片段中的Lateinit属性尚未初始化

Question

当变量只在OnCreate中声明时，为什么我的片段不进入onCreateView？

class BeatBoxFragment : Fragment() {

    private lateinit var beatBox: BeatBox

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        var beatBox = BeatBox(requireContext())
        Log.d("Crashing", beatBox.toString() + " has been created, yer program does not go into onCreateView")
    }
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
    //var beatBox = BeatBox(requireContext())
    Log.d("Crashing", "The program does not enter onCreateView unless I uncomment the beatBox definition!)

    }

}

Answer 1

问题是...重新声明beatbox:

private lateinit var beatBox: BeatBox

fun test() {
    var beatBox = BeatBox() // Create new beatbox for `test() scope`.
                            // beatBox for class scope is still uninitialized.
}

因此，只需去掉oncreate中的var关键字；）