AndEngine Sprite/Box2D 主体移除会移除特定的主体（理应如此），但会移除该精灵的所有实例？
我正在使用 Andengine/Box2D 物理插件制作游戏。由于在世界步骤计算期间添加/移动/删除 box2d 主体，我经历了随机崩溃，因此我实现了代码来使用 setUserData 方法标记要删除的精灵/主体 - 我将一个 JSON 对象附加到每个主体和精灵包含精灵的类型、主体、精灵本身及其删除状态：
private JSONObject makeUserData(int type, Body body, Object sprite)
{
JSONObject myObject = new JSONObject();
try {
myObject.put("type", type);
myObject.put("sprite", sprite);
myObject.put("body", body);
myObject.put("deleteStatus", false);
} catch (JSONException e) {
Log.d(TAG,"Exception creating user data:"+e);
}
return myObject;
}
然后在更新线程中迭代我的世界中的所有主体，查找这些标志并删除带有该标志的精灵/主体。主体正确删除，但是精灵删除似乎删除了该特定精灵的每个实例，而不是仅删除我标记要删除的特定精灵！当我的玩家与不可见的物体碰撞时，我可以看出没有精灵的尸体仍然存在！这是删除的代码：
private void removeObjectsSetForDestruction()
{
if(this.mPhysicsWorld!=null)
{
Iterator<Body> allMyBodies = this.mPhysicsWorld.getBodies();
boolean isDelete = false;
JSONObject currentBodyData;
while(allMyBodies.hasNext())
{
try {
currentBodyData = (JSONObject)allMyBodies.next().getUserData();
if(currentBodyData!=null)
{
isDelete = (Boolean) currentBodyData.get("deleteStatus");
if(isDelete)
{
destroyObstruction((Body) currentBodyData.get("body"));
}
}
} catch (JSONException e) {
Log.d(TAG,"Error getting world bodies data:"+e);
}
}
}
}
private void destroyObstruction(Body obstructionBody) throws JSONException
{
obstructionBody.setActive(false);
JSONObject secondBodyData = null;
if(obstructionBody.getUserData()!=null)
{
secondBodyData=(JSONObject) obstructionBody.getUserData();
//explodeObstruction(((IEntity) secondBodyData.get("sprite")).getX(),((IEntity) secondBodyData.get("sprite")).getY());
if(secondBodyData.get("sprite") instanceof AnimatedSprite)
{
removeObject((AnimatedSprite) secondBodyData.get("sprite"));
}
else
{
removeObject((Sprite) secondBodyData.get("sprite"));
}
}
}
private void removeObject(final AnimatedSprite myAnimSprite)
{
final PhysicsConnector myPhysicsConnector = this.mPhysicsWorld.getPhysicsConnectorManager().findPhysicsConnectorByShape(myAnimSprite);
this.mPhysicsWorld.unregisterPhysicsConnector(myPhysicsConnector);
this.mPhysicsWorld.destroyBody(myPhysicsConnector.getBody());
this.mScene.unregisterTouchArea(myAnimSprite);
this.mScene.detachChild(myAnimSprite);
System.gc();
}
private void removeObject(final Sprite mySprite)
{
final PhysicsConnector myPhysicsConnector = this.mPhysicsWorld.getPhysicsConnectorManager().findPhysicsConnectorByShape(mySprite);
this.mPhysicsWorld.unregisterPhysicsConnector(myPhysicsConnector);
this.mPhysicsWorld.destroyBody(myPhysicsConnector.getBody());
this.mScene.unregisterTouchArea(mySprite);
this.mScene.detachChild(mySprite);
System.gc();
}
I am making a game using Andengine/Box2D physics addon. I experienced the random crashes due to the addition/movement/deletion of box2d bodies during the world step calculation, so I have implemented code to flag sprites/bodies for removal using the setUserData method - I attach a JSON object to each body and sprite that contains the type of sprite, the body, and the sprite itself and its delete status:
private JSONObject makeUserData(int type, Body body, Object sprite)
{
JSONObject myObject = new JSONObject();
try {
myObject.put("type", type);
myObject.put("sprite", sprite);
myObject.put("body", body);
myObject.put("deleteStatus", false);
} catch (JSONException e) {
Log.d(TAG,"Exception creating user data:"+e);
}
return myObject;
}
then in an update thread iterate through all the bodies in my world looking for these flags and delete the sprites/bodies with the flag. The bodies remove correctly, however the sprite removal seems to delete every instance of that particluar sprite rather than just removing the particular one i flagged to remove! I can tell the bodies are still present without the sprite as my player collides with invisible objects! Here is the code for removal:
private void removeObjectsSetForDestruction()
{
if(this.mPhysicsWorld!=null)
{
Iterator<Body> allMyBodies = this.mPhysicsWorld.getBodies();
boolean isDelete = false;
JSONObject currentBodyData;
while(allMyBodies.hasNext())
{
try {
currentBodyData = (JSONObject)allMyBodies.next().getUserData();
if(currentBodyData!=null)
{
isDelete = (Boolean) currentBodyData.get("deleteStatus");
if(isDelete)
{
destroyObstruction((Body) currentBodyData.get("body"));
}
}
} catch (JSONException e) {
Log.d(TAG,"Error getting world bodies data:"+e);
}
}
}
}
private void destroyObstruction(Body obstructionBody) throws JSONException
{
obstructionBody.setActive(false);
JSONObject secondBodyData = null;
if(obstructionBody.getUserData()!=null)
{
secondBodyData=(JSONObject) obstructionBody.getUserData();
//explodeObstruction(((IEntity) secondBodyData.get("sprite")).getX(),((IEntity) secondBodyData.get("sprite")).getY());
if(secondBodyData.get("sprite") instanceof AnimatedSprite)
{
removeObject((AnimatedSprite) secondBodyData.get("sprite"));
}
else
{
removeObject((Sprite) secondBodyData.get("sprite"));
}
}
}
private void removeObject(final AnimatedSprite myAnimSprite)
{
final PhysicsConnector myPhysicsConnector = this.mPhysicsWorld.getPhysicsConnectorManager().findPhysicsConnectorByShape(myAnimSprite);
this.mPhysicsWorld.unregisterPhysicsConnector(myPhysicsConnector);
this.mPhysicsWorld.destroyBody(myPhysicsConnector.getBody());
this.mScene.unregisterTouchArea(myAnimSprite);
this.mScene.detachChild(myAnimSprite);
System.gc();
}
private void removeObject(final Sprite mySprite)
{
final PhysicsConnector myPhysicsConnector = this.mPhysicsWorld.getPhysicsConnectorManager().findPhysicsConnectorByShape(mySprite);
this.mPhysicsWorld.unregisterPhysicsConnector(myPhysicsConnector);
this.mPhysicsWorld.destroyBody(myPhysicsConnector.getBody());
this.mScene.unregisterTouchArea(mySprite);
this.mScene.detachChild(mySprite);
System.gc();
}
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我想看看您的对象创建代码。我假设每个 sprite 都使用相同的
TextureRegion，因此当一个 sprite 的区域发生更改时，由于 Android 架构的具体情况，其他 sprite 上的相同区域也会发生更改。对于具有相同TextureRegion的每个精灵，您应该使用textureRegion.clone()作为构造函数的最后一个参数。希望这有帮助。I would like to take a look at your objects creating code. I assume every sprite has the same
TextureRegionused, so when the region of one sprite is being changed - same regions on other sprites are being changed too due to Android architecture specifics. For every sprite with sameTextureRegionyou should usetextureRegion.clone()as the last parameter of the constructor. Hope this helps.