[置顶] Cocos2d android(一个小时学会FlyppyBird开发)

首先请下载源码程序。。。。。。。

（下面内容请再熟悉Android开发以后继续观看）

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正式写代码之前，先大概介绍一下Cocos2d

Cocos2d-x 是一个支持多平台的 2D 手机游戏引擎，使用 C++ 开发，基于OpenGL ES，基于Cocos2d-iphone，支持 WOPhone, iOS 4.1, Android 2.1 及更高版本, WindowsXP & Windows7，WindowsPhone 8.

Cocos2d引擎框架如下图：

Cocos2d-x 基于Cocos2d-iphone。原则上在IOS上开发完成以后可以通过工具转换为Android版本的APK（具体如何转，在此不做介绍）。

Cocos2d基础理论：

请观看视频http://edu.51cto.com/lesson/id-13256.html

FlyppyBird游戏在此分四步：

1、添加小鸟

2、添加地板

3、改变小鸟速度

4、添加滑块并设置速度

那么接下来开始写代码：

首先搭建Android工程

这里我们仍然默认LauncherActivity为MainActivity

public class MainActivity extends Activity {static{System.loadLibrary("gdx");}CCGLSurfaceView view;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        view = new CCGLSurfaceView(this);        CCDirector director = CCDirector.sharedDirector();director.setDeviceOrientation(CCDirector.kCCDeviceOrientationPortrait);//初始化导演类        director.attachInView(view);        director.setAnimationInterval(1/30.0);        director.setDisplayFPS(true);//以上三句设置导演类的属性        setContentView(view);        CCScene scene = CCScene.node();//初始化场景类        FlyppyBirdLayer layer = new FlyppyBirdLayer(this);//布景层        scene.addChild(layer);        director.runWithScene(scene);//运行场景    }}

接下来按照上面四步开始写布景层：

1、添加小鸟

private void addBird() {bird = CCSprite.sprite("bird.png");CGSize s = bird.getContentSize();BodyDef bodyDef = new BodyDef();bodyDef.type = BodyType.DynamicBody;bodyDef.position.set(300 / PTM_RATIO, 800 / PTM_RATIO);// Define another box shape for our dynamic body.PolygonShape dynamicBox = new PolygonShape();dynamicBox.setAsBox(s.width / 2 / PTM_RATIO, s.height / 2 / PTM_RATIO);// These are mid points for our 1m box// dynamicBox.density = 1.0f;// dynamicBox.friction = 0.3f;// Define the dynamic body fixture and set mass so it's dynamic.Body body = world.createBody(bodyDef);body.setUserData(bird);FixtureDef fixtureDef = new FixtureDef();fixtureDef.shape = dynamicBox;fixtureDef.density = 1.0f;fixtureDef.friction = 0.3f;body.createFixture(fixtureDef);addChild(bird);}

2、添加地板

private void addGround() {CCSprite ground = CCSprite.sprite("ground.png");CGSize s = ground.getContentSize();BodyDef def = new BodyDef();def.type = BodyType.StaticBody;def.position.set(s.width / 2 / PTM_RATIO, s.height / 2 / PTM_RATIO);Body groundBody = world.createBody(def);FixtureDef fDef = new FixtureDef();PolygonShape pShape = new PolygonShape();pShape.setAsBox(s.width / 2 / PTM_RATIO, s.height / 2 / PTM_RATIO);fDef.shape = pShape;fDef.density = 1.0f;fDef.friction = 0.3f;groundBody.createFixture(fDef);groundBody.setUserData(ground);addChild(ground);}

3、改变小鸟速度（在这里设置当点击屏幕时小鸟向上移动）

需要首先设置当前场景的物理环境，这里我们使用Box2D

private void initWorld() {Vector2 gravity = new Vector2(0f, -9.8f);world = new World(gravity, true);world.setContinuousPhysics(true);world.setContactListener(this);}

设置屏幕接受点击事件

public FlyppyBirdLayer(Context context) {this.mContext = context;this.setIsTouchEnabled(true);this.setIsAccelerometerEnabled(true);screenSize = CCDirector.sharedDirector().winSize();}

给屏幕添加点击事件，当点击屏幕时，改变小鸟速度为向上，初始速度为10

@Overridepublic boolean ccTouchesBegan(MotionEvent event) {Iterator<Body> it = world.getBodies();while (it.hasNext()) {Body b = it.next();Object userData = b.getUserData();if (userData != null && userData instanceof CCSprite&& userData == bird) {b.setLinearVelocity(0, 10);}}return super.ccTouchesBegan(event);}

这里需要注意一点，需要每次重绘小鸟位置，否则小鸟表现为不会运动，我们调用scheduleUpdate()方法，来执行默认的update(float dt)方法（Cocos2d机制）

private void startGame() {score=0;addBird();addGround();scheduleUpdate();}

public void update(float dt) {System.out.println(world.getBodyCount());world.step(FPS, 8, 1);// Iterate over the bodies in the physics worldIterator<Body> it = world.getBodies();while (it.hasNext()) {Body b = it.next();Object userData = b.getUserData();if (userData != null && userData instanceof CCSprite) {// Synchronize the Sprites position and rotation with the// corresponding bodyfinal CCSprite sprite = (CCSprite) userData;final Vector2 pos = b.getPosition();if(pos.x<0){sprite.removeFromParentAndCleanup(true);world.destroyBody(b);score++;}else{sprite.setPosition(pos.x * PTM_RATIO, pos.y * PTM_RATIO);}}}}

4、添加滑块，并且设置速度，这里我们仍然使用schedule方法，来隔一段时间添加滑块，并且设置从右往左运动。

public void addBar(float dt) {float offset = -(new Random().nextInt(5));CCSprite downBar = CCSprite.sprite("downBar.png");CGSize downBarSize = downBar.getContentSize();BodyDef def = new BodyDef();def.type = BodyType.KinematicBody;def.position.set(screenSize.width / PTM_RATIO + 2, downBarSize.height/ PTM_RATIO + offset);def.linearVelocity.set(-5, 0);Body downBarBody = world.createBody(def);PolygonShape downPolygonShape = new PolygonShape();downPolygonShape.setAsBox(downBarSize.width / 2 / PTM_RATIO,downBarSize.height / 2 / PTM_RATIO);FixtureDef downBarFixtureDef = new FixtureDef();downBarFixtureDef.shape = downPolygonShape;downBarBody.createFixture(downBarFixtureDef);addChild(downBar);downBarBody.setUserData(downBar);CCSprite upBar = CCSprite.sprite("downBar.png");CGSize upBarSize = upBar.getContentSize();BodyDef upBardef = new BodyDef();upBardef.type = BodyType.KinematicBody;upBardef.position.set(screenSize.width / PTM_RATIO + 2,upBarSize.height / PTM_RATIO + offset + upBarSize.height * 2/ PTM_RATIO);upBardef.linearVelocity.set(-5, 0);Body upBarBody = world.createBody(upBardef);PolygonShape upPolygonShape = new PolygonShape();upPolygonShape.setAsBox(upBarSize.width / 2 / PTM_RATIO,upBarSize.height / 2 / PTM_RATIO);FixtureDef upBarFixtureDef = new FixtureDef();upBarFixtureDef.shape = upPolygonShape;upBarBody.createFixture(upBarFixtureDef);addChild(upBar);upBarBody.setUserData(upBar);}

这里添加了上下2部分滑块，中间留出空隙，让小鸟可以通过。

最后，我们需要碰撞检测

@Overridepublic void beginContact(Contact contact) {if (contact.getFixtureA().getBody().getUserData() == bird|| contact.getFixtureB().getBody().getUserData() == bird) {stopGame();handler.sendEmptyMessage(0);}}

大概简单的FlyppyBird已经完成。最后上传一下源码，供各位参考！

http://download.csdn.net/download/kay_wyong/7056443

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