Kotlin SurfaceView / lateinit 属性 surface 尚未初始化

问：

我仍然很青涩，不知道该语言的一些功能。我在这里遇到以下问题是我的代码：

private lateinit var surface: SurfaceView
private var _binding: FragmentItem2Binding? = null
private val binding get() = _binding!!

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
    ): View? {
    _binding = FragmentItem2Binding.inflate(inflater, container, false)
    return binding.root

     }


override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    surface?.findViewById<SurfaceView>(R.id.surf)
        this.surface!!.holder!!.addCallback(object : SurfaceHolder.Callback {
            override fun surfaceCreated(holder: SurfaceHolder) {
               TODO("Not yet implemented")
            }

            override fun surfaceChanged(
               holder: SurfaceHolder,
               format: Int,
               width: Int,
               height: Int,
            ) {
               TODO("Not yet implemented")
            }

            override fun surfaceDestroyed(holder: SurfaceHolder) {
               TODO("Not yet implemented")
            }
        })

xml格式：

\<SurfaceView
    android:layout_width="400sp"
    android:layout_height="400sp"
    android:id="@+id/surf"
\\\>

如果我把：

lateinit var

它给出：

kotlin.UninitializedPropertyAccessException: lateinit property surface has not been initialized

如果我把：

private var surface: SurfaceView? = null

它给出了错误：java.lang.NullPointerException

我该怎么办？