android - 如何从 onitemclick() 方法通知 DataSetChanged()？

Question

单击每个项目后，我必须更改 ListView 中的数据 任何人都可以告诉我如何在 ListView 中单击项目后通知更改。我没有使用基本适配器。我使用的是自定义适配器。任何帮助都将非常有用。 检查我的代码。我正在尝试在用户点击的位置添加按钮。是否可能。当我尝试点击该位置时它会强制关闭。以下是我的代码。

public class CamNe extends Activity implements OnItemClickListener,OnItemSelectedListener{
    /** Called when the activity is first created. */
String[] items={"lorem", "ipsum", "dolor", "sit", "amet",
            "consectetuer", "adipiscing", "elit", "morbi", "vel",
            "ligula", "vitae", "arcu", "aliquet", "mollis",
            "etiam", "vel", "erat", "placerat", "ante",
            "porttitor", "sodales", "pellentesque", "augue",
            "purus"};
int pos=0;
ListView ls;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);



        ListView ls=(ListView)findViewById(R.id.list);
        //ls1=(ListView)findViewById(R.id.list);

        ls.setAdapter(new adapter(getApplicationContext(), items));
        ls.setOnItemClickListener(this);


    }
    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // TODO Auto-generated method stub
        pos=arg2;

        setTitle("mil");
        ListAdapter ad=ls.getAdapter();
        ((ArrayAdapter) ad).notifyDataSetChanged();



    }
    class adapter extends ArrayAdapter{

        private Context context;

        public adapter(Context context,String[] items) {
            super(context,R.layout.row,items);
            this.context=context;
            // TODO Auto-generated constructor stub
        }
        public View getView(int position, View convertView,
                ViewGroup parent) {
            View row=convertView;
            ViewWrapper wrapper;
            Button but = null;
            if (row==null) {
                LayoutInflater inflater = (LayoutInflater)context.getSystemService
                (Context.LAYOUT_INFLATER_SERVICE);


                row=inflater.inflate(R.layout.row, null);
                wrapper=new ViewWrapper(row);
                row.setTag(wrapper);

                but=wrapper.getRatingBar();
                but.setVisibility(4);
            if(position==pos){
                but.setVisibility(0);
            }

                }
            else {
                wrapper=(ViewWrapper)row.getTag();
            if(position==pos)
                but=wrapper.getRatingBar();
            }
            wrapper.getLabel().setText(items[position]);
            if(position==pos){
            but.setTag(new Integer(pos));
            }
                return row;
        }

    }
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
        // TODO Auto-generated method stub
        setTitle("mil");
        pos=arg2;
        ((BaseAdapter) ls.getAdapter()).notifyDataSetChanged();



    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }


}  

Answer 1

在你的 onItemClick() 方法中像这样

ListAdapter uradapteobjr=listview.getAdapter();

uradapterobj.notifyDataSetChanged();