AndEngine如果跳轉方法被調用，如何使sprite不跳轉

Question

所以我有這種方法，當我觸摸屏幕時，我的精靈將跳轉。現在的問題是，當我連續觸摸屏幕時，精靈會一次又一次地跳躍。我想要做的是，如果跳躍，跳躍方法不能被調用，除非我的精靈擊中地面。

這是代碼。

 
public class PhyiscsActivity extends BaseGameActivity implements IAccelerometerListener, IOnSceneTouchListener{
 

private static final int CAMERA_WIDTH = 720; 
private static final int CAMERA_HEIGHT = 480; 
private Camera mCamera; 
private BitmapTextureAtlas mBitmapTextureAtlas; 
private TiledTextureRegion mTextureRegion; 
private Scene mScene; 
private FixtureDef mFixtureDef = PhysicsFactory.createFixtureDef(1,-10f, 0.5f); 
private PhysicsWorld mPhysicsWorld; 
private Body body; 
private AnimatedSprite facebox; 
private FixtureDef wallfixture = PhysicsFactory.createFixtureDef(-1,0.5f, 0.5f); 
@Override 
public Engine onLoadEngine() { 
    // TODO Auto-generated method stub 
    this.mCamera = new Camera(0,0,CAMERA_WIDTH, CAMERA_HEIGHT); 
    final EngineOptions mEngineOptions = new EngineOptions(true, ScreenOrientation.LANDSCAPE, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT),this.mCamera); 
    mEngineOptions.getTouchOptions().setRunOnUpdateThread(true); 
    return new Engine(mEngineOptions); 
} 

@Override 
public void onLoadResources() { 
    // TODO Auto-generated method stub 
    this.mBitmapTextureAtlas = new BitmapTextureAtlas(128,128, TextureOptions.BILINEAR_PREMULTIPLYALPHA); 
    this.mTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mBitmapTextureAtlas, this, "gfx/face_box_tiled.png", 0, 0, 2, 1); 
    this.mEngine.getTextureManager().loadTexture(this.mBitmapTextureAtlas); 
} 

@Override 
public Scene onLoadScene() { 
    // TODO Auto-generated method stub 
    this.mEngine.registerUpdateHandler(new FPSLogger()); 
    this.mScene = new Scene(); 
    this.mScene.setBackground(new ColorBackground(1,1,1)); 
    this.mPhysicsWorld = new PhysicsWorld(new Vector2(0,SensorManager.GRAVITY_EARTH),false); 

    // This is the walls 
    final Shape roof = new Rectangle(0, 0, CAMERA_WIDTH, 2); 
    final Shape ground = new Rectangle(0,CAMERA_HEIGHT - 2,CAMERA_WIDTH,2); 
    final Shape left = new Rectangle(0,0,2,CAMERA_HEIGHT); 
    final Shape right = new Rectangle(CAMERA_WIDTH -2, 0,2,CAMERA_HEIGHT); 
    PhysicsFactory.createBoxBody(this.mPhysicsWorld, ground, BodyType.StaticBody, wallfixture); 
    PhysicsFactory.createBoxBody(this.mPhysicsWorld, roof, BodyType.StaticBody, wallfixture); 
    PhysicsFactory.createBoxBody(this.mPhysicsWorld, left, BodyType.StaticBody, wallfixture); 
    PhysicsFactory.createBoxBody(this.mPhysicsWorld, right, BodyType.StaticBody, wallfixture); 

    // This is the Sprite 
    facebox = new AnimatedSprite(30,(CAMERA_HEIGHT - 2) - this.mTextureRegion.getHeight() ,this.mTextureRegion); 
    body = PhysicsFactory.createBoxBody(this.mPhysicsWorld, facebox, BodyType.DynamicBody, mFixtureDef); 
    this.mScene.attachChild(facebox); 

    this.mScene.registerUpdateHandler(this.mPhysicsWorld); 
    this.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(facebox,body,true,true)); 
    this.mScene.setOnSceneTouchListener(this); 
    return this.mScene; 

} 

@Override 
public void onLoadComplete() { 
    // TODO Auto-generated method stub 

} 


//Accelerometer 
@Override 
public void onAccelerometerChanged(AccelerometerData pAccelerometerData) { 
    // TODO Auto-generated method stub 
    final Vector2 gravity = Vector2Pool.obtain(pAccelerometerData.getX()* 3, 10); 
    this.mPhysicsWorld.setGravity(gravity); 
    Vector2Pool.recycle(gravity); 
} 

@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 
    this.enableAccelerometerSensor(this); 
} 

@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    super.onPause(); 
    this.disableAccelerometerSensor(); 
} 

//This is where i make the sprite jump 
@Override 
public boolean onSceneTouchEvent(Scene pScene, TouchEvent pSceneTouchEvent) { 
    pSceneTouchEvent.isActionDown();{ 
     this.jump(facebox); 
    } 
    return false; 


} 
public void jump(AnimatedSprite sprite){ 
    boolean jumping = false; 
    if(!jumping){ 
     body.setLinearVelocity(new Vector2(body.getLinearVelocity().x,-8f));   
     } 
    } 

public void jump(AnimatedSprite sprite){ 
    if(!jumping){ 
     body.setLinearVelocity(new Vector2(body.getLinearVelocity().x,-10));  
     jumping = true; 
    } 

    } 

@Override 
public void beginContact(Contact contact) { 
    // TODO Auto-generated method stub 
    jumping = true; 
} 

@Override 
public void endContact(Contact contact) { 
    // TODO Auto-generated method stub 
jumping = false; 
} 

我不知道爲什麼beginContact和endContact不initialzing。有什麼我應該做的初始化這個？例如更新處理程序？ contactlistener？

Answer 1

你需要有一個方法告訴你，如果你的球員跳或不。

public void jump(AnimatedSprite sprite){ 

    if(isJumping(sprite)){ 
     body.setLinearVelocity(new Vector2(body.getLinearVelocity().x,-8f));   
     } 

在這種方法中，您應該設法計算玩家是否跳躍。就像如果他碰着牆（如果玩家的身體（X，Y）是牆面（矩形））

確定你使用的Box2D做物理=）

你必須創建一個ContactListener，你必須實現這個類和你想添加的功能。 http://code.google.com/p/andenginephysicsbox2dextension/source/browse/src/com/badlogic/gdx/physics/box2d/ContactListener.java?r=1605f6e82f710ef9ebbe07632d6b055239d3b520

public void beginContact (Contact contact); 
public void endContact (Contact contact); 

接觸對象將countain你的對象（夾具）是感人。你只需在身體觸摸時檢查並設置跳轉爲假，當你打電話跳轉時設置爲真，並且你可以跳轉，設置跳轉爲真;

好嗎？

@Override 
public void beginContact(Contact contact) { 
    // TODO Auto-generated method stub 
    jumping = true; 
} 

@Override 
public void endContact(Contact contact) { 
    // TODO Auto-generated method stub 
jumping = false; 
} 

這是假的。我倒覺得它像只：

@Override 
public void beginContact(Contact contact) { 
    jumping = false; //you touched ground so you aren't jumping anymore 
} 

@Override 
public void endContact(Contact contact) { 
jumping = true; //you leave ground so you're jumping 
} 

和一個跳轉方法（而不是兩個）：

public void jump(AnimatedSprite sprite){ 
     if(!jumping){ 
      jumping = true; 
      body.setLinearVelocity(new Vector2(body.getLinearVelocity().x,-8f));   
      } 
     } 

你看?;