Question

在我的应用程序中的简单ListView中，我想在向下滚动时添加列表末尾的项目并刷新它。我的代码只能将数据传递到ListView，它无法添加到列表的末尾并刷新它。请帮我解决这个问题。感谢。

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

要使用新行加载ListView，您应在列表更改后致电setAdapter。

而不是：

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

我会尝试

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

或者只是

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

当您使用ListFragment时。您可能还需要拨打notifyDataSetChanged()，但我不完全确定

由ArrayAdapter安装的Android Refresh ListView

2 个答案: