android - Runnable not run -

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i using handler , runnable display time of media player. runnable don't run. code is:

handler timerhandler;  public contstructor() {         timerhandler = new handler();     }

i'm using:

runnable sourcetimer = new runnable() {         @override         public void run() {              long totalduration = source.getduration();             long currentduration = source.getcurrentposition();              string remaindurationlabel = millisecondstotimer(totalduration - currentduration);             log.e(tag, "source remain time " + remaindurationlabel);              timerhandler.postdelayed(this, 100);         }     };

start timer:

void sourceplay() {         source.start();         timerhandler.postdelayed(sourcetimer, 0);     }

i don't receive error not logging "source remain time " in logcat.

what's problem?


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