BaseAdapter在getView（）方法调用时返回错误的位置

Question

奇怪的是，我的CustomBaseAdapter错误地返回了需要膨胀的项目，等等，适配器将错误的数据显示在行上！

虽然我现在用的是ViewHolder模式，我的ListView layout_height设置为match_parent和无微不至我发现，以保证项目的ListView稳定，已经落实，CustomBaseAdapter似乎没有它响应。

getView（）方法

@Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     final ViewHolder holder; 
     mItemView = convertView; 
     if (convertView == null) { 
      mItemView = mInflater.inflate(R.layout.layout_listview_row, parent, false); 
      holder = new ViewHolder(); 
      //setting up the Views 
      mItemView.setTag(holder); 
     } else { 
      holder = (ViewHolder) mItemView.getTag(); 
     } 

     //Getting the item 
     final MyItem item = getItem(position); 

     //Doing some checks on my item and then display the appropriate data. 

     //By saying checks i mean something like: 

     if(item.getSomething().equals("blabla")){ 
      //Load some pic 
     }else{ 
      //Load another pic 
     } 
     //Now when i have scrolled the list once and return back to top, 
     //Suddenly in Logcat i am seeing that the first row is getting matched to 
     //the object in the 4th position, but it doesnt display its data. It displays 
     //the text from the first item as it was supposed to do. But the relation between 
     //the first row and the item's position is like 0->4. 
} 

其他方法

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

@Override 
public MyItem getItem(int position) { 
    return this.mObjects.get(position); 
} 

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

我从字面上搜索并尝试在谷歌的一切！似乎没有任何东西给我一个解决方案。

任何帮助，将不胜感激！让我知道你是否需要更多的代码。

Answer 1

我怀疑mItemView是罪魁祸首这里。通过名称来判断，这是一个实例字段，因此如果CustomBaseAdapter中有多个线程调用getView()，则mItemView可能会更改它指向哪个循环视图。另外，我假设getView()以return mItemView结尾，对吧？

无论如何，我会建议尝试消除mItemView，只是写这样的功能：

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    if (convertView == null) { 
     convertView = mInflater.inflate(R.layout.layout_listview_row, parent, false); 
     ViewHolder holder = new ViewHolder(); 
     //setting up the Views 
     convertView.setTag(holder); 
    } 

    ViewHolder holder = (ViewHolder) convertView.getTag(); 

    // ... 

    return convertView; 
} 

Answer 2

您正在“回收”显示对象，但您有责任向其中获取适当的数据。问题是这行代码：

mItemView = convertView; 

convertView是您的数据的“容器”。如果convertView不为空，则构建容器，但必须将适当的数据放入其中。这通常通过“使用”位置指示器来完成。

也许是这样的：

if (convertView == null) { 
     mItemView = mInflater.inflate(R.layout.layout_listview_row, parent, false); 
     holder = new ViewHolder(); 
     //setting up the Views 
     mItemView.setTag(holder); 
    } else { 
     holder = getItem(position); 
     mItemView.setTag(holder); 
    }