为什么我得到更新线程空指针异常(Android AndEngine)？

概述我是使用AndEngine的新手,我试图让一个精灵在触摸时增加尺寸.它有点工作,但有时会突然出现这个错误.有任何想法吗？在这一点上,我只需要足够的文字,所以我会发布我的问题.如果有人需要更多信息,请告诉我,我会发布.我对创意很开放.如果您有更好的方法或查看我的代码有问题,请告诉我.在这一点上,物理世界甚至不起作用. 06-17 22:44:25.809: E/AndroidRuntime(2052 我是使用AndEngine的新手,我试图让一个精灵在触摸时增加尺寸.它有点工作,但有时会突然出现这个错误.有任何想法吗？在这一点上,我只需要足够的文字,所以我会发布我的问题.如果有人需要更多信息,请告诉我,我会发布.我对创意很开放.如果您有更好的方法或查看我的代码有问题,请告诉我.在这一点上,物理世界甚至不起作用.

06-17 22:44:25.809: E/AndroIDRuntime(20526): FATAL EXCEPTION: UpdateThread06-17 22:44:25.809: E/AndroIDRuntime(20526): java.lang.NullPointerException06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.util.modifIEr.ModifIErList.onUpdate(ModifIErList.java:66)06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.entity.Entity.onManagedUpdate(Entity.java:1392)06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.entity.Entity.onUpdate(Entity.java:1167)06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.entity.Entity.onManagedUpdate(Entity.java:1402)06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.entity.scene.Scene.onManagedUpdate(Scene.java:284)06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.entity.Entity.onUpdate(Entity.java:1167)06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.engine.Engine.onUpdateScene(Engine.java:591)06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.engine.Engine.onUpdate(Engine.java:586)06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.engine.Engine.onTickUpdate(Engine.java:548)06-17 22:44:25.809: E/AndroIDRuntime(20526):    at org.andengine.engine.Engine$UpdateThread.run(Engine.java:820)

这是我的代码：

public class TestGFX2Activity extends SimpleBaseGameActivity implements IaccelerationListener,IOnScenetouchListener {/** Called when the activity is first created. */    private static final int CAMERA_WIDTH = 720;    private static final int CAMERA_HEIGHT = 480;    private final FixtureDef FIXTURE_DEF = PhysicsFactory.createFixtureDef(1,0.5f,0.5f);    private BitmapTextureAtlas mBitmapTextureAtlas;    private TextureRegion circleTR;    private Scene scene;    boolean down=false;    float scale;    final float growRate = (float) .0001;    private PhysicsWorld mPhysicsWorld;    @OverrIDe    public EngineOptions onCreateEngineOptions() {        final Camera camera = new Camera(0,CAMERA_WIDTH,CAMERA_HEIGHT);        return new EngineOptions(true,ScreenorIEntation.LANDSCAPE_FIXED,new RatioResolutionPolicy(CAMERA_WIDTH,CAMERA_HEIGHT),camera);    }    @OverrIDe    public voID onCreateResources() {    /*line 66*/ this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(),64,128,TextureOptions.BIliNEAR); //line 66        this.circleTR = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas,this,"circle.png",0); // 64x32        this.mBitmapTextureAtlas.load();    }    @OverrIDe    public Scene onCreateScene() {        this.mEngine.registerUpdateHandler(new FPSLogger());        this.scene = new Scene();        this.scene.setBackground(new Background(0,1,0));        Log.e("Tag","Got to background");        this.scene.setonScenetouchListener(this);        this.mPhysicsWorld = new PhysicsWorld(new Vector2(0,SensorManager.GraviTY_EARTH),false);        final VertexBufferObjectManager vertexBufferObjectManager = this.getVertexBufferObjectManager();        final Rectangle ground = new Rectangle(0,CAMERA_HEIGHT - 2,2,vertexBufferObjectManager);        final Rectangle roof = new Rectangle(0,vertexBufferObjectManager);        final Rectangle left = new Rectangle(0,CAMERA_HEIGHT,vertexBufferObjectManager);        final Rectangle right = new Rectangle(CAMERA_WIDTH - 2,vertexBufferObjectManager);        final FixtureDef wallFixtureDef = PhysicsFactory.createFixtureDef(0,0.5f);        PhysicsFactory.createBoxBody(this.mPhysicsWorld,ground,BodyType.StaticBody,wallFixtureDef);        PhysicsFactory.createBoxBody(this.mPhysicsWorld,roof,left,right,wallFixtureDef);        this.scene.attachChild(ground);        this.scene.attachChild(roof);        this.scene.attachChild(left);        this.scene.attachChild(right);        this.scene.registerUpdateHandler(this.mPhysicsWorld);        return this.scene;    }    @OverrIDe    public boolean onScenetouchEvent(final Scene pScene,final touchEvent pScenetouchEvent) {        Sprite face;        Body body;        scale = 1;        if(this.mPhysicsWorld != null) {            if(pScenetouchEvent.isActionDown()) {                //this.addFace(pScenetouchEvent.getX(),pScenetouchEvent.getY());                down = true;                face = new Sprite(pScenetouchEvent.getX(),pScenetouchEvent.getY(),circleTR,this.getVertexBufferObjectManager());                body = PhysicsFactory.createBoxBody(this.mPhysicsWorld,face,BodyType.DynamicBody,FIXTURE_DEF);                new Thread(new Grow(face)).start();                return true;            } else if(pScenetouchEvent.isActionUp()){                down = false;            }        }        return false;    }    @OverrIDe    public voID onaccelerationAccuracyChanged(final accelerationData paccelerationData) {    }    @OverrIDe    public voID onaccelerationChanged(final accelerationData paccelerationData) {        final Vector2 gravity = Vector2Pool.obtain(paccelerationData.getX(),paccelerationData.getY());        this.mPhysicsWorld.setGravity(gravity);        Vector2Pool.recycle(gravity);    }    @OverrIDe    public voID onResumeGame() {        super.onResumeGame();        this.enableaccelerationSensor(this);    }    @OverrIDe    public voID onPauseGame() {        super.onPauseGame();        this.disableaccelerationSensor();    }    private class Grow implements Runnable{        Sprite s;        ScaleModifIEr mod;        public Grow(Sprite sprite){            s = sprite;            scene.attachChild(s);        }        public voID run(){            while(down){                //Log.e("Tag",float.toString(scale));                s.clearEntityModifIErs();                mod = new ScaleModifIEr((float) .1,scale,scale+growRate);                scale+=growRate;                s.registerEntityModifIEr(mod);                /*s.detachSelf();                s.setScale(scale);                scale += growRate;                try{                    Thread.sleep(100);                }catch(InterruptedException e){}                scene.attachChild(s);*/            }        }    }}

解决方法 你可能应该调用它,而不是在单独的Thread中调用它

new Grow(face)).start();

在runOnUpdate()块中,如

myActivity.runonUpdateThread(new Grow(face)));

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