ListView Android中的錯誤引用？

Question

大家好，

我有堅持我的第2天，一個問題，正如你所看到的圖像，我只啓動進程＃1和更新過程來處理吧，但是當我向下滾動我看到另一個「進程酒吧「運行，它具有與我的第一個（＃1）相同的進程狀態。我想我的ListView項目被重複使用，它也使用我的進程欄，是否有人遇到這個問題？我還附上代碼如下，

感謝您的閱讀

class gridAdapter extends BaseAdapter{ 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return list.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 
     String currentText = list.get(position); 
     View cell = convertView; 
     if(cell==null){ 
      LayoutInflater inflater = MainActivity.this.getLayoutInflater(); 
      cell = inflater.inflate(R.layout.gird_tiem, null); 
       ViewHolder viewHolder = new ViewHolder(); 
       viewHolder.text = (TextView) cell.findViewById(R.id.tv_test); 
       viewHolder.button = (Button) cell.findViewById(R.id.button); 
       viewHolder.progressBar = (ProgressBar) cell.findViewById(R.id.process); 
       cell.setTag(viewHolder); 
     } 

     final ViewHolder holder = (ViewHolder) cell.getTag(); 
     holder.text.setText(currentText); 
     holder.button.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       processManager.onAddItemClick(100, holder.progressBar); 
      } 
     }); 
     return cell; 
    } 


} 

static class ViewHolder { 
    public TextView text; 
    public Button button; 
    public ProgressBar progressBar; 
    } 

//我的流程管理

public class ProcessManager { 

Activity activity; 

public ProcessManager(Activity activity) { 
    super(); 
    this.activity = activity; 
} 

int temp; 
public void onAddItemClick(final int tasks, final ProgressBar cell) { 
    new Thread(new Runnable() { 

     @Override 
     public void run() { 
      for(int i = 0;i<tasks;i++){ 
       temp = i; 
       Thread thread = new Thread(new Runnable() { 

        @Override 
        public void run() { 
         // TODO Auto-generated method stub 

        } 
       }); 

       thread.run(); 
       try { 
        thread.sleep(500); 
       } catch (InterruptedException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
       activity.runOnUiThread(new Runnable() { 

        @Override 
        public void run() { 
         // TODO Auto-generated method stub 
         cell.setProgress((temp*100)/tasks); 
        } 
       }); 

      } 

     } 
    }).start(); 



} 

//我的產品

<?xml version="1.0" encoding="utf-8"?> 

<TextView 
    android:id="@+id/tv_test" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="XXXX" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Start Process" 
    android:id="@+id/button" 
    android:focusable="false" /> 

<ProgressBar 
    android:id="@+id/process" 
    style="?android:attr/progressBarStyleHorizontal" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:max="100" /> 

//我的網格視圖

Answer 1

儘量不要從持有人忽略的TextView所以

if TextView == null 

然後拿到TextView的，否則只能回擊。

Answer 2

你需要把

final ViewHolder holder = (ViewHolder) cell.getTag(); 

在else支架您if(cell==null)後聲明。否則，每次都會從標籤中創建子項（回收視圖）。