Change at runtime the background of a table added to a stage in the constructor - libgdx

Question

I need at runtime to reload a background of a table added to a stage (the user can change it at runtime).
I'm doing this but the background will change only when I switch back from another Screen or reopen my game.
MyGame.java:
String backgroundFileName = "background1.jpg";
public class MyGame extends Game {
public void create() {
...
this.setScreen(new MainMenuScreen(this));
}
public void handleChoosenBackground(String _backgroundFileName) {
backgroundFileName = _backgroundFileName;
if(getScreen() instanceof MainMenuScreen) {
((MainMenuScreen)getScreen()).reloadBackground();
}
}
}
MainMenuScreen.java:
public class MainMenuScreen implements Screen, InputProcessor {
Stage stage;
Table table;
TextureRegionDrawable textureRegionDrawableBackground;
public MainMenuScreen(final MyGame game) {
...
stage = new Stage(new FillViewport(Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight())));
textureRegionDrawableBackground = new TextureRegionDrawable(new TextureRegion(new Texture(game.backgroundFileName)));
table = new Table();
table.setFillParent(true);
table.setBackground(textureRegionDrawableBackground);
stage.addActor(table);
}
public void reloadBackground() {
textureRegionDrawableBackground = new TextureRegionDrawable(new TextureRegion(new Texture(game.backgroundFileName)));
table.setBackground(textureRegionDrawableBackground);
// log prints here, so this method is reached, with the correct new backgroundFileName
}
}
I also tried this on MyGame class but it seems that does nothing because MainMenuScreen is already the active screen:
setScreen(new MainMenuScreen(this));
If, instead, I set textureRegionDrawableBackground to null, it works showing a white background:
public void reloadBackground() {
textureRegionDrawableBackground = null; // <<<<<
table.setBackground(textureRegionDrawableBackground);
}
Thanks!

Answer 1

I had a similar problem when I didn't run table.pack() once I finished putting all the things into the table - apparently the background size doesn't automatically resize to the table size, and you need to tell it to do so.
Hope that solves your problem :)