全屏的实现是不是反了？

inline var Activity.isFullScreen: Boolean
  get() = window.decorView.rootWindowInsetsCompat?.isVisible(WindowInsetsCompat.Type.systemBars()) == true
  set(value) {
    window.decorView.windowInsetsControllerCompat?.run {
      val systemBars = WindowInsetsCompat.Type.systemBars()
      if (value) show(systemBars) else hide(systemBars)
    }
  }