摘要： 文件下载步骤:·创建一个HttpURLConnection对象HttpURLConnection urlConn = (HttpURLConnection)url.openConnection();·获得一个InputStream对象urlConn.getInputStream()·访问网络的权限android.permission.INTERNET访问SDCARD:得到当前设备的SD卡目录：Environment.getExternalStorageDirectory()访问SD卡的权限：android.permissin.WRITE_EXTERNAL_STOR 阅读全文