Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                Gdx.app.postRunnable(new Runnable() {
                    @Override
                    public void run() {
                        Assets.loadGameAssets();
                        Assets.manager.finishLoading();
                        loadingFinish = true;
                    }
                });
            }
        });

        thread.start();