private void updateView(int itemIndex) {
   //得到第一个可显示控件的位置，
   int visiblePosition = mListView.getFirstVisiblePosition();
   //只有当要更新的view在可见的位置时才更新，不可见时，跳过不更新
   if (itemIndex - visiblePosition >= ) {
    //得到要更新的item的view
    View view = mListView.getChildAt(itemIndex - visiblePosition);
    //调用adapter更新界面
    mAdapter.updateView(view, itemIndex);
   }
  }

 @Override
   public void onReceive(Context context, Intent intent) {
    AppContent appContent = intent.getParcelableExtra("appContent");
    if(appContent == null) return;
    int itemIndex = ;
    for(AppContent appContent : mList) {
     if(appContent.getUrl().equals(appContent.getUrl())) {
      itemIndex = mList.indexOf(appContent);
      appContent.setDownloadPercent(appContent.getDownloadPercent());
      break;
     }
    }
    updateView(itemIndex);
   }

 public class AppContentAdapter extends BaseAdapter{
  private List<AppContent> mDates = null;
  private Context mContext;
  public AppContentAdapter(Context context) {
   this.mContext = context;
  }
  @Override
  public int getCount() {
   return mDates.size();
  }
  @Override
  public Object getItem(int position) {
   return mDates.get(position);
  }
  @Override
  public long getItemId(int position) {
   return position;
  }
  public void setDates(List<AppContent> mDates) {
   this.mDates = mDates;
  }
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   ViewHolder holder = null;
   if (convertView == null) {
    holder = new ViewHolder();
    convertView = LayoutInflater.from(mContext).inflate(
      R.layout.listitem_download, null);
    holder.statusIcon = (DownloadPercentView) convertView.findViewById(R.id.status_icon);
    holder.name = (TextView) convertView.findViewById(R.id.name);
    holder.downloadPercent = (TextView) convertView.findViewById(R.id.download_percent);
    holder.progressBar = (ProgressBar) convertView.findViewById(R.id.progressbar);
    convertView.setTag(holder);
   } else {
    holder = (ViewHolder) convertView.getTag();
   }
   setData(holder, position);
   return convertView;
  }
  /**
  * 设置viewHolder的数据
  * @param holder
  * @param itemIndex
  */
  private void setData(ViewHolder holder, int itemIndex) {
   AppContent appContent = mDates.get(itemIndex);
   holder.name.setText(appContent.getName());
   holder.progressBar.setProgress(appContent.getDownloadPercent());
   setIconByStatus(holder.statusIcon, appContent.getStatus());
   if(appContent.getStatus() == AppContent.Status.PENDING) {
    holder.downloadPercent.setVisibility(View.INVISIBLE);
   } else {
    holder.downloadPercent.setVisibility(View.VISIBLE);
    holder.statusIcon.setProgress(appContent.getDownloadPercent());
    holder.downloadPercent.setText("下载进度：" + appContent.getDownloadPercent() + "%");
   }
  }
  /**
  * 局部刷新
  * @param view
  * @param itemIndex
  */
  public void updateView(View view, int itemIndex) {
   if(view == null) {
    return;
   }
   //从view中取得holder
   ViewHolder holder = (ViewHolder) view.getTag();
   holder.statusIcon = (DownloadPercentView) view.findViewById(R.id.status_icon);
   holder.name = (TextView) view.findViewById(R.id.name);
   holder.downloadPercent = (TextView) view.findViewById(R.id.download_percent);
   holder.progressBar = (ProgressBar) view.findViewById(R.id.progressbar);
   setData(holder, itemIndex);
  }
  /**
  * 根据状态设置图标
  * @param downloadPercentView
  * @param status
  */
  private void setIconByStatus(DownloadPercentView downloadPercentView, AppContent.Status status) {
   downloadPercentView.setVisibility(View.VISIBLE);
   if(status == AppContent.Status.PENDING) {
    downloadPercentView.setStatus(DownloadPercentView.STATUS_PEDDING);
   }
   if(status == AppContent.Status.DOWNLOADING) {
    downloadPercentView.setStatus(DownloadPercentView.STATUS_DOWNLOADING);
   }
   if(status == AppContent.Status.WAITING) {
    downloadPercentView.setStatus(DownloadPercentView.STATUS_WAITING);
   }
   if(status == AppContent.Status.PAUSED) {
    downloadPercentView.setStatus(DownloadPercentView.STATUS_PAUSED);
   }
   if(status == AppContent.Status.FINISHED) {
    downloadPercentView.setStatus(DownloadPercentView.STATUS_FINISHED);
   }
  }
  private class ViewHolder {
   private DownloadPercentView statusIcon;
   private TextView name;
   private TextView downloadPercent;
   private ProgressBar progressBar;
  }
 }