Handle RSS feeds that do not properly sort dated items (fixes #82) and those who do not provide a date at all (fixes #78 by relying on the last viewed url instead).

core/src/org/transdroid/core/app/settings/ApplicationSettings.java

@@ -382,7 +382,8 @@ public class ApplicationSettings {
 				prefs.getString("rssfeed_name_" + order, null), 
 				prefs.getString("rssfeed_url_" + order, null), 
 				prefs.getBoolean("rssfeed_reqauth_" + order, false), 
-				lastViewed == -1L ? null : new Date(lastViewed));
+				lastViewed == -1L ? null : new Date(lastViewed),
+				prefs.getString("rssfeed_lastvieweditemurl_" + order, null));
 		// @formatter:on
 	}
 
@@ -421,11 +422,15 @@ public class ApplicationSettings {
 	 * Use {@link #getRssfeedSetting(int)} to get fresh data.
 	 * @param order The identifying order number/key of the settings of te RSS feed that was viewed
 	 * @param lastViewed The date and time that the feed was last viewed; typically now
+	 * @param lastViewedItemUrl The url of the last item the last time that the feed was viewed
 	 */
-	public void setRssfeedLastViewer(int order, Date lastViewed) {
+	public void setRssfeedLastViewer(int order, Date lastViewed, String lastViewedItemUrl) {
 		if (prefs.getString("rssfeed_url_" + order, null) == null)
 			return; // The settings that were requested to be removed do not exist
-		prefs.edit().putLong("rssfeed_lastviewed_" + order, lastViewed.getTime()).commit();
+		Editor edit = prefs.edit();
+		edit.putLong("rssfeed_lastviewed_" + order, lastViewed.getTime());
+		edit.putString("rssfeed_lastvieweditemurl_" + order, lastViewedItemUrl);
+		edit.commit();
 	}
 
 	/**

core/src/org/transdroid/core/app/settings/RssfeedSetting.java

@@ -36,13 +36,16 @@ public class RssfeedSetting implements SimpleListItem {
 	private final String url;
 	private final boolean requiresAuth;
 	private Date lastViewed;
+	private final String lastViewedItemUrl;
 
-	public RssfeedSetting(int order, String name, String baseUrl, boolean needsAuth, Date lastViewed) {
+	public RssfeedSetting(int order, String name, String baseUrl, boolean needsAuth, Date lastViewed,
+			String lastViewedItemUrl) {
 		this.order = order;
 		this.name = name;
 		this.url = baseUrl;
 		this.requiresAuth = needsAuth;
 		this.lastViewed = lastViewed;
+		this.lastViewedItemUrl = lastViewedItemUrl;
 	}
 
 	public int getOrder() {
@@ -68,14 +71,24 @@ public class RssfeedSetting implements SimpleListItem {
 		return requiresAuth;
 	}
 
+	/**
+	 * Returns the date on which we last checked this feed. Note that this is NOT updated automatically after the
+	 * settings were loaded from {@link ApplicationSettings}; instead the settings have to be manually loaded again
+	 * using {@link ApplicationSettings#getRssfeedSetting(int)}.
+	 * @return The last new item's URL as URL-encoded string
+	 */
+	public Date getLastViewed() {
+		return this.lastViewed;
+	}
+
 	/**
 	 * Returns the URL of the item that was the newest last time we checked this feed. Note that this is NOT updated
 	 * automatically after the settings were loaded from {@link ApplicationSettings}; instead the settings have to be
 	 * manually loaded again using {@link ApplicationSettings#getRssfeedSetting(int)}.
 	 * @return The last new item's URL as URL-encoded string
 	 */
-	public Date getLastViewed() {
-		return this.lastViewed;
+	public String getLastViewedItemUrl() {
+		return this.lastViewedItemUrl;
 	}
 
 	/**

core/src/org/transdroid/core/gui/rss/RssfeedLoader.java

@@ -16,6 +16,11 @@
  */
 package org.transdroid.core.gui.rss;
 
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Date;
+import java.util.List;
+
 import org.transdroid.core.app.settings.RssfeedSetting;
 import org.transdroid.core.rssparser.Channel;
 import org.transdroid.core.rssparser.Item;
@@ -31,46 +36,74 @@ public class RssfeedLoader {
 	private Channel channel = null;
 	private int newCount = -1;
 	private boolean hasError = false;
-	
+
 	public RssfeedLoader(RssfeedSetting setting) {
 		this.setting = setting;
 	}
-	
+
 	public void update(Channel channel, boolean hasError) {
 		this.channel = channel;
 		this.hasError = hasError;
-		if (channel == null || hasError) {
+		if (channel == null || channel.getItems() == null || hasError) {
 			hasError = true;
 			newCount = -1;
 			return;
 		}
-		// Count the number of new items, based on the date that this RSS feed was last viewed by the user
-		newCount = 0;
-		for (Item item : channel.getItems()) {
-			if (item.getPubdate() == null || setting.getLastViewed() == null
-					|| item.getPubdate().after(setting.getLastViewed())) {
-				newCount++;
-				item.setIsNew(true);
-			} else {
-				item.setIsNew(false);
+		// Peek if this feed properly supports publish dates
+		boolean usePublishDate = false;
+		if (channel.getItems().size() > 0) {
+			Date pubDate = channel.getItems().get(0).getPubdate();
+			usePublishDate = pubDate != null && pubDate.getTime() > 0;
+		}
+		if (usePublishDate) {
+			// Count the number of new items, based on the date that this RSS feed was last viewed by the user
+			newCount = 0;
+			List<Item> items = channel.getItems();
+			// Reverse-order sort the items on their published date
+			Collections.sort(items, new Comparator<Item>() {
+				@Override
+				public int compare(Item lhs, Item rhs) {
+					return 0 - lhs.getPubdate().compareTo(rhs.getPubdate());
+				}
+			});
+			for (Item item : items) {
+				if (item.getPubdate() == null || setting.getLastViewed() == null
+						|| item.getPubdate().after(setting.getLastViewed())) {
+					newCount++;
+					item.setIsNew(true);
+				} else {
+					item.setIsNew(false);
+				}
+			}
+		} else {
+			// Use the url of the last RSS item the last time the feed was viewed by the user to count new items
+			boolean isNew = true;
+			for (Item item : channel.getItems()) {
+				if (item.getTheLink() != null && setting.getLastViewedItemUrl() != null
+						&& item.getTheLink().equals(setting.getLastViewedItemUrl())) {
+					isNew = false;
+				}
+				if (isNew)
+					newCount++;
+				item.setIsNew(isNew);
 			}
 		}
 	}
-	
+
 	public Channel getChannel() {
 		return channel;
 	}
-	
+
 	public RssfeedSetting getSetting() {
 		return setting;
 	}
-	
+
 	public int getNewCount() {
 		return newCount;
 	}
 
 	public boolean hasError() {
-		return hasError ;
+		return hasError;
 	}
 
 }

core/src/org/transdroid/core/gui/rss/RssfeedsActivity.java

@@ -149,11 +149,13 @@ public class RssfeedsActivity extends SherlockFragmentActivity {
 		// The RSS feed content was loaded and can now be shown in the dedicated fragment or a new activity
 		if (fragmentItems != null) {
 
-			// If desired, update the lastViewedDate of this feed in the user setting; this won't be loaded until the
-			// RSS
-			// feeds screen in opened again.
+			// If desired, update the lastViewedDate and lastViewedItemUrl of this feed in the user setting; this won't
+			// be loaded until the RSS feeds screen in opened again.
 			if (!loader.hasError() && loader.getChannel() != null && markAsViewedNow) {
-				applicationSettings.setRssfeedLastViewer(loader.getSetting().getOrder(), new Date());
+				String lastViewedItemUrl = null;
+				if (loader.getChannel().getItems() != null && loader.getChannel().getItems().size() > 0)
+					lastViewedItemUrl = loader.getChannel().getItems().get(0).getTheLink();
+				applicationSettings.setRssfeedLastViewer(loader.getSetting().getOrder(), new Date(), lastViewedItemUrl);
 			}
 			fragmentItems.update(loader.getChannel(), loader.hasError());
 
@@ -169,11 +171,13 @@ public class RssfeedsActivity extends SherlockFragmentActivity {
 				return;
 			}
 
-			// If desired, update the lastViewedDate of this feed in the user setting; this won't be loaded until the
-			// RSS
-			// feeds screen in opened again
+			// If desired, update the lastViewedDate and lastViewedItemUrl of this feed in the user setting; this won't
+			// be loaded until the RSS feeds screen in opened again
 			if (markAsViewedNow) {
-				applicationSettings.setRssfeedLastViewer(loader.getSetting().getOrder(), new Date());
+				String lastViewedItemUrl = null;
+				if (loader.getChannel().getItems() != null && loader.getChannel().getItems().size() > 0)
+					lastViewedItemUrl = loader.getChannel().getItems().get(0).getTheLink();
+				applicationSettings.setRssfeedLastViewer(loader.getSetting().getOrder(), new Date(), lastViewedItemUrl);
 			}
 
 			String name = loader.getChannel().getTitle();