对于java软件断点续传功能,后台下载任务,ui更新进度条,多线程下载-For java software HTTP functionality, background downloading tasks, ui update progress bar, multi-threaded download

android中listView控件的某ITEM单独更新，并且指出了常见的一种错误-Android listView control of a particular ITEM particular update, and points out the common kind of error