How can I attach an adapter to my fragment? - kotlin

Question

I use Kotlin in SDK 29.
I would like to make a recyclerView in my fragment. When I run the device, it doesn't crash, the fragment appear but not the Recycler View and I have the following error :
E/RecyclerView: No adapter attached; skipping layout
Here is my code :
Adapter
Import :
import android.content.Context
import android.text.format.DateUtils
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.example.givenaskv1.R
import kotlinx.android.synthetic.main.item_post.view.*
Code :
class PostsAdapter (val context: Context, val posts : List<Post>) :
RecyclerView.Adapter<PostsAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val view = LayoutInflater.from(context).inflate(R.layout.item_post, parent, false)
return ViewHolder(view)
}
override fun getItemCount() = posts.size
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.bind(posts[position])
}
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bind(post: Post) {
itemView.tvUsername.text = post.user?.firstName
itemView.tvDescription.text = post.description
Glide.with(context).load(post.imageUrl).into(itemView.ivPost)
itemView.tvRelativeTime.text = DateUtils.getRelativeTimeSpanString(post.creationTimeMs)
}
}
}
Fragment
Import :
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.navigation.Navigation
import com.example.givenaskv1.R
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.OnMapReadyCallback
import com.google.android.material.bottomsheet.BottomSheetDialogFragment
import com.google.firebase.firestore.FirebaseFirestore
import kotlinx.android.synthetic.main.fragment_page_profil.*
Code :
class FragmentPageProfil : BottomSheetDialogFragment(), OnMapReadyCallback {
private lateinit var googleMap: GoogleMap
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
readFireStoreData()
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_page_profil, container, false)
readFireStoreData()
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
btnProfilOption.setOnClickListener {
val action = FragmentPageProfilDirections.actionFragmentPageProfil2ToProfilOption()
Navigation.findNavController(it).navigate(action)
}
retourBtnprofil.setOnClickListener {
val action = FragmentPageProfilDirections.actionFragmentPageProfil2ToNotificationFragment()
Navigation.findNavController(it).navigate(action)
}
btnCalendar.setOnClickListener {
val action = FragmentPageProfilDirections.actionFragmentPageProfil2ToFragmentCalendrier()
Navigation.findNavController(it).navigate(action)
}
mapProfil.onCreate(savedInstanceState)
mapProfil.onResume()
mapProfil.getMapAsync(this)
}
override fun onMapReady(map: GoogleMap?) {
map?.let {
googleMap = it
}
}
fun readFireStoreData() {
val db = FirebaseFirestore.getInstance()
db.collection("users")
.get()
.addOnCompleteListener {
val result: StringBuffer = StringBuffer()
if(it.isSuccessful) {
for(document in it.result!!) {
result.append(document.data.getValue("firstName")).append(" ")
}
nomUtilisateur.setText(result)
}
}
}
}
Fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".Flux.Flux">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvPosts"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
Can you please help me ?
Thank you !

Answer 1

You forgot to add layoutManager and orientation that's it
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvPosts"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
android:orientation="vertical" />
And You can also fix this function as after return the function doesn't call ever
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
readFireStoreData()
return inflater.inflate(R.layout.fragment_page_profil, container, false)
}

Answer 2

E/RecyclerView: No adapter attached; skipping layout error could be happened when adapter has no data.
Move readFireStoreData() function to before return inflater code
like as below.
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
readFireStoreData()
return inflater.inflate(R.layout.fragment_page_profil, container, false)
}