错误

AL lib: (EE) alc_cleanup: 1 device not closed
Assertion failed!

Program: C:\Program Files\Java\jre1.8.0_25\bin\javaw.exe
File: /var/lib/jenkins/workspace/libgdx/extensions/gdx-box2d/gdx-box2d/jni/Box2D/Dynamics/b2World.cpp, Line 109

Expression: IsLocked() == false

下一行是错误发生之前的最后一行:
Body body = world.createBody(bodyDef);

我不明白这是怎么引起问题的。 worldbodyDef不是null

程序的结构是,我有一个GameStateRegular类,该类在其init方法中添加了两个新的VirusEntity对象,如下所示:
VirusEntity virus0 = new VirusEntity(world, mother, new Vector2(0, 0));
VirusEntity virus1 = new VirusEntity(world, mother, new Vector2(100, 100));
viruses.add(virus0);
viruses.add(virus1);

这很好。我设置了一个VirusEntity,以使其以Contact开头MotherCellEntity时执行以下代码:
private void setContactListener() {
    world.setContactListener(new ContactAdapter() {
        @Override
        public void beginContact(Contact contact) {
            Body bodyA = contact.getFixtureA().getBody();
            Body bodyB = contact.getFixtureB().getBody();

            if (bodyA == mother.getBody()) work(bodyA, bodyB);
            else if (bodyB == mother.getBody()) work(bodyB, bodyA);
        }

        private void work(Body motherCellBody, Body virusBody) {
            VirusEntity virus = null;
            for (VirusEntity v : viruses) {
                if (v.getBody() == virusBody) virus = v;
            }
            virus.remove();
            VirusEntity newVirus = new VirusEntity(world, mother, virus.getSpawnPosition());
            viruses.add(newVirus);
        }
    });
}

我将相同的World对象和相同的MotherCellEntity对象引用到正在创建的新VirusEntity中,但是我仍然无法确定发生了什么。

完整的GameStateRegular类:http://pastebin.com/mFpmp28T
完整的VirusEntity类:http://pastebin.com/HjSGS4ER

谢谢大家的帮助。我在这个主题上非常模糊,因为我真的不了解发生了什么。我试图对此做一些背景研究,但没有成功。

最佳答案

我如何成功

我所做的是在update类的GameStateRegular方法内部:

@Override
public void update() {
    world.step(1, 1, 1);
    mother.update();
    for (int i = 0; i < viruses.size(); i++) {
        VirusEntity e = viruses.get(i);
        if (e.isRemoved()) {
            viruses.remove(e);
            e.dispose();
            // --v--
            VirusEntity newVirus = new VirusEntity(world, mother, e.getSpawnPosition());
            viruses.add(newVirus);
            // --^--
        } else e.update();
    }
}

另外,对于我的ContactAdapter:
private void setContactListener() {
    world.setContactListener(new ContactAdapter() {

        @Override
        public void preSolve(Contact contact, Manifold manifold) {
            Body bodyA = contact.getFixtureA().getBody();
            Body bodyB = contact.getFixtureB().getBody();

            if (bodyA == mother.getBody()) virusInvolved(bodyA, bodyB);
            else if (bodyB == mother.getBody()) virusInvolved(bodyB, bodyA);
        }

        private void virusInvolved(Body motherCellBody, Body virusBody) {
            VirusEntity virus = null;
            for (VirusEntity v : viruses) {
                if (v.getBody() == virusBody) virus = v;
            }
            if (virus != null) {
                virus.setMovementAllowed(false);
                virus.remove();
            }
        }
    });
}

10-06 11:26