How to set an alarm to fire properly at fixed time?

Question

I have this code

Calendar c = new GregorianCalendar();
        c.add(Calendar.DAY_OF_YEAR, 1);
        c.set(Calendar.HOUR_OF_DAY, 23);
        c.set(Calenda         


        

Answer 1

I had success with the following code, if you only want to set the alarm for the next occurance of hh:mm

Calendar cal = new GregorianCalendar();
    cal.setTimeInMillis(System.currentTimeMillis());
    cal.set(Calendar.HOUR_OF_DAY, 22);
    cal.set(Calendar.MINUTE, 19);
    cal.set(Calendar.SECOND, 0);
    cal.set(Calendar.MILLISECOND, 0);
    //check if we want to wake up tomorrow
    if (System.currentTimeMillis() > cal.getTimeInMillis()){
        cal.setTimeInMillis(cal.getTimeInMillis()+ 24*60*60*1000);// Okay, then tomorrow ...
    }