Adding new item to ArrayAdapter

Question

I want to add a new item to my arrayadapter and then for it to render in my view. After digging online, I noticed that the ArrayAdapter class keeps its own version of the arraylist as mentioned here: Android ListView not refreshing after notifyDataSetChanged.

Heres my code:

The add new item code:

public void addRecordSet(View view) {

    RecordStats recordStats = new RecordStats();
    recordStats.RecordID = mRecord.id;

    long recordStatId = mDatabaseHelper.addRecordStats(recordStats);
    recordStats.ID = (int) recordStatId;

    recordStatsList.add(recordStats);
    mAdapter.swapRecordFormList(recordStatsList);
}

The arrayadapter code:

    public void swapRecordFormList(ArrayList<RecordStats> recordStatsList) {
        mRecordStatsList = recordStatsList;
        notifyDataSetChanged();
    }

However, i get this error:

Process: com.example.andyxu.enzo3, PID: 19289

java.lang.IndexOutOfBoundsException: Index: 3, Size: 3
    at java.util.ArrayList.get(ArrayList.java:437)

Any ideas?

EDIT:

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    View recordForm = convertView;
    if (recordForm == null) {
        recordForm = LayoutInflater.from(mContext).inflate(R.layout.custom_record_form, parent, false);
    }

    RecordStats currentRecord = mRecordStatsList.get(position);

    EditText reps = (EditText) recordForm.findViewById(R.id.reps);
    if (currentRecord.Reps > 0) {
        reps.setText(String.valueOf(currentRecord.Reps));
    }

    EditText weight = (EditText) recordForm.findViewById(R.id.weight);
    if (currentRecord.Weight > 0) {
        weight.setText(String.valueOf(currentRecord.Weight));
    }
    return recordForm;
}

where do you get? Can you post that code? – Mukit09 Feb 10 '19 at 02:45 — Mukit09, Feb 10 '19 at 02:45

score 1 · Accepted Answer · answered Feb 10 '19 at 02:49

1

ArrayAdapter can be backed by a live list object that you provide. (So the link you referenced is not quite relevant to your situation). With an ArrayAdapter all you need to do is call add on the backing list object and then call notifyDataSetChanged.

List<String> list = new ArrayList<>();
ArrayAdapter<String> adatper = new ArrayAdapter<String>(this, android.R.layout.layout, list);
listView.setAdapter(adapter);

list.add("Another item");
adapter.notifyDataSetChanged();

answered Feb 10 '19 at 02:49

jspcal

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Hmm... I did that initially and it worked but whenever I add a new item, its values are defaulted to the previous item in that list which is not what I want. Any ideas? – anderish Feb 10 '19 at 03:08
Perhaps an issue with `getView` if that's being overridden? Could you post the full code. – jspcal Feb 10 '19 at 03:09
Added the `getView` function. @jspcal – anderish Feb 10 '19 at 03:24
Nvm, I am an idiot. I figured out my problem haha. Thanks for helping me – anderish Feb 10 '19 at 03:29

Adding new item to ArrayAdapter

1 Answers1