33     public GameObject mBackgroundObject;  field in LevelSystem
50         if (mBackgroundObject != null && mRoot != null) {  in reset()
51             mBackgroundObject.removeAll();  in reset()
52             mBackgroundObject.commitUpdates();  in reset()
53             mRoot.remove(mBackgroundObject);  in reset()
54             mBackgroundObject = null;  in reset()
136                             if (mBackgroundObject == null) {  in loadLevel()
137                                 mBackgroundObject =   in loadLevel()
142                                 root.add(mBackgroundObject);  in loadLevel()
146                             builder.addTileMapLayer(mBackgroundObject, currentPriority,   in loadLevel()
177                 sSystemRegistry.levelBuilder.promoteForegroundLayer(mBackgroundObject);  in loadLevel()