Items in listview not setting up using BaseAdapter and SimpleAdapter

Question

I'm facing problem with setting up the items in ListView, I'm using an Async task for updating the items. Here is what I have done so far.

Async Task onPostExecute()

@Override
    protected void onPostExecute(String result) {
        notifyList = new ArrayList<HashMap<String, String>>();

        try {

            JSONObject rootObj = new JSONObject(result);
            JSONObject jSearchData = rootObj.getJSONObject("notifications");

            int maxlimit = 5;

            for (int i = 0; i < maxlimit; i++) {
                JSONObject jNotification0 = jSearchData.getJSONObject(""
                        + i + "");

                String text = jNotification0.getString("text");
                String amount = jNotification0.getString("amount");
                String state = jNotification0.getString("state");

                System.out.println(text);
                System.out.println(amount);
                System.out.println(state);

                HashMap<String, String> map = new HashMap<String, String>();

                map.put("text", text);
                map.put("amount", amount);

                notifyList.add(map);
            }

            if (notification_adapter != null) {
                notification_list.setAdapter(new CustomNotificationAdapter(
                        notifyList));
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

Here is my CustomNotification class which extends BaseAdapter

public class CustomNotificationAdapter extends BaseAdapter {

    public ArrayList<HashMap<String, String>> notificationData = new ArrayList<HashMap<String, String>>();

    public CustomNotificationAdapter(
            ArrayList<HashMap<String, String>> notificationData) {
        this.notificationData = notificationData;
    }

    @Override
    public int getCount() {

        return notificationData.size();
    }

    @Override
    public Object getItem(int position) {

        return notificationData.get(position).get("text").toString();
    }

    @Override
    public long getItemId(int position) {

        return notificationData.get(position).get("text").hashCode();
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View vi = convertView;
        LayoutInflater inflater = getLayoutInflater();

        vi = inflater.inflate(R.layout.custom_notification_list, null);
        TextView notificationText = (TextView) findViewById(R.id.notificationText);
        TextView notificationAmount = (TextView) findViewById(R.id.notificationPoint);
        notificationText
                .setText(notificationData.get(position).get("text"));
        notificationAmount.setText(notificationData.get(position).get(
                "amount"));

        return vi;

    }

}

NotificationAdapter class which extends SimpleAdapter

public class NotificationAdapter extends SimpleAdapter {

List<Map<String, String>> cur_list = new ArrayList<Map<String, String>>();

public NotificationAdapter(Context context,
        List<? extends Map<String, ?>> data, int resource, String[] from,
        int[] to) {
    super(context, data, resource, from, to);

}
}

I'm able to get all the data from JSONResponse but I'm not able to show it on the list. What am I missing?

Any kind of help will be appreciated.

Answer 1

Try replacing this:

if (notification_adapter != null) {
                notification_list.setAdapter(new CustomNotificationAdapter(
                        notifyList));
            }

with this:

notification_adapter  = new CustomNotificationAdapter(notifyList);
notification_list.setAdapter(notification_adapter);

This will set the adapter to the new JSON data even if notification_adapter was previously null.

Answer 2

Call notification_adapter.notifyDataSetChanged() after updating your adapter's data or remove the if (notification_adapter != null) {if you want it easy and bad.

to update your data:

 public void updateData(ArrayList<HashMap<String, String> notificationData){
       this.notificationData = notificationData;
       this.notifyDataSetChanged();
}

Inside your adapter, and call it like: notification_adapter.updateData(notifyList);