Android ListView顯示錯誤的位置

Question

我遇到問題ListView。適配器的下面的代碼：

public class AdapterListViewEncyclopedia extends ArrayAdapter<Apple> { 

    private int layoutResourceId; 
    private Context context; 
    private List<Apple> data; 
    private CellHolder holder; 

    public AdapterListViewEncyclopedia(Context context, int layoutResourceId, List<Apple> data) { 
     super(context, layoutResourceId, data); 
     this.layoutResourceId = layoutResourceId; 
     this.context = context; 
     this.data = data; 
    } 


    static class CellHolder 
    { 
     ImageView imageApple; 
     TextView tvCellAppleName; 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) 
    { 
     View row = convertView; 

     if(row == null) 
     { 
      LayoutInflater inflater = ((Activity)context).getLayoutInflater(); 
      row = inflater.inflate(layoutResourceId, parent, false); 

      holder = new CellHolder(); 
      holder.imageApple = (ImageView) row.findViewById(R.id.imageApple); 
      holder.tvCellAppleName = (TextView)row.findViewById(R.id.tvAppleName); 

      ImageLoader imageLoader = ImageLoader.getInstance(); 
      imageLoader.displayImage(InterfaceConfig.serverURL+data.get(position).getImageURL(), holder.imageApple); 


      holder.tvCellAppleName.setText(data.get(position).getName()); 
      System.out.println(position); 
      row.setTag(holder); 
     } 
     else 
     { 
      holder = (CellHolder)row.getTag(); 
     } 

     return row; 
    } 

} 

的主要問題：

1.I有10個數據ArrayAdapter<Apple>，當我打開網頁，ListView和我打印位置代碼System.out.println，代碼顯示0 ，1,2,3,4,5,0 2.當我滾動ListView，頂部和底部隱藏是隨機的位置。

任何人都可以幫我解決我的問題嗎？

Answer 1

我已更新代碼請嘗試此操作。您必須在if-else塊之後設置數據，否則在綁定數據時無法在列表視圖中獲得正確的位置。請參閱Android視圖持有者屬性 ViewHolder

public class AdapterListViewEncyclopedia extends ArrayAdapter<Apple> { 

private int layoutResourceId; 
private Context context; 
private List<Apple> data; 
private CellHolder holder; 

public AdapterListViewEncyclopedia(Context context, int layoutResourceId, List<Apple> data) { 
    super(context, layoutResourceId, data); 
    this.layoutResourceId = layoutResourceId; 
    this.context = context; 
    this.data = data; 
} 


static class CellHolder 
{ 
    ImageView imageApple; 
    TextView tvCellAppleName; 
} 

@Override 
public View getView(final int position, View convertView, ViewGroup parent) 
{ 
    View row = convertView; 

    if(row == null) 
    { 
     LayoutInflater inflater = ((Activity)context).getLayoutInflater(); 
     row = inflater.inflate(layoutResourceId, parent, false); 

     holder = new CellHolder(); 
     holder.imageApple = (ImageView) row.findViewById(R.id.imageApple); 
     holder.tvCellAppleName = (TextView)row.findViewById(R.id.tvAppleName); 
     row.setTag(holder); 
    } 
    else 
    { 
     holder = (CellHolder)row.getTag(); 
    } 
    // you can set the data here 
    setData(position,holder); 

    return row; 
} 
private void setData(int position, CellHolder holder) 
{ 
    ImageLoader imageLoader = ImageLoader.getInstance(); 
    imageLoader.displayImage(InterfaceConfig.serverURL+data.get(position).getImageURL(), holder.imageApple); 

    holder.tvCellAppleName.setText(data.get(position).getName()); 
} 
}