[김예란_Android] 6주차 과제 제출 #6

kongwoojin · 2025-11-25T02:35:15Z

private 처리를 해도 좋을 것 같아요

kongwoojin · 2025-11-25T02:35:36Z

확장함수를 사용헀다면 더 좋을 것 같아요

kongwoojin · 2025-11-25T02:35:52Z

Locale이 US인 이유가 있나요?

kongwoojin · 2025-11-25T02:39:56Z

Coroutine에서 delay를 10ms만큼 준다고 실제 10ms만큼만 delay가 생기지 않습니다.
예를 들어, delay(1000)에 대해 전후에 System.currentTimeMillis()를 로그로 찍어보면, 실제로 1000ms만큼 차이가 나는 것이 아니라 오차가 발생하는 것을 확인할 수 있습니다.
왜 이런 현상이 발생하는지도 알아보시면 좋을 것 같아요.

kongwoojin · 2025-11-25T02:40:49Z

0번 인덱스에 추가하는 방법도 좋은 방법이지만, recyclerview 자체를 반대로 뒤집을 수도 있어요

-Original file line number
+Diff line change
@@ Expand Up / @@ -45,4 +45,6 @@ dependencies { @@
         testImplementation(libs.junit)
         androidTestImplementation(libs.androidx.junit)
         androidTestImplementation(libs.androidx.espresso.core)
+        val fragment_version = "1.8.9"
+        implementation("androidx.fragment:fragment-ktx:$fragment_version")
     }

-Original file line number
+Diff line change
@@ -0,0 +1,26 @@
+    package com.example.android_25_2
+    import android.view.LayoutInflater
+    import android.view.View
+    import android.view.ViewGroup
+    import android.widget.TextView
+    import androidx.recyclerview.widget.RecyclerView
+    class LapAdapter (private val lapList: MutableList<String>): RecyclerView.Adapter<RecyclerView.ViewHolder>(){
+        class ViewHolder(view: View) : RecyclerView.ViewHolder(view){
+        }
+        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
+            val view = LayoutInflater.from(parent.context).inflate(R.layout.item, parent, false)
+            return ViewHolder(view)
+        }
+        override fun getItemCount(): Int {
+            return lapList.size
+        }
+        override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
+            val lapTime = lapList[position]
+            val textViewRecord: TextView = holder.itemView.findViewById(R.id.textView_record)
+            textViewRecord.text = lapTime
+        }
+    }

-Original file line number
+Diff line change
@@ -1,12 +1,31 @@
     package com.example.android_25_2
     import android.os.Bundle
+    import android.widget.Button
+    import android.widget.TextView
     import androidx.activity.enableEdgeToEdge
     import androidx.appcompat.app.AppCompatActivity
     import androidx.core.view.ViewCompat
     import androidx.core.view.WindowInsetsCompat
+    import androidx.lifecycle.lifecycleScope
+    import androidx.recyclerview.widget.LinearLayoutManager
+    import androidx.recyclerview.widget.RecyclerView
+    import kotlinx.coroutines.Job
+    import kotlinx.coroutines.delay
+    import kotlinx.coroutines.launch
+    import java.util.Locale
+    import java.util.Timer
     class MainActivity : AppCompatActivity() {
+        var time = 0
+        var isRunning = false
+        var lapList = mutableListOf<String>()
+        var timerJob: Job? = null
+        var timerTask: Timer? = null
+        var lapAdapter = LapAdapter(lapList)
         override fun onCreate(savedInstanceState: Bundle?) {
             super.onCreate(savedInstanceState)
             enableEdgeToEdge()
@@ Expand All / @@ -16,5 +35,64 @@ class MainActivity : AppCompatActivity() { @@
                 v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
                 insets
             }
+            val textViewTime = findViewById<TextView>(R.id.textView_time)
+            val recyclerView = findViewById<RecyclerView>(R.id.recyclerView)
+            val buttonStartOrPause = findViewById<Button>(R.id.button_start_or_pause)
+            val buttonStop = findViewById<Button>(R.id.button_stop)
+            val buttonLap = findViewById<Button>(R.id.button_lap)
+            lapAdapter = LapAdapter(lapList)
+            recyclerView.layoutManager = LinearLayoutManager(this)
+            recyclerView.adapter = lapAdapter
+            textViewTime.text = "00:00:00"
+            fun formatTime(millis: Int): String {
+                val minutes = ((millis % 3600000) / 60000)
+                val seconds = ((millis % 60000) / 1000)
+                val ms = ((millis % 1000) / 10)
+                return String.format(Locale.US, "%02d:%02d:%02d", minutes, seconds, ms)
+            }
+            fun start() {
+                isRunning = true
+                timerJob = lifecycleScope.launch {
+                    while (isRunning) {
+                        delay(10)
+                        time += 10
+                        textViewTime.text = formatTime(time)
+                    }
+                }
+            }
+            fun pause() {
+                isRunning = false
+                timerJob?.cancel()
+            }
+            fun stopTimer() {
+                isRunning = false
+                timerJob?.cancel()
+                time = 0
+                textViewTime.text = "00:00:00"
+            }
+            buttonStartOrPause.setOnClickListener {
+                if (isRunning) pause()
+                else start()
+            }
+            buttonStop.setOnClickListener {
+                stopTimer()
+                lapList.clear()
+                lapAdapter.notifyDataSetChanged()
+                isRunning = false
+            }
+            buttonLap.setOnClickListener{
+                val currentTime = textViewTime.text.toString()
+                lapList.add(0, currentTime)
+                lapAdapter.notifyItemInserted(0)
+                recyclerView.scrollToPosition(0)
+            }
         }
     }

-Original file line number
+Diff line change
@@ Expand Up / @@ -7,4 +7,58 @@ @@
         android:layout_height="match_parent"
         tools:context=".MainActivity">
+        <TextView
+            android:id="@+id/textView_time"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textSize="30sp"
+            android:textStyle="bold"
+            app:layout_constraintTop_toTopOf="parent"
+            android:layout_marginTop="180dp"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"/>
+        <Button
+            android:id="@+id/button_start_or_pause"
+            android:layout_width="100dp"
+            android:layout_height="60dp"
+            android:text="@string/button_text_start_or_pause"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/textView_time"
+            app:layout_constraintEnd_toStartOf="@id/button_stop"
+            android:layout_marginTop="80dp"
+            android:layout_marginStart="25dp"/>
+        <Button
+            android:id="@+id/button_stop"
+            android:layout_width="100dp"
+            android:layout_height="60dp"
+            android:text="@string/button_text_stop"
+            app:layout_constraintTop_toBottomOf="@id/textView_time"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            android:layout_marginHorizontal="25dp"
+            android:layout_marginTop="80dp"/>
+        <Button
+            android:id="@+id/button_lap"
+            android:layout_width="100dp"
+            android:layout_height="60dp"
+            android:text="@string/button_text_lap"
+            app:layout_constraintTop_toBottomOf="@id/textView_time"
+            app:layout_constraintStart_toEndOf="@id/button_stop"
+            android:layout_marginTop="80dp"
+            android:layout_marginHorizontal="25dp"/>
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/recyclerView"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            app:layout_constraintTop_toBottomOf="@id/button_stop"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            android:layout_marginTop="30dp"
+            android:background="@color/gray" />
     </androidx.constraintlayout.widget.ConstraintLayout>

-Original file line number
+Diff line change
@@ -0,0 +1,21 @@
+    <?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="50dp"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:background="@color/white">
+        <TextView
+            android:id="@+id/textView_record"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:textSize="20sp"
+            android:textStyle="bold"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            android:layout_marginTop="13dp"
+            android:layout_marginHorizontal="15dp"/>
+    </androidx.constraintlayout.widget.ConstraintLayout>

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[김예란_Android] 6주차 과제 제출 #6

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kongwoojin Nov 25, 2025

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-Original file line number
+Diff line change
@@ Expand Up / @@ -2,12 +2,12 @@ @@
         <!-- Base application theme. -->
         <style name="Theme.Android_252" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
             <!-- Primary brand color. -->
-            <item name="colorPrimary">@color/purple_200</item>
-            <item name="colorPrimaryVariant">@color/purple_700</item>
+            <item name="colorPrimary">@color/purple</item>
+            <item name="colorPrimaryVariant">@color/purple</item>
             <item name="colorOnPrimary">@color/black</item>
             <!-- Secondary brand color. -->
-            <item name="colorSecondary">@color/teal_200</item>
-            <item name="colorSecondaryVariant">@color/teal_200</item>
+            <item name="colorSecondary">@color/gray</item>
+            <item name="colorSecondaryVariant">@color/gray</item>
             <item name="colorOnSecondary">@color/black</item>
             <!-- Status bar color. -->
             <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
@@ Expand Down @@

-Original file line number
+Diff line change
@@ -1,10 +1,7 @@
     <?xml version="1.0" encoding="utf-8"?>
     <resources>
-        <color name="purple_200">#FFBB86FC</color>
-        <color name="purple_500">#FF6200EE</color>
-        <color name="purple_700">#FF3700B3</color>
-        <color name="teal_200">#FF03DAC5</color>
-        <color name="teal_700">#FF018786</color>
+        <color name="purple">#FF6200EE</color>
         <color name="black">#FF000000</color>
         <color name="white">#FFFFFFFF</color>
+        <color name="gray">#F1F3F5</color>
     </resources>

-Original file line number
+Diff line change
@@ -1,3 +1,6 @@
     <resources>
         <string name="app_name">Android_25-2</string>
+        <string name="button_text_start_or_pause">Start/Pause</string>
+        <string name="button_text_stop">Stop</string>
+        <string name="button_text_lap">Lap</string>
     </resources>

-Original file line number
+Diff line change
@@ Expand Up / @@ -9,6 +9,7 @@ appcompat = "1.7.1" @@
     material = "1.12.0"
     activity = "1.11.0"
     constraintlayout = "2.2.1"
+    fragment_version = "1.8.9"
     [libraries]
     androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ Expand Down @@

[김예란_Android] 6주차 과제 제출 #6

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