[안드로이드]스톱워치(StopWatch) 만들어보기

 

2020/12/01 - [안드로이드] - [안드로이드]타이머 구현하기 countDownTimer 시,분,초

 

이번시간에는 스톱워치를 만들어보겠습니다. 화면은 단순합니다. 

시간을 보여주는 부분은 Chromometer를 사용하며, 

버튼은 3개가 필요한데, 시작버튼, 정지버튼, 초기화 버튼이 있습니다. 

 

1. 화면구현(activity_main.xml)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Chronometer
        android:id="@+id/chronometer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:layout_gravity="center_horizontal"
        android:textSize="30sp"/>

    <Button
        android:id="@+id/start_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_gravity="center_horizontal"
        android:text="시작" />

    <Button
        android:id="@+id/stop_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_gravity="center_horizontal"
        android:text="정지" />

    <Button
        android:id="@+id/reset_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_gravity="center_horizontal"
        android:text="초기화" />


</LinearLayout>

 

2. 기능구현(MainActivity.java)

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;

public class MainActivity extends AppCompatActivity {

    private Chronometer chronometer;
    private boolean running;
    private long pauseOffset;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        chronometer = findViewById(R.id.chronometer);
        chronometer.setFormat("시간: %s");

        Button startBtn = findViewById(R.id.start_btn);
        Button stopBtn = findViewById(R.id.stop_btn);
        Button resetBtn = findViewById(R.id.reset_btn);

        //시작
        startBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(!running){
                    chronometer.setBase(SystemClock.elapsedRealtime() - pauseOffset);
                    chronometer.start();
                    running = true;
                }
            }
        });
        //중지
        stopBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(running){
                    chronometer.stop();
                    pauseOffset = SystemClock.elapsedRealtime() - chronometer.getBase();
                    running = false;
                }
            }
        });

        //초기화
        resetBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                chronometer.setBase(SystemClock.elapsedRealtime());
                pauseOffset = 0;
                chronometer.stop();
                running = false;
            }
        });

    }
}

 

3. 실행화면