Android：当我添加动态新的ListView条目时,ListView中的旋转器会丢失它们的值

我遵循了之前的stackoverflow线程的指示,如下所示：Android Listview with spinner and a checkbox关于如何使用像Spinners这样的可聚焦对象填充ListViews.

我的问题是每次我在ListView中动态添加一个新的ListView条目时,前一个ListView条目的Spinner值都会丢失(实际上Spinner返回其默认设置).为简单起见,我的Spinners填充了以下数据：

String spinner_data[] = {"apple","banana","pear","watermelon","strawBerry"};

例如,如果我选择我的第一个ListView的Spinner值为“pear”,然后我用Button添加一个新的ListView条目,则“pear”条目将从第一个ListView Spinner中消失,并显示默认值“apple”.

任何帮助表示赞赏！

这是我的活动：

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

    lv = (ListView) findViewById(R.id.lv);       
    da = new DataAdapter(this,new ArrayList<RawData>());
    lv.setAdapter(da);

    btn_new = (Button)findViewById(R.id.btn_new);

    btn_new.setOnClickListener(new View.onClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            da.add(new RawData(this));
                      da.notifyDataSetChanged();
        }
    });

}

RawData类是这样的：

public class RawData {
privatE int SELEcted_position;
private ArrayAdapter<CharSequence> adapter;

public RawData(Context context)
{
    adapter = ArrayAdapter.createFromresource(context,R.array.data,android.R.layout.simple_spinner_item);
    adapter.setDropDownViewresource(android.R.layout.simple_spinner_dropdown_item);
}

public ArrayAdapter<CharSequence> getAdapter() 
{         
    return adapter;     
}

/**
 * get adapter's item text from SELEcted position
 * @return
 */
public String getText() 
{         
    return (String) adapter.getItem(SELEcted_position);     
}

public int getSELEcted() 
{   
    return SELEcted_position;     
}

public void setSELEcted(int SELEcted) 
{         
    this.SELEcted_position = SELEcted;     
}
 }

DataArrayAdapter如下：

public class DataArrayAdapter extends ArrayAdapter<RawData> {
private Activity myContext;
//private final List<RawData> list;

public DataArrayAdapter(Activity context,List<RawData> list) 
{         
    super(context,R.layout.row_view,list);         
    myContext = context;
} 

static class ViewHolder
{
    protected RawData data;
    protected Spinner spn;
    protected EditText edt;
}

@Override
public View getView(int position,View convertView,ViewGroup parent)
{
    View view = null;
    if ( convertView == null )
    {
        LayoutInflater inflator = myContext.getLayoutInflater();             
        view = inflator.inflate(R.layout.row_view,null);

        final ViewHolder viewHolder = new ViewHolder(); 

        viewHolder.edt = (EditText)view.findViewById(R.id.edt);
        viewHolder.data = new RawData(myContext);
        viewHolder.spn = (Spinner)view.findViewById(R.id.spn);
        viewHolder.spn.setAdapter(viewHolder.data.getAdapter());

    viewHolder.spn.setOnItemSELEctedListener(new OnItemSELEctedListener() {

        @Override
        public void onItemSELEcted(AdapterView<?> arg0,View arg1,int arg2_position,long arg3) {
                // TODO Auto-generated method stub
    viewHolder.data.setSELEcted(arg2_position);
            }

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

            }
        });

        // update the TextView to reflect what's in the Spinner
        view.setTag(viewHolder);
    }
    else
    {
        view = convertView;
    }

    // This is what gets called every time the ListView refreshes
    ViewHolder holder = (ViewHolder) view.getTag();

               holder.spn.setSELEction(getItem(position).getSELEcted());

    return view;
}

 }