RecyclerView在Fragment | Kotlin | Firebase上不起作用

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

val recyclerView: RecyclerView = view.findViewById(R.id.recyclerView)
recyclerView.layoutManager = LinearLayoutManager(context)
recyclerView.adapter = MyAdapter(dataList)

class MyAdapter(private val dataList: List<Data>) : RecyclerView.Adapter<MyAdapter.ViewHolder>() {
    // 实现 onCreateViewHolder、onBindViewHolder、getItemCount等方法
    // ...
}

class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
    fun bind(data: Data) {
        // 绑定数据到列表项的视图控件
        // ...
    }
}

val database = FirebaseDatabase.getInstance()
val myRef = database.getReference("data")
myRef.addValueEventListener(object : ValueEventListener {
    override fun onDataChange(dataSnapshot: DataSnapshot) {
        val dataList = dataSnapshot.children.mapNotNull { it.getValue(Data::class.java) }
        recyclerView.adapter = MyAdapter(dataList)
    }
    override fun onCancelled(error: DatabaseError) {
        // 处理取消事件
    }
})