1

我有一个启动类，它应该只显示启动图像，但它会导致空指针异常。当我在其他 Java 应用程序中使用这种方法时，它很激动。我已经阅读了大量文档以了解我哪里出错了，但我似乎找不到它。

Splash.java class
package com.me.fypapplication;

import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class Splash implements Screen{

private SpriteBatch spriteBatch;
private Texture splashTexture;
private Sprite sprite;

private Game myGame;

private OrthographicCamera camera;

public Splash (Game g)
{
    myGame = g;
}

public void create() {

    camera = new OrthographicCamera(800,400);

    splashTexture = new Texture(Gdx.files.internal("data/splashtest.gif"));

    sprite = new Sprite(splashTexture);
    sprite.setSize(512, 512);
    sprite.setPosition(256, 256);

    spriteBatch = new SpriteBatch();

    splashTexture.setFilter(TextureFilter.Linear, TextureFilter.Linear);


}

@Override
public void render(float delta) {

    Gdx.gl.glClearColor(0.1f, 0.1f, 0.1f, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

    camera.update();

    spriteBatch.begin();
    sprite.draw(spriteBatch);
    spriteBatch.end();

}

如果有人可以提供帮助将不胜感激！

编辑！忘记了错误

Exception in thread "LWJGL Application" java.lang.NullPointerException
at com.me.fypapplication.Splash.render(Splash.java:51)
at com.badlogic.gdx.Game.render(Game.java:46)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:190)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:110)
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1 回答 1

3

Your camera is null because nothing is calling create(). If you're implementing a libgdx Screen and need to initialise things then you should override the show() method before render() is called.

于 2013-03-06T13:38:21.193 回答