ArrayList contains null after being passed to next activity

Question

I use an ArrayList to store some data and then pass it to the next activity where it is actually required through the .putStringArrayList() method. I use the same process in a couple of places in a my project where it works absolutely fine. However, in this particular case, when I extract it in the receiving activity, it contains null. To be sure, I even displayed the list before sending it, and it did displayed the strings I require. Here is my code for sending the Arraylist:

 for(int i=0; i<AssignmentTitles.size(); i++)
        {
            System.out.println(AssignmentTitles.get(i));

        }
        Intent localIntent;
        localIntent = new Intent(CourseFolder.this, Assignments.class);
        Bundle b=new Bundle();
        b.putStringArrayList("titles",AnnouncementTitles);
        b.putStringArrayList("links",AnnouncementLinks);
        localIntent.putExtras(b);

        startActivity(localIntent);

Here is the receiving activity code:

    AssignmentTitles = getIntent().getStringArrayListExtra("titles");
    AssignmentLinks = getIntent().getStringArrayListExtra("links");
    System.out.println("size: " + AssignmentLinks.size() + "TITLES:");
    for(int i=0; i<AssignmentTitles.size(); i++)
    {
        System.out.println(AssignmentTitles.get(i));

    }
    setListAdapter( new ArrayAdapter<String(Assignments.this,
    android.R.layout.simple_list_item_1,
    AssignmentTitles));

The problem is that I use the exact same code in another part of my project and it works perfectly, what could be the problem?

Ok I can see you have printed the ArrayList of AssignmentTitles but sending AnnouncementTitles. Is that correct ? — Jibran Khan, Oct 11 '14 at 12:51
Check : http://stackoverflow.com/questions/18649728/android-cannot-pass-intent-extras-though-alarmmanager/18649849#18649849 — Haresh Chhelana, Oct 11 '14 at 12:53
@Jibran I love you. Such a stupid mistake, thanks for pointing it out. — Saad Rehman, Oct 11 '14 at 13:11

score 1 · Accepted Answer · answered Oct 11 '14 at 12:51

1

Try this way

AssignmentTitles = getIntent().getExtras().getStringArrayList("titles");
        AssignmentTitles = getIntent().getExtras().getStringArrayList("links");

answered Oct 11 '14 at 12:51

Biraj Zalavadia

28,348
10
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77

score 0 · Answer 2 · answered Oct 11 '14 at 12:49

0

Use Intent.getExtras() to get the Bundle first, then extract your array lists.

answered Oct 11 '14 at 12:49

Larry Schiefer

15,687
2
27
33

ArrayList contains null after being passed to next activity

2 Answers2