AndEngine 分析之五-----Scene
Scene:
The Scene class is the root container for all objects to be drawn on the screen. A Scene has a specific amount of Layers, which themselves can contain a (fixed or dynamic) amount of Entities. There are subclasses, like the CameraScene/HUD/MenuScene that are drawing themselves to the same position of the Scene no matter where the camera is positioned to.
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Scene是屏幕上所有对象的根容器，它有许多的曾用来包含其他实体，它可以有许多特定的子类。
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一般情况下继承BaseGameActivity的类会覆写onLoadScene（）方法
