Java tutorial
/** * This file is part of Picasa Photo Uploader. * * Picasa Photo Uploader is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Picasa Photo Uploader is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Picasa Photo Uploader. If not, see <http://www.gnu.org/licenses/>. */ package com.android.picasaphotouploader; import java.io.ByteArrayInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import org.apache.http.entity.ByteArrayEntity; /** * Class to override ByteArrayEntity for HttpClient to write multipart related * content and to progress upload monitoring for notification when uploading * a file to Picasa * * @author Jan Peter Hooiveld */ public class MultipartNotificationEntity extends ByteArrayEntity { /** * Upload notification */ private UploadNotification notification; /** * Constructor * * @param multipart Multipart class that creates the content * @throws UnsupportedEncodingException * @throws FileNotFoundException * @throws IOException */ public MultipartNotificationEntity(Multipart multipart, UploadNotification notification) throws UnsupportedEncodingException, FileNotFoundException, IOException { // call parent to set content super(multipart.getContent()); // add notification this.notification = notification; // set content type setContentType("multipart/related; boundary=\"" + multipart.getBoundary() + "\""); } /** * Write content to outputstream of HttpClient * * @param outstream Outputstreaam of the HttpClient * @throws IOException */ @Override public void writeTo(final OutputStream outstream) throws IOException { // check if we have an outputstrean if (outstream == null) { throw new IllegalArgumentException("Output stream may not be null"); } // create file input stream InputStream instream = new ByteArrayInputStream(this.content); try { // create vars byte[] tmp = new byte[4096]; int total = (int) this.content.length; int progress = 0; int increment = 10; int l; int percent; // read file and write to http output stream while ((l = instream.read(tmp)) != -1) { // check progress progress = progress + l; percent = Math.round(((float) progress / (float) total) * 100); // if percent exceeds increment update status notification // and adjust increment if (percent > increment) { increment += 10; notification.update(progress); } // write to output stream outstream.write(tmp, 0, l); } // flush output stream outstream.flush(); } finally { // close input stream instream.close(); } } }