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在此處輸入影像描述
它只顯示陣列中的最后一個條目我想顯示每個條目
配接器代碼
package com.example.caterers_app
class CommentAdapter(private val commentlist : ArrayList<CommentDataClass>) : RecyclerView.Adapter<CommentAdapter.MyViewHolder>() {
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): CommentAdapter.MyViewHolder {
val itemView = LayoutInflater.from(parent.context).inflate(R.layout.commentstemplate,
parent,false)
return MyViewHolder(itemView) }
override fun getItemCount(): Int {
Log.d("size", commentlist.size.toString())
return commentlist.size
}
class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val comment : TextView = itemView.findViewById(R.id.comment)
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
val comments = commentlist[position]
comments.list?.forEach {
holder.comment.text = it.toString()
}
//holder.comment.text = comments.list.toString()
}
}
如果我使用 holder.comment.text = comments.list.toString() 它將在單個 recyclerview 塊中顯示所有陣列項
資料類
package com.example.caterers_app
data class CommentDataClass(val list : List<String>? = null)
{
}
分段
package com.example.caterers_app
class Comments(val doc : String) : Fragment() {
private lateinit var docid : String
private lateinit var recyclerView: RecyclerView
private lateinit var commentarraylist : ArrayList<CommentDataClass>
private lateinit var adapter: CommentAdapter
private lateinit var db : FirebaseFirestore
init {
docid = doc
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.fragment_comments, container, false)
recyclerView = view.findViewById(R.id.comentoo)
recyclerView.layoutManager = LinearLayoutManager(context)
recyclerView.setHasFixedSize(true)
commentarraylist = arrayListOf()
adapter = CommentAdapter(commentarraylist)
recyclerView.adapter = adapter
EventChangeListner()
return view
}
companion object {
fun newInstance(): Comments {
return Comments("null")
}
}
private fun EventChangeListner() {
var obj = CommentDataClass()
db = FirebaseFirestore.getInstance()
db.collection("User_Events")
.addSnapshotListener(object : EventListener<QuerySnapshot> {
override fun onEvent(value: QuerySnapshot?, error: FirebaseFirestoreException?) {
if(error!= null) {
return
}
for (dc : DocumentChange in value?.documentChanges!!){
if(dc.type == DocumentChange.Type.ADDED){
//eventarraylist.add(dc.document.toObject(EventsData::class.java))
if(dc.document.id.toString() == docid.toString()){
obj = dc.document.toObject(CommentDataClass::class.java)
commentarraylist.add(obj)
}
}
}
adapter.notifyDataSetChanged()
}
})
}
}
我想在單獨的 recyclerview 專案中顯示每個陣列專案我如何使用 firebase firestore 在 kotlin 中做到這一點
uj5u.com熱心網友回復：
ArrayList<CommentDataClass>當您可能想要傳遞時，您正在將 a 傳遞給配接器List<String>，因為CommentDataClass包含List<String>?
您可能希望進行CommentAdapter.commentlist修改：
class CommentAdapter() : RecyclerView.Adapter<CommentAdapter.MyViewHolder>() {
var commentlist = emptyList<String>()
...
}
一旦你有你的覆寫它CommentDataClass：
if(dc.document.id.toString() == docid.toString()){
obj = dc.document.toObject(CommentDataClass::class.java)
adapter.commentlist = obj.list
}
轉載請註明出處，本文鏈接：https://www.uj5u.com/net/507507.html
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