@Override
public void initialize(AppStateManager stateManager, Application app) {
if (!super.isInitialized()){
InputManager inputManager = app.getInputManager();
inputManager.addMapping("ScreenShot", new KeyTrigger(KeyInput.KEY_SYSRQ));
inputManager.addListener(this, "ScreenShot");
List<ViewPort> vps = app.getRenderManager().getPostViews();
ViewPort last = vps.get(vps.size()-1);
last.addProcessor(this);