android: add ability to keep track of the current ongoing conference

android/sdk/src/main/java/org/jitsi/meet/sdk/ExternalAPIModule.java

@@ -67,6 +67,9 @@ class ExternalAPIModule
      */
     @ReactMethod
     public void sendEvent(String name, ReadableMap data, String scope) {
+        // Keep track of the current ongoing conference.
+        OngoingConferenceTracker.onExternalAPIEvent(name, data);
+
         // The JavaScript App needs to provide uniquely identifying information
         // to the native ExternalAPI module so that the latter may match the
         // former to the native BaseReactView which hosts it.

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeet.java

@@ -36,6 +36,15 @@ public class JitsiMeet {
         defaultConferenceOptions = options;
     }
 
+    /**
+     * Returns the current conference URL as a string.
+     *
+     * @return the current conference URL.
+     */
+    public static String getCurrentConference() {
+        return OngoingConferenceTracker.getCurrentConference();
+    }
+
     /**
      * Helper to get the default conference options as a {@link Bundle}.
      *

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeetView.java

@@ -29,7 +29,8 @@ import java.lang.reflect.Method;
 import java.util.Map;
 
 
-public class JitsiMeetView extends BaseReactView<JitsiMeetViewListener> {
+public class JitsiMeetView extends BaseReactView<JitsiMeetViewListener>
+        implements OngoingConferenceTracker.OngoingConferenceListener {
 
     /**
      * The {@code Method}s of {@code JitsiMeetViewListener} by event name i.e.
@@ -106,6 +107,14 @@ public class JitsiMeetView extends BaseReactView<JitsiMeetViewListener> {
         if (!(context instanceof JitsiMeetActivityInterface)) {
             throw new RuntimeException("Enclosing Activity must implement JitsiMeetActivityInterface");
         }
+
+        OngoingConferenceTracker.addListener(this);
+    }
+
+    @Override
+    public void dispose() {
+        OngoingConferenceTracker.removeListener(this);
+        super.dispose();
     }
 
     /**
@@ -173,27 +182,17 @@ public class JitsiMeetView extends BaseReactView<JitsiMeetViewListener> {
     }
 
     /**
-     * The internal processing for the URL of the current conference set on the
-     * associated {@link JitsiMeetView}.
-     *
-     * @param eventName the name of the external API event to be processed
-     * @param eventData the details/specifics of the event to process determined
-     * by/associated with the specified {@code eventName}.
+     * Handler for {@link OngoingConferenceTracker} events.
+     * @param conferenceUrl
      */
-    private void maybeSetViewURL(String eventName, ReadableMap eventData) {
-        String url = eventData.hasKey("url") ? eventData.getString("url") : null;
-
-        switch(eventName) {
-        case "CONFERENCE_WILL_JOIN":
-            this.url = url;
-            break;
-
-        case "CONFERENCE_TERMINATED":
-            if (url != null && url.equals(this.url)) {
-                this.url = null;
-            }
-            break;
-        }
+    @Override
+    public void onCurrentConferenceChanged(String conferenceUrl) {
+        // This property was introduced in order to address
+        // an exception in the Picture-in-Picture functionality which arose
+        // because of delays related to bridging between JavaScript and Java. To
+        // reduce these delays do not wait for the call to be transferred to the
+        // UI thread.
+        this.url = conferenceUrl;
     }
 
     /**
@@ -205,13 +204,6 @@ public class JitsiMeetView extends BaseReactView<JitsiMeetViewListener> {
      */
     @Override
     protected void onExternalAPIEvent(String name, ReadableMap data) {
-        // XXX The JitsiMeetView property URL was introduced in order to address
-        // an exception in the Picture-in-Picture functionality which arose
-        // because of delays related to bridging between JavaScript and Java. To
-        // reduce these delays do not wait for the call to be transferred to the
-        // UI thread.
-        maybeSetViewURL(name, data);
-
         onExternalAPIEvent(LISTENER_METHODS, name, data);
     }
 }

android/sdk/src/main/java/org/jitsi/meet/sdk/OngoingConferenceTracker.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright @ 2019-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jitsi.meet.sdk;
+
+import com.facebook.react.bridge.ReadableMap;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+
+class OngoingConferenceTracker {
+    private static final Collection<OngoingConferenceListener> listeners =
+        Collections.synchronizedSet(new HashSet<OngoingConferenceListener>());
+    private static String currentConference;
+
+    static synchronized String getCurrentConference() {
+        return currentConference;
+    }
+
+    static synchronized void onExternalAPIEvent(String name, ReadableMap data) {
+        if (!data.hasKey("url")) {
+            return;
+        }
+
+        String url = data.getString("url");
+
+        switch(name) {
+            case "CONFERENCE_WILL_JOIN":
+                currentConference = url;
+                updateCurrentConference();
+                break;
+
+            case "CONFERENCE_TERMINATED":
+                if (currentConference != null && url.equals(currentConference)) {
+                    currentConference = null;
+                    updateCurrentConference();
+                }
+                break;
+        }
+    }
+
+    static void addListener(OngoingConferenceListener listener) {
+        listeners.add(listener);
+    }
+
+    static void removeListener(OngoingConferenceListener listener) {
+        listeners.remove(listener);
+    }
+
+    private static synchronized void updateCurrentConference() {
+        for (OngoingConferenceListener listener: listeners) {
+            listener.onCurrentConferenceChanged(currentConference);
+        }
+    }
+
+    public interface OngoingConferenceListener {
+        void onCurrentConferenceChanged(String conferenceUrl);
+    }
+}