[AndEngine学习教程] 第2节 使用AndEngine.jar创建工程

1.回顾

       在上一节已经成功的导入AndEngine源代码项目,我们就利用它来实现我们的工程.lib文件在bin目录下:

 

2.建立工程

     在eclipse下file->new->project...->Android Application Project

 

 点击next

设置工程明等参数,例如:MoveBall,为了兼容工程版本,将SDk版本修改为2.1,如图所示:

 

接着下一步,可以随便选择你要的图标

 

然后next ....finish就完成了初始工程的创建

 

3.修改原始工程

 鼠标放在MoveBall项目上,右键选择Build Path->Configure build path

然后选择Projects,点击右边的Add.选择上AndEngine

点击OK就可以将AndEngine项目添加到工程了

打开MoveBall,java,将MoveBall extends Activity修改为MoveBall extends BaseGameActivity.

接着写代码:

 package season.lxx.moveball;


 import org.andengine.engine.camera.Camera;
 import org.andengine.engine.options.EngineOptions;
 import org.andengine.engine.options.ScreenOrientation;
 import org.andengine.engine.options.resolutionpolicy.IResolutionPolicy;
 import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
 import org.andengine.entity.scene.Scene;
 import org.andengine.entity.scene.background.RepeatingSpriteBackground;
 import org.andengine.entity.sprite.AnimatedSprite;
 import org.andengine.entity.sprite.TiledSprite;
 import org.andengine.entity.sprite.vbo.ITiledSpriteVertexBufferObject;
 import org.andengine.opengl.texture.TextureOptions;
 import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlas;
 import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlasTextureRegionFactory;
 import org.andengine.opengl.texture.atlas.bitmap.source.AssetBitmapTextureAtlasSource;
 import org.andengine.opengl.texture.region.ITiledTextureRegion;
 import org.andengine.opengl.texture.region.TiledTextureRegion;
 import org.andengine.opengl.vbo.VertexBufferObjectManager;
 import org.andengine.ui.activity.BaseGameActivity;

 import android.app.Activity;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.support.v4.app.NavUtils;

 public class MoveBall extends BaseGameActivity {

     private static final int CAMERA_WIDTH = 800;
     private static final int CAMERA_HEIGHT = 480;
     private final static float BALL_VELOCITY = 100f;//球的移动速度

     private Camera mCamera;
     private Scene mScene;
     private RepeatingSpriteBackground background;
     private TiledTextureRegion mFaceTextureRegion;

     @Override
     public EngineOptions onCreateEngineOptions() {
         // TODO Auto-generated method stub

         mCamera = new Camera(0,0,CAMERA_WIDTH,CAMERA_HEIGHT);
         EngineOptions mEngineOptions = new EngineOptions(true, ScreenOrientation.LANDSCAPE_SENSOR, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera);

         return mEngineOptions;
     }

     @Override
     public void onCreateResources(
             OnCreateResourcesCallback pOnCreateResourcesCallback)
             throws Exception {
         // TODO Auto-generated method stub
         this.background = new RepeatingSpriteBackground(CAMERA_WIDTH, CAMERA_HEIGHT,
                    getTextureManager(), AssetBitmapTextureAtlasSource.create(
                     this.getAssets(), "background.png"),
                     getVertexBufferObjectManager());


         BitmapTextureAtlas mTexture = new BitmapTextureAtlas(getTextureManager(),64,32,TextureOptions.BILINEAR_PREMULTIPLYALPHA);
         mFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture, this, "face_circle_tiled.png", 0, 0,2,1);

         /**
          * 参数说明:
          * mTexure是在内存中放置贴图资源用的,64,32是图片要求的宽和高,必须是2的n次方大小.如:2,4,8,16,32,64,128,512,1024....
          * 并且要比原图的宽高要大
          *
          * mFaceTextureRegion相当于从mTexure中扣图,因为mTexure是由很多图集组成的,要从中截取一片出来
          * 0,0代表截图的top,right坐标(起点坐标),2和1分别代表贴图中一张存在2列1行
          *
          */
         mTexture.load();

         pOnCreateResourcesCallback.onCreateResourcesFinished();
     }

     @Override
     public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback)
             throws Exception {
         // TODO Auto-generated method stub
         mScene = new Scene();
         mScene.setBackground(background);

         final float centerX = (CAMERA_WIDTH - mFaceTextureRegion.getWidth()) / 2;//计算贴图的中心坐标
         final float centerY = (CAMERA_HEIGHT - mFaceTextureRegion.getHeight()) / 2;
         final Ball mBall = new Ball(centerX, centerY,32, 32,this.mFaceTextureRegion,getVertexBufferObjectManager());

         mScene.attachChild(mBall);
         pOnCreateSceneCallback.onCreateSceneFinished(mScene);
     }

     @Override
     public void onPopulateScene(Scene pScene,
             OnPopulateSceneCallback pOnPopulateSceneCallback) throws Exception {
         // TODO Auto-generated method stub



         pOnPopulateSceneCallback.onPopulateSceneFinished();
     }


     private static class Ball extends AnimatedSprite{


         float mVelocityX = BALL_VELOCITY;//球的x方向速度
         float mVelocityY = BALL_VELOCITY ;//球的y方向速度

         public Ball(float pX, float pY, float pWidth, float pHeight,
                 ITiledTextureRegion pTiledTextureRegion,
                 VertexBufferObjectManager pVertexBufferObjectManager) {
             super(pX, pY, pWidth, pHeight, pTiledTextureRegion, pVertexBufferObjectManager);
             // TODO Auto-generated constructor stub
             mX = 100;
             mY = 100;
         }

         @Override
         protected void onManagedUpdate(float pSecondsElapsed) {
             // TODO Auto-generated method stub

                 if(this.mX < 0) {
                     setVelocityX(BALL_VELOCITY);
                 } else if(  this.mX + this.getWidth() > CAMERA_WIDTH){
                     setVelocityX(-BALL_VELOCITY);

                 }

                 if(this.mY < 0 ) {
                     setVelocityY(BALL_VELOCITY);
                 } else if(this.mY + this.getHeight() > CAMERA_HEIGHT){
                     setVelocityY(-BALL_VELOCITY);
                 }



                 mX += mVelocityX * pSecondsElapsed;
                 mY += mVelocityY * pSecondsElapsed;


                 this.setPosition(mX, mY);
             Log.d("Season",pSecondsElapsed + "");

             super.onManagedUpdate(pSecondsElapsed);


         }

         void setVelocityX(float vx){

             mVelocityX = vx;
         }


         void setVelocityY(float vy){
             mVelocityY = vy;
         }




     }


 }

很重要的一步,为了让游戏顺利运行,一定要将AndEngine/bin/andengine.jar拷贝到MoveBall/libs下

本例子用到两张图片:

把这两张图片拷贝到MoveBall/assets目录下

然后运行就可以看到一个运动的小脸蛋了.呵呵

本例子源代码:http://download.csdn.net/detail/cen616899547/4701606