接着上一篇，我们完成后续的扫尾工作：游戏中个物体创建及其碰撞检测,分数保存，音效处理。

1.World类：（加入所有物体，及其碰撞检测，代码里有详细注解）

package com.zhf.mylibgdx;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import com.badlogic.gdx.math.Vector2;
/*** 统一管理世界中各个部分* @author ZHF**/
public class World {/**世界监听器接口**/public interface WorldListener {//跳跃public void jump ();//高跳public void highJump ();//碰撞public void hit ();//收集金币public void coin ();}//宽和高public static final float WORLD_WIDTH = 10;public static final float WORLD_HEIGHT = 15 * 20;//状态public static final int WORLD_STATE_RUNNING = 0;  //运行public static final int WORLD_STATE_NEXT_LEVEL = 1;  //下一关public static final int WORLD_STATE_GAME_OVER = 2;  //游戏结束//世界监听器public  WorldListener listener;//重力public static final Vector2 gravity = new Vector2(0, -12);//随机数public Random rand;public float heightSoFar; //public int score;public int state;//游戏中物体public final List<Platform> platforms;  //跳板public final Bob bob;  //主角public final List<Spring> springs;  //弹簧public final List<Squirrel> squirrels; //会飞的松鼠public final List<Coin> coins;  //金币public Castle castle;  //城堡public World(WorldListener listener) {this.listener = listener;//初始化游戏中的物体this.bob = new Bob(5, 1);this.platforms = new ArrayList<Platform>();this.springs = new ArrayList<Spring>();this.squirrels = new ArrayList<Squirrel>();this.coins = new ArrayList<Coin>();rand = new Random();generateLevel();  //生成关卡中除了Bob外所有的物体}/**生成关卡中除了Bob外所有的物体**/private void generateLevel() {float y = Platform.PLATFORM_HEIGHT / 2;float maxJumpHeight = Bob.BOB_JUMP_VELOCITY * Bob.BOB_JUMP_VELOCITY / (2 * -gravity.y);while (y < WORLD_HEIGHT - WORLD_WIDTH / 2) {int type = rand.nextFloat() > 0.8f ? Platform.PLATFORM_TYPE_MOVING : Platform.PLATFORM_TYPE_STATIC;float x = rand.nextFloat() * (WORLD_WIDTH - Platform.PLATFORM_WIDTH) + Platform.PLATFORM_WIDTH / 2;//跳板的位置Platform platform = new Platform(type, x, y);platforms.add(platform);//弹簧的位置if (rand.nextFloat() > 0.9f && type != Platform.PLATFORM_TYPE_MOVING) {Spring spring = new Spring(platform.position.x, platform.position.y + Platform.PLATFORM_HEIGHT / 2+ Spring.SPRING_HEIGHT / 2);springs.add(spring);}//松鼠的位置if (y > WORLD_HEIGHT / 3 && rand.nextFloat() > 0.8f) {Squirrel squirrel = new Squirrel(platform.position.x + rand.nextFloat(), platform.position.y+ Squirrel.SQUIRREL_HEIGHT + rand.nextFloat() * 2);squirrels.add(squirrel);}//金币的位置if (rand.nextFloat() > 0.6f) {Coin coin = new Coin(platform.position.x + rand.nextFloat(), platform.position.y + Coin.COIN_HEIGHT+ rand.nextFloat() * 3);coins.add(coin);}//游戏中的物体的位置根据跳板的位置来确定y += (maxJumpHeight - 0.5f);y -= rand.nextFloat() * (maxJumpHeight / 3);}//城堡的位置是确定的castle = new Castle(WORLD_WIDTH / 2, y);}/**刷新界面**/public void update(float deltaTime, float accelX) {updateBob(deltaTime, accelX);  //刷新主角updatePlatforms(deltaTime);  //刷新跳板updateSquirrels(deltaTime);  //刷新松鼠updateCoins(deltaTime);  //刷新金币if (bob.state != Bob.BOB_STATE_HIT) checkCollisions();//游戏结束判断checkGameOver();}/**碰撞检测**/private void checkCollisions() {// TODO Auto-generated method stubcheckPlatformCollisions();  //跳板的碰撞checkSquirrelCollisions();  //松鼠的碰撞checkItemCollisions();   //金币和弹簧的碰撞checkCastleCollisions();  //城堡的碰撞}/**跳板碰撞**/private void checkPlatformCollisions() {if (bob.velocity.y > 0) return;int len = platforms.size();for (int i = 0; i < len; i++) {Platform platform = platforms.get(i);if (bob.position.y > platform.position.y) {//调用工具类中矩形块碰撞检测if (OverlapTester.overlapRectangles(bob.bounds, platform.bounds)) {bob.hitPlatform();listener.jump();if (rand.nextFloat() > 0.5f) {platform.pulverize();}break;}}}}/**松鼠碰撞**/private void checkSquirrelCollisions () {int len = squirrels.size();for (int i = 0; i < len; i++) {Squirrel squirrel = squirrels.get(i);if (OverlapTester.overlapRectangles(squirrel.bounds, bob.bounds)) {bob.hitSquirrel();listener.hit();}}}/**金币和弹簧碰撞**/private void checkItemCollisions () {int len = coins.size();for (int i = 0; i < len; i++) {Coin coin = coins.get(i);if (OverlapTester.overlapRectangles(bob.bounds, coin.bounds)) {coins.remove(coin);len = coins.size();listener.coin();score += Coin.COIN_SCORE;  //加分}}if (bob.velocity.y > 0) return;  //若是上升状态不去考虑碰撞检测len = springs.size();for (int i = 0; i < len; i++) {Spring spring = springs.get(i);if (bob.position.y > spring.position.y) {//弹簧的碰撞检测if (OverlapTester.overlapRectangles(bob.bounds, spring.bounds)) {bob.hitSpring();listener.highJump();}}}}/**城堡的碰撞**/private void checkCastleCollisions () {if (OverlapTester.overlapRectangles(castle.bounds, bob.bounds)) {state = WORLD_STATE_NEXT_LEVEL;}}/**刷新Bob**/private void updateBob(float deltaTime, float accelX) {//碰撞跳板if (bob.state != Bob.BOB_STATE_HIT && bob.position.y <= 0.5f) bob.hitPlatform();//主角x轴方向移动的速度if (bob.state != Bob.BOB_STATE_HIT) bob.velocity.x = -accelX / 10 * Bob.BOB_MOVE_VELOCITY;bob.update(deltaTime);//竖直最大高度heightSoFar = Math.max(bob.position.y, heightSoFar);}/**刷新跳板**/private void updatePlatforms(float deltaTime) {int len = platforms.size();for (int i = 0; i < len; i++) {Platform platform = platforms.get(i);//取出集合中的跳板对象，调用其自身的刷新方法platform.update(deltaTime);//若状态为破碎状态，将该跳板对象移除出去if (platform.state == Platform.PLATFORM_STATE_PULVERIZING && platform.stateTime > Platform.PLATFORM_PULVERIZE_TIME) {platforms.remove(platform);len = platforms.size();}}}/**刷新松鼠**/private void updateSquirrels (float deltaTime) {int len = squirrels.size();for (int i = 0; i < len; i++) {Squirrel squirrel = squirrels.get(i);squirrel.update(deltaTime);}}/**刷新金币**/private void updateCoins (float deltaTime) {int len = coins.size();for (int i = 0; i < len; i++) {Coin coin = coins.get(i);coin.update(deltaTime);}}/**游戏结束判断**/private void checkGameOver () {//目前的Bob的高度小于场景的高度if (heightSoFar - 7.5f > bob.position.y) {state = WORLD_STATE_GAME_OVER;}}
}

       看着代码挺多，其实就是一个update()和checkCollisions（），还有重要的generateLevel（）。接下来就是渲染WorldRenderer类中绘制各个物体

/**渲染游戏中各种物体（Bob,跳板，松鼠，弹簧，城堡，金币）**/private void renderObjects() {batch.enableBlending();batch.begin();renderPlatforms(); //绘制跳板renderBob(); //绘制主角renderItems();  //绘制金币和弹簧renderSquirrels();  //绘制松鼠renderCastle();  //绘制城堡batch.end();}

   由于代码过多，这里就不一一贴出来了，大家可以自行参考源码，有注解的哦!

既然添加了游戏中的物体，那自然又得在Asset中加载资源

声明：

//游戏中各种物体public static TextureRegion platform;  //跳板public static Animation brakingPlatform;  //破碎的跳板（动画）//主角public static Animation bobJump;  //跳跃（动画）public static Animation bobFall;  //下落（动画）public static TextureRegion bobHit;  //碰撞图片public static TextureRegion spring; //弹簧public static TextureRegion castle; //城堡public static Animation coinAnim;  //金币 （动画）public static Animation squirrelFly;  //飞着的松鼠 （动画）

实例化：

//游戏中各个物体platform = new TextureRegion(items, 64, 160, 64, 16);  //跳板brakingPlatform = new Animation(0.2f, new TextureRegion(items, 64, 160, 64, 16), new TextureRegion(items, 64, 176, 64, 16),new TextureRegion(items, 64, 192, 64, 16), new TextureRegion(items, 64, 208, 64, 16));//破碎的跳板spring = new TextureRegion(items, 128, 0, 32, 32);  //弹簧castle = new TextureRegion(items, 128, 64, 64, 64);  //城堡coinAnim = new Animation(0.2f, new TextureRegion(items, 128, 32, 32, 32), new TextureRegion(items, 160, 32, 32, 32),new TextureRegion(items, 192, 32, 32, 32), new TextureRegion(items, 160, 32, 32, 32));  //金币squirrelFly = new Animation(0.2f, new TextureRegion(items, 0, 160, 32, 32), new TextureRegion(items, 32, 160, 32, 32)); //飞着的松鼠//主角bobJump = new Animation(0.2f, new TextureRegion(items, 0, 128, 32, 32), new TextureRegion(items, 32, 128, 32, 32));bobFall = new Animation(0.2f, new TextureRegion(items, 64, 128, 32, 32), new TextureRegion(items, 96, 128, 32, 32));bobHit = new TextureRegion(items, 128, 128, 32, 32);

   运行一下代码，我们发现，我们操作者主角向上移动，会遇到弹簧，会破碎的跳板，飞着的松鼠，金币，一切都正常的运行着！ 仔细一看，加上金币后分数值没有改变哦！当然还有死亡的判断，音效的加入等等。

效果图：

在此先做一个代码版本，方便初学者能够清楚的了解代码

×××：http://down.51cto.com/data/897211

下面我们来完成分值的计算：

在GameScreen中：

/**游戏运行状态**/private void updateRunning (float deltaTime) {if (Gdx.input.justTouched()) {guiCam.unproject(touchPoint.set(Gdx.input.getX(), Gdx.input.getY(), 0));//点击暂停if (OverlapTester.pointInRectangle(pauseBounds, touchPoint.x, touchPoint.y)) {Assets.playSound(Assets.clickSound);state = GAME_PAUSED;return;}}ApplicationType appType = Gdx.app.getType();// should work also with Gdx.input.isPeripheralAvailable(Peripheral.Accelerometer)if (appType == ApplicationType.Android || appType == ApplicationType.iOS) {world.update(deltaTime, Gdx.input.getAccelerometerX());} else {float accel = 0;if (Gdx.input.isKeyPressed(Keys.DPAD_LEFT)) accel = 5f;if (Gdx.input.isKeyPressed(Keys.DPAD_RIGHT)) accel = -5f;world.update(deltaTime, accel);}//当前分数（变化）if (world.score != lastScore) {lastScore = world.score;scoreString = "SCORE: " + lastScore;}//本关结束if (world.state == World.WORLD_STATE_NEXT_LEVEL) {state = GAME_LEVEL_END;}//游戏结束，分值计算if (world.state == World.WORLD_STATE_GAME_OVER) {state = GAME_OVER;if (lastScore >= Settings.highscores[4])scoreString = "NEW HIGHSCORE: " + lastScore;elsescoreString = "SCORE: " + lastScore;//获取最后分数Settings.addScore(lastScore);//保存分数Settings.save();}}

   这里我们每次碰到金币就会加上10分，到游戏结束后，将最终得分保存起来，同时更新排行榜。

Settings：

package com.zhf.mylibgdx;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import com.badlogic.gdx.Gdx;
/*** 设置类：三个方法： 1.load()读取声音开关和最高分.  2.save()保存配置     3.addScore()最高分排行榜，对数组赋值。* @author ZHF**/
public class Settings {//记录声音开起与关闭public static boolean soundEnabled = true;//默认分数排行榜分数public final static int[] highscores = new int[] {100, 80, 50, 30, 10};//保存的文件名public final static String file = ".superjumper";/**加载配置文件**/public static void load () {BufferedReader in = null;try {in = new BufferedReader(new InputStreamReader(Gdx.files.external(file).read()));soundEnabled = Boolean.parseBoolean(in.readLine());for (int i = 0; i < 5; i++) {highscores[i] = Integer.parseInt(in.readLine());}} catch (Exception e) {e.printStackTrace();} finally {try {if (in != null) in.close();} catch (IOException e) {}}}/**保存分值**/public static void save () {BufferedWriter out = null;try {//声音的开关out = new BufferedWriter(new OutputStreamWriter(Gdx.files.external(file).write(false)));out.write(Boolean.toString(soundEnabled));for (int i = 0; i < 5; i++) {//将分数写入文件out.write(Integer.toString(highscores[i]));}} catch (Exception e) {e.printStackTrace();} finally {try {if (out != null) out.close();} catch (IOException e) {}}}/**将所得分数与排行榜分数比较，从高到低重新排一下**/public static void addScore (int score) {for (int i = 0; i < 5; i++) {if (highscores[i] < score) {for (int j = 4; j > i; j--)highscores[j] = highscores[j - 1];highscores[i] = score;break;}}}
}

   再次运行代码，加了几个金币，分值发生变化了，回到主界面分数排行榜也发生变化了！（原先默认：100, 80, 50, 30, 10）

接下来就是声音部分:

我们再次回到GameScreen中：

//实例化场景worldListener = new WorldListener() {@Overridepublic void jump () {Assets.playSound(Assets.jumpSound);}@Overridepublic void highJump () {Assets.playSound(Assets.highJumpSound);}@Overridepublic void hit () {Assets.playSound(Assets.hitSound);}@Overridepublic void coin () {Assets.playSound(Assets.coinSound);}};

   在监听器中给对应方法播放对应的声音，当然少不了在Asset中添加对声音资源的加载：

声明：

//声音部分public static Sound clickSound; //按下音效public static Music music;  //背景音乐public static Sound jumpSound; //跳跃public static Sound highJumpSound; //高跳public static Sound hitSound; //碰撞public static Sound coinSound;  //金币

实例化：

//背景音乐music = Gdx.audio.newMusic(Gdx.files.internal("data/music.mp3"));music.setLooping(true); //循环music.setVolume(0.5f);  //大小if (Settings.soundEnabled) music.play();jumpSound = Gdx.audio.newSound(Gdx.files.internal("data/jump.ogg"));highJumpSound = Gdx.audio.newSound(Gdx.files.internal("data/highjump.ogg"));hitSound = Gdx.audio.newSound(Gdx.files.internal("data/hit.ogg"));coinSound = Gdx.audio.newSound(Gdx.files.internal("data/coin.ogg"));//点击音效clickSound = Gdx.audio.newSound(Gdx.files.internal("data/click.ogg"));

ok！运行一下！貌似没有什么问题，对应的声音都播放出来了！

  到此为止，libgdx中demo程序superjumper分版本的学习就结束了，由于本人也是边学边总结，中间肯定有许多地方讲解的不完善，不妥的地方，这里先想大家说声抱歉哈，希望大家发现问题能及时提出来，这样我也能进步么！这里还是那句话，在学习新东西的时候，我们的不求甚解也不失为一种快速掌握的好方法！ 希望这一些列学习笔记能帮助到初学者！

完整代码下载：http://down.51cto.com/data/897232  代码里详细注解哦！