[AndroidStudio] 실전 프로젝트 : 스톱워치

 

<MainActivity.kt>

package com.example.stopwatch

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.LinearLayout
import android.widget.TextView
import com.google.android.material.floatingactionbutton.FloatingActionButton
import org.w3c.dom.Text
import java.util.*
import kotlin.concurrent.timer

class MainActivity : AppCompatActivity() {

    private var time =0;
    private var timerTask: Timer? =null
    private var isRunning=false
    private var lap=1

    lateinit var fab : FloatingActionButton
    lateinit var secTextView : TextView
    lateinit var milliTextView : TextView
    lateinit var labLayout : LinearLayout
    lateinit var labButton: Button
    lateinit var resetFAB : FloatingActionButton

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        fab=findViewById<FloatingActionButton>(R.id.fab)
        secTextView=findViewById(R.id.secTextView)
        milliTextView=findViewById<TextView>(R.id.milliTextView)
        labLayout=findViewById<LinearLayout>(R.id.lapLayout)
        labButton=findViewById(R.id.lapButton)
        resetFAB =findViewById(R.id.resetFAB)

        fab.setOnClickListener{
            isRunning = !isRunning

            if(isRunning){
                start()
            } else{
                pause()
            }
        }

        labButton.setOnClickListener{
            recordLapTime()
        }

        resetFAB.setOnClickListener{
            reset()
        }
    }

    private fun start(){
        fab.setImageResource(R.drawable.ic_baseline_pause_24)

        timerTask =timer(period=10){
            time++
            val sec = time/100
            val milli=time % 100
            runOnUiThread{
                secTextView.text="$sec"
                milliTextView.text="$milli"
            }
        }
    }

    private fun pause() {
        fab.setImageResource(R.drawable.ic_baseline_pause_24)
        timerTask?.cancel()
    }

    private fun recordLapTime(){
        val lapTime = this.time
        val textView = TextView(this)
        textView.text="$lap LAB : ${lapTime/100}.${lapTime%100}"

        labLayout.addView(textView, 0)
        lap++
    }

    private fun reset(){
        timerTask?.cancel()

        time=0
        isRunning=false
        fab.setImageResource(R.drawable.ic_baseline_play_arrow_24)
        secTextView.text="0"
        milliTextView.text="00"

        labLayout.removeAllViews()
        lap=1
    }
}

 

<activity_main.xml>

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/secTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:text="0"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        android:textSize="100sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.100000024" />

    <TextView
        android:id="@+id/milliTextView"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_marginStart="12dp"
        android:layout_marginBottom="24dp"
        android:text="00"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        app:layout_constraintBottom_toBottomOf="@+id/secTextView"
        app:layout_constraintStart_toEndOf="@+id/secTextView" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:backgroundTint="@color/teal_700"
        android:clickable="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:srcCompat="@drawable/ic_baseline_play_arrow_24"
        app:tint="@color/white" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/resetFAB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginBottom="16dp"
        android:backgroundTint="#E91E63"
        android:clickable="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:srcCompat="@drawable/ic_baseline_refresh_24"
        app:tint="@color/white" />

    <Button
        android:id="@+id/lapButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        android:backgroundTint="#919191"
        android:text="랩타임"
        android:textColor="#1B1A1A"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

    <ScrollView
        android:id="@+id/scrollView2"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toTopOf="@+id/fab"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/secTextView"
        app:layout_constraintVertical_bias="0.0">

        <LinearLayout
            android:id="@+id/lapLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" />
    </ScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>

 

<실행결과>

타이머 동작 및 랩타임 기록

 

reset 버튼 클릭 시 초기화