How to add subitems in a ListView

Question

I'm trying to add subItems in my ListView. My listView should be organized with emails for items and their institution for the subitems, but with the following code I just added items, how can I add my subitems on it? I've tried so many things but it doesn't work.

        List<Login> listEmails = JsonUtil.getAllEmails(json);

        ArrayList<String> emails = new ArrayList<String>();

        ArrayList<String> institutions = new ArrayList<String>();

        for (Login loginObj : listEmails) {

            emails.add(loginObj.getEmailAndress());
        }

        for (Login loginObj : listEmails) {

            institutions.add(loginObj.getInstitution());
        }

        ArrayAdapter<String> adapter;

        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, emails);

        emailListView.setAdapter(adapter);

By subitems, do you mean something like [example A](http://docs.xamarin.com/samples/mobile-samples/TablesLists/Screenshots/Android/SimpleListItem2.png) or [example B](https://lh3.ggpht.com/__9PneCDHGgs/TJKOEOIl--I/AAAAAAAACt0/HI8ui6yN7JQ/s1600/sample_expandable_list_view_android.png)? — Sam, Mar 22 '13 at 20:52

score 3 · Answer 1 · answered Mar 22 '13 at 20:53

You need a custom adapter with two textviews and in its getView() method set the appropriate data to each of your textviews.

Also by now you are passing to your adapter only the emails array, you'll need a different structure to include institutions too.

score 0 · Accepted Answer · answered Mar 22 '13 at 21:07

The right way to do that is to create a HashMap for each item: Look the code below:

List<Login> listEmails = JsonUtil.getAllEmails(json);

                ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>(listEmails.size());

                for (Login loginObj : listEmails) {

                    HashMap<String, String> item = new HashMap<String, String>();
                    item.put("email", loginObj.getEmailAndress());
                    item.put("institution", loginObj.getInstitution());

                    list.add(item);
                }

                String[] from = new String[] { "email", "institution" };

                int[] to = new int[] { android.R.id.text1, android.R.id.text2 };

                int nativeLayout = android.R.layout.two_line_list_item;

                emailListView.setAdapter(new SimpleAdapter(this, list, nativeLayout , from, to));

How to add subitems in a ListView

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