当条件应用于适配器中的回收器视图项目时，不会在卡片视图中显示数据

Question

我用firebase实时数据库制作了一个recyclerview，并在适配器类中应用了一些条件，应用条件工作，但recyclerview项目没有在卡片视图中显示数据，它只显示cardview，但在搜索视图中它正确显示cardview的数据;我已经添加了截图，请解决我的问题

package com.bookqueen.bookqueen.adapters
class bookadapter(
private var booklist: ArrayList<Booksmodel>,
private val itemClickListener: OnBookItemClicklistner
) : RecyclerView.Adapter<bookadapter.bookholder>() {
var searchText: String = ""

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): bookholder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.singlebook, parent, false)
return bookholder(view)
}
@SuppressLint("NotifyDataSetChanged")
fun filterlist(filterlist: ArrayList<Booksmodel>, searchText: String) {
booklist = filterlist
this.searchText = searchText
notifyDataSetChanged()
}
override fun onBindViewHolder(holder: bookholder, position: Int) {
val view = booklist[position]
holder.bind(view, itemClickListener)

}
override fun getItemCount(): Int {
return booklist.size
}
inner class bookholder(view: View) : RecyclerView.ViewHolder(view) {
val bookname: TextView = view.findViewById(R.id.recbooknametxt)
val bookpublication = view.findViewById<TextView>(R.id.recbookpubtxt)
val bookdept = view.findViewById<TextView>(R.id.recbookdepttxt)
val bookimage = view.findViewById<ImageView>(R.id.recbookimg)

fun bind(book: Booksmodel, clicklistner: OnBookItemClicklistner) {
val database = FirebaseDatabase.getInstance()
val auth = FirebaseAuth.getInstance()
database.getReference("Users").child(book.UserUID.toString())
.addListenerForSingleValueEvent(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
if (snapshot.value != null) {
val usercollege = snapshot.child("College").value.toString()
database.getReference("Users")
.child(auth.currentUser!!.uid)
.addListenerForSingleValueEvent(object :
ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
if (snapshot.value != null) {
val mycollege =
snapshot.child("College").value.toString()
if (usercollege == mycollege) {
searchitem(book)
} else {
booklist.remove(book)
}
}
}
override fun onCancelled(error: DatabaseError) {
}
})
}
}
override fun onCancelled(error: DatabaseError) {
}
})
itemView.setOnClickListener {
clicklistner.onBookItemclick(book)
}
}

fun searchitem(book: Booksmodel) {
if (searchText.isNotBlank()) {
val highlightedText = book.BookName!!.replace(
searchText,
"<font color='red'>$searchText</font>",
true
)
bookname.text =
HtmlCompat.fromHtml(
highlightedText,
HtmlCompat.FROM_HTML_MODE_LEGACY
)
} else {
bookname.text = book.BookName
}
//bookname.text=book.BookName
bookpublication.text = book.BookPublication
bookdept.text = book.Department
Picasso.get().load(book.BookImage).into(bookimage)
}
}
interface OnBookItemClicklistner {
fun onBookItemclick(books: Booksmodel)
}
}

Screenshoot联系

Answer 1

add notifydatasetchanged after booklist.remove(book)