Java tutorial
/** * Android ownCloud News * * @author David Luhmer * @copyright 2013 David Luhmer david-dev@live.de * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE * License as published by the Free Software Foundation; either * version 3 of the License, or any later version. * * This library 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 AFFERO GENERAL PUBLIC LICENSE for more details. * * You should have received a copy of the GNU Affero General Public * License along with this library. If not, see <http://www.gnu.org/licenses/>. * */ package com.quarterfull.newsAndroid.services; import android.app.IntentService; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.support.v4.app.NotificationCompat; import android.widget.Toast; import com.nostra13.universalimageloader.core.ImageLoader; import java.util.ArrayList; import java.util.LinkedList; import java.util.List; import java.util.Random; import de.greenrobot.dao.query.LazyList; import com.quarterfull.newsAndroid.NewsReaderListActivity; import com.quarterfull.newsAndroid.R; import com.quarterfull.newsAndroid.async_tasks.GetImageThreaded; import com.quarterfull.newsAndroid.database.DatabaseConnectionOrm; import com.quarterfull.newsAndroid.database.model.Feed; import com.quarterfull.newsAndroid.database.model.RssItem; import com.quarterfull.newsAndroid.helper.FavIconHandler; import com.quarterfull.newsAndroid.helper.ImageDownloadFinished; import com.quarterfull.newsAndroid.helper.ImageHandler; public class DownloadImagesService extends IntentService { public static final String LAST_ITEM_ID = "LAST_ITEM_ID"; public enum DownloadMode { FAVICONS_ONLY, PICTURES_ONLY, FAVICONS_AND_PICTURES } public static final String DOWNLOAD_MODE_STRING = "DOWNLOAD_MODE"; private static Random random; private int NOTIFICATION_ID = 1; private NotificationManager notificationManager; private NotificationCompat.Builder mNotificationDownloadImages; private int maxCount; //private int total_size = 0; List<String> linksToImages = new LinkedList<>(); public DownloadImagesService() { super(null); } public DownloadImagesService(String name) { super(name); } @Override public void onCreate() { super.onCreate(); try { maxCount = 0; if (random == null) random = new Random(); NOTIFICATION_ID = random.nextInt(); } catch (Exception ex) { ex.printStackTrace(); } } @Override public void onDestroy() { if (mNotificationDownloadImages != null) { if (maxCount == 0) notificationManager.cancel(NOTIFICATION_ID); } super.onDestroy(); } @Override protected void onHandleIntent(Intent intent) { DownloadMode downloadMode = (DownloadMode) intent.getSerializableExtra(DOWNLOAD_MODE_STRING); DatabaseConnectionOrm dbConn = new DatabaseConnectionOrm(this); Notification notify = BuildNotification(); if (downloadMode.equals(DownloadMode.FAVICONS_ONLY)) { List<Feed> feedList = dbConn.getListOfFeeds(); FavIconHandler favIconHandler = new FavIconHandler(this); for (Feed feed : feedList) { favIconHandler.PreCacheFavIcon(feed); } } else if (downloadMode.equals(DownloadMode.FAVICONS_AND_PICTURES) || downloadMode.equals(DownloadMode.PICTURES_ONLY)) { long lastId = intent.getLongExtra(LAST_ITEM_ID, 0); List<RssItem> rssItemList = dbConn.getAllItemsWithIdHigher(lastId); List<String> links = new ArrayList<>(); for (RssItem rssItem : rssItemList) { String body = rssItem.getBody(); links.addAll(ImageHandler.getImageLinksFromText(body)); if (links.size() > 10000) { notificationManager.notify(123, GetNotificationLimitImagesReached(10000)); break; } } ((LazyList) rssItemList).close(); maxCount = links.size(); if (maxCount > 0) { notificationManager.notify(NOTIFICATION_ID, notify); } linksToImages.addAll(links); StartNextDownloadInQueue(); } } private synchronized void StartNextDownloadInQueue() { try { if (linksToImages.size() > 0) { String link = linksToImages.remove(0); new GetImageThreaded(link, imgDownloadFinished, 999).start(); } } catch (Exception ex) { ex.printStackTrace(); Toast.makeText(this, "Error while downloading images.", Toast.LENGTH_LONG).show(); } } private Notification GetNotificationLimitImagesReached(int limit) { Intent intentNewsReader = new Intent(this, NewsReaderListActivity.class); PendingIntent pIntent = PendingIntent.getActivity(this, 0, intentNewsReader, 0); NotificationCompat.Builder notifyBuilder = new NotificationCompat.Builder(this) .setContentTitle("ownCloud News Reader") .setContentText("Only " + limit + " images can be cached at once") .setSmallIcon(R.drawable.ic_notification).setContentIntent(pIntent); Notification notify = notifyBuilder.build(); //Hide the notification after its selected notify.flags |= Notification.FLAG_AUTO_CANCEL; return notify; } private Notification BuildNotification() { Intent intentNewsReader = new Intent(this, NewsReaderListActivity.class); PendingIntent pIntent = PendingIntent.getActivity(this, 0, intentNewsReader, 0); notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); mNotificationDownloadImages = new NotificationCompat.Builder(this) .setContentTitle(getResources().getString(R.string.app_name)) .setContentText("Downloading images for offline usage").setSmallIcon(R.drawable.ic_notification) .setContentIntent(pIntent).setOngoing(true); Notification notify = mNotificationDownloadImages.build(); //Hide the notification after its selected notify.flags |= Notification.FLAG_AUTO_CANCEL; notify.flags |= Notification.FLAG_NO_CLEAR; return notify; } private void RemoveOldImages() { ImageLoader.getInstance().clearDiskCache(); } ImageDownloadFinished imgDownloadFinished = new ImageDownloadFinished() { @Override public void DownloadFinished(long AsynkTaskId, Bitmap bitmap) { int count = maxCount - linksToImages.size(); if (maxCount == count) { notificationManager.cancel(NOTIFICATION_ID); //RemoveOldImages(); } else { mNotificationDownloadImages .setContentText("Downloading Images for offline usage - " + (count + 1) + "/" + maxCount) .setProgress(maxCount, count + 1, false); notificationManager.notify(NOTIFICATION_ID, mNotificationDownloadImages.build()); StartNextDownloadInQueue(); } } }; }