目前，我正在Android上使用cocos2d，想用CCParallaxNode在屏幕上添加无限滚动的背景。添加背景图片等操作过程都可以顺利完成，但是一旦启动程序，就会出现黑屏，这是什么原因呢？
我使用的代码如下：
CCParallaxNode parallaxNode;CCSprite spacedust1;CCSprite spacedust2;CCSprite planetsunrise;CCSprite galaxy;CCSprite spacialanomaly;CCSprite spacialanomaly2;parallaxNode = CCParallaxNode.node(); spacedust1 = CCSprite.sprite("bg_front_spacedust.png"); spacedust2 = CCSprite.sprite("bg_front_spacedust.png"); planetsunrise = CCSprite.sprite("bg_planetsunrise.png"); galaxy = CCSprite.sprite("bg_galaxy.png"); spacialanomaly = CCSprite.sprite("bg_spacialanomaly.png"); spacialanomaly2 = CCSprite.sprite("bg_spacialanomaly2.png"); // 3) Determine relative movement speeds for space dust and background // CGPoint cgPoint = CGPoint.ccp(0.1, 0.1); CGPoint dustSpeed = CGPoint.ccp(10, 10); CGPoint bgSpeed = CGPoint.ccp(5, 5); // CGPoint bgSpeed = ccp(0.05, 0.05); parallaxNode.addChild(spacedust1, 0, dustSpeed.x, dustSpeed.y, 0, winSize.height / 2); parallaxNode.addChild(spacedust2, 0, dustSpeed.x, dustSpeed.y, spacedust1.getContentSize().width, winSize.height / 2); parallaxNode.addChild(galaxy, -1, bgSpeed.x, bgSpeed.y, 0, 10); parallaxNode.addChild(planetsunrise, -1, bgSpeed.x, bgSpeed.y, 600, 5); parallaxNode .addChild(spacialanomaly, -1, bgSpeed.x, bgSpeed.y, 900, 20); parallaxNode.addChild(spacialanomaly2, -1, bgSpeed.x, bgSpeed.y, 1500, 30); CCIntervalAction go = CCMoveBy.action(4, CGPoint.ccp(winSize.width, 0)); CCIntervalAction goBack = go.reverse(); CCIntervalAction seq = CCSequence.actions(go, goBack); CCRepeatForever action = CCRepeatForever.action(goBack); parallaxNode.runAction(action);解决方案
答：A M
在github上，我找到了类似的解答源码，因此可以在Constructor中调用如下方法：
private void endlessBackground() { // Create the two background sprites which will alternate _oddBackground = CCSprite.sprite("blue_background.png"); _evenBackground = CCSprite.sprite("blue_background.png"); // One starts dead centre and one starts exactly one screen height above oddBackground.setPosition(_winSize.width / 2, _winSize.height / 2); evenBackground.setPosition(_winSize.width / 2, _winSize.height + (_winSize.height / 2)); // Schedule the scrolling action schedule("scroll"); // Add sprites to the layer addChild(_oddBackground).addChild(_evenBackground);}public void scroll(float dt) { // move them 100*dt pixels down _oddBackground.setPosition(_oddBackground.getPosition().x, _oddBackground.getPosition().y - 150 * dt); _evenBackground.setPosition(_evenBackground.getPosition().x, _evenBackground.getPosition().y - 150 * dt); // reset position when they are off from view. if (_oddBackground.getPosition().y < -_winSize.height / 2) { _oddBackground.setPosition(_winSize.width / 2, _winSize.height / 2); _evenBackground.setPosition(_winSize.width / 2, _winSize.height + (_winSize.height / 2)); }}}答：M.Tahir Ashraf
可以尝试如下代码：
CCTexture2D *texture = CCTextureCache::sharedTextureCache()->addImage("pic.png");ccTexParams params = {GL_LINEAR, GL_LINEAR, GL_REPEAT, GL_REPEAT};texture->setTexParameters(¶ms);CCSprite *sprite = CCSprite::spriteWithTexture(texture, CCRectMake(0, 0, 90, 90));同时，一定要保证图片的高度和宽度都是2的幂。
答：Oleg Vaskevich
似乎CCRepeatForever action只能运行goBack的指令，这就意味着运行是不可逆的，所以可以尝试如下代码：
CCIntervalAction go = CCMoveBy.action(4, CGPoint.ccp(winSize.width, 0));CCIntervalAction goBack = go.reverse();CCIntervalAction seq = CCSequence.actions(go, goBack);CCRepeatForever action = CCRepeatForever.action(seq); // change to seq instead of goBackparallaxNode.runAction(action);