private void fire() {
municion--;
BulletActor bullet = new BulletActor(stage, this, 250);
float x = getX() - 8 + getWidth() / 2;
float y = getY() + getHeight() - 10;
bullet.setPosition(x, y);
stage.addActor(bullet);
bullets.add(bullet);
if (GameplayScreen.isSonidoEfectos())
AlienChase.MANAGER.get("sound/shoot.ogg", Sound.class).play();
}