Kotlin旋轉影片不起作用。單擊spinBtn時什么也沒有發生

***我正在嘗試在按下按鈕后使用我的 imageView 旋轉來創建 af spinWheel 影片。我找到了一個 YouTube 視頻，其中包含一些我轉換為 kotlin 的 Java 代碼。當按下按鈕時，下面的代碼沒有任何反應。到目前為止，我已經在 GameViewModel 中使用了 rotateAnimation 類和一些計算，并在 GameFragment 類的 onCreateView() 中呼叫了 spin()。

下面的代碼是我用于 rotateAnimation 的兩個類，但它似乎不起作用。我不確定哪個部分是問題。有人知道嗎？***

類 GameViewModel : ViewModel() {

private val fields = arrayOf("1","2","3","4","5","6","7")
private val fieldDegrees = IntArray(fields.size)
private var degree = 0
var isSpinning = false


fun getDegreesForSectors(){
    val oneFieldsDegrees = 360/fields.size
    for (i in fields.indices){
        fieldDegrees[i] = (i 1) * oneFieldsDegrees
    }
}


fun spin(imageView: ImageView){
    isSpinning = true
    degree = (0..fields.size).random()

    val rotateAnimation = RotateAnimation(0.toFloat(),
        (360 * fields.size   fieldDegrees[degree]).toFloat(),
        RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f)

    rotateAnimation.setDuration(3600)
    rotateAnimation.setFillAfter(true)
    rotateAnimation.setInterpolator(DecelerateInterpolator())
    rotateAnimation.setAnimationListener(object : Animation.AnimationListener{

        override fun onAnimationStart(animation: Animation) {}

        override fun onAnimationEnd(animation: Animation) {
            isSpinning = false
        }
        override fun onAnimationRepeat(animation: Animation) {}

    })
    imageView.startAnimation(rotateAnimation)
}

}

類游戲片段：片段（）{

private lateinit var gameViewModel: GameViewModel
private var _binding: GameFragmentBinding? = null

// This property is only valid between onCreateView and
// onDestroyView.
private val binding get() = _binding!!


override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View {

    gameViewModel =
        ViewModelProvider(this).get(GameViewModel::class.java)


    val spinBtn: Button? = view?.findViewById(R.id.spinBtn)
    val wheelImage: ImageView? = view?.findViewById(R.id.Spinning_Wheel)
    gameViewModel.getDegreesForSectors()
    spinBtn?.setOnClickListener() {
        if (!gameViewModel.isSpinning) {
            gameViewModel.spin(wheelImage!!)
        }
    }


  _binding = GameFragmentBinding.inflate(inflater, container, false)
  val root: View = binding.root
  return root



}

override fun onDestroyView() {
    super.onDestroyView()
    _binding = null
}

}

uj5u.com熱心網友回復：

您正在訪問viewonCreateView() 內的片段。這將回傳 null，因為尚未膨脹。使用系結變數訪問視圖。

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View {

    gameViewModel = ViewModelProvider(this).get(GameViewModel::class.java)

    _binding = GameFragmentBinding.inflate(inflater, container, false)

    gameViewModel.getDegreesForSectors()
    binding.spinBtn.setOnClickListener() {
        if (!gameViewModel.isSpinning) {
            gameViewModel.spin(binding.spinningWheel)
        }
    }

  return binding.root
}

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