java - 如何从我的自定义基础适配器中删除项目？

Question

我正在扩展 BaseAdapter 以制作自定义 ListView 行。我有上下文菜单，每次用户按住该行时都会打开，并提示他是否要删除它。但是如何删除该行？ hashmap只是测试数据。

private MyListAdapter myListAdapter;
private ArrayList<HashMap<String, String>> items;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    items = new ArrayList<HashMap<String,String>>();
    HashMap<String, String> map1 = new HashMap<String, String>();
    map1.put("date", "10/09/2011");
    map1.put("distance", "309 km");
    map1.put("duration", "1t 45min");
    items.add(map1);

    myListAdapter = new MyListAdapter(this, items);
    setListAdapter(myListAdapter);
    getListView().setOnCreateContextMenuListener(this);
}


private class MyListAdapter extends BaseAdapter {

    private Context context;
    private ArrayList<HashMap<String, String>> items;

    public MyListAdapter(Context context, ArrayList<HashMap<String, String>> items) {
        this.context = context;
        this.items = items;
    }

    @Override
    public int getCount() {
        return items.size();
    }

    @Override
    public Object getItem(int position) {
        return items.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

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

        View view = convertView;

        if (view == null) {
            LayoutInflater layoutInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = layoutInflater.inflate(R.layout.row_log, null);
        }

        TextView rowLogOverview = (TextView) view.findViewById(R.id.rowLogOverview);

        HashMap<String, String> item = items.get(position);
        rowLogOverview.setText(item.get("date"));

        return view;
    }
}

Answer 1

您不要从适配器中删除!你从项目中删除!并且适配器位于您的项目和 View 之间。从 View 中您可以获得位置，并根据位置可以删除项目。然后适配器将刷新您的 View 。

这意味着你需要做这样的事情

 items.remove(position);
adapter.notifyDataSetChanged()