Mam listview, który pobiera dane z bazy sqlite przez Jsona.

Chcę przekształcić go w dynamiczny podgląd listy, który na końcu przewijania wyświetla „stopuj więcej elementów” w stopce listy, podczas ładowania kolejnych elementów i dodawania ich do adaptera (na przykład 10 elementów za każdym razem). Mam problem z implementacją tej funkcji. Pomóż mi z tym. Dzięki.

public class AllProductsActivity extends Activity {

... defining variables...;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    new LoadAllProducts().execute();

}

class LoadAllProducts extends AsyncTask<String, String, String> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        ... progress dialog...
    }

    protected String doInBackground(String... args) {
        countryList = new ArrayList<Country>();
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);

        Log.d("All Products: ", json.toString());

        try {
            // Checking for SUCCESS TAG
            int success = json.getInt(TAG_SUCCESS);

            if (success == 1) {
                // products found
                // Getting Array of Products
                products = json.getJSONArray(TAG_PRODUCTS);

                // looping through All Products
                for (int i = 0; i < products.length(); i++) {
                    JSONObject c = products.getJSONObject(i);

                    // Storing each json item in variable
                    String id = c.getString(TAG_PID);
                    String name = c.getString(TAG_NAME);
                    String description = c.getString(TAG_DESCRIPTION);
                    String due_date = c.getString(TAG_DUE_DATE);
                    String staff = c.getString(TAG_STAFF);
                    String status = c.getString(TAG_STATUS);

                    country = new Country(id,name,description,
                            due_date, staff, status);
                    countryList.add(country);
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return null;
    }

    protected void onPostExecute(String file_url) {
        pDialog.dismiss();
        runOnUiThread(new Runnable() {
            public void run() {

                displayListView();

            }
        });
    }
}

private void displayListView() {
    dataAdapter = new MyCustomAdapter(this,
            R.layout.country_info, countryList);
    ListView listView = (ListView) findViewById(R.id.listView1);
    listView.setAdapter(dataAdapter);
}

private class MyCustomAdapter extends ArrayAdapter<Country> {

    ... blah blah blah ...

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

        ViewHolder holder = null;
        Log.v("ConvertView", String.valueOf(position));
        if (convertView == null) {
        ... blah blah blah ...
        }

        return convertView;
    }
}
}