Java/Android Calendar, add 1 week on Sundays

Question

OK, so my code has worked good until the day became Sunday.

I'm working on an app that uses the Calendar util allot, so it functioning the way i think it does is important to me! The problem:

    import java.util.Calendar;

    ...

    Calendar test = Calendar.getInstance();

    test.setFirstDayOfWeek(Calendar.MONDAY);

    Log.e("WEEEK TEST:", ""+ test.get(Calendar.WEEK_OF_YEAR));

    test.add(Calendar.WEEK_OF_YEAR, 1);

    Log.e("WEEEK TEST:", ""+ test.get(Calendar.WEEK_OF_YEAR));

Outputs this:

     06-01 14:04:07.636  12005-12005/test.app E/WEEEK TEST:﹕ 23
     06-01 14:04:07.636  12005-12005/test.app E/WEEEK TEST:﹕ 23

How can this even happen, and how do i fix it?

Is your device date and time correct? Did you make that test today? — joao2fast4u, Jun 01 '14 at 14:07
Yes i tested it today, but i don't think it matters how my phone is configured because I'm adding a week, which should add a week whatever the date on my phone is. Shouldn't it? How can this week be 23, and then in a week, it's also week 23? — user1004147, Jun 01 '14 at 14:24
I found a "hack": One has to add -1, then add 1 week, before using the Calendar after setFirstDayOfWeek(). — user1004147, Jun 01 '14 at 14:34
Then, you must explain your hack as an answer. It's a hack, yet it is still a solution. :D — joao2fast4u, Jun 02 '14 at 00:21

score 1 · Accepted Answer · answered Sep 23 '14 at 12:15

1

Calendar test = Calendar.getInstance();
test.add(Calendar.WEEK_OF_YEAR, -1);
test.add(Calendar.WEEK_OF_YEAR, 1);
test.setFirstDayOfWeek(Calendar.MONDAY);

Now "test" should work correctly

answered Sep 23 '14 at 12:15

user1004147

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Java/Android Calendar, add 1 week on Sundays

1 Answers1