如何改进这个填满日历网格的算法?

我有一个网格,它将呈现一个日历,并且我有一个 ArrayList<CalendarEventEntity> 其中包含事件。这些事件必须在网格中突出显示。

因为我必须自己填写表格,所以我有这样的东西:

for( loop through the days of the month ){
    Calendar eventDate = event.getDate();
    // look for the events in the calendar that matchs this day
    for(CalendarEventEntity event : events) {
        // if there are events in this specific day
        if( eventDate.get(Calendar.YEAR) == calendarMonth.get(Calendar.YEAR) &&
            eventDate.get(Calendar.MONTH) == calendarMonth.get(Calendar.MONTH) &&
            eventDate.get(Calendar.DAY_OF_MONTH) == dayIndex ) {
            // highlight it!!!
        }
    }

}

这个很好用,但是太慢了。所以我想加快速度!我在里面加了这个 for :

// ignore dates which does not make part of this month or year
if( eventDate.get(Calendar.YEAR) < calendarMonth.get(Calendar.YEAR) ||
    eventDate.get(Calendar.MONTH) < calendarMonth.get(Calendar.MONTH) ||
    eventDate.get(Calendar.DAY_OF_MONTH) != DateIdx ) {
    continue;
}

// stop when processing dates which are higher than this month or year
if( eventDate.get(Calendar.YEAR) > calendarMonth.get(Calendar.YEAR) ||
    eventDate.get(Calendar.MONTH) > calendarMonth.get(Calendar.MONTH) 
    || eventDate.get(Calendar.DAY_OF_MONTH) != DateIdx ) {
    break;
}

这使得速度更快,但还是太慢了。如何改进此算法?