我想用来自Firebase的数据填充RecyclerView。我尝试了一些方法，我构建了一个适配器，并尝试填充RecyclerView，但在RecyclerView中没有显示任何数据，我没有得到任何错误。
在firebase控制台中显示查询正在工作，但在模拟器中没有显示任何内容，也没有格尔错误。
[！[模拟器中的循环视图][1]][1]

我的布局：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".CamionesActivos">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvCamioness"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginStart="10dp"
        android:layout_marginTop="7dp"
        android:layout_marginEnd="10dp"
        android:layout_marginBottom="7dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:listitem="@layout/tarjeta_recycler" />
</androidx.constraintlayout.widget.ConstraintLay

我的适配器：

class AdaptadorCamiones(private val camionlist:ArrayList<datos>)
    :RecyclerView.Adapter<AdaptadorCamiones.MyViewHolder>() {
    class MyViewHolder(itemView: View):RecyclerView.ViewHolder(itemView){
        val placa :TextView?=itemView.findViewById(R.id.tvPlacaDato)
        val peso: TextView?=itemView.findViewById(R.id.tvPesoDato)

    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val itemView=
            LayoutInflater.from(parent.context).inflate(R.layout.activity_camiones_activos,parent,false)
        return MyViewHolder(itemView)
    }

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        holder.placa?.text ?: camionlist[position].Placa
        holder.peso?.text ?: camionlist[position].Peso
    }

    override fun getItemCount(): Int {
        return camionlist.size
    }
}

我的活动：

class CamionesActivos : AppCompatActivity() {
    private lateinit var recyclerView: RecyclerView
    private lateinit var camionList: ArrayList<datos>
    private var db=Firebase.firestore

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_camiones_activos)
        recyclerView=findViewById(R.id.rvCamioness)
        recyclerView.layoutManager=LinearLayoutManager(this, LinearLayoutManager.VERTICAL ,false)
        camionList= arrayListOf()
        recyclerView.adapter = AdaptadorCamiones(camionList)



        db=FirebaseFirestore.getInstance()
        db.collection("Camiones")
            .get()
            .addOnSuccessListener {
                if(!it.isEmpty){
                    for (data in it.documents){
                        val camion: datos? =data.toObject(datos::class.java)
                        if (camion !=null){
                            camionList.add(camion)
                        }

                    }

                }

            }

            .addOnFailureListener{
                Toast.makeText(this, it.toString(), Toast.LENGTH_SHORT).show()
            }
    }

}```

  [1]: https://i.stack.imgur.com/6xmfX.png