next reminder

public Calendar getNextAlarmTime() {
        Calendar now = Calendar.getInstance();
        Calendar reminderTime = Calendar.getInstance();
        Calendar expireDate = Calendar.getInstance();

        SimpleDateFormat hourMinuteFormat = new SimpleDateFormat("HH:mm", Locale.ENGLISH);
        SimpleDateFormat expireDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.ENGLISH);

        try {
            expireDate.setTime(expireDateFormat.parse(expired));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        expireDate.add(Calendar.DATE, 1);

        String nowHourString = hourMinuteFormat.format(now);

        int listSize = reminderTimes.size();
        for (int i = 0; i<listSize; i++) {
            String time = reminderTimes.get(i);

            int stringComp = nowHourString.compareTo(time);
            if (stringComp<0) {
                try {
                    reminderTime.setTime(hourMinuteFormat.parse(time));

                    if (reminderTime.before(expireDate))
                        return reminderTime;
                    else
                        return null;

                } catch (ParseException e) {
                    e.printStackTrace();
                    return null;
                }
            } else if (i==listSize-1) {
                try {
                    reminderTime.setTime(hourMinuteFormat.parse(reminderTimes.get(0)));
                    reminderTime.add(Calendar.DATE, reminderInterval);

                    if (reminderTime.before(expireDate))
                        return reminderTime;
                    else
                        return null;

                } catch (ParseException e) {
                    e.printStackTrace();
                    return null;
                }
            }

        }
        return null;
    }