当上课时,我不会画出我的新舞台

时间:2015-04-18 20:57:55

标签: java android libgdx

我一直无法在游戏中添加自己的自定义字体,并且想知道为什么libgdx不喜欢在我的课程被调用后设置我的新阶段?

只要项与另一项相交,就会调用该类,而主类调用此类的.render()方法。我想让它画出#34;游戏结束"到屏幕,但我在stage.act(delta)收到错误:

Exception in thread "LWJGL Application" java.lang.NullPointerException
    at com.mygdx.game.GameOverScreen.render(GameOverScreen.java:70)
    at com.mygdx.game.MyGdxGame.render(MyGdxGame.java:191)
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:214)
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:120)

这是我的代码:

class GameOverScreen implements Screen {
    Label gameoverstring;

    private Stage stage;
    SpriteBatch spritebatch;

    BitmapFont white;
    LabelStyle headingStyle;

    @Override
    public void show() {
        stage = new Stage();
        white = new BitmapFont(Gdx.files.internal("new.fnt"), false);
        headingStyle = new LabelStyle(white, Color.WHITE);

        gameoverstring = new Label("game ovaaaa!", headingStyle);
        gameoverstring.setFontScale(3);
        stage.addActor(gameoverstring);
    }

    @Override
    public void render(float delta) {
        //gameoverstring.setPosition(0, 0);
        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        stage.act(delta);
        stage.draw();
    }

    @Override
    public void resize(int width, int height) {
    }

    @Override
    public void pause() {
    }

    @Override
    public void resume() {
    }

    @Override
    public void hide() {
    }

    @Override
    public void dispose() {
    }
}

1 个答案:

答案 0 :(得分:0)

第70行(在render方法中)的某些内容为空。有关背景信息,请参阅What is a NullPointerException, and how do I fix it?

我怀疑您的问题是stage中的render为空。可能是因为尚未调用show方法。