android - Creating a timer in a Canvas- multithreading -

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this code, when app started saw black screen. wanted app add time counter, think multithreading has problems.

        timecounter.startcount();         while(pressed!=true){             if (!holder.getsurface().isvalid())                  continue;             canvas c= holder.lockcanvas();             c.drawbitmap(galaxy, 30, 0, null);             c.drawbitmap(player, x-(player.getwidth()/2), y-(player.getheight()/2), null);             c.drawtext(timecounter.tostring(), 30, 60, timerpaint);             holder.unlockcanvasandpost(c);         }     }

the timers class(im not sure thread ok):

public class timecounter {     private int smallestseconds=0;     private int seconds=0;     private int minute=0;     public timecounter()     {         smallestseconds=0;         seconds=0;         minute=0;     }     public void startcount()     {         thread t=new thread();         while(pressed!=true)         {             try{                 t.sleep(10);             }catch(interruptedexception e){                 smallestseconds++;                 if(smallestseconds==100)                 {                     smallestseconds=0;                     seconds++;                     if(seconds==60)                     {                     seconds=0;                       minute++;                     }                 }             }         }     }     public string tostring()     {         return(minute+":"+seconds+":"+smallestseconds);     } }


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