AsyncTask导致FC研究(4)

            View view = convertView; 
            ViewHolder vh; 
            if(view == null) { 
                view = LayoutInflater.from(ActivityA.this).inflate(R.layout.list_item, null); 
                vh = new ViewHolder(); 
                vh.tv = (TextView) view.findViewById(R.id.textView); 
                vh.iv = (ImageView) view.findViewById(R.id.imageView); 
                view.setTag(vh); 
            } 
            vh = (ViewHolder) view.getTag(); 
            vh.tv.setText((String) mData.get(position).get("title")); 
            Integer id = (Integer) mData.get(position).get("pic"); 
            if(id != null) { 
                vh.iv.setImageResource(id); 
            } 
            else { 
                vh.iv.setImageBitmap(null); 
            } 
             
            FifoAsyncTask task = (FifoAsyncTask) mData.get(position).get("task"); 
            if(task == null || task.isCancelled()) { 
                Log.d("Test", "" + position); 
                mData.get(position).put("task", new GetItemImageTask(position).execute(null));//执行获取图片的任务  
            } 
             
            return view;