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Android Kotlin expanding textview in adapter causes unwanted expanding another textviews

I show a list of items using adapter and recyclerview. Each item shows only 4 lines of biography-textView. In order to see whole biography, user clicks 'expand' textView. My code functions but there is a problem because sometimes (somehow randomly) one 'expand' click (f.e. in item No 1) causes expanding 2-3 biography textView more in another items(f.e. items No 7 and 12). What is wrong with my code? How to check it/identify why items textView are extra expand?
Can anyone help?
class ShowMastersAdapter (
private val masterList: ArrayList<Master>,
private val itemListener: OnItemClickListener
) : RecyclerView.Adapter<ShowMastersAdapter.ShowMasterViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ShowMasterViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.item_master, parent, false)
return ShowMasterViewHolder(view)
}
override fun onBindViewHolder(holder: ShowMasterViewHolder, position: Int) {
holder.bindData(position)
}
override fun getItemCount(): Int {
return masterList.size
}
inner class ShowMasterViewHolder(view: View) : RecyclerView.ViewHolder(view) {
fun bindData(position: Int) {
val masterBiography = itemView.findViewById<TextView>(R.id.item_master_biography)
val masterExpandBiography =itemView.findViewById<TextView>(R.id.item_master_expand_text)
masterBiography.text = masterList[position].biography
masterExpandBiography.setOnClickListener {
itemListener.onReadMoreTextClick(masterExpandBiography, masterBiography)
}
}
}
interface OnItemClickListener {
fun onReadMoreTextClick(expandText: TextView, biographyText: TextView)
}
}
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/layout_top_part">
<TextView
android:id="#+id/item_master_biography"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/item_master_margin_start"
android:layout_marginEnd="#dimen/item_master_margin_end"
android:ellipsize="end"
android:maxLines="4"
android:text="unknown"
android:textSize="#dimen/font_main_size_item_master"
app:layout_constraintBottom_toTopOf="#+id/item_master_expand_text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/item_master_biography_label" />
<TextView
android:id="#+id/item_master_expand_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:text="#string/it_master_expand_text"
android:textColor="#color/text_as_link"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
class FragmentShowMasters() : Fragment(), ShowMastersAdapter.OnItemClickListener{
private var listOfMasters: ArrayList<Master> = ArrayList()
private lateinit var myRecycler: RecyclerView
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,savedInstanceState:Bundle?): View {
myView = inflater.inflate(R.layout.fragment_show_masters, container, false)
myRecycler = myView.findViewById(R.id.recycler_show_masters)
myRecycler.setHasFixedSize(true)
myRecycler.adapter = ShowMastersAdapter(listOfMasters, this, highlightSearchText)
myRecycler.adapter?.notifyDataSetChanged()
myRecycler.layoutManager = LinearLayoutManager(this.context)
return myView
}
override fun onReadMoreTextClick(expandText: TextView, biographyText: TextView) {
if (biographyText.maxLines == 4) {
biographyText.maxLines = Int.MAX_VALUE
expandText.text = getString(R.string.it_master_shrink_text)
} else {
biographyText.maxLines = 4
expandText.text = getString(R.string.it_master_expand_text)
}
}
}

How to display JSON data from Horizontal recycle view kotlin using MVP method

I hope is all well with you.
I have constructed my code and build according the MVP style as well pulling JSON data but when I run the the code the horizontal recycle view and the JSON data is not being displayed. I tried going through every line of code and watching other tutorials but still no results.
Here is below my main activity:
class ProductCategoryActivity : BaseMvpActivity<ProductCategoryActivityView, ProductCategoryActivityPresnter> (),
ProductCategoryActivityView, CategoryAdapter.onItemClickListener{
private lateinit var binding: FragmentProductCategoryBinding
val data :MutableList<CateogryResponse> = ArrayList()
val adapter= CategoryAdapter(data, this)
#Inject
lateinit var presenter: ProductCategoryActivityPresnter
#Inject
lateinit var progressDialog: ProgressDialog
override fun onCreateComponent() {
userComponent.plus(CategoryActivityModule(this)).inject(this)
}
override fun providePresenter(): ProductCategoryActivityPresnter {
return presenter
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = FragmentProductCategoryBinding.inflate(layoutInflater)
val view = binding.root
setContentView(view)
presenter.fetchcatogries()
showdata(ArrayList())
}
override fun showError(message: String) {
}
override fun showProgress() {
}
override fun hideProgress() {
}
override fun showdata(data: ArrayList<CateogryResponse>) {
val layoutManager = LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false)
recyclerViewPrimary.layoutManager = layoutManager
recyclerViewPrimary.setHasFixedSize(true)
recyclerViewPrimary.adapter = adapter
for(i in data)
data.add(CateogryResponse("product"))
}
override fun onItemClick(position: Int) {
Toast.makeText(this, "Item $position clicked", Toast.LENGTH_SHORT).show()
val clickedItem = data[position]
adapter.notifyItemChanged(position)
}
}
Here is my presenter:
#ActivityScope
class ProductCategoryActivityPresnter #Inject constructor(
private val stringProvider: StringProvider,
#AndroidScheduler private val observeOnScheduler: Scheduler,
#IOScheduler private val subscribeOnScheduler: Scheduler,
private val getCategoryUseCase: CategoryUseCase
) : BasePresenter<ProductCategoryActivityView>() {
lateinit var catogriesservice: CategoryRepositoryImpl
val catogriesLoadError = MutableLiveData<Boolean>()
val loading = MutableLiveData<Boolean>()
var catogries: ArrayList<CateogryResponse> = arrayListOf()
override fun onCreatePresenter(savedInstanceState: Bundle?) {
}
override fun onSaveInstanceState(outState: Bundle?) {
}
override fun onLoadData(arguments: Bundle?) {
fetchcatogries()
}
fun fetchcatogries() {
getCategoryUseCase.execute()
.observeOn(observeOnScheduler)
.subscribeOn(subscribeOnScheduler)
.subscribe(
SingleRequestSubscriber(
{
it
if (it != null && it.size > 0) {
catogries.removeAll(catogries)
catogries.addAll(it)
}
},
onFailure = { appException ->
view?.showError(
ErrorHandler.getErrorMessage(
appException,
stringProvider
)
)
},
onApiError = { apiException ->
view?.showError(
ErrorHandler.getErrorMessage(
apiException,
stringProvider
)
)
},
onAuthenticationError = { requestxception ->
view?.showError(
ErrorHandler.getErrorMessage(
requestxception,
stringProvider
)
)
},
onShowProgress = {
if (it) {
view?.showProgress()
} else {
view?.hideProgress()
}
},
onSubscribed = {
disposable.add(it)
})
)
}
}
Here is my view:
interface ProductCategoryActivityView {
fun showError(message: String)
fun showProgress()
fun hideProgress()
fun showdata ( data: ArrayList<CateogryResponse>)
}
Here is my adapter:
class CategoryAdapter(
private val data: List<CateogryResponse>,
private val listener: onItemClickListener
) : RecyclerView.Adapter<CategoryAdapter.ViewHolder>() {
private val items: MutableList<CardView>
init {
this.items = ArrayList()
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val v = LayoutInflater.from(parent.context)
.inflate(R.layout.fragment_category_adapter, parent, false)
return ViewHolder(v)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.tvTitle.text = data[position].product
items.add(holder.card)
}
override fun getItemCount(): Int {
return data.size
}
inner class ViewHolder(itemView: View
) : RecyclerView.ViewHolder(itemView),
View.OnClickListener {
val tvTitle: TextView = itemView.featured_title
val card: CardView = itemView.CardView
init {
itemView.setOnClickListener(this)
}
override fun onClick(v: View?) {
val position: Int = adapterPosition
if (position != RecyclerView.NO_POSITION) {
listener.onItemClick(position)
}
}
}
interface onItemClickListener {
fun onItemClick(position: Int)
}
}
Image:
Fragment Category Adapter:
android:id="#+id/CardView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
app:cardCornerRadius="2dp"
app:cardElevation="8dp">
<!-- We Will Add here the card & ImageViews -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="15dp">
<ImageView
android:id="#+id/featured_image"
android:layout_width="match_parent"
android:layout_height="140dp"
android:scaleType="centerCrop" />
<TextView
android:id="#+id/featured_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:lineHeight="23dp"
android:text="Chairs"
android:textColor="#color/colorAccent"
android:textSize="20sp" />
<TextView
android:id="#+id/featured_desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="asbkd asudhlasn saudnas jasdjasl hisajdl asjdlnas" />
</LinearLayout>
</androidx.cardview.widget.CardView>
Fragment Product Category:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:background="#fafcfe"
tools:context="ui.category.ProductCategoryActivity">
<ImageView
android:id="#+id/imageView3"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
/>
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraintLayout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="48dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="#+id/imageView"
app:layout_constraintTop_toTopOf="parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerViewPrimary"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="48dp"
android:layout_marginTop="20dp"
android:text="#string/topselling"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/constraintLayout" />
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraintLayout2"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="32dp"
android:layout_marginLeft="32dp"
android:layout_marginTop="16dp"
app:layout_constraintBottom_toTopOf="#+id/imageView3"
app:layout_constraintEnd_toEndOf="#+id/constraintLayout"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerViewSecondary"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
<ImageView
android:id="#+id/imageView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="32dp"
app:layout_constraintBottom_toBottomOf="#+id/imageView3"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
/>
<TextView
android:id="#+id/textViewCategories"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="48dp"
android:layout_marginTop="20dp"
android:layout_marginBottom="15dp"
android:text="#string/catogries"
android:textSize="18sp"
app:layout_constraintBottom_toTopOf="#+id/constraintLayout"
app:layout_constraintStart_toStartOf="parent"
tools:layout_editor_absoluteX="39dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
Not sure what went wrong.
If someone can point it out or show me what needs to be done to be able to display the data in horzintal recycle view, I would be really thanlful

You should update your recycler view adapter once your fetch call is executed, not before it ends.
Modify your fetchcatogries declaration so it accepts a callback method, which will be executed after the data are loaded.
This method will accept a list object as a parameter, which you will manage in your ProductCategoryActivity to populate the RecyclerView.
fun fetchcatogries(callback: (MutableList<CateogryResponse>) -> Unit) {
getCategoryUseCase.execute()
.observeOn(observeOnScheduler)
.subscribeOn(subscribeOnScheduler)
.subscribe(
SingleRequestSubscriber(
{ categories ->
callback(categories)
},
...
)
}
You can now edit your onCreate and showdata methods in ProductCategoryActivity like this:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = FragmentProductCategoryBinding.inflate(layoutInflater)
val view = binding.root
setContentView(view)
presenter.fetchcatogries { categories ->
showdata(categories as ArrayList<CateogryResponse>)
}
}
override fun showdata(data: ArrayList<CateogryResponse>) {
val layoutManager = LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false)
recyclerViewPrimary.layoutManager = layoutManager
recyclerViewPrimary.setHasFixedSize(true)
recyclerViewPrimary.adapter = CategoryAdapter(data.toList(), this)
}

Trying to display an entire collection from my Firestore database using RecyclerView and Fragments - Kotlin

I have tried many different tutorials and haven't been able to relate any to my application. My application in a gist displays a user's medication that they are taking. Here is my data class...
import java.util.HashMap
class LocalMedication {
var m_medicationName: String? = null
var m_medicationQty: String? = null
var m_medicationType: String? = null
var m_medicationExpDate: String? = null
var m_medicationStatus: Boolean = false
constructor() {}
constructor(medicationName: String, medicationQty: String, medicationType: String, medicationExpDat : String, medicationStatus : Boolean) {
this.m_medicationName = medicationName
this.m_medicationType = medicationType
this.m_medicationQty = medicationQty
this.m_medicationExpDate = medicationExpDat
this.m_medicationStatus = medicationStatus
}
fun toMap(): Map<String, Any> {
val result = HashMap<String, Any>()
result.put("medicationName", m_medicationName!!)
result.put("medicationType", m_medicationType!!)
result.put("medicationQty", m_medicationQty!!)
result.put("medicationExpDate", m_medicationExpDate!!)
result.put("medicationStatus", m_medicationStatus!!)
return result
}
}
Here is my view holder class
package com.example.home_med.viewHolder
import android.view.View
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.example.home_med.R
class medicationViewHolder(view: View) : RecyclerView.ViewHolder(view) {
var medicationName: TextView
var medicationType: TextView
var medicationQty: TextView
init {
medicationName = view.findViewById(R.id.rv_medicationName)
medicationType = view.findViewById(R.id.rv_medicationType)
medicationQty = view.findViewById(R.id.rv_medicationQty)
}
}
Here is my fragment
class LocalMedication : Fragment() {
private var adapter: FirestoreRecyclerAdapter<LocalMedication, medicationViewHolder>? = null
private var firestoreDB: FirebaseFirestore? = null
private var firestoreListener: ListenerRegistration? = null
private var medList = mutableListOf<LocalMedication>()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
//setContentView(R.layout.activity_main)
firestoreDB = FirebaseFirestore.getInstance()
val recyclerView = recyclerview as? RecyclerView
val mLayoutManager = LinearLayoutManager(context)
recyclerView?.layoutManager = mLayoutManager
recyclerView?.itemAnimator = DefaultItemAnimator()
loadMedication()
firestoreListener = firestoreDB!!.collection("notes")
.addSnapshotListener(EventListener { documentSnapshots, e ->
if (e != null) {
Log.e(TAG, "Listen failed!", e)
return#EventListener
}
medList = mutableListOf()
if (documentSnapshots != null) {
for (doc in documentSnapshots) {
val note = doc.toObject(LocalMedication::class.java)
note.m_medicationName = doc.id
medList.add(note)
}
}
adapter!!.notifyDataSetChanged()
recyclerView?.adapter = adapter
})
}
override fun onDestroy() {
super.onDestroy()
firestoreListener!!.remove()
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val binding: FragmentLocalMedicationBinding = DataBindingUtil.inflate(inflater, R.layout.fragment_local_medication, container, false)
binding.viewMedicationButton.setOnClickListener { v: View ->
v.findNavController().navigate(LocalMedicationDirections.actionLocalMedicationToViewMedication())
}
binding.addMedicationButton.setOnClickListener { v: View ->
v.findNavController().navigate(LocalMedicationDirections.actionLocalMedicationToAddMedication())
}
binding.homeButton.setOnClickListener { v: View ->
v.findNavController().navigate(LocalMedicationDirections.actionLocalMedicationToHome2())
}
setHasOptionsMenu(true)
return binding.root
}
private fun loadMedication() {
val query = firestoreDB!!.collection("notes")
val response = FirestoreRecyclerOptions.Builder<LocalMedication>()
.setQuery(query, LocalMedication::class.java)
.build()
adapter = object : FirestoreRecyclerAdapter<LocalMedication, medicationViewHolder>(response) {
override fun onBindViewHolder(holder: medicationViewHolder, position: Int, model: LocalMedication) {
val note = medList[position]
holder.medicationName.text = note.m_medicationName
holder.medicationType.text = note.m_medicationType
holder.medicationQty.text = note.m_medicationQty
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): medicationViewHolder {
val view = LayoutInflater.from(parent.context)
.inflate(R.layout.recyclerview_item, parent, false)
return medicationViewHolder(view)
}
override fun onError(e: FirebaseFirestoreException) {
Log.e("error", e!!.message)
}
}
adapter!!.notifyDataSetChanged()
recyclerview?.adapter = adapter
}
public override fun onStart() {
super.onStart()
adapter!!.startListening()
}
public override fun onStop() {
super.onStop()
adapter!!.stopListening()
}
}
Here is my recyclerViewItem XML file
<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:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/rv_medicationName"
style="#style/word_title"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:background="#android:color/holo_orange_light"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/rv_medicationQty"
style="#style/word_title"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:background="#android:color/holo_orange_light"
app:layout_constraintStart_toEndOf="#+id/rv_medicationName"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/rv_medicationType"
style="#style/word_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:background="#android:color/holo_orange_light"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/rv_medicationQty"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
Here is my localMedications XML file
<layout 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"
tools:context=".LocalMedication">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="32dp"
android:layout_marginBottom="32dp"
android:text="LOCAL MEDICATION"
android:textSize="36sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.478"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerview"
android:layout_width="543dp"
android:layout_height="0dp"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:background="#android:color/darker_gray"
app:layout_constraintBottom_toTopOf="#+id/homeButton"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView"
tools:listitem="#layout/recyclerview_item" />
<Button
android:id="#+id/viewMedicationButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="100dp"
android:layout_marginBottom="100dp"
android:text="View Med"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
<Button
android:id="#+id/addMedicationButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="100dp"
android:layout_marginBottom="100dp"
android:text="Add Medication"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<Button
android:id="#+id/homeButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="30dp"
android:layout_marginTop="59dp"
android:layout_marginEnd="30dp"
android:layout_marginBottom="103dp"
android:text="Home"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="#+id/viewMedicationButton"
app:layout_constraintStart_toEndOf="#+id/addMedicationButton"
app:layout_constraintTop_toBottomOf="#+id/addMedicationButton"
app:layout_constraintVertical_bias="0.972" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
Here is what my database looks like...
Datatbase
Any help or guidance would be great. It runs the application, but in the Logs, it says "RecyclerView: No adapter attached; skipping layout"

The problem in your code lies in the fact that the names of the fields in your LocalMedication class are different than the name of the properties in your database. You have in your LocalMedication class a field named m_medicationName while in your database I see it as medicationName and this is not correct. The names must match. Behind the scene, Kotlin is creating a Java class with a getter named getM_medicationName() so Firebase is looking in the database for a field named m_medicationName and not medicationName.
There are two ways in which you can solve this problem. The first one would be to remove the data in your database and add it again using field names (m_medicationName, m_medicationQty etc) that exist in your LocalMedication class.
If you are not allowed to use the first solution, then the second approach will be to use annotations in front of your public fields. So you should use the PropertyName annotation in front of every field. So in your LocalMedication class, a field should look like this:
#get:PropertyName("medicationName")
#set:PropertyName("medicationName")
public var m_medicationName: String? = null
As explained in my answer from the following post:
I am trying to get the correct reference to my Firebase Database child and set the values in my RecyclerView but I am having some issues
It's for Firebase realtime database but the same rules apply to Cloud Firestore.

Horizontal nested recyclerviews loading weird info in the vertical parent

I've been trying for a week loading items inside some horizontal recyclerviews contained in one vertical recyclerview(parent). Both need to have endless scrolling the horizontal ones to the right and the vertical while descending.
Right now the endless scrolling and the loading works. However, this is not working correctly because the horizontal ones are loading crazy data from the other children (My guess is that I'm creating the presenters inside the ViewHolder and some how data gets mixed up)
Is there any other way of doing this. That could work better and faster than my approach. Also, some this I can notice the vertical loading is not as smooth as I've seen in some other apps.
Any help would be greatly appreciated
class EventCatalogAdapter(private val presenter: EventCatalogPresenter):
RecyclerView.Adapter<EventCatalogAdapter.ViewHolder>() {
override fun getItemCount() = presenter.getCategoryEventCount()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) =
EventCatalogAdapter.ViewHolder(parent.inflate(R.layout.item_event_catalog), viewType)
override fun onBindViewHolder(holder: ViewHolder, position: Int) =
presenter.bind(holder, position)
override fun getItemViewType(position: Int) = presenter.getItemType(position)
class ViewHolder(itemView: View, type: Int): RecyclerView.ViewHolder(itemView),
EventCatalogItemView, EventViewList, OnItemClickListener<Event>,
EndlessScrollListener.DataLoader {
private lateinit var companyId: String
private lateinit var catId: String
private val eventPresenter = EventPresenterImpl(this)
override val titleFormat: String? get() = ""
init {
val layoutManager = HorizontalLinearLayoutManager(itemView.context,
LinearLayoutManager.HORIZONTAL, false)
itemView.rvEvents.layoutManager = layoutManager
itemView.rvEvents.addItemDecoration(HorizontalItemDecorator(itemView.context))
itemView.rvEvents.adapter = EventAdapter(eventPresenter, type, this)
itemView.rvEvents.addOnScrollListener(EndlessScrollListener(layoutManager, this))
}
override fun setTitleVisibility(b: Boolean) {
itemView.tvCategoryTitle.visibility = if(!b) View.GONE else View.VISIBLE
}
override fun setCategoryTitle(title: String) {
itemView.tvCategoryTitle.text = title
}
override fun eventsByCategory(companyId: String, categoryId: String) {
this.companyId = companyId
catId = categoryId
eventPresenter.getEventsByCategories(companyId, categoryId)
}
override fun loadMoreData(totalItems: Int) {
Log.d("LOAD", "Event presenter: $eventPresenter for category: $catId")
eventPresenter.getMoreEventsByCategories(companyId, catId, totalItems)
}
override fun setActiveEvent(event: Event?) {}
override fun showSettings() {}
override fun sendMessage(action: String, bundle: Bundle?) {}
override fun showStatus(status: Int) {}
override fun refresh() {
itemView.rvEvents.adapter.notifyDataSetChanged()
}
override fun showMessageTemplate(code: Int) {}
override fun hideMessageTemplate() {
refresh()
}
override fun onItemClick(item: Event) {
}
}
}
class EventAdapter(private val presenter: EventPresenter,
private val listener: OnItemClickListener<Event>):
RecyclerView.Adapter<EventAdapter.ViewHolderItemView>() {
private var type: Int = EVENT_STANDARD
constructor(presenter: EventPresenter, type: Int, listener: OnItemClickListener<Event>) :
this(presenter, listener) {
this.type = type
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) =
ViewHolderItemView(parent.inflate(type))
override fun onBindViewHolder(holder: ViewHolderItemView, position: Int) =
presenter.bind(holder, position)
override fun getItemCount() = presenter.getCount()
class ViewHolderItemView(itemView: View) : RecyclerView.ViewHolder(itemView), EventItemView {
override fun setEventDate(date: Date?) {
itemView.tvDate.text = Tools.formatDate(itemView.context, date)
}
override fun setName(name: String) {
itemView.tvName.text = name
}
override fun setScannerVisibility(scannerVisibility: Boolean) {
itemView.ibScanner.visibility = if (scannerVisibility) View.VISIBLE else View.INVISIBLE
}
override fun setEventPoster(posterUrl: String, transformation: Transformation?) {
Tools.loadImage(posterUrl, itemView.ivPoster, transformation, R.mipmap.portrait_test)
}
override fun setTotalRegistrants(totalRegistrants: Long) {
itemView.tvQtyRegs.text = totalRegistrants.toString()
}
override fun addScanAction(event: Event) {
itemView.ibScanner.setOnClickListener {
val auth = FirebaseAuth.getInstance()
val prefs = PreferenceHelper.customPrefs(itemView.context, auth.currentUser!!.uid)
prefs.edit().putString(EventInteractorImpl.FIELD_EVENT_ID, event.eventId).apply()
(itemView.context as SettingsActivity).launchScanner()
}
}
override fun addEventAction(event: Event) {
itemView.setOnClickListener {
(itemView.context as SettingsActivity).showRegistrants(event)
}
}
}
}
// Parent items:
<android.support.constraint.ConstraintLayout
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="220dp">
<TextView
android:id="#+id/tvCategoryTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/vertical_spacing"
android:paddingBottom="#dimen/vertical_spacing"
android:layout_marginEnd="#dimen/horizontal_spacing"
android:layout_marginStart="#dimen/horizontal_spacing"
android:textAlignment="center"
android:textSize="18sp"
android:textAllCaps="true"
android:fontFamily="sans-serif-light"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="#string/txt_cat_title" />
<android.support.v7.widget.RecyclerView
android:id="#+id/rvEvents"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="#dimen/vertical_spacing"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/tvCategoryTitle" />
</android.support.constraint.ConstraintLayout>
// Children items
<android.support.constraint.ConstraintLayout
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="110dp"
android:layout_height="match_parent"
android:stateListAnimator="#animator/tile_elevation">
<ImageView
android:id="#+id/ivPoster"
android:layout_width="0dp"
android:layout_height="0dp"
android:contentDescription="#string/txt_event_image"
android:src="#mipmap/portrait_test"
android:scaleType="centerCrop"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/tvName"
style="#style/SubTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:textIsSelectable="false"
android:textAllCaps="true"
app:layout_constraintBottom_toTopOf="#+id/ibRegistrants"
app:layout_constraintStart_toStartOf="#+id/ibRegistrants"
tools:text="Washington D.C. " />
<TextView
android:id="#+id/tvDate"
style="#style/SubTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textIsSelectable="false"
app:layout_constraintBottom_toTopOf="#+id/tvName"
app:layout_constraintStart_toStartOf="#+id/ibRegistrants"
tools:text="03/23" />
<TextView
android:id="#+id/tvQtyRegs"
style="#style/Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:textIsSelectable="false"
app:layout_constraintBottom_toBottomOf="#+id/ibRegistrants"
app:layout_constraintStart_toEndOf="#+id/ibRegistrants"
app:layout_constraintTop_toTopOf="#+id/ibRegistrants"
tools:text="140" />
<ImageView
android:id="#+id/ibRegistrants"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginStart="8dp"
android:contentDescription="#string/txt_registrants"
android:src="#drawable/ic_registrants_48px"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<ImageButton
android:id="#+id/ibScanner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="?attr/selectableItemBackgroundBorderless"
android:contentDescription="#string/txt_registrants"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_scan_action" />
</android.support.constraint.ConstraintLayout>

livedata recyclerview with checkbox

I am implementing android architecture component to view buyers list and select one.
Here is my Buyer entity
#Entity
data class Buyer(#PrimaryKey var id: Long = 0, var name: String = "", var photo: String = "", var address: String = "",
#Ignore var isSelected: Boolean = false,
#SerializedName("last_update_time") var lastUpdateTime: Long = 0L) {
}
I have inserted and displayed it in recyclerview.
What I want is to know how can I display particular buyer is selected, when click on one buyer.
If I click on one buyer previous selected buyer must deselect.
Please help me to implement this.
EDIT
class BuyerAdapter(private var buyers: ArrayList<Buyer>, private val listener: View.OnClickListener) : RecyclerView.Adapter<BuyerViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BuyerViewHolder {
val v = LayoutInflater.from(parent.context).inflate(
R.layout.item_buyer, parent, false)
return BuyerViewHolder(v)
}
override fun onBindViewHolder(holder: BuyerViewHolder, position: Int) {
bindView(holder, position)
}
private fun bindView(holder: BuyerViewHolder, position: Int) {
val buyer = buyers[position]
holder.setName(buyer.name)
holder.setAddress(buyer.address)
holder.loadImage(ServiceHandler.BASE_URL + buyer.photo)
if (buyer.isSelected) {
holder.setCardColor(R.color.waveBlue)
holder.setNameColor(R.color.white)
holder.setAddressColor(R.color.white)
} else {
holder.setCardColor(R.color.white)
holder.setNameColor(R.color.contentGrey)
holder.setAddressColor(R.color.contentGreyDesc)
}
holder.itemView.tag = buyer
holder.itemView.setOnClickListener(listener)
}
override fun getItemCount(): Int = buyers.size
fun refresh(newBuyers: ArrayList<Buyer>) {
this.buyers = newBuyers
notifyDataSetChanged()
}
}
And here is my adapter xml item
<?xml version="1.0" encoding="utf-8"?><!--<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"--><!--xmlns:card_view="http://schemas.android.com/apk/res-auto"--><!--android:layout_width="match_parent"--><!--android:layout_height="191dp"--><!--android:paddingTop="13dp"--><!-->-->
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/buyer_card"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="4dp"
android:clickable="true"
card_view:cardCornerRadius="2dp"
card_view:cardElevation="4dp"
card_view:cardPreventCornerOverlap="true">
<android.support.constraint.ConstraintLayout
android:id="#+id/rlBuyerBack"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="4dp">
​
<de.hdodenhof.circleimageview.CircleImageView
android:id="#+id/ivLogo"
android:layout_width="40dp"
android:layout_height="40dp"
android:scaleType="centerCrop"
android:src="#drawable/placeholder_profile_photo"
card_view:layout_constraintBottom_toBottomOf="parent"
card_view:layout_constraintLeft_toLeftOf="parent"
card_view:layout_constraintTop_toTopOf="parent" />
<in.motiontech.wave.helper.WaveTextView
android:id="#+id/tvName"
style="#style/semiBoldFont"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:text="Name"
android:textColor="#color/contentGrey"
android:textSize="#dimen/tSizeHeader"
card_view:layout_constraintLeft_toRightOf="#+id/ivLogo"
card_view:layout_constraintTop_toTopOf="#+id/ivLogo" />
<in.motiontech.wave.helper.WaveTextView
android:id="#+id/tvAddress"
style="#style/regularFont"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignStart="#id/tvName"
android:layout_below="#+id/tvName"
android:layout_marginLeft="8dp"
android:layout_marginTop="2dp"
android:text="Address"
android:textColor="#color/contentGrey"
android:textSize="#dimen/tSizeDesc"
card_view:layout_constraintLeft_toRightOf="#+id/ivLogo"
card_view:layout_constraintTop_toBottomOf="#+id/tvName" />
</android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
Edit 2
Here how I added data in recyclerview
viewModel.getBuyers().observe(this, Observer<List<Buyer>> {
if (it != null) {
if (it.isEmpty()) {
showProgress()
if (CommonUtils.isInNetwork(this)) {
viewModel.getBuyerList()
} else {
CommonUtils.showNoInternetDialog(this)
}
} else {
hideProgress()
buyerAdapter?.refresh(ArrayList(it))
}
}
})

What I have done is I have updated value of livedata. You can see below code:
fun selectBuyer(buyer: Buyer?) {
if (buyer == null)
return
buyers.value?.filter { it != buyer }?.forEach { it.isSelected = false }
buyers.value?.get(buyers.value!!.indexOf(buyer))?.isSelected = true
newBuyer = buyer
}
I notice there is no need to notifyupdate, as I am using observer pattern