add an listener for the muc roster update.

this is for the ConferenceDetailsActivity to show
precence updates immediately.

src/main/java/eu/siacs/conversations/parser/PresenceParser.java

@@ -31,6 +31,8 @@ public class PresenceParser extends AbstractParser implements
 			mXmppConnectionService.getAvatarService().clear(conversation);
 			if (before != mucOptions.online() || (mucOptions.online() && count != mucOptions.getUsers().size())) {
 				mXmppConnectionService.updateConversationUi();
+			} else if (mucOptions.online()) {
+				mXmppConnectionService.updateMucRosterUi();
 			}
 		}
 	}

src/main/java/eu/siacs/conversations/services/XmppConnectionService.java

@@ -212,6 +212,8 @@ public class XmppConnectionService extends Service {
 	private Integer accountChangedListenerCount = 0;
 	private OnRosterUpdate mOnRosterUpdate = null;
 	private Integer rosterChangedListenerCount = 0;
+	private OnMucRosterUpdate mOnMucRosterUpdate = null;
+	private Integer mucRosterChangedListenerCount = 0;
 	private SecureRandom mRandom;
 	private FileObserver fileObserver = new FileObserver(
 			FileBackend.getConversationsImageDirectory()) {
@@ -1116,6 +1118,13 @@ public class XmppConnectionService extends Service {
 				removedListener = true;
 			}
 		}
+		synchronized (this.mucRosterChangedListenerCount) {
+			if (this.mOnMucRosterUpdate != null) {
+				this.mOnMucRosterUpdate = null;
+				this.mucRosterChangedListenerCount = 0;
+				removedListener = true;
+			}
+		}
 		if (removedListener) {
 			final String msg = "removed stale listeners";
 			Log.d(Config.LOGTAG, msg);
@@ -1217,6 +1226,29 @@ public class XmppConnectionService extends Service {
 		}
 	}
 
+	public void setOnMucRosterUpdateListener(OnMucRosterUpdate listener) {
+		synchronized (this.mucRosterChangedListenerCount) {
+			if (checkListeners()) {
+				switchToForeground();
+			}
+			this.mOnMucRosterUpdate = listener;
+			this.mucRosterChangedListenerCount++;
+		}
+	}
+
+	public void removeOnMucRosterUpdateListener() {
+		synchronized (this.mucRosterChangedListenerCount) {
+			this.mucRosterChangedListenerCount--;
+			if (this.mucRosterChangedListenerCount <= 0) {
+				this.mucRosterChangedListenerCount = 0;
+				this.mOnMucRosterUpdate = null;
+				if (checkListeners()) {
+					switchToBackground();
+				}
+			}
+		}
+	}
+
 	private boolean checkListeners() {
 		return (this.mOnAccountUpdate == null
 				&& this.mOnConversationUpdate == null && this.mOnRosterUpdate == null);
@@ -1928,6 +1960,12 @@ public class XmppConnectionService extends Service {
 		}
 	}
 
+	public void updateMucRosterUi() {
+		if (mOnMucRosterUpdate != null) {
+			mOnMucRosterUpdate.onMucRosterUpdate();
+		}
+	}
+
 	public Account findAccountByJid(final Jid accountJid) {
 		for (Account account : this.accounts) {
 			if (account.getJid().toBareJid().equals(accountJid.toBareJid())) {
@@ -2125,6 +2163,10 @@ public class XmppConnectionService extends Service {
 		public void onRosterUpdate();
 	}
 
+	public interface OnMucRosterUpdate {
+		public void onMucRosterUpdate();
+	}
+
 	private interface OnConferenceOptionsPushed {
 		public void onPushSucceeded();
 		public void onPushFailed();

src/main/java/eu/siacs/conversations/ui/ConferenceDetailsActivity.java

@@ -30,10 +30,11 @@ import eu.siacs.conversations.crypto.PgpEngine;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.Conversation;
 import eu.siacs.conversations.entities.MucOptions.User;
+import eu.siacs.conversations.services.XmppConnectionService.OnMucRosterUpdate;
 import eu.siacs.conversations.services.XmppConnectionService.OnConversationUpdate;
 import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 
-public class ConferenceDetailsActivity extends XmppActivity implements OnConversationUpdate {
+public class ConferenceDetailsActivity extends XmppActivity implements OnConversationUpdate, OnMucRosterUpdate {
 	public static final String ACTION_VIEW_MUC = "view_muc";
 	private Conversation mConversation;
 	private OnClickListener inviteListener = new OnClickListener() {
@@ -96,6 +97,17 @@ public class ConferenceDetailsActivity extends XmppActivity implements OnConvers
 		});
 	}
 
+	@Override
+	public void onMucRosterUpdate() {
+		runOnUiThread(new Runnable() {
+
+			@Override
+			public void run() {
+				populateView();
+			}
+		});
+	}
+
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);

src/main/java/eu/siacs/conversations/ui/XmppActivity.java

@@ -241,6 +241,9 @@ public abstract class XmppActivity extends Activity {
 		if (this instanceof XmppConnectionService.OnRosterUpdate) {
 			this.xmppConnectionService.setOnRosterUpdateListener((XmppConnectionService.OnRosterUpdate) this);
 		}
+		if (this instanceof XmppConnectionService.OnMucRosterUpdate) {
+			this.xmppConnectionService.setOnMucRosterUpdateListener((XmppConnectionService.OnMucRosterUpdate) this);
+		}
 	}
 
 	protected void unregisterListeners() {
@@ -253,6 +256,9 @@ public abstract class XmppActivity extends Activity {
 		if (this instanceof XmppConnectionService.OnRosterUpdate) {
 			this.xmppConnectionService.removeOnRosterUpdateListener();
 		}
+		if (this instanceof XmppConnectionService.OnMucRosterUpdate) {
+			this.xmppConnectionService.removeOnMucRosterUpdateListener();
+		}
 	}
 
 	public boolean onOptionsItemSelected(MenuItem item) {