android多线程下载代码

//声明控件//路径与线程数量privateEditTextet_url,et_num;//进度条publicstaticProgressBarpb_thread;//显示进度的操作privateTextViewtv_pb;//线程的数量publicstaticintthreadNum=3;//每个线程负责下载的大小publicintblockSize;publicstaticintthreadCount;//数量//访问的pathpublicStringpath;publicstaticbooleanflag=true;//