stop watch logic

Question

I want to develop a simple stop watch logic in android.

On clicking a list view the timer should start and on clicking the button the timer should stop. Can anyone

Answer 1

As st0le gave an excellent example by using Stopwatch class. I modified this class a little and add a few methods to it.

/*
Copyright (c) 2005, Corey Goldberg

StopWatch.java is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

Modified: Bilal Rabbani bilalrabbani1@live.com (Nov 2013)
*/

package bilalrabbani1.at.live.com;

public class Stopwatch {
private long startTime = 0;
private boolean running = false;
private long currentTime = 0;

public void start() {
    this.startTime = System.currentTimeMillis();
    this.running = true;
}

public void stop() {
    this.running = false;
}

public void pause() {
    this.running = false;
    currentTime = System.currentTimeMillis() - startTime;
}
public void resume() {
    this.running = true;
    this.startTime = System.currentTimeMillis() - currentTime;
}

//elaspsed time in milliseconds
public long getElapsedTimeMili() {
    long elapsed = 0;
    if (running) {
         elapsed =((System.currentTimeMillis() - startTime)/100) % 1000 ;
    }
    return elapsed;
}

//elaspsed time in seconds
public long getElapsedTimeSecs() {
    long elapsed = 0;
    if (running) {
        elapsed = ((System.currentTimeMillis() - startTime) / 1000) % 60;
    }
    return elapsed;
}

  //elaspsed time in minutes
public long getElapsedTimeMin() {
    long elapsed = 0;
    if (running) {
        elapsed = (((System.currentTimeMillis() - startTime) / 1000) / 60 ) % 60;
    }
    return elapsed;
}

//elaspsed time in hours
public long getElapsedTimeHour() {
    long elapsed = 0;
    if (running) {
        elapsed = ((((System.currentTimeMillis() - startTime) / 1000) / 60 ) / 60);
    }
    return elapsed;
}

public String toString() {
    return getElapsedTimeHour() + ":" + getElapsedTimeMin() + ":"
            + getElapsedTimeSecs() + "." + getElapsedTimeMili();
}
}

Regards