Spritebatch没有绘制任何LibGDX

Question

This is one of the oddest things that has ever occured in LibGDX for me. I have used these exact specifications for all my other States in my game, but under different names and they all work fine, except for my ShopState, which won't render ANYTHING at all! Here's my code for the class:

public class ShopState extends State{
    private Texture bg;
    private Sprite shopLayout;
    private OrthographicCamera shopCam;
    Viewport viewport;

    public ShopState(GameStateManager gsm) {
        super(gsm);
        shopLayout = new Sprite(new Texture(Gdx.files.internal("shopLayout.png")));
        bg = new Texture("bg2.png");
        shopCam = new OrthographicCamera();
        viewport = new StretchViewport(720, 1280, shopCam);
        viewport.apply();
        shopCam.position.set(shopCam.viewportWidth / 2, shopCam.viewportHeight / 2, 0);
        shopLayout.setPosition(shopCam.viewportWidth / 2 - shopLayout.getWidth() / 2, shopCam.viewportHeight / 2 - shopLayout.getHeight() / 2);
        shopLayout.setSize(650, 1100);
    }

    @Override
    public void handleInput() {

    }

    @Override
    public void update(float dt) {
        handleInput();

    }
    @Override
    public void resize(int width, int height){
        viewport.update(width, height);
        shopCam.position.set(shopCam.viewportWidth / 2, shopCam.viewportHeight / 2, 0);
    }


    @Override
    public void render(SpriteBatch sb) {
        shopCam.update();
        sb.setProjectionMatrix(shopCam.combined);
        sb.begin();
        sb.draw(bg, 0 , 0, shopCam.viewportWidth, shopCam.viewportHeight);
        shopLayout.draw(sb);
        sb.end();

    }

    @Override
    public void dispose() {
        bg.dispose();
        shopLayout.getTexture().dispose();

    }
}

What am I doing wrong? Everything seems fine, but all I get when I click on the Shop button, it gives me a black screen!

Answer 1

Ok, found a solution, but I have no idea why this fixes it. All I had to do was add a stage that uses the current viewport.

stage = Stage(viewport);

And that was it! It is now working properly, for some reason...