recycleview中的数据不正确

Question

我在android studio中使用RecycleView。当数据来自Firebase时，它首先是正确的。后来，当我向list()类型的列表添加1个sms时，我得到了错误的数据。例如:如果List为{1,2,3,4,5}，将6添加到屏幕上的列表中List{1,2,3,4,5,6}的元素应该按这个顺序出现。在这种情况下，追逐之后List{1,2,3,4,5,1,2,3,4,5,6}是这样的。1次更新后，它工作良好。

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)
}
}

Answer 1

在适配器中创建这个方法:

fun updateList(list: List<Sms>){
this.list.clear()
this.list.addAll(list)
notifyDataSetChanged()
}

然后在你的observer方法中调用它，它应该可以解决你的问题。

Answer 2

Xato Firebase'dan getAllSms da, sendSms() usuli ishlayotganda， {1,2,3,4,5,1,2,3,4,5,6} 0 ' xat sifatida qaytariladi。结果。在data change - data列表中调用。Clear ni bajarishingiz kerak.

override fun getAllSms(result: (UiState<ArrayList<Sms>>) -> Unit) {
CoroutineScope(Dispatchers.IO).launch {
val list = ArrayList<Sms>()
myRef.getReference("global")
.addValueEventListener(object :ValueEventListener{
override fun onDataChange(snapshot: DataSnapshot) {
list.clear()
snapshot.children.forEach {
val sms:Sms=it.getValue(Sms::class.java)!!
list.add(sms)
}
list.forEach {
Log.d("LLIISSTT", it.smsText)
}
result.invoke(UiState.Success(list))
}
override fun onCancelled(error: DatabaseError) {
result.invoke(UiState.Failure(error.message))
}
})
}
}