Libgdx, actor touchlistener not working

Question

public class Main extends ApplicationAdapter {

SpriteBatch batch;

OrthographicCamera camera;

Stage stage;

Image greyback;
Image circle;

private float width;
private float height;

@Override
public void create () {

    batch = new SpriteBatch();

    camera = new OrthographicCamera();

    stage = new Stage();
    Gdx.input.setInputProcessor(stage);

    greyback = new Image(new Texture("greyback.png"));
    circle = new Image(new Texture("circle.png"));

    width = Gdx.graphics.getWidth();
    height = Gdx.graphics.getHeight();

    greyback.setWidth(width);
    greyback.setHeight(height);

    circle.setPosition(200,200);

    circle.setBounds(200, 200, circle.getWidth(), circle.getHeight());
    circle.setTouchable(Touchable.enabled);
    circle.addListener(new InputListener() {

        public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {

            System.out.println("CLICKED");

            return true;

        }

        public void touchUp(InputEvent event, float x, float y, int pointer, int button) {

            System.out.println("REMOVED");

        }

    });

    stage.addActor(greyback);
    stage.addActor(circle);

}

@Override
public void render () {

    stage.draw();

}

} But, when I click on the circle the touchlistener doesnt fire, why?

Answer 1

In your call

circle.setBounds(200, 200, circle.getWidth(), circle.getHeight());

The getWidth() and getHeight() calls are methods on Actor, not Image. You have not set the Actor's width and height, so you are setting its bounds to a rectangle with a height and width of 0... no clickable area.

Change the call to

circle.setBounds(200, 200, circle.getImageWidth(), circle.getImageHeight());

Answer 2

You need to do this :

stage.act();

This will make your Stage acting, so your Button Listener will work :)