我尝试这个，它的工作正常。谢谢。
URL url = new URL(fileURL);URLConnection conexion = url.openConnection();conexion.connect();int lenghtOfFile = conexion.getContentLength();Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);InputStream input = new BufferedInputStream(url.openStream());OutputStream output = new FileOutputStream("/sdcard/caldophilus.jpg");byte data[] = new byte[1024];long total = 0;while ((count = input.read(data)) != -1) {total += count;output.write(data, 0, count);}output.flush();output.close();input.close();
