android - Why isn't onChronometerTick being called? -

my code never enters onchronometertick method. doing incorrectly? need set tick time somehow? can't figure out way that.

elapsedtimer.setonchronometerticklistener(new chronometer.onchronometerticklistener() {     @override     public void onchronometertick(chronometer chronometer) {         countup[0] = (systemclock.elapsedrealtime() - chronometer.getbase()) / 1000;         elapsedtimedynamic.settext("" + countup);     } }); elapsedtimer.start(); 

for in future having trouble using chronometer elapsed timer/stopwatch , can't figure out, ended scrapping chronometer , using countdowntimer, using in such way count up:

final long starttime = system.currenttimemillis(); elapsedtimer = new countdowntimer(activitytime + 1000, 100) {     @override     public void ontick(long l) {          long elapsedtime = system.currenttimemillis() - starttime;         elapsedtime = elapsedtime/1000;         elapsedtimetextview.settext(string.format("%02d", (elapsedtime)));     }      @override     public void onfinish() {      } }.start();