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：

在Cocos2d中需要一个dao

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

@Override

public boolean ccTouchesBegan(MotionEvent event) {

Iterator

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 world

Iterator

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 body

final 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

@Override

public 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