Update phone detection sample (#388)

Author: igorwojda

Phone-Call-Detection/README.md

@@ -1,12 +1,13 @@
 # Phone Call Detection
 
-This application provides a Video Chat tutorial for Android. Upon deploying this sample application, you should be
-able to have two-way audio and video communication using OpenTok. You will be notified about incoming and outgoing
-phone calls (happening during the video call).
+This application provides a sample demonstrating phone calls detection.
+Upon deploying this sample application, you should be able to have two-way audio and video communication using OpenTok.
+Audio and video streams published from device to OpenTok session will be halted for the duration of ongoing phone call.
 
 Main features:
 * Create 2-way OpenTok video call
-* Detect incoming and outgoing native phone calls (while being on video call)
+* Detect incoming and outgoing native phone calls
+* Disable device video/video while being onCallStateChanged the phone call
 
 # Configure the app 
 Open the `OpenTokConfig` file and configure the `API_KEY`, `SESSION_ID`, and `TOKEN` variables. You can obtain these values from your [TokBox account](https://tokbox.com/account/#/).

Phone-Call-Detection/app/src/main/java/com/tokbox/sample/phonecalldetection/MainActivity.java

@@ -53,6 +53,11 @@ public void onError(PublisherKit publisherKit, OpentokError opentokError) {
         public void onConnected(Session session) {
             Log.d(TAG, "onConnected: Connected to session: " + session.getSessionId());
 
+            startVideoPublish(session);
+            registerPhoneListener();
+        }
+
+        private void startVideoPublish(Session session) {
             publisher = new Publisher.Builder(MainActivity.this).build();
             publisher.setPublisherListener(publisherListener);
             publisher.getRenderer().setStyle(BaseVideoRenderer.STYLE_VIDEO_SCALE, BaseVideoRenderer.STYLE_VIDEO_FILL);
@@ -66,6 +71,11 @@ public void onConnected(Session session) {
             session.publish(publisher);
         }
 
+        private void registerPhoneListener() {
+            TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
+            telephonyManager.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
+        }
+
         @Override
         public void onDisconnected(Session session) {
             Log.d(TAG, "onDisconnected: Disconnected from session: " + session.getSessionId());
@@ -125,7 +135,8 @@ public void onCallStateChanged(int state, String incomingNumber) {
 
             switch (state) {
                 case TelephonyManager.CALL_STATE_IDLE: //Initial state
-                    Log.d("onCallStateChanged", "CALL_STATE_IDLE");
+                    publisher.setPublishVideo(true);
+                    publisher.setPublishAudio(true);
                     break;
 
                 case TelephonyManager.CALL_STATE_RINGING: // Incoming call Ringing
@@ -134,6 +145,8 @@ public void onCallStateChanged(int state, String incomingNumber) {
 
                 case TelephonyManager.CALL_STATE_OFFHOOK: // Outgoing Call | Accepted incoming call
                     Log.d("onCallStateChanged", "CALL_STATE_OFFHOOK");
+                    publisher.setPublishVideo(false);
+                    publisher.setPublishAudio(false);
                     break;
 
                 default:
@@ -152,9 +165,6 @@ protected void onCreate(Bundle savedInstanceState) {
         publisherViewContainer = findViewById(R.id.publisher_container);
         subscriberViewContainer = findViewById(R.id.subscriber_container);
 
-        TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
-        telephonyManager.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
-
         requestPermissions();
     }