java - Check time every 5 minutes and compare it to button's time - Android -

i have class called eventbutton extends button.

all of button's settings in class, onclick() etc.

i have home activity has scrollview

the eventbuttons added home activity's scroll view when user presses menu button. don't instantiate object call new eventbutton()

when user clicks on button dialog displayed , user set's name of "event" , time of "event".

the name , time displayed on button inside scollview on home activity.

my question is, how go refreshing eventbutton every, say, 5 minutes check if time set on has passed. have tried timertask , timer , handler neither seem work. timertask kept crashing, found out it's better use handler in android.

    private void scheduledelay() {      eventbutton.this.postdelayed(new runnable() {         @override         public void run() {             // todo auto-generated method stub             int mhour = calendar.get(calendar.hour_of_day);             int mminute = calendar.get(calendar.minute);              if(eventbutton.hour < mhour || eventbutton.minute < mminute) {                 eventbutton.this.setbackgroundcolor(color.red);             }             eventbutton.this.postdelayed(this, 5);         }     }, 5); } 

the above called when user sets name , time of eventbutton in alertdialog.

update

the problem doesn't seem handler after all. seems when try hour , minute it's crashing.

change usage 5 minutes (5 * 60 * 1000) not 5 milliseconds:

private void scheduledelay() {      eventbutton.this.postdelayed(new runnable() {         @override         public void run() {             // todo auto-generated method stub             int mhour = calendar.get(calendar.hour_of_day);             int mminute = calendar.get(calendar.minute);              if(eventbutton.hour < mhour || eventbutton.minute < mminute) {                 eventbutton.this.setbackgroundcolor(color.red);             } else {                 // wait 5 minutes                 scheduledelay();             }          }     }, 300000); }