Format Stopwatch to display 00:00

问题

I am experimenting with using a stopwatch in one of my apps and I have got it to where it will start counting seconds on start and stop counting on stop. My problem is that it will keep going on after 60 seconds. For example I get 120 seconds if I waited for two minutes.

So my question is how can I make it so once the seconds reached 60 the minutes would be increased by one and the seconds would start over?

So instead of :120 I would get 2:00. Here is the code I have:

final int MSG_START_TIMER = 0;
final int MSG_STOP_TIMER = 1;
final int MSG_UPDATE_TIMER = 2;

Stopwatch timer = new Stopwatch();
final int REFRESH_RATE = 100;

Handler mHandler = new Handler()
{
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        switch (msg.what) {
        case MSG_START_TIMER:
            timer.start(); 
            mHandler.sendEmptyMessage(MSG_UPDATE_TIMER);
            break;

        case MSG_UPDATE_TIMER:              
            tvTextView.setText(":"+ timer.getElapsedTimeSecs());                
            mHandler.sendEmptyMessageDelayed(MSG_UPDATE_TIMER,REFRESH_RATE); 
            break;                                  
        case MSG_STOP_TIMER:
            mHandler.removeMessages(MSG_UPDATE_TIMER); 
            timer.stop();
            tvTextView.setText("");
            break;

        default:
            break;
        }
    }
};

Also are:

 public void start(View v) {
    mHandler.sendEmptyMessage(MSG_START_TIMER);
}

public void stop(View v) {
    mHandler.sendEmptyMessage(MSG_STOP_TIMER);
}

By the way I looked at this question but his issue was with TimeSpan and if I understand correctly that is different from Stopwatch(correct me if I am wrong). Thanks for your time and effort.

回答1:

If you start with the time in seconds:

display = String.format("%d:%02d", seconds / 60, seconds % 60);

If you don't want the minutes if they are 0:

if (seconds < 60)
    display = String.format("%02d", seconds);
else
    display = String.format("%d:%02d", seconds / 60, seconds % 60);

回答2:

You are just going to have to make a function that creates a string for you. Stash this somewhere reachable.

    public String NumToStr(long i){
        if (i < 10 ) {
            return ("0" + Long.toString(i));
        }
        return Long.toString(i);
    }

this will take any number that is less than 10 and give you a string with a "0" infront of the number.

i.e. send it a 7 and get "07" then send it a 55 and get "55" because it was not less than 10. Finaly send it the seconds 5 and get "05". Now add the strings together,

    Hour + ":" + Minute + ":" + Seconds;

and you will get "07:55:05"

next just put in a

    if (seconds > 60) {
        seconds = 0
        minutes++; 
    }
    if (minutes > 60) {
        minutes = 0
        hours++;
    }
    if (hours > 12) {
        hours = 0
    }

With all respect this is basic stuff.

In response to where should you put all of this? Where ever you like. But you need to redo some of your code.

     case MSG_UPDATE_TIMER:
        long TimePassed;
        TimePassed = Seconds;
        if (Minutes > 0) {
            TimePassed = TimePassed  + (60 * Minutes);
        }
        if (Hours > 0) {
            TimePassed = TimePassed + (60 * 60 * Hours);
        }

        Seconds =  (timer.getElapsedTimeSecs()- TimePassed );

        if (Seconds > 60) {
            Seconds = 0
            Minutes++; 
        }
        if (Minutes > 60) {
            Minutes = 0
            hours++;
        }
        String timeSecs = NumToStr(Seconds);
        String timeMins = NumToStr(Minutes);
        String timeHours = NumToStr(Hours);

        String Time = timeHours + ":" + timeMins + ":" + timeSecs; 

        tvTextView.setText(Time);   

        mHandler.sendEmptyMessageDelayed(MSG_UPDATE_TIMER,REFRESH_RATE); 
        break;

来源：https://stackoverflow.com/questions/11918729/format-stopwatch-to-display-0000

标签

java

android

stopwatch