Java 尝试更改我的参与者在渲染中的位置时，libGDX中出现空指针异常

当我试图运行这段代码时，它只在我调用actor的方法“isPulsado”或“setPosition”时，才会给我的应用程序一个Null指针异常

渲染方法：

public void render() {
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        lienzo.setProjectionMatrix(cam.combined);
        shaper1.setProjectionMatrix(cam.combined);
        shaper2.setProjectionMatrix(cam.combined);

        lienzo.begin();
        shaper1.begin(ShapeRenderer.ShapeType.Filled);
        shaper1.setColor(1, 1, 1, 1);
        shaper2.begin(ShapeRenderer.ShapeType.Filled);
        shaper2.setColor(0.545f, 0.271f, 0.075f, 1f);
        for (int i = 0; i <= 300; i += 100) {
            for (float j = 0; j <= 300; j += 100) {
                shaper1.box(i, j, 10, 50, 50, 10);
                shaper1.box(i + 50, j + 50, 10, 50, 50, 10);

            }
            for (int j = 0; j <= 300; j += 100) {
                shaper2.box(i, j + 50, 10, 50, 50, 10);
                shaper2.box(i + 50, j, 10, 50, 50, 10);
            }
        }
        shaper1.end();
        shaper2.end();
        lienzo.end();
        stage.act(Gdx.graphics.getDeltaTime());
        if(reyBlanco.isPulsado())reyBlanco.setPosition(Gdx.input.getX() - 20, -Gdx.input.getY() + 375);
        stage.draw();

    }

我在create方法中初始化了actor，并将其放置在表中

public void create() {

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

        Rey reyBlanco = new Rey(150, 0);
        Reina reinaBlanco = new Reina(200, 0);

        stage.addActor(reyBlanco);
        stage.addActor(reinaBlanco);

        cam = new OrthographicCamera(ancho, alto);

        lienzo = new SpriteBatch();
        shaper1 = new ShapeRenderer();
        shaper2 = new ShapeRenderer();

    }

---

NPE-因为您甚至没有初始化全局变量

reyBlanco

应该是

reyBlanco = new Rey(150, 0); 

而不是

Rey reyBlanco = new Rey(150, 0);   // This is local initialization in your code.

---

上行将在当前范围内创建一个名为

reyBlanco

的新变量，并覆盖全局变量。全局设置仍然是

null

您是否初始化了

reyBlanco

？是的，我更新了问题

Rey reyBlanco = new Rey(150, 0);   // This is local initialization in your code.