private String streamUrl;

@Override
    protected void onResume() {

        super.onResume();

        if (playerView == null) {

            progressBar = (ProgressBar) findViewById(R.id.loadings_bar);
            playerView = (SimpleExoPlayerView) findViewById(R.id.exo_player);

            String userAgent = Util.getUserAgent(this, getApplicationContext().getApplicationInfo().packageName);
            DefaultHttpDataSourceFactory httpDataSourceFactory = new DefaultHttpDataSourceFactory(userAgent, null, DefaultHttpDataSource.DEFAULT_CONNECT_TIMEOUT_MILLIS, DefaultHttpDataSource.DEFAULT_READ_TIMEOUT_MILLIS, true);
            DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(this, null, httpDataSourceFactory);
            Uri daUri = Uri.parse(streamUrl);

            mVideoSource = new HlsMediaSource(daUri, dataSourceFactory, 1, null, null);
        }
        initializeExoPlayer();
    }

public void setWebmData(WebmQuery.Data data) {

        final WebmQuery.GetWebm getWebm = data.getWebm();

        if (getWebm != null) {
            streamUrl = getWebm.url();
        }
    }

    private void fetchWebmDetails() {

        ApolloCall<WebmQuery.Data> webmQuery = application.apolloClient()
                .query(new WebmQuery(getIntent().getStringExtra("id")));
        disposables.add(Rx2Apollo.from(webmQuery)
                .observeOn(AndroidSchedulers.mainThread())
                .subscribeOn(Schedulers.io())
                .subscribeWith(new DisposableObserver<Response<WebmQuery.Data>>() {
                    @Override
                    public void onNext(Response<WebmQuery.Data> dataResponse) {
                        setWebmData(dataResponse.data());
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.e(TAG, e.getMessage(), e);
                    }

                    @Override
                    public void onComplete() {

                    }
                }));
    }