libGDX 1.4.1 button listener on a secondary screen - libgdx

Question

I have two screens, a MainActivity in my core folder, that has the render() method split into a few switch cases. On game-over, this part of the switch case gets triggered, which calls the render part of my game-over class:
case STOPPED:
// Exit and clean the game
gameOverScreen.render(Gdx.graphics.getDeltaTime());
break;
...
This is my GameOverScreen class:
public class GameOverScreen implements Screen {
private SpriteBatch gameOverBatch;
private FreeTypeFontGenerator gameOverFontGen;
private FreeTypeFontGenerator.FreeTypeFontParameter gameOverLogoParam;
private FreeTypeFontGenerator.FreeTypeFontParameter gameOverButtonParam;
private final MainActivity mainActivity;
private OrthographicCamera camera;
private BitmapFont bitmapLogoFont;
private BitmapFont bitmapButtonFont;
private Button exitGameButton;
private Button gameRestartButton;
private Sound buttonSound;
private Stage stage;
private float w;
private float h;
// Constructor
public GameOverScreen(MainActivity mainActivity) {
w = Gdx.graphics.getWidth();
h = Gdx.graphics.getHeight();
gameOverBatch = new SpriteBatch();
this.mainActivity = mainActivity;
camera = new OrthographicCamera();
camera.setToOrtho(false, 300, 300);
// Instantiate the font for this screen from file
gameOverFontGen = new FreeTypeFontGenerator(Gdx.files.internal("fonts/SF_Wonder_Comic.ttf"));
gameOverLogoParam = new FreeTypeFontGenerator.FreeTypeFontParameter();
gameOverLogoParam.size = 110;
gameOverButtonParam = new FreeTypeFontGenerator.FreeTypeFontParameter();
gameOverButtonParam.size = 40;
// Font for the logo
bitmapLogoFont = new BitmapFont();
bitmapLogoFont = gameOverFontGen.generateFont(gameOverLogoParam);
// Font for the buttons
bitmapButtonFont = new BitmapFont();
bitmapButtonFont = gameOverFontGen.generateFont(gameOverButtonParam);
// Instantiate the buttonSound
buttonSound = Gdx.audio.newSound(Gdx.files.internal("sounds/pauseBtn_sound.ogg"));
/*************************************** Create a Stage *******************************************/
stage = new Stage();
// Add some actors as the buttons
exitGameButton = new Button(new TextureRegionDrawable(
new TextureRegion(new Texture(Gdx.files.internal("images/off_red.png")))),
new TextureRegionDrawable(new TextureRegion(new Texture(Gdx.files.internal("images/off_white.png")))));
//exitGameButton.setX((w, 150));
//pauseButton.setY(flipCoordinates(h, 150));
exitGameButton.setOrigin(exitGameButton.getWidth() / 2, exitGameButton.getHeight() / 2);
exitGameButton.setBounds(w / 2 + 100, h / 2 - 60, exitGameButton.getWidth(), exitGameButton.getHeight());
exitGameButton.act(Gdx.graphics.getDeltaTime());
stage.addActor(exitGameButton);
exitGameButton.addListener(new ChangeListener() {
#Override
public void changed (ChangeEvent event, Actor actor) {
buttonSound.play();
}
});
// Add some actors as the buttons
TextButton.TextButtonStyle restartStyle = new TextButton.TextButtonStyle();
restartStyle.font = bitmapButtonFont;
restartStyle.up = new TextureRegionDrawable(new TextureRegion(new Texture(Gdx.files.internal("images/back_red.png"))));
restartStyle.down = new TextureRegionDrawable(new TextureRegion(new Texture(Gdx.files.internal("images/back_white.png"))));
gameRestartButton = new Button(new TextButton.TextButtonStyle(restartStyle));
gameRestartButton.setOrigin(gameRestartButton.getWidth() / 2, gameRestartButton.getHeight() / 2);
gameRestartButton.setBounds(w / 2 - 100, h / 2 - 60, gameRestartButton.getWidth(), gameRestartButton.getHeight());
gameRestartButton.act(Gdx.graphics.getDeltaTime());
stage.addActor(gameRestartButton);
// Capture the event listener for the return button
gameRestartButton.addListener(new ChangeListener() {
#Override
public void changed(ChangeEvent event, Actor actor) {
// Do something on restart
//MainActivity.state = MainActivity.State.RUN;
Gdx.app.log("GameRestartButton", " has been pressed");
}
});
gameRestartButton.act(Gdx.graphics.getDeltaTime());
//stage.addActor(exitGameButton);
//stage.addActor(gameRestartButton);
}
#Override
public void render(float delta) {
Gdx.gl.glClearColor(0, 0, 0, 0);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
gameOverBatch.begin();
bitmapLogoFont.setColor(Color.RED);
bitmapLogoFont.draw(gameOverBatch, "Game Over", w / 2 - 210, h / 2 + 150f);
gameOverBatch.end();
exitGameButton.act(Gdx.graphics.getDeltaTime());
stage.act(Gdx.graphics.getDeltaTime());
stage.draw();
}
#Override
public void resize(int width, int height) {
}
#Override
public void show() {
}
#Override
public void hide() {
}
#Override
public void pause() {
}
#Override
public void resume() {
}
#Override
public void dispose() {
gameOverFontGen.dispose();
}
}
In GameOverScreen constructor I have two buttons (exitGameButton and gameReturnButton) I'd like to be able to trigger their event-listeners, but I can't seem to be able to do it. Neither of my buttons responds to the event listener. What am I doing wrong? Do I need to add something else on to my MainActivity class for these buttons to work ? Thanks much.

Answer 1

I figured it out, on the second screen I was missing from the constructor this: Gdx.input.setInputProcessor(stage); , of course, that only works if a stage has been previously created.

Answer 2

try this in your class GameOverScreen
.//
public Stage getStageGameOverScreen(){
return this.stage;
}
your Case:
case STOPPED:
// Exit and clean the game
Gdx.input.setInputProcessor(gameOverScreen.getStageGameOverScreen());
gameOverScreen.render(Gdx.graphics.getDeltaTime());
break;
...