andengine背景滚动循环

      package com.testsprite;

import org.anddev.andengine.engine.Engine;
import org.anddev.andengine.engine.camera.Camera;
import org.anddev.andengine.engine.options.EngineOptions;
import org.anddev.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
import org.anddev.andengine.entity.scene.Scene;
import org.anddev.andengine.entity.scene.background.AutoParallaxBackground;
import org.anddev.andengine.entity.scene.background.ParallaxBackground;
import org.anddev.andengine.entity.sprite.Sprite;
import org.anddev.andengine.opengl.texture.Texture;
import org.anddev.andengine.opengl.texture.region.TextureRegion;
import org.anddev.andengine.opengl.texture.region.TextureRegionFactory;
import org.anddev.andengine.ui.activity.BaseGameActivity;


public class TestSprite extends BaseGameActivity {

    final int CAMERA_WIDTH  = 480;
    final int CAMERA_HEIGHT = 800;

    Camera mCamera = null;
    Scene mMainScene = null;
    AutoParallaxBackground mBackground = new AutoParallaxBackground(0,0,0,5);

    @Override
    public Engine onLoadEngine() {
        mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
        return new Engine(new EngineOptions(true,
                EngineOptions.ScreenOrientation.PORTRAIT,
                new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera).setNeedsSound(true));  //To change body of implemented methods use File | Settings | File Templates.
    }

    @Override
    public void onLoadResources() {
        //To change body of implemented methods use File | Settings | File Templates.
    }

    @Override
    public Scene onLoadScene() {

        mMainScene = new Scene(2);
        Texture texture = new Texture(2048,128);
        TextureRegion region = TextureRegionFactory.createFromAsset(texture,this,"bg_snow_cycle.png",0,0);
        Sprite snowSprite1 = new Sprite(0,70,region);
        mEngine.getTextureManager().loadTexture(texture);
        mBackground.addParallaxEntity(new ParallaxBackground.ParallaxEntity(-10,snowSprite1));

        mMainScene.setBackground(mBackground);
        return mMainScene;  //To change body of implemented methods use File | Settings | File Templates.
    }

    @Override
    public void onLoadComplete() {
        //To change body of implemented methods use File | Settings | File Templates.
    }
}