class FeedRecyclerAdapter (private val postList : ArrayList<Post>) : RecyclerView.Adapter<FeedRecyclerAdapter.PostHolder>() {

class PostHolder(val binding: FragmentDataBinding) : RecyclerView.ViewHolder(binding.root)

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PostHolder {
        val binding = FragmentDataBinding.inflate(LayoutInflater.from(parent.context),parent,false)
        return PostHolder(binding)
}

override fun onBindViewHolder(holder: PostHolder, position: Int) {

    holder.binding.verimText.text = postList.get(position).lsi

}

override fun getItemCount(): Int {
        return postList.size
}

Here are the codes written for recyclerView.

private lateinit var postArrayList : ArrayList<Post>



override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    auth = Firebase.auth
    firestore = Firebase.firestore

    postArrayList = ArrayList<Post>()

    getData()

}



override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View {
    _binding = FragmentDataBinding.inflate(inflater, container, false)
    val view = binding.root
    val recyclerView = view.findViewById(R.id.recyclerView) as RecyclerView
    recyclerView.layoutManager = LinearLayoutManager(activity)
    recyclerView.adapter = FeedRecyclerAdapter(postArrayList)
    return view

}

private fun getData(){
    firestore.collection("Posts").addSnapshotListener { value, error ->

        if (error!=null){
            Toast.makeText(requireContext(),error.localizedMessage,Toast.LENGTH_SHORT).show()
        }else{
            if (value !=null){
                if (!value.isEmpty){
                    val documents = value.documents
                    for (document in documents){
                        val araziBoyutu = document.get("Arazi Boyutu") as String
                        val araziEgimi = document.get("Arazi Eğimi") as String
                        val panelBoyutu = document.get("Panel Boyutu") as String
                        val panelSayisi = document.get("Panel Sayisi") as String
                        val sehir = document.get("Şehir") as String


                        val post = Post(panelSayisi,panelBoyutu,araziEgimi,araziBoyutu,sehir)
                        postArrayList.add(post)
                    }
                }
            }
        }
    }
}

The codes here are the part where I define the RecylcerView and save the information.

I can pull the data, I can see it on firebase, when I print it with println, I can read it in the console, I can go to the page where the text should be written, but I can't see this data in the verimText TextView I'm trying to print.

CodePudding user response：

Try to call notifyDataSetChanged() or notifyItemRangeInserted() after adding post.

CodePudding user response：

Recyclerview should be declared inside onViewCreated Method

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
            super.onViewCreated(view, savedInstanceState)
       val recyclerView = view.findViewById(R.id.recyclerView) as RecyclerView
       recyclerView.layoutManager = LinearLayoutManager(activity)
       recyclerView.adapter = FeedRecyclerAdapter(postArrayList)
    }

CodePudding user response：

move this line

recyclerView.adapter = FeedRecyclerAdapter(postArrayList)

to

val post = Post(panelSayisi,panelBoyutu,araziEgimi,araziBoyutu,sehir)
postArrayList.add(post)
recyclerView.adapter = FeedRecyclerAdapter(postArrayList)//move to here