我有一个 Recyclerview，允许用户通过向上滑动来更改比例，我为此使用gestureDetector 和 onFling，这工作正常，但是用户应该能够单击 recyclerView 的项目，我通过创建一个界面来做到这一点RecyclerView 并单击“活动”中的“活动”，但现在向上滑动时出现此错误。
java.lang.NullPointerException：指定为非空的参数为空：方法 kotlin.jvm.internal.Intrinsics.checkNotNullParameter，参数 e1 位于 com.example.simmone.utils.SwipeServices$GestureListener.onFling（未知来源：2）位于 android .view.GestureDetector.onTouchEvent(GestureDetector.java:763) 在 com.example.simmone.utils.SwipeServices.onTouch(SwipeServices.kt:33)
SwipeService.kt
class SwipeServices : View.OnTouchListener {
enum class SwipeDirection {
bottomToTop
}
private var rootLayout: ViewGroup? = null
private var layoutToShowHide: ViewGroup? = null
private var gestureDetector: GestureDetector? = null
private var swipeDirections: MutableList<SwipeDirection>? = null
fun initialize(rootLayout: ViewGroup, layoutToShowHide:ViewGroup?, swipeDirections: MutableList<SwipeDirection>,maxSwipeDistance: Int = 1) {
val gestureListener = GestureListener()
gestureDetector = GestureDetector(rootLayout.context, gestureListener)
this.rootLayout = rootLayout
this.layoutToShowHide = layoutToShowHide
this.swipeDirections = swipeDirections
gestureListener.MAX_SWIPE_DISTANCE …android ontouchlistener onfling gesturedetector android-recyclerview