CODEWITHSUNDEEP
androidandroid-listviewandroid-asynctask
CodePrimate
CodePrimate

Reputation: 6666

NullPointer Exception when setting the adapter for a ListView

I am trying to set the data to an adapter through an AsyncTask. This has caused alot of grief - Most recently when trying to set the Array Adapter.

The following method is called onPostExecute();

private void setQueues(final JSONObject[] qInfo) 
{
    queues = new QueueItem[qInfo.length];

    for(int i = 0; i < qInfo.length; i++)
    {
        queues[i] = new QueueItem();
        //final int ii = i;

        // Formatting the queue title
        String name = qInfo[i].optString("name").replace("-", " ");
        queues[i].label = name;

        try {
            if(qInfo[i].getString("active").contains("1"))
            {
                queues[i].value = true;
            }
            else
            {
                queues[i].value = false;
            }
        } 
        catch (JSONException e) 
        {
            e.printStackTrace();
        }
    }
    lv.setAdapter(new QueueAdapter(getActivity(), 
            R.layout.queues_items, queues));

This causes the following exception runtime : link here

EDIT : As requested, here is QueueAdapter :

public class QueueAdapter extends ArrayAdapter<QueueItem>{

Context context; 
int layoutResourceId;    
QueueItem data[] = null;

public QueueAdapter(Context context, int layoutResourceId, QueueItem[] data) {
    super(context, layoutResourceId, data);
    this.layoutResourceId = layoutResourceId;
    this.context = context;
    this.data = data;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    QueueHolder holder = null;

    if(row == null)
    {
        LayoutInflater inflater = ((Activity)context).getLayoutInflater();
        row = inflater.inflate(layoutResourceId, parent, false);

        holder = new QueueHolder();
        holder.queueswitch = (Switch)row.findViewById(R.id.queues_item_switch);
        holder.txtLabel = (TextView)row.findViewById(R.id.queues_item_text);

        row.setTag(holder);
    }
    else
    {
    holder = (QueueHolder)row.getTag();
    }

    QueueItem queue = data[position];
    holder.txtLabel.setText(queue.label);
    holder.queueswitch.setChecked(queue.value);

    return row;
}

static class QueueHolder
{
    Switch queueswitch;
    TextView txtLabel;
}
}

Upvotes: 0

Views: 442

Answers (1)

ngesh
ngesh

Reputation: 13501

lv.setAdapter(new QueueAdapter(getActivity(), 
            R.layout.queues_items, queues));

this snippet should be in try block.. Because If there is JSONException all elements in that array will be null...

I mean to say.. put for loop inside try block and not the oppt.. if you still want to loop when an Exception occurs.. Then Try using Collections instead of array..

Upvotes: 1

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