android - androidL how to reset a timer -


i learning use timer, , follow example in http://examples.javacodegeeks.com/android/core/os/handler/android-timer-example/.

i implement in way timer start off when user pressing button , stop when user's hand off, have coded follows:

codes:

button_right.setontouchlistener( new view.ontouchlistener()  {     @override     public boolean ontouch(view arg0, motionevent event)      {         if(event.getaction()==motionevent.action_down )         {             starttime = systemclock.uptimemillis();             customhandler.postdelayed(updatetimerthread, 0);            if((event.getaction()==motionevent.action_up || event.getaction()==motionevent.action_cancel))         {             timeswapbuff += timeinmilliseconds;             customhandler.removecallbacks(updatetimerthread);         }         return false;     } });      // setting timer private runnable updatetimerthread = new runnable()  {     public void run()      {         timeinmilliseconds = systemclock.uptimemillis() - starttime;         updatedtime = timeswapbuff + timeinmilliseconds;          int secs = (int) (updatedtime / 1000);         int mins = secs / 60;         secs = secs % 60;         int milliseconds = (int) (updatedtime % 1000);         tv_timing.settext("" + mins + ":" + string.format("%02d", secs) + ":" + string.format("%03d", milliseconds));         customhandler.postdelayed(this, 0);     } };

questions:

everything works fine, , timer start when user presses button, keep running when holding , stop when hand off. yet discover when user presses button again, timer start off stops last time instead of resetting 0 before counting time.

if using code, how modified such timer reset 0 count on again when button being pressed again? thanks!!

digging further details in code , researching further through web, found answer , modify code follows , works.

all in all, monica introducing chronometer, seems nice! , zyoo sparkling me make removecallbacks under action_down

            if(event.getaction()==motionevent.action_down )             {                 if(starttime == 0l)                 {                     starttime = systemclock.uptimemillis();                     customhandler.removecallbacks(updatetimerthread);                     customhandler.postdelayed(updatetimerthread, 0);                 }              if((event.getaction()==motionevent.action_up || event.getaction()==motionevent.action_cancel))             {                 // timeswapbuff += timeinmilliseconds; //remove this!                  customhandler.removecallbacks(updatetimerthread);                 starttime = 0l;             }             return false;   private runnable updatetimerthread = new runnable()  {     public void run()      {         timeinmilliseconds = systemclock.uptimemillis() - starttime;         //updatedtime = timeswapbuff + timeinmilliseconds;  //remove this!! else starting stops last time!          int secs = (int) (timeinmilliseconds / 1000);         int mins = secs / 60;         secs = secs % 60;         int milliseconds = (int) (timeinmilliseconds % 1000);         tv_timing.settext("" + mins + ":" + string.format("%02d", secs) + ":" + string.format("%03d", milliseconds));         customhandler.postdelayed(this, 0);     } };

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