Merge branch '305-new-forum-list' into 'master'

New List of Forums

The adapter of the `ForumListFragment` has been changed into a
`BriarRecyclerView` and all its code has been adapted and simplified
accordingly.

All UI of the forum list is now defined in XML layouts. This enabled me to move the snackbar into onCreate().

Before:

![device-2016-05-03-165331](/uploads/961cc2c043464f446584de4ae0ad527b/device-2016-05-03-165331.png)

After:

![device-2016-05-03-165117](/uploads/e22ede3e9a3330762b3ae84f86ca6ec5/device-2016-05-03-165117.png)


See merge request !175

briar-android/res/layout/briar_recycler_view.xml

@@ -24,6 +24,7 @@
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
 		android:layout_centerInParent="true"
+		android:padding="@dimen/margin_activity_horizontal"
 		android:textSize="@dimen/text_size_large"
 		android:text="@string/no_data"/>
 

briar-android/res/layout/fragment_forum_list.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<org.briarproject.android.util.BriarRecyclerView
+	android:id="@+id/forumList"
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"/>

briar-android/res/layout/list_item_forum.xml

@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="wrap_content"
+	android:layout_marginLeft="@dimen/listitem_horizontal_margin"
+	android:layout_marginStart="@dimen/listitem_horizontal_margin"
+	android:paddingTop="@dimen/listitem_horizontal_margin"
+	android:background="?attr/selectableItemBackground">
+
+	<TextView
+		android:id="@+id/forumNameView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:maxLines="2"
+		android:textColor="@color/briar_text_primary"
+		android:textSize="@dimen/text_size_medium"
+		tools:text="This is a name of a forum"/>
+
+	<TextView
+		android:id="@+id/unreadView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_alignParentLeft="true"
+		android:layout_alignParentStart="true"
+		android:layout_below="@+id/forumNameView"
+		android:layout_toLeftOf="@+id/dateView"
+		android:paddingTop="@dimen/margin_medium"
+		android:paddingBottom="@dimen/listitem_horizontal_margin"
+		android:textColor="@color/briar_text_secondary"
+		android:textSize="@dimen/text_size_small"
+		android:text="@string/no_unread_posts"/>
+
+	<TextView
+		android:id="@+id/dateView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_alignParentRight="true"
+		android:layout_alignParentEnd="true"
+		android:layout_below="@+id/forumNameView"
+		android:paddingTop="@dimen/margin_medium"
+		android:paddingBottom="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:textColor="@color/briar_text_secondary"
+		android:textSize="@dimen/text_size_small"
+		tools:text="Dec 24"/>
+
+	<View style="@style/Divider.ForumList"
+	      android:layout_below="@+id/unreadView"
+	      android:layout_alignParentLeft="true"
+	      android:layout_alignParentStart="true"/>
+
+</RelativeLayout>
+

briar-android/res/values/strings.xml

@@ -72,7 +72,7 @@
 	<string name="private_message_hint">Type message</string>
 	<string name="message_sent_toast">Message sent</string>
 	<string name="forums_title">Forums</string>
-	<string name="no_forums">No forums</string>
+	<string name="no_forums">You don\'t have any forums.\n\nWhy don\'t you create a new one yourself or ask your contacts to share one with you?</string>
 	<plurals name="forums_shared">
 		<item quantity="one">%d forum shared by contacts</item>
 		<item quantity="other">%d forums shared by contacts</item>
@@ -81,6 +81,11 @@
 	<string name="forum_leave">Leave Forum</string>
 	<string name="forum_left_toast">Left Forum</string>
 	<string name="no_forum_posts">No posts</string>
+	<string name="no_unread_posts">no unread posts</string>
+	<plurals name="unread_posts">
+		<item quantity="one">%d unread post</item>
+		<item quantity="other">%d unread posts</item>
+	</plurals>
 	<string name="create_forum_title">New Forum</string>
 	<string name="choose_forum_name">Choose a name for your forum:</string>
 	<string name="create_forum_button">Create Forum</string>

briar-android/res/values/styles.xml

@@ -107,6 +107,11 @@
 		<item name="android:layout_marginLeft">@dimen/margin_large</item>
 	</style>
 
+	<style name="Divider.ForumList" parent="Divider">
+		<item name="android:layout_width">match_parent</item>
+		<item name="android:layout_height">1dp</item>
+	</style>
+
 	<style name="NavMenuButton" parent="Widget.AppCompat.Button.Borderless.Colored">
 		<item name="android:textSize">@dimen/text_size_medium</item>
 		<item name="android:textColor">@android:color/tertiary_text_light</item>

briar-android/src/org/briarproject/android/forum/ForumListAdapter.java

@@ -1,70 +1,193 @@
 package org.briarproject.android.forum;
 
 import android.content.Context;
-import android.content.res.Resources;
+import android.content.Intent;
+import android.support.annotation.Nullable;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.util.SortedList;
+import android.support.v7.widget.RecyclerView;
 import android.text.format.DateUtils;
+import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.ArrayAdapter;
-import android.widget.LinearLayout;
 import android.widget.TextView;
 
 import org.briarproject.R;
-import org.briarproject.android.util.LayoutUtils;
+import org.briarproject.api.forum.Forum;
+import org.briarproject.api.sync.GroupId;
 
-import java.util.ArrayList;
+import java.util.Collection;
 
-import static android.text.TextUtils.TruncateAt.END;
-import static android.widget.LinearLayout.HORIZONTAL;
-import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP_1;
+import static org.briarproject.android.BriarActivity.GROUP_ID;
+import static org.briarproject.android.forum.ForumActivity.FORUM_NAME;
 
-public class ForumListAdapter extends ArrayAdapter<ForumListItem> {
+public class ForumListAdapter extends
+		RecyclerView.Adapter<ForumListAdapter.ForumViewHolder> {
 
-	private final int pad;
+	private SortedList<ForumListItem> forums = new SortedList<>(
+			ForumListItem.class, new SortedList.Callback<ForumListItem>() {
+		@Override
+		public int compare(ForumListItem a, ForumListItem b) {
+			if (a == b) return 0;
+			// The forum with the newest message comes first
+			long aTime = a.getTimestamp(), bTime = b.getTimestamp();
+			if (aTime > bTime) return -1;
+			if (aTime < bTime) return 1;
+			// Break ties by forum name
+			String aName = a.getForum().getName();
+			String bName = b.getForum().getName();
+			return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
+		}
+
+		@Override
+		public void onInserted(int position, int count) {
+			notifyItemRangeInserted(position, count);
+		}
+
+		@Override
+		public void onRemoved(int position, int count) {
+			notifyItemRangeRemoved(position, count);
+		}
+
+		@Override
+		public void onMoved(int fromPosition, int toPosition) {
+			notifyItemMoved(fromPosition, toPosition);
+		}
+
+		@Override
+		public void onChanged(int position, int count) {
+			notifyItemRangeChanged(position, count);
+		}
+
+		@Override
+		public boolean areContentsTheSame(ForumListItem a, ForumListItem b) {
+			return a.getForum().equals(b.getForum()) &&
+					a.getTimestamp() == b.getTimestamp() &&
+					a.getUnreadCount() == b.getUnreadCount();
+		}
+
+		@Override
+		public boolean areItemsTheSame(ForumListItem a, ForumListItem b) {
+			return a.getForum().equals(b.getForum());
+		}
+	});
+	private final Context ctx;
 
 	public ForumListAdapter(Context ctx) {
-		super(ctx, android.R.layout.simple_expandable_list_item_1,
-				new ArrayList<ForumListItem>());
-		pad = LayoutUtils.getPadding(ctx);
+		this.ctx = ctx;
 	}
 
 	@Override
-	public View getView(int position, View convertView, ViewGroup parent) {
-		ForumListItem item = getItem(position);
-		Context ctx = getContext();
-		Resources res = ctx.getResources();
+	public ForumViewHolder onCreateViewHolder(ViewGroup parent,
+			int viewType) {
 
-		LinearLayout layout = new LinearLayout(ctx);
-		layout.setOrientation(HORIZONTAL);
+		View v = LayoutInflater.from(ctx)
+				.inflate(R.layout.list_item_forum, parent, false);
+		return new ForumViewHolder(v);
+	}
+
+	@Override
+	public void onBindViewHolder(ForumViewHolder ui, int position) {
+		final ForumListItem item = getItem(position);
+
+		// TODO add avatar. See #337
+
+		// Forum Name
+		ui.name.setText(item.getForum().getName());
+
+		// Unread Count
 		int unread = item.getUnreadCount();
-		if (unread > 0)
-			layout.setBackgroundColor(res.getColor(R.color.unread_background));
-
-		TextView name = new TextView(ctx);
-		name.setLayoutParams(WRAP_WRAP_1);
-		name.setTextSize(18);
-		name.setSingleLine();
-		name.setEllipsize(END);
-		name.setPadding(pad, pad, pad, pad);
-		String forumName = item.getForum().getName();
-		if (unread > 0) name.setText(forumName + " (" + unread + ")");
-		else name.setText(forumName);
-		layout.addView(name);
-
-		if (item.isEmpty()) {
-			TextView noPosts = new TextView(ctx);
-			noPosts.setPadding(pad, 0, pad, pad);
-			noPosts.setTextColor(res.getColor(R.color.no_posts));
-			noPosts.setText(R.string.no_forum_posts);
-			layout.addView(noPosts);
+		if (unread > 0) {
+			ui.unread.setText(ctx.getResources()
+					.getQuantityString(R.plurals.unread_posts, unread, unread));
+			ui.unread.setTextColor(
+					ContextCompat.getColor(ctx, R.color.briar_button_positive));
 		} else {
-			TextView date = new TextView(ctx);
-			date.setPadding(pad, 0, pad, pad);
-			long timestamp = item.getTimestamp();
-			date.setText(DateUtils.getRelativeTimeSpanString(ctx, timestamp));
-			layout.addView(date);
+			ui.unread.setText(ctx.getString(R.string.no_unread_posts));
+			ui.unread.setTextColor(
+					ContextCompat.getColor(ctx, R.color.briar_text_secondary));
 		}
 
-		return layout;
+		// Date or "No Posts"
+		if (item.isEmpty()) {
+			ui.date.setVisibility(View.GONE);
+		} else {
+			long timestamp = item.getTimestamp();
+			ui.date.setText(
+					DateUtils.getRelativeTimeSpanString(ctx, timestamp));
+			ui.date.setVisibility(View.VISIBLE);
+		}
+
+		// Open Forum on Click
+		ui.layout.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				Intent i = new Intent(ctx, ForumActivity.class);
+				Forum f = item.getForum();
+				i.putExtra(GROUP_ID, f.getId().getBytes());
+				i.putExtra(FORUM_NAME, f.getName());
+				ctx.startActivity(i);
+			}
+		});
 	}
+
+	@Override
+	public int getItemCount() {
+		return forums.size();
+	}
+
+	public ForumListItem getItem(int position) {
+		return forums.get(position);
+	}
+
+	@Nullable
+	public ForumListItem getItem(GroupId g) {
+		for (int i = 0; i < forums.size(); i++) {
+			ForumListItem item = forums.get(i);
+			if (item.getForum().getGroup().getId().equals(g)) {
+				return item;
+			}
+		}
+		return null;
+	}
+
+	public void addAll(Collection<ForumListItem> items) {
+		forums.addAll(items);
+	}
+
+	public void updateItem(ForumListItem item) {
+		ForumListItem oldItem = getItem(item.getForum().getGroup().getId());
+		int position = forums.indexOf(oldItem);
+		forums.updateItemAt(position, item);
+	}
+
+	public void remove(ForumListItem item) {
+		forums.remove(item);
+	}
+
+	public void clear() {
+		forums.clear();
+	}
+
+	public boolean isEmpty() {
+		return forums.size() == 0;
+	}
+
+	protected static class ForumViewHolder extends RecyclerView.ViewHolder {
+
+		public final ViewGroup layout;
+		public final TextView name;
+		public final TextView unread;
+		public final TextView date;
+
+		public ForumViewHolder(View v) {
+			super(v);
+
+			layout = (ViewGroup) v;
+			name = (TextView) v.findViewById(R.id.forumNameView);
+			unread = (TextView) v.findViewById(R.id.unreadView);
+			date = (TextView) v.findViewById(R.id.dateView);
+		}
+	}
+
 }

briar-android/src/org/briarproject/android/forum/ForumListFragment.java

@@ -5,25 +5,23 @@ import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.design.widget.Snackbar;
 import android.support.v4.content.ContextCompat;
+import android.support.v7.widget.LinearLayoutManager;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.AdapterView;
-import android.widget.LinearLayout;
-import android.widget.ListView;
-import android.widget.TextView;
 
 import org.briarproject.R;
 import org.briarproject.android.AndroidComponent;
 import org.briarproject.android.fragment.BaseEventFragment;
-import org.briarproject.android.util.ListLoadingProgressBar;
+import org.briarproject.android.util.BriarRecyclerView;
 import org.briarproject.api.db.DbException;
 import org.briarproject.api.db.NoSuchGroupException;
 import org.briarproject.api.event.ContactRemovedEvent;
 import org.briarproject.api.event.Event;
+import org.briarproject.api.event.ForumInvitationReceivedEvent;
 import org.briarproject.api.event.GroupAddedEvent;
 import org.briarproject.api.event.GroupRemovedEvent;
 import org.briarproject.api.event.MessageValidatedEvent;
@@ -34,26 +32,18 @@ import org.briarproject.api.forum.ForumSharingManager;
 import org.briarproject.api.sync.ClientId;
 import org.briarproject.api.sync.GroupId;
 
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
 import static android.support.design.widget.Snackbar.LENGTH_INDEFINITE;
-import static android.view.Gravity.CENTER;
-import static android.view.Gravity.CENTER_HORIZONTAL;
-import static android.view.View.GONE;
-import static android.view.View.VISIBLE;
-import static android.widget.LinearLayout.VERTICAL;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.android.BriarActivity.GROUP_ID;
-import static org.briarproject.android.forum.ForumActivity.FORUM_NAME;
-import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
-import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP_1;
 
 public class ForumListFragment extends BaseEventFragment implements
-		AdapterView.OnItemClickListener, View.OnClickListener {
+		View.OnClickListener {
 
 	public final static String TAG = "ForumListFragment";
 
@@ -69,10 +59,8 @@ public class ForumListFragment extends BaseEventFragment implements
 		return fragment;
 	}
 
-	private TextView empty = null;
-	private ForumListAdapter adapter = null;
-	private ListView list = null;
-	private ListLoadingProgressBar loading = null;
+	private BriarRecyclerView list;
+	private ForumListAdapter adapter;
 	private Snackbar snackbar;
 
 	// Fields that are accessed from background threads must be volatile
@@ -86,32 +74,24 @@ public class ForumListFragment extends BaseEventFragment implements
 
 		setHasOptionsMenu(true);
 
-		LinearLayout layout = new LinearLayout(getContext());
-		layout.setLayoutParams(MATCH_MATCH);
-		layout.setOrientation(VERTICAL);
-		layout.setGravity(CENTER_HORIZONTAL);
+		View contentView =
+				inflater.inflate(R.layout.fragment_forum_list, container,
+						false);
 
-		empty = new TextView(getContext());
-		empty.setLayoutParams(MATCH_WRAP_1);
-		empty.setGravity(CENTER);
-		empty.setTextSize(18);
-		empty.setText(R.string.no_forums);
-		empty.setVisibility(GONE);
-		layout.addView(empty);
+		adapter = new ForumListAdapter(getActivity());
 
-		adapter = new ForumListAdapter(getContext());
-		list = new ListView(getContext());
-		list.setLayoutParams(MATCH_WRAP_1);
+		list = (BriarRecyclerView) contentView.findViewById(R.id.forumList);
+		list.setLayoutManager(new LinearLayoutManager(getActivity()));
 		list.setAdapter(adapter);
-		list.setOnItemClickListener(this);
-		list.setVisibility(GONE);
-		layout.addView(list);
+		list.setEmptyText(getString(R.string.no_forums));
 
-		// Show a progress bar while the list is loading
-		loading = new ListLoadingProgressBar(getContext());
-		layout.addView(loading);
+		snackbar = Snackbar.make(contentView, "", LENGTH_INDEFINITE);
+		snackbar.getView().setBackgroundResource(R.color.briar_primary);
+		snackbar.setAction(R.string.show_forums, this);
+		snackbar.setActionTextColor(ContextCompat
+				.getColor(getContext(), R.color.briar_button_positive));
 
-		return layout;
+		return contentView;
 	}
 
 	@Override
@@ -128,13 +108,15 @@ public class ForumListFragment extends BaseEventFragment implements
 	public void onResume() {
 		super.onResume();
 
-		snackbar = Snackbar.make(getView(), "", LENGTH_INDEFINITE);
-		snackbar.getView().setBackgroundResource(R.color.briar_primary);
-		snackbar.setAction(R.string.show_forums, this);
-		snackbar.setActionTextColor(ContextCompat
-				.getColor(getContext(), R.color.briar_button_positive));
+		loadForumHeaders();
+		loadAvailableForums();
+	}
 
-		loadHeaders();
+	@Override
+	public void onPause() {
+		super.onPause();
+
+		adapter.clear();
 	}
 
 	@Override
@@ -157,30 +139,26 @@ public class ForumListFragment extends BaseEventFragment implements
 		}
 	}
 
-	private void loadHeaders() {
-		clearHeaders();
+	private void loadForumHeaders() {
 		listener.runOnDbThread(new Runnable() {
 			public void run() {
 				try {
+					// load forums
 					long now = System.currentTimeMillis();
-					boolean displayedHeaders = false;
+					Collection<ForumListItem> forums = new ArrayList<>();
 					for (Forum f : forumManager.getForums()) {
 						try {
 							Collection<ForumPostHeader> headers =
 									forumManager.getPostHeaders(f.getId());
-							displayHeaders(f, headers);
-							displayedHeaders = true;
+							forums.add(new ForumListItem(f, headers));
 						} catch (NoSuchGroupException e) {
 							// Continue
 						}
 					}
-					int available =
-							forumSharingManager.getAvailableForums().size();
+					displayForumHeaders(forums);
 					long duration = System.currentTimeMillis() - now;
 					if (LOG.isLoggable(INFO))
 						LOG.info("Full load took " + duration + " ms");
-					if (!displayedHeaders) displayEmpty();
-					displayAvailable(available);
 				} catch (DbException e) {
 					if (LOG.isLoggable(WARNING))
 						LOG.log(WARNING, e.toString(), e);
@@ -189,45 +167,35 @@ public class ForumListFragment extends BaseEventFragment implements
 		});
 	}
 
-	private void clearHeaders() {
+	private void displayForumHeaders(final Collection<ForumListItem> forums) {
 		listener.runOnUiThread(new Runnable() {
 			public void run() {
-				empty.setVisibility(GONE);
-				list.setVisibility(GONE);
-				snackbar.dismiss();
-				loading.setVisibility(VISIBLE);
-				adapter.clear();
+				if (forums.size() > 0) adapter.addAll(forums);
+				else list.showData();
 			}
 		});
 	}
 
-	private void displayHeaders(final Forum f,
-			final Collection<ForumPostHeader> headers) {
-		listener.runOnUiThread(new Runnable() {
+	private void loadAvailableForums() {
+		listener.runOnDbThread(new Runnable() {
 			public void run() {
-				list.setVisibility(VISIBLE);
-				loading.setVisibility(GONE);
-				// Remove the old item, if any
-				ForumListItem item = findForum(f.getId());
-				if (item != null) adapter.remove(item);
-				// Add a new item
-				adapter.add(new ForumListItem(f, headers));
-				adapter.sort(ForumListItemComparator.INSTANCE);
-				selectFirstUnread();
+				try {
+					long now = System.currentTimeMillis();
+					int available =
+							forumSharingManager.getAvailableForums().size();
+					long duration = System.currentTimeMillis() - now;
+					if (LOG.isLoggable(INFO))
+						LOG.info("Loading available took " + duration + " ms");
+					displayAvailableForums(available);
+				} catch (DbException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				}
 			}
 		});
 	}
 
-	private void displayEmpty() {
-		listener.runOnUiThread(new Runnable() {
-			public void run() {
-				empty.setVisibility(VISIBLE);
-				loading.setVisibility(GONE);
-			}
-		});
-	}
-
-	private void displayAvailable(final int availableCount) {
+	private void displayAvailableForums(final int availableCount) {
 		listener.runOnUiThread(new Runnable() {
 			public void run() {
 				if (availableCount == 0) {
@@ -242,42 +210,21 @@ public class ForumListFragment extends BaseEventFragment implements
 		});
 	}
 
-	private ForumListItem findForum(GroupId g) {
-		int count = adapter.getCount();
-		for (int i = 0; i < count; i++) {
-			ForumListItem item = adapter.getItem(i);
-			if (item.getForum().getId().equals(g)) return item;
-		}
-		return null; // Not found
-	}
-
-	private void selectFirstUnread() {
-		int firstUnread = -1, count = adapter.getCount();
-		for (int i = 0; i < count; i++) {
-			if (adapter.getItem(i).getUnreadCount() > 0) {
-				firstUnread = i;
-				break;
-			}
-		}
-		if (firstUnread == -1) list.setSelection(count - 1);
-		else list.setSelection(firstUnread);
-	}
-
 	public void eventOccurred(Event e) {
 		if (e instanceof ContactRemovedEvent) {
-			LOG.info("Contact removed, reloading");
-			loadAvailable();
+			LOG.info("Contact removed, reloading available forums");
+			loadAvailableForums();
 		} else if (e instanceof GroupAddedEvent) {
 			GroupAddedEvent g = (GroupAddedEvent) e;
 			if (g.getGroup().getClientId().equals(forumManager.getClientId())) {
-				LOG.info("Forum added, reloading");
-				loadHeaders();
+				LOG.info("Forum added, reloading forums");
+				loadForumHeaders();
 			}
 		} else if (e instanceof GroupRemovedEvent) {
 			GroupRemovedEvent g = (GroupRemovedEvent) e;
 			if (g.getGroup().getClientId().equals(forumManager.getClientId())) {
-				LOG.info("Forum removed, reloading");
-				loadHeaders();
+				LOG.info("Forum removed, removing from list");
+				removeForum(g.getGroup().getId());
 			}
 		} else if (e instanceof MessageValidatedEvent) {
 			MessageValidatedEvent m = (MessageValidatedEvent) e;
@@ -285,17 +232,15 @@ public class ForumListFragment extends BaseEventFragment implements
 				ClientId c = m.getClientId();
 				if (c.equals(forumManager.getClientId())) {
 					LOG.info("Forum post added, reloading");
-					loadHeaders(m.getMessage().getGroupId());
-				} else if (!m.isLocal()
-						&& c.equals(forumSharingManager.getClientId())) {
-					LOG.info("Available forums updated, reloading");
-					loadAvailable();
+					loadForumHeaders(m.getMessage().getGroupId());
 				}
 			}
+		} else if (e instanceof ForumInvitationReceivedEvent) {
+			loadAvailableForums();
 		}
 	}
 
-	private void loadHeaders(final GroupId g) {
+	private void loadForumHeaders(final GroupId g) {
 		listener.runOnDbThread(new Runnable() {
 			public void run() {
 				try {
@@ -306,9 +251,7 @@ public class ForumListFragment extends BaseEventFragment implements
 					long duration = System.currentTimeMillis() - now;
 					if (LOG.isLoggable(INFO))
 						LOG.info("Partial load took " + duration + " ms");
-					displayHeaders(f, headers);
-				} catch (NoSuchGroupException e) {
-					removeForum(g);
+					updateForum(new ForumListItem(f, headers));
 				} catch (DbException e) {
 					if (LOG.isLoggable(WARNING))
 						LOG.log(WARNING, e.toString(), e);
@@ -317,38 +260,21 @@ public class ForumListFragment extends BaseEventFragment implements
 		});
 	}
 
+	private void updateForum(final ForumListItem item) {
+		listener.runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				adapter.updateItem(item);
+			}
+		});
+	}
+
 	private void removeForum(final GroupId g) {
 		listener.runOnUiThread(new Runnable() {
+			@Override
 			public void run() {
-				ForumListItem item = findForum(g);
-				if (item != null) {
-					adapter.remove(item);
-					if (adapter.isEmpty()) {
-						empty.setVisibility(VISIBLE);
-						list.setVisibility(GONE);
-					} else {
-						selectFirstUnread();
-					}
-				}
-			}
-		});
-	}
-
-	private void loadAvailable() {
-		listener.runOnDbThread(new Runnable() {
-			public void run() {
-				try {
-					long now = System.currentTimeMillis();
-					int available =
-							forumSharingManager.getAvailableForums().size();
-					long duration = System.currentTimeMillis() - now;
-					if (LOG.isLoggable(INFO))
-						LOG.info("Loading available took " + duration + " ms");
-					displayAvailable(available);
-				} catch (DbException e) {
-					if (LOG.isLoggable(WARNING))
-						LOG.log(WARNING, e.toString(), e);
-				}
+				ForumListItem item = adapter.getItem(g);
+				if (item != null) adapter.remove(item);
 			}
 		});
 	}
@@ -358,13 +284,4 @@ public class ForumListFragment extends BaseEventFragment implements
 		startActivity(new Intent(getContext(), AvailableForumsActivity.class));
 	}
 
-	public void onItemClick(AdapterView<?> parent, View view, int position,
-			long id) {
-		Intent i = new Intent(getContext(), ForumActivity.class);
-		Forum f = adapter.getItem(position).getForum();
-		i.putExtra(GROUP_ID, f.getId().getBytes());
-		i.putExtra(FORUM_NAME, f.getName());
-		startActivity(i);
-	}
-
 }

briar-android/src/org/briarproject/android/forum/ForumListItemComparator.java

@@ -1,21 +0,0 @@
-package org.briarproject.android.forum;
-
-import java.util.Comparator;
-
-public class ForumListItemComparator implements Comparator<ForumListItem> {
-
-	public static final ForumListItemComparator INSTANCE =
-			new ForumListItemComparator();
-
-	public int compare(ForumListItem a, ForumListItem b) {
-		if (a == b) return 0;
-		// The forum with the newest message comes first
-		long aTime = a.getTimestamp(), bTime = b.getTimestamp();
-		if (aTime > bTime) return -1;
-		if (aTime < bTime) return 1;
-		// Break ties by forum name
-		String aName = a.getForum().getName();
-		String bName = b.getForum().getName();
-		return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
-	}
-}