Due to the breaking changes in Android WebRTC client's example, I'm looking for the code-example which shows how to add and work with DataChannel in Android. I need to just send "Hello Worlds" via DataChannel between 2 Android devices. Here's the old code:
It uses some classes and interfaces which don't exist in the new version anymore.
So how can I add support of DataChannel to my Android WebRTC application, send and receive a text through it?
I added DataChannel in a project with an older version of webrtc. I looked at the most up to date classes and it seems the methods and callbacks are still there, so hopefully it will work for you.
Changes to PeerConnectionClient:
Create DataChannel in createPeerConnectionInternal after isInitiator = false;:
DataChannel.Init dcInit = new DataChannel.Init();
dcInit.id = 1;
dataChannel = pc.createDataChannel("1", dcInit);;
dataChannel.registerObserver(new DcObserver());
Changes to onDataChannel:
@Override
public void onDataChannel(final DataChannel dc) {
Log.d(TAG, "onDataChannel");
executor.execute(new Runnable() {
@Override
public void run() {
dataChannel = dc;
String channelName = dataChannel.label();
dataChannel.registerObserver(new DcObserver());
}
});
}
Add the channel observer:
private class DcObserver implements DataChannel.Observer {
@Override
public void onMessage(final DataChannel.Buffer buffer) {
ByteBuffer data = buffer.data;
byte[] bytes = new byte[data.remaining()];
data.get(bytes);
final String command = new String(bytes);
executor.execute(new Runnable() {
public void run() {
events.onReceivedData(command);
}
});
}
@Override
public void onStateChange() {
Log.d(TAG, "DataChannel: onStateChange: " + dataChannel.state());
}
}
I added onReceivedDataevents to PeerConnectionEvents interface and all the events are implemented in the CallActivity so I handle the data received on the channel from there.
To send data, from CallActivity:
public void sendData(final String data) {
ByteBuffer buffer = ByteBuffer.wrap(data.getBytes());
peerConnectionClient.getPCDataChannel().send(new DataChannel.Buffer(buffer, false));
}
I only took a quick look at the new classes and made minor changes to my code, I hope it will work for you with no more changes.
Good luck
I'm sorry that I have a question to the code from Guy S.
In your code, there are two following statements in both createPeerConnectionInternal() and onDataChannel().
dataChannel.registerObserver(new DcObserver());
I think it may cause twice registrations. Is it correct??
I mean, before making a call, it created a dataChannal and registered an Observer. Then.. if there is a call comes in, the onDataChannel called, then the dataChannel point to dc and register again??
