how to set alarm to repeat monthly

Question

Currently I am working on an application to set reminders on monthly basis. I am not able to provide the correct repeating interval for my alarmmanager. Pls provide info about the same. this is my code, but this will not raise alarm for Feb or months having 30 days. Also pls provide code to set yearly repeating alaram.

repeatTime=(AlarmManager.INTERVAL_DAY*31);
mAlarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, when.getTimeInMillis(), repeatTime, pi);

Thanks, Sharath

Answer 1

this is how you calculate interval between today in extacly one month after, use this logic to reset alarm everytime once it triggers. i.e set alarm to the point when you want to start, supply some pending intent, once alarm triggers use below code to get next trigger time, and set alarm again to trigger at that time.

private long getDuration(){
    // get todays date
    Calendar cal = Calendar.getInstance();
    // get current month
    int currentMonth = cal.get(Calendar.MONTH);

    // move month ahead
    currentMonth++;
    // check if has not exceeded threshold of december

    if(currentMonth > Calendar.DECEMBER){
        // alright, reset month to jan and forward year by 1 e.g fro 2013 to 2014
        currentMonth = Calendar.JANUARY;
        // Move year ahead as well
        cal.set(Calendar.YEAR, cal.get(Calendar.YEAR)+1);
    }

    // reset calendar to next month
    cal.set(Calendar.MONTH, currentMonth);
    // get the maximum possible days in this month
    int maximumDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

    // set the calendar to maximum day (e.g in case of fEB 28th, or leap 29th)
    cal.set(Calendar.DAY_OF_MONTH, maximumDay);
    long thenTime = cal.getTimeInMillis(); // this is time one month ahead



    return (thenTime); // this is what you set as trigger point time i.e one month after

}

Answer 2

To set alarm which repeat monthly,

        Calendar calender= Calendar.getInstance(TimeZone.getDefault());
        int cDay = calender.get(Calendar.DAY_OF_MONTH);

        calender.set(Calendar.HOUR_OF_DAY, hour); //hour you have selected
        calender.set(Calendar.MINUTE, min); //min you have selected
        calender.set(Calendar.SECOND, 0);
        calender.set(Calendar.MILLISECOND, 0);

        calender.set(Calendar.DATE, cDay);
        calender.get(Calendar.MONTH);

        Calendar now = Calendar.getInstance();
        now.set(Calendar.SECOND, 0);
        now.set(Calendar.MILLISECOND, 0);

        int days = now.getActualMaximum(Calendar.DAY_OF_MONTH);

        if (calender.before(now)) {  //this condition is used for future alarm only
            calender.add(Calendar.DATE, days);
        }

        final int _id = (int) System.currentTimeMillis();

        Intent i = new Intent(activity, YourServiceClass.class);
        i.putExtra("type", "month");

        PendingIntent displayIntent = PendingIntent.getBroadcast(
                activity, _id, i, PendingIntent.FLAG_UPDATE_CURRENT);

        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

        alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, calender.getTimeInMillis(), AlarmManager.INTERVAL_DAY * calender.getActualMaximum(Calendar.DAY_OF_MONTH), displayIntent);

Now in your service class , put below code

if (intent.getExtras() != null) {

        type = intent.getStringExtra("type");
    }

    if (type != null) {

        if (type.equals("month")) {

            Long futureTimeDifference = intent.getLongExtra("futureTimeDifference", 0); // Receive the time difference in milliseconds from currenttime in milliseconds and the future set date milliseconds
            futureTimeDifference = futureTimeDifference + System.currentTimeMillis();// get the next schedule date time inmilliseconds
            String repeatType = intent.getStringExtra("getRepeatType");// Receive the repeat type


            Date todaysDate = new Date();// initialize a new date object
            Calendar getCurrentDate = Calendar.getInstance();// Initialize a new Calendar object
            getCurrentDate.setTime(todaysDate); //Set the calendar to todays date
            int currentMonth = getCurrentDate.get(Calendar.MONTH); // Assign the current month in integer

            if (currentMonth == Calendar.JANUARY || currentMonth == Calendar.MARCH || currentMonth == Calendar.MAY || currentMonth == Calendar.JULY || currentMonth == Calendar.AUGUST || currentMonth == Calendar.OCTOBER || currentMonth == Calendar.DECEMBER) {
                futureTimeDifference = System.currentTimeMillis() + (AlarmManager.INTERVAL_DAY * 31);
            }
            if (currentMonth == Calendar.APRIL || currentMonth == Calendar.JUNE || currentMonth == Calendar.SEPTEMBER || currentMonth == Calendar.NOVEMBER) {
                futureTimeDifference = System.currentTimeMillis() + (AlarmManager.INTERVAL_DAY * 30);
            }

            if (currentMonth == Calendar.FEBRUARY) {//for february month)
                GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();
                if (cal.isLeapYear(cal.get(Calendar.YEAR))) {//for leap year february month
                    futureTimeDifference = System.currentTimeMillis() + (AlarmManager.INTERVAL_DAY * 29);
                } else { //for non leap year february month
                    futureTimeDifference = System.currentTimeMillis() + (AlarmManager.INTERVAL_DAY * 28);
                }
            }

            final int monthly_id = (int) System.currentTimeMillis();

            Log.e("MonthlyNotification", futureTimeDifference + "");

            PendingIntent displayIntent = PendingIntent.getBroadcast(
                    context, monthly_id, intent, PendingIntent.FLAG_UPDATE_CURRENT);

            AlarmManager alarmManager = (AlarmManager) context.getSystemService(ALARM_SERVICE);

            alarmManager.set(AlarmManager.RTC_WAKEUP, futureTimeDifference, displayIntent);

            //Toast.makeText(context, "Notification Set Monthly", Toast.LENGTH_SHORT).show();
        }
    }