AndroidStudio libgdx ChangeListener无法正常工作 [英] AndroidStudio libgdx ChangeListener not working

问题描述

Android Studio-libgdx制作2D游戏.我有一个Main创建MenuState，在我制作的render方法中

Android Studio-libgdx making a 2d game. I have a Main which creates the MenuState, in the render method I made this

    @Override
    public void render(float delta) {
    Gdx.gl.glClearColor(0, 0, 0.2f, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

    camera.update();
    myGame.batch.setProjectionMatrix(camera.combined);
    batch = new SpriteBatch();
    skin = new Skin(Gdx.files.internal("data/uiskin.json"));
    stage = new Stage();

    final TextButton button = new TextButton("Click me", skin, "default");

    button.setWidth(400f);
    button.setHeight(100f);
    button.setPosition(Gdx.graphics.getWidth() / 2 - 100f, Gdx.graphics.getHeight() / 2 - 10f);

    button.addListener(new ChangeListener() {
        @Override
        public void changed(ChangeEvent event, Actor actor) {
            Gdx.gl.glClearColor(1, 0, 0, 1);
            Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        }
    });
    stage.addActor(button);

    Gdx.input.setInputProcessor(stage);

    myGame.batch.begin();
    stage.draw();
    myGame.batch.end();
}

我检查了一些有关如何制作菜单的教程，这几乎就是我在这里要测试的内容.但是，当我运行该应用程序时，该按钮出现，如果单击它，则什么也没有发生.我尝试使用ClickListener进行测试，但仍然无法正常工作.有任何想法吗?还是我做错了，还是应该用另一种方法?我是libgdx的新手.提前致谢.

I checked some tutorials on how to make a menu and that's pretty much what I'm testing in here. But when I run the app the button appears and nothing happens if I click it. I've tried testing with the ClickListener but still doesn't work. Any ideas? Or am I doing it wrong or it should be in another method? I'm new with libgdx. Thanks in advance.

推荐答案

您要在render方法中创建舞台，外观和批处理的新实例吗?将它们从渲染方法中移开；)

You are creating new instances of the stage, skin and batch in render method? Move them away from your render method ;)

渲染应该看起来像这样:

Render should look more like this:

    @Override
        public void render(float delta) {
        Gdx.gl.glClearColor(0, 0, 0.2f, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        camera.update();
        myGame.batch.setProjectionMatrix(camera.combined);

        myGame.batch.begin();
        stage.draw();
        myGame.batch.end();
}

在构造函数中:

    batch = new SpriteBatch();
    skin = new Skin(Gdx.files.internal("data/uiskin.json"));
    stage = new Stage();

    final TextButton button = new TextButton("Click me", skin, "default");

    button.setWidth(400f);
    button.setHeight(100f);
    button.setPosition(Gdx.graphics.getWidth() / 2 - 100f, Gdx.graphics.getHeight() / 2 - 10f);

    button.addListener(new ChangeListener() {
        @Override
        public void changed(ChangeEvent event, Actor actor) {
            Gdx.gl.glClearColor(1, 0, 0, 1);
            Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        }
    });
    stage.addActor(button);

    Gdx.input.setInputProcessor(stage);

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