我在android studio中使用RecycleView。当数据来自Firebase时，最初是正确的。后来，当我向List（）类型的列表添加1条短信时，我得到了错误的数据。例如：如果列表是{1，2，3，4，5}，在屏幕上的列表中添加6。列表{1，2，3，4，5，6}的元素应该按照这个顺序出现。在这种情况下，追赶后列表{1，2，3，4，5，1，2，3，4，5，6}是这样的。经过1次更新后，它工作正常。

class ChatAdapter(var list:MutableList<Sms>,var context: Context):RecyclerView.Adapter<RecyclerView.ViewHolder>(){
    companion object {
        private const val ITEM_RECEIVE = 1
        private const val ITEM_SENT = 2
    }

    private val shared by lazy {
        SharedPref(context)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        return if (viewType == 1) {
            val view = LayoutInflater.from(context).inflate(R.layout.item_he_sms, parent, false)
            ReceiveVewHolder(view)
        }else{
            val view = LayoutInflater.from(context).inflate(R.layout.item_my_sms, parent, false)
            SentViewHolder(view)
        }
    }

    override fun getItemViewType(position: Int): Int {
        val currentMessage = list[position]
        return if (currentMessage.emailAddress==shared.getEmail()){
            ITEM_SENT
        }else{
            ITEM_RECEIVE
        }
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        if (shared.getEmail()==list[position].emailAddress){
            holder as SentViewHolder
            holder.textView.text = list[position].smsText
        }else{
            holder as ReceiveVewHolder
            holder.textView.text = list[position].smsText
            if (list[position].gender=="Male"){
                holder.imagePerson.setImageResource(R.drawable.male_avatar)
            }else{
                holder.imagePerson.setImageResource(R.drawable.female_avatar)
            }
        }
    }

    override fun getItemCount(): Int =list.size

    inner class SentViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val textView: TextView = view.findViewById(R.id.my_message)
    }

    inner class ReceiveVewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val textView: TextView = view.findViewById(R.id.he_message)
        val imagePerson:CircleImageView=view.findViewById(R.id.imagePerson)
    }
}