Recycler View items Not showing from firebase realtime database in kotlin - firebase

Question

I am trying to show this datas to my recycler view but they are not showed in the recycler view.
My Codes are below
fragment_group_notice.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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:id="#+id/GroupNoticeFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".groupTab.groupNotices.GroupNoticesFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/groupNoticeListRecycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager">
</androidx.recyclerview.widget.RecyclerView>
</FrameLayout>
card_group_notice.xml
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:background="#color/primary_green"
android:orientation="horizontal"
android:padding="10dp">
<TextView
android:id="#+id/NoticeNameCard"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Notice Name"
android:textColor="#color/pure_white"
android:textSize="25sp" />
</LinearLayout>
</layout>
GroupNoticesFragment
class GroupNoticesFragment : Fragment() {
private var _binding: FragmentGroupNoticesBinding? = null
private val binding get() = _binding!!
private lateinit var recycler: RecyclerView
private var adapter: NoticeAdapter?= null
private lateinit var viewModel: NoticeViewModel
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
container?.removeAllViews()
_binding = FragmentGroupNoticesBinding.inflate(inflater, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
recycler = binding.groupNoticeListRecycler
recycler.layoutManager = LinearLayoutManager(context)
recycler.setHasFixedSize(true)
adapter = NoticeAdapter()
recycler.adapter = adapter
viewModel = ViewModelProvider(this)[NoticeViewModel::class.java]
viewModel.allNotices.observe(viewLifecycleOwner) {
adapter!!.updateNoticeList(it)
}
}
}
NoticeAdapter.kt
class NoticeAdapter : RecyclerView.Adapter<NoticeAdapter.NoticeViewHolder>() {
private val notices = ArrayList<GroupNoticeData>()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): NoticeViewHolder {
val itemView = LayoutInflater.from(parent.context).inflate(
R.layout.card_group_notices,
parent, false
)
return NoticeViewHolder(itemView)
}
override fun onBindViewHolder(holder: NoticeViewHolder, position: Int) {
val currentNotice = notices[position]
holder.noticeName.text = currentNotice.taskName
}
override fun getItemCount(): Int {
return notices.size
}
fun updateNoticeList(notice: List<GroupNoticeData>) {
this.notices.clear()
this.notices.addAll(notice)
notifyDataSetChanged()
}
class NoticeViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val noticeName: TextView = itemView.findViewById(R.id.NoticeNameCard)
}
}
GroupNoticeData
data class GroupNoticeData(
val userId: String,
val taskName: String,
val taskDescription: String,
val taskDate: String,
val path: String?,
val groupId: String
) {
fun toMap(): Map<String, Any?> {
return mapOf(
"userId" to userId,
"taskName" to taskName,
"taskDescription" to taskDescription,
"taskDate" to taskDate,
"path" to path,
"groupId" to groupId
)
}
}
NoticeViewModel
class NoticeViewModel : ViewModel() {
private val repository : NoticeRepo = NoticeRepo().getInstance()
private val _allNotices = MutableLiveData<List<GroupNoticeData>>()
val allNotices : LiveData<List<GroupNoticeData>> = _allNotices
init {
repository.loadNotices(_allNotices)
}
}
NoticeRepo
class NoticeRepo{
val auth = Firebase.auth
val user = auth.currentUser!!.uid
private val noticeReference : DatabaseReference = FirebaseDatabase.getInstance().getReference("groupNotice").child(user)
#Volatile private var INSTANCE : NoticeRepo?= null
fun getInstance(): NoticeRepo {
return INSTANCE ?: synchronized(this) {
val instance = NoticeRepo()
INSTANCE = instance
instance
}
}
fun loadNotices(allNoticeList: MutableLiveData<List<GroupNoticeData>>) {
noticeReference.addValueEventListener(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
try {
val noticeList : List<GroupNoticeData> = snapshot.children.map { dataSnapshot ->
dataSnapshot.getValue(GroupNoticeData::class.java)!!
}
allNoticeList.postValue(noticeList)
}catch (_: Exception){
}
}
override fun onCancelled(error: DatabaseError) {
TODO("Not yet implemented")
}
})
}
}
I tried to change the reference in repo class aslo checked the items height width issue but couldn't come to any solution
There isn't any error but the code is supposed to load data from the rtdb reference but it isn't showing anything. The recycler view was supposed to fill up using the card_group_notice.xml where the information were supposed to come from the database child as you can see groupNotice/(userId)