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Kotlin callbacks OnClickListener from Recyclerview for multiple buttons

I'm really confused about how the Kotlin lambdas work, specifically with click listeners. I had something that was working to do a single ViewModel function in my MainFragment but now I want multiple buttons on my adapter that do different things. At first I thought I would just have to pass all the necessary information including IDs for the different buttons to the callback then do a switch statement in my main fragment that does the appropriate ViewModel functions. As soon as I changed my input parameters the adapter no longer accepted my OnClickListener argument.
First I'll show the old OnClickListener that was working.
ItemAdapter
class ItemAdapter(private val context: Context, private val onClickListener: OnClickListener) : ListAdapter<SongWithRatings, ItemAdapter.SongViewHolder>(SongsComparator())
{
lateinit var isVisible: BooleanArray
override fun onCurrentListChanged(
previousList: List<SongWithRatings>,
currentList: List<SongWithRatings>
) {
super.onCurrentListChanged(previousList, currentList)
if(previousList.size != currentList.size) {
isVisible = BooleanArray(itemCount)
isVisible.fill(element = false)
}
}
class SongViewHolder(view: View) : RecyclerView.ViewHolder(view) {
val textView: TextView = view.findViewById(R.id.item_title)
val textViewBpm: TextView = view.findViewById(R.id.bpm)
val lastPlayed: TextView = view.findViewById(R.id.lastPlayed)
//new rating code 11/27/2021
val ratingBar: SeekBar = view.findViewById(R.id.ratingBar)
val ratingLabel: TextView = view.findViewById(R.id.ratingLabel)
val button: Button = view.findViewById(R.id.submitRating)
//expandable view 3/27/2022
val titleView: LinearLayout = view.findViewById(R.id.titleView)
val expand: ConstraintLayout = view.findViewById(R.id.expand)
//fragment launch buttons
val moreButton: Button = view.findViewById(R.id.moreButton)
val rateButton: Button = view.findViewById(R.id.rateButton)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SongViewHolder {
// create a new view
val adapterLayout = LayoutInflater.from(parent.context)
.inflate(R.layout.list_item, parent, false)
return SongViewHolder(adapterLayout)
}
override fun onBindViewHolder(holder: SongViewHolder, position: Int) {
val item = getItem(position)
//temporary code for initial rating
val initialRating = item.recentPerformanceRating()
var newRating = 0
holder.textView.text = item.song.songTitle
holder.textViewBpm.text = context.resources.getString(R.string.BPM,item.song.bpm)
holder.ratingLabel.setBackgroundColor(getStatusColor(item.recentPerformanceRating()))
//holder.imageView.setImageResource(item.imageResourceID)
holder.ratingLabel.text = context.resources.getString(R.string.Rating, initialRating )
holder.lastPlayed.text = item.lastPlayedString()
//rating bar functionality
holder.ratingBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
override fun onProgressChanged(seekBar: SeekBar, rating: Int, fromUser: Boolean) {
holder.ratingLabel.text = context.resources.getString(R.string.Rating, rating)
newRating = rating
}
override fun onStartTrackingTouch(seekBar: SeekBar) {}
override fun onStopTrackingTouch(seekBar: SeekBar) {}
})
//Performance Rating button functionality
holder.button.setOnClickListener{
onClickListener.onClick(item.song.songTitle, newRating)
}
holder.moreButton.setOnClickListener { }
class OnClickListener(val clickListener: (songTitle: String, newRating: Int) -> Unit) {
fun onClick(songTitle: String,newRating: Int) = clickListener(songTitle, newRating)
}
}
From MainFragment
val recyclerView = view.findViewById<RecyclerView>(R.id.recycler_view)
val adapter = ItemAdapter(requireContext(),
ItemAdapter.OnClickListener { songTitle, newRating ->
songViewModel.insertRating( Rating(System.currentTimeMillis(),songTitle,songViewModel.artistName, newRating )) }
)
Like I said, this all worked fine until I tried to use the OnClickListener with a SongsWithRatings parameter.
Am I even close here or do I have to redo my whole interface between the adapter, fragment and ViewModel?

You just have to make use of Interface for the purpose of providing listeners to the Fragment .
Step 1: Create an Interface Class.
interface ItemClickListener{
//You can include the parameters into the functions which you wish to be associated with the button. Suppose I want Title on Click of more Button, then I will pass it as a parameter
fun onButtonClick(val item : SongsWithRating)
fun onMoreButtonClicked(val title : String)
}
Step 2 : Create a listener variable in your adapter and call the functions in the onClick function of the respective buttons
class ItemAdapter(private val context: Context) : ListAdapter<SongWithRatings, ItemAdapter.SongViewHolder>(SongsComparator())
{
var listener : ItemClickListener ?= null
override fun onBindViewHolder(holder: SongViewHolder, position: Int) {
val item = getItem(position)
//Calling buttonClick and passing the function defined in the interface
along with the parameters
holder.button.setOnClickListener{
listener?.onButtonClick(item)
}
//Similarly for morebutton
holder.moreButton.SetOnClickListener{
listener?.onMoreButtonClicked(item.song.songTitle)
}
}
}
Step 3 : Now the final Step : Go to the fragment wherein the recyclerView is implemented
//Extent the Fragment with the Interface and override the methods
class Fragment : Fragment(), ItemClickListener{
//define Adapter and attach the listener
val adapter = ItemAdapter(requireContext()
adapter.listener = this
}
You are good to go

How can i change the visibility of a textview in every element of the recyclerview?

I have an arraylist (called Itemlist) of all recyclerview elements. In each element there are 2 textviews - a german and english word. only one of them is shown (because they overlap). when i click on the element it shows the other language (for example: the german word is set to gone and the english word is visible now).
Now I want a function which sets all english textviews (in every element) to gone and the german to visible. My problem is - i dont know how to reach all elements in this arraylist and check the visibility of the textviews. in my example it resets only the first word.
For better understanding
Here is the code:
fun reset_to_EN() {
ItemList.forEach { test_if_german() }
}
OR
fun reset_to_EN2() {
for (item in ItemList) {
test_if_german()
}
}
Check visibility
fun test_if_german(){
if (text_view_de.visibility == View.VISIBLE) {
text_view_en.visibility = View.VISIBLE
text_view_de.visibility = View.GONE
}
adapter.notifyDataSetChanged()
}
If you can please show me a code example for better understanding.
Thanks to everyone who tries to help.
Or here is the whole code for the adapter and mainActivity if it's needed:
class Adapter(
val c: Context,
private val ArrList: ArrayList<Item>):
RecyclerView.Adapter<Adapter.ViewHolder>()
{
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val inflater = LayoutInflater.from(parent.context).inflate(R.layout.item, parent, false)
return ViewHolder(inflater)
}
override fun getItemCount() = ArrList.size
inner class ViewHolder(v: View) : RecyclerView.ViewHolder(v), View.OnClickListener {
var textViewDe: TextView = v.text_view_de
var textViewEn: TextView = v.text_view_en
private var menueImage: Button
init {
v.setOnClickListener(this)
textViewDe = v.findViewById(R.id.text_view_de)
textViewEn = v.findViewById(R.id.text_view_en)
menueImage = v.findViewById(R.id.menu_button)
menueImage.setOnClickListener { popupMenu(it) }
}
private fun popupMenu(v:View) {
val drop = PopupMenu(c, v)
val position = ArrList[adapterPosition]
drop.inflate(R.menu.drop_menu)
drop.setOnMenuItemClickListener {
when(it.itemId){
R.id.edit_menu->{
val v2 = LayoutInflater.from(c).inflate(R.layout.add_item_layout,null)
val DE = v2.findViewById<EditText>(R.id.editText)
val EN = v2.findViewById<EditText>(R.id.editText2)
AlertDialog.Builder(c)
.setView(v2)
.setPositiveButton("Ok"){
dialog,_->
position.Englisch = DE.text.toString()
position.Deutsch = EN.text.toString()
notifyDataSetChanged()
//Toast.makeText(c,"User Information is Edited",Toast.LENGTH_SHORT).show()
dialog.dismiss()
}
.setNegativeButton("Cancel"){
dialog,_->
dialog.dismiss()
}
.create()
.show()
true
}
R.id.delete_menu-> {
ArrList.removeAt(adapterPosition)
notifyDataSetChanged()
//Toast.makeText(c,"entfernt",Toast.LENGTH_SHORT).show()
true
}
else -> true
}
}
drop.show()
val popup = PopupMenu::class.java.getDeclaredField("mPopup")
popup.isAccessible = true
val menu = popup.get(drop)
menu.javaClass.getDeclaredMethod("setForceShowIcon",Boolean::class.java)
.invoke(menu,true)
}
override fun onClick(p0: View?) {
if (textViewDe.visibility == View.VISIBLE) {
textViewDe.visibility = View.GONE
textViewEn.visibility = View.VISIBLE
} else {
textViewDe.visibility = View.VISIBLE
textViewEn.visibility = View.GONE
}
}
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val currentItem = ArrList[position]
holder.textViewDe.text = currentItem.Deutsch
holder.textViewEn.text = currentItem.Englisch
}
And MainActivity:
class MainActivity : AppCompatActivity() {
//DEFINITION
private lateinit var addButton: FloatingActionButton
private lateinit var ItemList: ArrayList<Item>
private lateinit var recy: RecyclerView
private lateinit var adapter: Adapter
//ONCREATE
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
//FINDVIEWBYID
addButton = findViewById(R.id.addingBtn)
ItemList = ArrayList()
recy = findViewById(R.id.recycler_view)
//RECYCLERVIEW
adapter = Adapter(this, ItemList)
recy.layoutManager = LinearLayoutManager(this)
recy.adapter = adapter
//FUNCTION-CALL
addButton.setOnClickListener { addInfo() }
}
//FUNKTIONENS
private fun addInfo() {
val inflter = LayoutInflater.from(this)
val v = inflter.inflate(R.layout.add_item_layout, null) //
val eng = v.findViewById<EditText>(R.id.editText)
val deu = v.findViewById<EditText>(R.id.editText2)
val addDialog = AlertDialog.Builder(this)
addDialog.setView(v)
addDialog.setPositiveButton("OK"){ dialog, _->
val eng2 = eng.text.toString()
val deu2 = deu.text.toString()
val UUID = UUID.randomUUID()
ItemList.add(Item(UUID, eng2, deu2))
adapter.notifyDataSetChanged()
//Toast.makeText(this, "Adding Success", Toast.LENGTH_SHORT).show()
dialog.dismiss()
}
addDialog.setNegativeButton("Cancel"){ dialog, _->
dialog.dismiss()
}
addDialog.create()
addDialog.show()
}
fun clearData() {
ItemList.clear()
adapter.notifyDataSetChanged()
Toast.makeText(this, "Alles gelöscht", Toast.LENGTH_SHORT).show()
}
fun reset_all_EN() {
//ArrayList = ItemList
val size: Int = ItemList.size
for (i in 0 until size) {
if (text_view_de.visibility == View.VISIBLE) {
text_view_en.visibility = View.VISIBLE
text_view_de.visibility = View.GONE
}
adapter.notifyDataSetChanged()
}
}
fun reset_to_EN() {
// using forEach() method
ItemList.forEach { test_if_german() }
}
fun reset_to_EN2() {
for (item in ItemList) {
test_if_german()
}
}
fun test_if_german(){
if (text_view_de.visibility == View.VISIBLE) {
text_view_en.visibility = View.VISIBLE
text_view_de.visibility = View.GONE
}
adapter.notifyDataSetChanged()
}
//MENU CLASSES
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
menuInflater.inflate(R.menu.menu, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item.itemId) {
R.id.open_menu -> {
val intent = Intent(this, InfoActivity::class.java)
startActivity(intent)
}
R.id.open_menu2 -> {
val intent = Intent(this, SettingsActivity::class.java)
startActivity(intent)
}
R.id.reset_all -> {
reset_to_EN2()
}
}
return super.onOptionsItemSelected(item)
}
}

Since I don't see any declaration of text_view_de or text_view_en, I'm guessing you're using synthetic view properties from the deprecated Android Kotlin Extensions. Assuming that is the case:
When you use text_view_de, it is performing a search in your view hierarchy for the first view it finds with the matching ID. So even though you are doing it within a for loop that iterates through your list of items, you are only working with the same view, over and over.
Edit:
I realized you want to be able to toggle individual views and you were only asking how to add a button to reset all views back to the same language. If this is the case, it does not make sense to add a property to the adapter that controls the state of all views at once like I had suggested in the previous revision of this answer.
Instead, you need to change your data model to have a Boolean that determines which specific language that specific item should show. The problem with how you're doing it now in your click listener is that it is trying to use the Views themselves to determine what state the item is when you change it, but this will cause weird glitches when items scroll off of the screen and back on because ViewHolders get recycled and assigned to different items when they go off and back on screen.
To get started, add a Boolean for the state of the item to your Item class. I don't know exactly what your class looks like now, so adapt this as needed:
data class Item (
val UUID: Long,
val english: String,
val deutsch: String,
var isShowDeutch: Boolean = true
)
A good practice is to have your Adapter class expose a callback for items being clicked so the outside class (Activity) is responsible for manipulating the data model and the Adapter's responsibility is limited to connecting data to views, not manipulating data. So create a callback that the Activity can implement that toggles a single Item's isShowDeutsch property. And when you bind data to a view, use that item's isShowDeutsch to determine visibility.
In Adapter class:
var onItemClickListener: ((itemPosition: Int)->Unit)? = null
//...
// In ViewHolder:
override fun onClick(view: View) {
itemClickListener?.invoke(adapterPosition)
}
//...
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val currentItem = ArrList[position]
holder.textViewDe.text = currentItem.Deutsch
holder.textViewEn.text = currentItem.Englisch
holder.textViewDe.isVisible = currentItem.isShowDeutsch
holder.textViewEn.isVibible = !currentItem.isShowDeutsch
}
In your Activity when you set up your adapter, you can define a click listener for it that toggles the state of that single item and notifies the adapter of the change:
//RECYCLERVIEW
adapter = Adapter(this, ItemList)
recy.layoutManager = LinearLayoutManager(this)
recy.adapter = adapter
adapter.onItemClickListener = { position ->
ItemList[position].apply { isShowDeutsch = !isShowDeutsch }
adapter.notifyItemChanged(position)
}
And finally, to reset all items back to their original language, you can iterate the items in your list and then notify the adapter. This is more appropriate to do in your Activity, since the Adapter should not be responsible for manipulating data.
fun resetLanguage() {
for (item in ItemList) {
item.isShowDeutsch = true
}
adapter.notifyDataSetChanged()
}
I also recommend you change lateinit var ItemList: ArrayList<Item> to val ItemList = ArrayList<Item>(). It is error prone to have a mutable list type in a mutable var property because there are two different ways to change it and it creates the possibility of having your adapter looking at a different list than the one your Activity is working with.

How to disable the auto scroll of a RecyclerView (ListAdapter) that happens when an item is updated?

BACKGROUND
I have a UI that shows a list of users' fullnames with a like/dislike button for each item. I am using a ListAdapter that under the hood uses DiffUtil and AsyncListDiffer APIs. The list of users is received as a LiveData from a Room database and it's ordered by "isLiked".
PROBLEM
Whenever the like button is tapped, Room as I am using a LiveData will re-submit the new data to the adapter. The problem is that as the list is ordered by "isLiked", the liked user will change its position and the RecyclerView will always sroll to the new position.
I don't want to see the new position of the updated item. So, how can I disable the auto scroll behavior?
WHAT I TRIED
MainActivity.kt
..
val userAdapter = UsersAdapter(this)
val ll = LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)
recyclerView.apply {
layoutManager = ll
adapter = userAdapter
itemAnimator = null
setHasFixedSize(true)
}
viewModel.users.observe(this, {
// This will force the recycler view to scroll back to the previous position
// But it's more of a workaround than a clean solution.
val pos = ll.findFirstVisibleItemPosition()
userAdapter.submitList(it) {
recyclerView.scrollToPosition(pos)
}
})
..
UsersAdapter.kt
class UsersAdapter(
private val clickListener: UserClickListener
) : ListAdapter<UserEntity, UsersAdapter.UserViewHolder>(DIFF_CALLBACK) {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): UserViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.item_user, parent, false)
return UserViewHolder(view)
}
override fun onBindViewHolder(holder: UserViewHolder, position: Int) {
val userEntity = getItem(position)
holder.bind(userEntity, clickListener)
}
class UserViewHolder(view: View) : RecyclerView.ViewHolder(view) {
private val textView: TextView = view.findViewById(R.id.fullName)
private val fav: ImageButton = view.findViewById(R.id.fav)
fun bind(user: UserEntity, clickListener: UserClickListener) {
textView.text = user.fullName
val favResId = if (user.favorite) R.drawable.like else R.drawable.dislike
fav.setImageResource(favResId)
fav.setOnClickListener {
val newFav = !user.favorite
val newFavResId = if (newFav) R.drawable.like else R.drawable.dislike
fav.setImageResource(newFavResId)
clickListener.onUserClicked(user, newFav)
}
}
}
interface UserClickListener {
fun onUserClicked(user: UserEntity, isFavorite: Boolean)
}
companion object {
private val DIFF_CALLBACK = object : DiffUtil.ItemCallback<UserEntity>() {
override fun areItemsTheSame(
oldUser: UserEntity,
newUser: UserEntity
) = oldUser.id == newUser.id
override fun areContentsTheSame(
oldUser: UserEntity,
newUser: UserEntity
) = oldUser.fullName == newUser.fullName && oldUser.favorite == newUser.favorite
}
}
}
I tried using a regular RecyclerView adapter and DiffUtil with detect moves set to false.
I added the AsyncListDiffer as well.
I tried the ListAdapter, and even tried the paging library and used the PagedListAdapter.
DiffUtil's callback changes the auto scrolling, but i couldn't get the desired behavior.
Any help is greatly appreciated!

Android: itemdecoration in recyclerview to be text and only if a certain condition is met

I have a recyclerview that shows items that were bought and to be bought. The items are sorted by purchase date which can be in the past and future.
I want to add a separator between the last "past" item and the first "future" one. I know I should add a decorator like the following:
DividerItemDecoration decoration = new DividerItemDecoration(Objects.requireNonNull(getActivity()), VERTICAL);
rvItems.addItemDecoration(decoration);
The decorator is a thin horizontal line that is shown between all items. How can I make the decorator a text, something like "↓ past items ↑ future items" and to be visible only between the relevant items?
Thanks

In such a case I think it is preferable to have a recycler view adapter that supports multiple types of items.
The separators that you call, will be sections
Example:
sealed class Item {
data class Section(val sectionText): Item
data class Purchases(.......): Item
}
Adapter:
class MyAdapter(private val items: List<Item>) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
companion object {
const val TYPE_PURCHASES = 0
const val TYPE_SECTION = 1
}
override fun getItemViewType(position: Int): Int {
val type = when (items[position]) {
is Items.Section -> TYPE_SECTION
// other types...
else -> TYPE_PURCHASES
}
return type
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
val viewHolder: RecyclerView.ViewHolder = when (viewType) {
TYPE_PURCHASES -> {}
// other view holders...
else -> {}
}
return viewHolder
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder?, position: Int) {
when(holder) {
is SectionViewHolder -> bindSectionViewHolder(holder)
is PurchasesViewHolder -> bindSectionViewHolder(holder)
}
}
override fun getItemCount() = items.size
}
Then create the corresponding ViewHolders for each type and instantiate them at onCreateViewHolder.
And when you pass the list of Items in the adapter you should have logic that adds either a Section or an Item to the list.
Similar example from one of my projects:
.subscribeBy(onSuccess = {
val list = mutableListOf<IViewModel>()
val previousBookingDate = Calendar.getInstance()
val bookingDate = Calendar.getInstance()
it.data?.fold(Date(0)) { previousHeader, bookable ->
previousBookingDate.time = previousHeader
bookingDate.time = bookable.getStartDate()
val timeIgnoringComparator = DateUtils.TimeIgnoringComparator()
if (timeIgnoringComparator.compare(previousBookingDate, bookingDate) != 0) {
list.add(SectionViewModel(bookable.getStartDate(), isDefaultSearch || isDefaultCenterSelected()))
}
list.add(BookableItemViewModel(bookable))
bookable.getStartDate()
}
searchResultsLiveData.value = list
}, onError = {
isError.setValue(Event(Pair(null, Runnable { performSearch() })))
})
I suggest taking a look at this library to quickly make lists with different item types.

(Kotlin) Position of RecyclerView returns -1 when trying to click on an item

I'm new to Android development (and Kotlin).
I'm trying to implement a RecyclerView (which works fine) and when I click on a specific row it opens a new activity (Intent).
However, whenever I've press/click on one of the rows, I'm only able to get the value "-1" returned.
I've tried a number of different approaches (you should see the number of tabs in my browser).
This seems like it should be a fairly straightforward occurrence for something as common as a RecyclerView, but for whatever reason I'm unable to get it working.
Here is my RecyclerView Adapter file:
class PNHLePlayerAdapter (val players : ArrayList<PNHLePlayer>, val context: Context) : RecyclerView.Adapter<ViewHolder>() {
var onItemClick: ((Int)->Unit) = {}
// Gets the number of items in the list
override fun getItemCount(): Int {
return players.size
}
// Inflates the item views
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val itemView = LayoutInflater.from(context).inflate(
R.layout.pnhle_list_item,
parent,
false
)
val viewHolder = ViewHolder(itemView)
itemView.setOnClickListener {
onItemClick(viewHolder.adapterPosition)
}
return ViewHolder(itemView)
}
// Binds each item in the ArrayList to a view
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.tvPlayerName?.text = players[position].Name
holder.tvPlayerRank?.text = position.toString()
holder.tvPNHLe?.text = players[position].PNHLe.toString()
holder.tvTeam?.text = players[position].Team
holder.ivLeague?.setImageResource(leagueImageID)
}
}
class ViewHolder (view: View) : RecyclerView.ViewHolder(view) {
val linLayout = view.hor1LinearLayout
val ivTeam = view.teamImageView
val tvPlayerName = view.playerNameTextView
val tvPlayerRank = view.rankNumTextView
val tvPNHLe = view.pnhleTextView
val tvTeam = view.teamTextView
val ivLeague = view.leagueImageView
}
As you can see, there is a class property "onItemClick" which uses a lambda as the click callback.
I setOnClickListener in the onCreateViewHolder method after the view is inflated.
Next, in my Activity I add the list to my Adapter and set the call back.
However, every time I 'Toast' the position it is displayed as '-1'.
val adapter = PNHLePlayerAdapter(list, this)
adapter.onItemClick = { position ->
Toast.makeText(this, position.toString(),Toast.LENGTH_SHORT).show()
var intent = Intent(this, PlayerCardActivity::class.java)
//startActivity(intent)
}
rv_player_list.adapter = adapter
Perhaps I'm not thinking about this properly, but shouldn't the position represent the row number of the item out of the RecyclerView???
Ideally, I need to use the position so that I can obtain the correct item from the 'list' (ArrayList) so that I can pass information to my next Activity using the Intent

I found the issue.
Change this line in onCreateViewHolder:
return ViewHolder(itemView)
to this one:
return viewHolder

I would reorganize the adapter like this:
class PNHLePlayerAdapter : androidx.recyclerview.widget.RecyclerView.Adapter<Adapter.ViewHolder>() {
interface AdapterListener {
fun onItemSelected(position: Int?)
}
var players: List<Player> = listOf()
set(value) {
field = value
this.notifyDataSetChanged()
}
var listener: AdapterListener? = null
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val view = LayoutInflater.from(parent.context)
.inflate(R.layout.item_car_selector, parent, false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.bind(position)
}
override fun getItemCount(): Int {
return brands.size
}
inner class ViewHolder(view: View): androidx.recyclerview.widget.RecyclerView.ViewHolder(view) {
private var position: Int? = null
private val baseView: LinearLayout? = view.findViewById(R.id.baseView) as LinearLayout?
...
init {
baseView?.setOnClickListener {
listener?.onManufacturerSelected(position)
}
}
fun bind(position: Int) {
this.position = position
...
}
}
}
And from your activity/fragment set the listener as adapter.listener = this, and implement the onItemSelected(position: Int?)
override fun onItemSelected(position: Int?) {
...
}