private void unsubscribeFromStream(Stream stream) {
   mStreams.remove(stream);
   if (mSubscriber.getStream().getStreamId().equals(stream.getStreamId())) {
     mSubscriberViewContainer.removeView(mSubscriber.getView());
     mSubscriber = null;
     if (!mStreams.isEmpty()) {
       subscribeToStream(mStreams.get(0));
     }
   }
 }