Wsrtjtyk

I am new to creating AR app using ARCore and Sceneform for Android (Java). I am building a multiplayer app using cloud anchors where two or more people can interact on one or more asset. When the asset changes it's position, how to get the event to broadcast to other connected users?

Here's my code:

private AppAnchorState appAnchorState = AppAnchorState.NONE;



private SnackbarHelper snackbarHelper = new SnackbarHelper();



private StorageManager storageManager;



private Socket mSocket;



@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);



    /******************* Here **************************/

    // connect to socket



    mSocket = new ArSync().onCreate();

    mSocket.connect();

    // listen for change event



    mSocket.on("modelChanged", new Emitter.Listener() {

        @Override

        public void call(final Object... args) {

            MainActivity.this.runOnUiThread(new Runnable() {

                @Override

                public void run() {

                    //TODO: call the application to load reslove by number

                    //textView.setText("Current ID is :" + 

                      args[0].toString());

                    Log.d("Triggered", args[0].toString());

                    onResolveOkPressed(args[0].toString());



                }

                        });

    }

});



fragment = (CustomArFragment) getSupportFragmentManager().findFragmentById(R.id.sceneform_fragment);

//To add

fragment.getPlaneDiscoveryController().hide();

fragment.getArSceneView().getScene().setOnUpdateListener(this::onUpdateFrame);



Button clearButton = findViewById(R.id.clear_button);

clearButton.setOnClickListener(new View.OnClickListener() {

    @Override

    public void onClick(View view) {

        setCloudAnchor(null);

    }

});





Button resolveButton = findViewById(R.id.resolve_button);

resolveButton.setOnClickListener(new View.OnClickListener() {

    @Override

    public void onClick(View view) {

        if (cloudAnchor != null){

            snackbarHelper.showMessageWithDismiss(getParent(), "Please clear Anchor");

            return;

        }

        ResolveDialogFragment dialog = new ResolveDialogFragment();

        dialog.setOkListener(MainActivity.this::onResolveOkPressed);

        dialog.show(getSupportFragmentManager(), "Resolve");



    }

});





fragment.setOnTapArPlaneListener(

        (HitResult hitResult, Plane plane, MotionEvent motionEvent) -> {



            if (plane.getType() != Plane.Type.HORIZONTAL_UPWARD_FACING ||

                    appAnchorState != AppAnchorState.NONE){

                return;

            }



            Anchor newAnchor = fragment.getArSceneView().getSession().hostCloudAnchor(hitResult.createAnchor());



            setCloudAnchor(newAnchor);



            appAnchorState = AppAnchorState.HOSTING;

            snackbarHelper.showMessage(this, "Now hosting anchor...");





            placeObject(fragment, cloudAnchor, Uri.parse("Fox.sfb"));



        }

);



storageManager = new StorageManager(this);

}



/*.....

.......

....... 

*/

I have written a separate Socket.io server in NodeJS to broadcast the Short hand GUID to other connected nodes to download and resolve the asset at launch of the app. It works fine when I am rendering the asset for the first time. But I am not sure how to handle when one person moves that asset. I want it to render it other connected devices. I could not find any event to asset changed so that I could attach my code to it.