Android通过ArrayAdapter刷新ListView

Question

in simple ListView in my application i want to add items end of list when scrolling down is finished and refresh that. my code only work to pass data into ListView and it does not working to add to end of list and refresh that. please help me to resolve this problem. Thanks.

private ItemAdapter adapter;

public class ReceivedFragment extends ListFragment implements AbsListView.OnScrollListener {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        items = new ArrayList<Item>();

        for ( int i=0; i<=10; i++){
             String a = String.format("title %s", i);
             String b = String.format("description %s", i);
             Item item = new Item(a , b , String.valueOf(i) );
             items.add(item);
        }
        adapter = new ItemAdapter(getActivity(), items);
        setListAdapter(adapter);
        return super.onCreateView(inflater, container, savedInstanceState);
    }

    @Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
     if (prevVisibleItem != firstVisibleItem) {
        if ((firstVisibleItem + visibleItemCount) == totalItemCount) {

            Toast.makeText(getActivity(), R.string.please_wait_to_response_from_server, Toast.LENGTH_LONG).show();

            Thread thread = new Thread() {
                @Override
                public void run() {
                    getActivity().runOnUiThread(new Runnable() {
                        public void run() {
                            for (int i = (int) getLastID(); i <= getLastID() + 10; i++) {
                                String a = String.format("title %s", i);
                                String b = String.format("description %s", i);
                                Item item = new Item(a, b, String.valueOf(i));
                                items.add(item);
                            }
                            adapter.notifyDataSetChanged();
                        }
                    });
                }
            };
        }
    }
}

    @Override
    public void onListItemClick(ListView l, View v, int position, long thisID) {
        super.onListItemClick(l, v, position, thisID);
    }
    public long getLastID() {
        return Long.parseLong(items.get(items.size() - 1).getmLastID());
    }
}

ArrayAdapter:

public class ItemAdapter extends ArrayAdapter<Item> {

    public ItemAdapter(Context c, List<Item> items) {
        super(c,0,items);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ItemView itemView = (ItemView)convertView;
        if (null == itemView)
            itemView = ItemView.inflate(parent);

        itemView.setItem(getItem(position));

        itemView.setBackgroundColor(((position % 2)!=0) ? Color.rgb(229, 229, 229) : Color.WHITE);
        return itemView;
    }

}

Answer 1

    ArrayAdapter adapter = (ArrayAdapter)yourListView.getAdapter();

  ArrayList<Item>  items = new ArrayList<Item>();
                 for ( int i= (int) getLastID(); i<= getLastID() + 10; i++){

            String a = String.format("title %s", i);
            String b = String.format("description %s", i);

                    Item item = new Item(a , b , String.valueOf(i) );
                    items.add(item);

                }
        adapter.addAll(items);
        adapter.notifyDataSetChanged();

Answer 2

To load your ListView with new rows, you should call to setAdapter after your list changes.

Instead of :

new ItemAdapter(getActivity(), items).notifyDataSetChanged();

I would try

my_listview.setAdapter(new ItemAdapter(getActivity(), items); //items must contains the old and the new items

Or just

setAdapter(new ItemAdapter(getActivity(), items); 

As you are using a ListFragment. It is possible that you may need also to call notifyDataSetChanged() , but I am not completely sure