android UI operation after receiving data from websocket server

Supposet my websocket server sends data to my android client which is defined as given below

public class ClientConnection extends AsyncTask<Void, Void, Void> {

    private void connectWebSocket() {
        URI uri;

        mWebSocketClient = new WebSocketClient(uri) {

            @Override
            public void onOpen(ServerHandshake serverHandshake) {
            }

            @Override
            public void onMessage(String s) {
                                DO_MY_UI_CHANGES(s);
            }

            @Override
            public void onClose(int i, String s, boolean b) {
                Log.d("Websocket", "Closed " + s);
            }

            @Override
            public void onError(Exception e) {
                Log.d("Websocket", "Error " + e.getMessage());
            }
        };
        mWebSocketClient.connect();
    }

Now let say I want to Update my main threads UI element after receiving data from server. As of now I know that DO_MY_UI_CHANGES(s) wont work because we are trying to modify main threads element in this thread which isnt allowed in android.

Please suggest me something so that I can make call to DO_MY_UI_CHANGES.