Java 如何使用LevelLoader方法'；忽略'；未定义的实体？

我正在使用一种将xml文件加载到游戏中的方法，其级别与此非常类似：

private void loadLevel(int levelID)
{
final SimpleLevelLoader levelLoader = new SimpleLevelLoader(vbom);

final FixtureDef FIXTURE_DEF = PhysicsFactory.createFixtureDef(0, 0.01f, 0.5f);

levelLoader.registerEntityLoader(new EntityLoader<SimpleLevelEntityLoaderData>(LevelConstants.TAG_LEVEL)
{
    public IEntity onLoadEntity(final String pEntityName, final IEntity pParent, final Attributes pAttributes, final SimpleLevelEntityLoaderData pSimpleLevelEntityLoaderData) throws IOException 
    {
        final int width = SAXUtils.getIntAttributeOrThrow(pAttributes, LevelConstants.TAG_LEVEL_ATTRIBUTE_WIDTH);
        final int height = SAXUtils.getIntAttributeOrThrow(pAttributes, LevelConstants.TAG_LEVEL_ATTRIBUTE_HEIGHT);

        // TODO later we will specify camera BOUNDS and create invisible walls
        // on the beginning and on the end of the level.

        return GameScene.this;
    }
});

levelLoader.registerEntityLoader(new EntityLoader<SimpleLevelEntityLoaderData>(TAG_ENTITY)
{
    public IEntity onLoadEntity(final String pEntityName, final IEntity pParent, final Attributes pAttributes, final SimpleLevelEntityLoaderData pSimpleLevelEntityLoaderData) throws IOException
    {
        final int x = SAXUtils.getIntAttributeOrThrow(pAttributes, TAG_ENTITY_ATTRIBUTE_X);
        final int y = SAXUtils.getIntAttributeOrThrow(pAttributes, TAG_ENTITY_ATTRIBUTE_Y);
        final String type = SAXUtils.getAttributeOrThrow(pAttributes, TAG_ENTITY_ATTRIBUTE_TYPE);

        final Sprite levelObject;

        if (type.equals(TAG_ENTITY_ATTRIBUTE_TYPE_VALUE_PLATFORM1))
        {
            levelObject = new Sprite(x, y, resourcesManager.platform1_region, vbom);
            PhysicsFactory.createBoxBody(physicsWorld, levelObject, BodyType.StaticBody, FIXTURE_DEF).setUserData("platform1");
        } 
        else if (type.equals(TAG_ENTITY_ATTRIBUTE_TYPE_VALUE_PLATFORM2))
        {
            levelObject = new Sprite(x, y, resourcesManager.platform2_region, vbom);
            final Body body = PhysicsFactory.createBoxBody(physicsWorld, levelObject, BodyType.StaticBody, FIXTURE_DEF);
            body.setUserData("platform2");
            physicsWorld.registerPhysicsConnector(new PhysicsConnector(levelObject, body, true, false));
        }
        else if (type.equals(TAG_ENTITY_ATTRIBUTE_TYPE_VALUE_PLATFORM3))
        {
            levelObject = new Sprite(x, y, resourcesManager.platform3_region, vbom);
            final Body body = PhysicsFactory.createBoxBody(physicsWorld, levelObject, BodyType.StaticBody, FIXTURE_DEF);
            body.setUserData("platform3");
            physicsWorld.registerPhysicsConnector(new PhysicsConnector(levelObject, body, true, false));
        }
        else if (type.equals(TAG_ENTITY_ATTRIBUTE_TYPE_VALUE_COIN))
        {
            levelObject = new Sprite(x, y, resourcesManager.coin_region, vbom)
            {
                @Override
                protected void onManagedUpdate(float pSecondsElapsed) 
                {
                    super.onManagedUpdate(pSecondsElapsed);

                    /** 
                     * TODO
                     * we will later check if player collide with this (coin)
                     * and if it does, we will increase score and hide coin
                     * it will be completed in next articles (after creating player code)
                     */
                }
            };
            levelObject.registerEntityModifier(new LoopEntityModifier(new ScaleModifier(1, 1, 1.3f)));
        }            
        else
        {
            throw new IllegalArgumentException();
        }

        levelObject.setCullingEnabled(true);

        return levelObject;
    }
});

levelLoader.loadLevelFromAsset(activity.getAssets(), "level/" + levelID + ".lvl");

---

我需要能够在不同的时间从一个级别的文件中加载不同的实体，那么我如何才能以某种方式修改此方法，使其只是“忽略”未定义的实体？

我刚刚查看了LevelParser.java方法startElement（），通过创建默认实体加载器，可以绕过在Andengine中引发IllegalArgumentException异常的位置。即

levelLoader.setDefaultEntityLoader( new IEntityLoader()
{

    @Override
    public void onLoadEntity(String pEntityName, Attributes pAttributes) {
        // TODO Auto-generated method stub
        Log.w("setDefaultEntityLoader","Unknown Entity");
    }

});

然后将调用此默认onLoadEntity（），而不是引发异常。我在GLES 1上测试了它，它工作正常

---

希望这有帮助。

捕获抛出的
IllegalArgumentException
。这是
LevelLoader.java
的第127行，在抛出异常的那一行之前，
try
捕获的一部分会去哪里。基于stacktrace，即
LevelLoader.java
的第127行，它应该放在level loader方法的何处？只要在LevelLoader.loadLevelFromAsset（）调用之前，顺序就不是关键的。为XML中的每个对应实体名称调用相关的onLoadEntity接口实例，它们在实际解析XML的方法（loadLevelFromAsset）之前注册的顺序无关紧要。在调用levelLoader.loadLevelFromAsset（）作为最后一个注册的加载程序之前，我可能会将其放在这里，这样，如果您注册了很多加载程序，我就可以在代码中更轻松地找到它。
levelLoader.setDefaultEntityLoader( new IEntityLoader()
{

    @Override
    public void onLoadEntity(String pEntityName, Attributes pAttributes) {
        // TODO Auto-generated method stub
        Log.w("setDefaultEntityLoader","Unknown Entity");
    }

});