Simple-Multiparty-Java

Simple Multiparty

This app shows how to implement a simple video call application with several clients. It demonstrates how to enable/disable audio and video as well as swap the camera.

Subcribing to multiple streams

Signaling sample subscribed to only one stream. In a multiparty video audio call there are multiple streams.

@Override
public void onStreamReceived(Session session, Stream stream) {
    final Subscriber subscriber = new Subscriber.Builder(MainActivity.this, stream).build();
    session.subscribe(subscriber);
    addSubscriber(subscriber);
}

This simple multiparty app is able to handle a maximum of four subscribers. Once a new stream is received, The MainActivity class creates a new Subscriber object and subscribes the Session object to it. The Subscriber stream is then rendered to the screen (as it did before).

Adding user interface controls

This sample shows how you can add user interface controls for the following:

• Turning a publisher's audio stream on and off
• Swapping the publisher's camera

When the user taps the enable/disable audio button for the publisher, the following method of The MainActivity class is invoked:

toggleAudio.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (publisher == null) {
            return;
        }
        if (isChecked) {
            publisher.setPublishAudio(true);
        } else {
            publisher.setPublishAudio(false);
        }
    }
});

The setPublishAudio(boolean publishAudio) method of a Publisher object toggles its audio on or off, based on a Boolean parameter.

When the user taps the enable/disable video button for the publisher, the following method of The MainActivity class is invoked:

toggleVideo.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (publisher == null) {
            return;
        }
        if (isChecked) {
            publisher.setPublishVideo(true);
        } else {
            publisher.setPublishVideo(false);
        }
    }
});

The setPublishVideo(boolean publishAudio) method of a Publisher object toggles its video on or off, based on a Boolean parameter.

When the user taps the swapCamera button, the following method of the OpenTokUI class is invoked:

swapCamera.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        if (publisher == null) {
            return;
        }

        publisher.cycleCamera();
    }
});

The swapCamera method of a Publisher object changes the camera used to the next available camera on the device (if there is one).

Note: For the sake of simplicity, we have set a maximum of 4 subscribers for this application.

See below:

private final int MAX_NUM_SUBSCRIBERS = 4;

Further Reading

• Review other sample projects
• Read more about OpenTok Android SDK