start_pause_toggle_button"
+        app:layout_constraintEnd_toStartOf="@id/lap_button"/>
+
+    <Button
+        android:id="@+id/lap_button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello Android!"
+        android:text="@string/lap_text"
+        app:layout_constraintTop_toTopOf="@id/stop_button"
+        app:layout_constraintStart_toEndOf="@id/stop_button"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/recycler_view"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginTop="20dp"
+        android:layout_marginStart="10dp"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/stop_button"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
+        tools:listitem="@layout/item_recyclerview"/>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/layout_item_recycler_view"
+    android:layout_marginBottom="5dp">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:id="@+id/lap_item_textview"
+        android:textSize="20sp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:textColor="@color/black"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -1,3 +1,9 @@
 <resources>
     <string name="app_name">BCSD_Android_2025-1</string>
+    <string name="start_text">START</string>
+    <string name="pause_text">PAUSE</string>
+    <string name="stop_text">STOP</string>
+    <string name="lap_text">LAP</string>
+    <string name="default_time_text">00:00:00</string>
+    <string name="time_text">%02d:%02d:%02d</string>
 </resources>