去Listview找到当前可以看见的ItemView, 以及对应的要刷新的View, 例如Progressbar 刷新之

List
    
      epiDownloadBeans = mDownloadAdapter.getList();                    int firstVisiblePosition = dl_listview.getFirstVisiblePosition();                    int lastVisiblePosition = dl_listview.getLastVisiblePosition();                    for (int i = firstVisiblePosition; i < lastVisiblePosition; i++) {                        View itemView = dl_listview.getChildAt(i-firstVisiblePosition);                        if (itemView == null) {                            LogUtil.d(TAG, "itemView == null");                            continue;                        }                        ProgressBar progressBar = (ProgressBar) itemView.findViewById(R.id.dl_item_progress);                        if (i < 0 || i >= epiDownloadBeans.size()) {                            LogUtil.e(TAG, "surprise index when get epiDownloadBean i = " + i);                            continue;                        }                        EpiDownloadBean epiDownloadBean = epiDownloadBeans.get(i);                        if (progressBar != null) {                            try {                                epiDownloadBean.setPrecent((int) (TaskManager.getInstance().getDownloadTask(epiDownloadBean.getTask_id(), epiDownloadBean.getUrl(), epiDownloadBean.getSavePath()).getPercent() * 100));                                progressBar.setProgress(epiDownloadBean.getPrecent());                            } catch (Exception e) {                                e.printStackTrace();                            }                        }                    }
    

参考

http://www.cnblogs.com/liuling/p/2015-10-20-01.html

http://www.jianshu.com/p/45a43a117365