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kotlin error recycler view with gridlayout type was mismatched

im facing errors in recyclerView here is //
data class categories(
val Name: String,
val Image:Int
)
here is model /////
object CategoriesModel {
fun getImages(): ArrayList<categories> {
val ImagesList = ArrayList<categories>()
val categoryFirst = categories(
"Memmals",R.drawable.memmals
)
ImagesList.add(categoryFirst)
val categorySecond = categories(
"Memmals",R.drawable.fish
)
ImagesList.add(categorySecond)
return ImagesList
}
}
//// adapter///
class CategoriesAdapter(private val itemList: ArrayList) :
RecyclerView.Adapter<CategoriesAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CategoriesAdapter.ViewHolder {
val view =LayoutInflater.from(parent.context)
.inflate(R.layout.memmals, parent,false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: CategoriesAdapter.ViewHolder, position: Int) {
holder.bind(categories("Memmals",2))
}
override fun getItemCount(): Int {
return itemList.size
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bind(category: categories) {
val textViewName = itemView.findViewById<TextView>(R.id.txtCategory)
textViewName.text = category.Name
val txtImage=itemView.findViewById<View>(R.id.image)
txtImage.id=category.Image
}
}
}
/////main activity///
class MainActivity : AppCompatActivity() {
private lateinit var mAdapter: CategoriesAdapter
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
binding= ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
binding.recyclerView.setOnClickListener{
val intent=Intent(this,Level1::class.java)
startActivity(intent)
}
val recyclerView = findViewById<RecyclerView>(R.id.recyclerView)
recyclerView.layoutManager = GridLayoutManager(this,2)
val itemList = ArrayList<CategoriesModel>()
// from here
itemList.add(categories("Memmals",R.drawable.memmals))
itemList.add(categories("Fishes",R.drawable.fish))
itemList.add(categories("Arthropods",R.drawable.dear))
itemList.add(categories("Yalk",R.drawable.yalk))
//to here errors are there
//Adapter setting
mAdapter = CategoriesAdapter(itemList)
recyclerView.adapter = mAdapter
}
}
/// here is the error///
MainActivity.kt: (34, 22): Type mismatch: inferred type is categories but CategoriesModel was expected

MainActivity.kt
val itemList = ArrayList<CategoriesModel>()
should be changed to
val itemList = ArrayList<categories>()
because you are using CategoriesModel object and expected is categories.

List is not updated after notifyDataSetChanged what should I do?

I am fetching JSON data from API and passing it in recycler view but if I want to fetch new data and display it in recycler view then I have to clear the list and then add new data in that list and notify the adapter that the data is changed but it is not updated what should I do?
MainActivity.kt
class MainActivity : AppCompatActivity() {
private lateinit var recipeViewModel: RecipeViewModel
private lateinit var mainBinding: ActivityMainBinding
private lateinit var recipeAdapter: RecipeAdapter
private lateinit var recipeItemList: ArrayList<Hit>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
mainBinding = ActivityMainBinding.inflate(layoutInflater)
setContentView(mainBinding.root)
recipeViewModel =
ViewModelProvider(
this,
ViewModelProvider.AndroidViewModelFactory
.getInstance(application)
)[RecipeViewModel::class.java]
recipeItemList = arrayListOf()
mainBinding.recyclerView.layoutManager = LinearLayoutManager(this)
mainBinding.recyclerView.hasFixedSize()
recipeAdapter = RecipeAdapter(this)
mainBinding.recyclerView.adapter = recipeAdapter
recipeViewModel.recipeLiveData.observe(this, Observer { recipeItems ->
recipeItemList.addAll(recipeItems.hits)
recipeAdapter.updateRecipes(recipeItemList)
Log.d("RESPONSE", recipeItems.toString())
Log.d("List size", recipeAdapter.itemCount.toString())
})
searchRecipeName()
}
private fun searchRecipeName() {
mainBinding.searchRecipeFabBtn.setOnClickListener {
val view = layoutInflater.inflate(R.layout.recipe_search_layout, null)
val searchRecipeET = view.findViewById<EditText>(R.id.searchRecipeET)
val searchRecipeBtn = view.findViewById<Button>(R.id.searchRecipeBtn)
val bottomSheetDialog = BottomSheetDialog(this)
bottomSheetDialog.apply {
this.setContentView(view)
this.show()
}
searchRecipeBtn.setOnClickListener {
val recipeName = searchRecipeET.text.toString()
searchRecipeName(recipeName, searchRecipeET, bottomSheetDialog)
}
}
}
private fun searchRecipeName(
recipeName: String,
searchRecipeET: EditText,
bottomSheetDialog: BottomSheetDialog
) {
if (recipeName.isEmpty()) {
searchRecipeET.error = "Please enter recipe name"
} else {
recipeViewModel.getRecipes(recipeName)
bottomSheetDialog.dismiss()
}
}
}
RecipeAdapter.kt
class RecipeAdapter(val context: Context) : RecyclerView.Adapter<RecipeAdapter.RecipeViewHolder>() {
private val recipesList: ArrayList<Hit> = arrayListOf()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecipeViewHolder {
val layoutInflater = LayoutInflater.from(context)
val view = layoutInflater.inflate(R.layout.recipe_items_layout, null, false)
return RecipeViewHolder(view)
}
override fun onBindViewHolder(holder: RecipeViewHolder, position: Int) {
val currentItem = recipesList[position]
holder.recipeImageView.load(currentItem.recipe.image)
holder.recipeNameText.text = currentItem.recipe.label
}
override fun getItemCount(): Int {
return recipesList.size
}
class RecipeViewHolder(itemView: View) :RecyclerView.ViewHolder(itemView) {
val recipeImageView: ImageView = itemView.findViewById(R.id.recipeImageView)
val recipeNameText: TextView = itemView.findViewById(R.id.recipeNameText)
}
fun updateRecipes(newRecipesList: ArrayList<Hit>){
recipesList.clear()
Log.d("RECIPE SIZE", "${recipesList.size}")
recipesList.addAll(newRecipesList)
notifyDataSetChanged()
}
}

This may be helpful.
Be careful of this :
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
mainBinding = ActivityMainBinding.inflate(layoutInflater)
setContentView(mainBinding.root)
recipeViewModel =
ViewModelProvider(
this,
ViewModelProvider.AndroidViewModelFactory
.getInstance(application)
)[RecipeViewModel::class.java]
recipeItemList = arrayListOf()
mainBinding.recyclerView.layoutManager = LinearLayoutManager(this)
mainBinding.recyclerView.hasFixedSize()
recipeAdapter = RecipeAdapter(this)
mainBinding.recyclerView.adapter = recipeAdapter
recipeViewModel.recipeLiveData.observe(this, Observer { recipeItems ->
// You're adding items here but never clear the list
// list will be bigger every time you'll be notified
// recipeItemList.addAll(recipeItems.hits
// recipeAdapter.updateRecipes(recipeItemList)
// Do this instead
recipeItemList = recipeItems.hits
recipeAdapter.updateRecipes(recipeItemList)
Log.d("RESPONSE", recipeItems.toString())
Log.d("List size", recipeAdapter.itemCount.toString())
})
searchRecipeName()
}
Also, here: It's a little better to do this (https://stackoverflow.com/a/10298038/4221943)
fun updateRecipes(newRecipesList: ArrayList<Hit>){
recipesList = newRecipesList
Log.d("RECIPE SIZE", "${recipesList.size}")
notifyDataSetChanged()
}
BTW it will always be more efficient to use the more specific change events if you can. Rely on notifyDataSetChanged() as a last resort. It is also good practice to use notifyItemInserted(mItems.size() - 1) for "easier" solution.

You could convert the RecyclerView.Adapter into a ListAdapter:
class RecipeAdapter(val context: Context) : ListAdapter<Hit, RecipeAdapter.RecipeViewHolder>(RecipeDiffCallback()) {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecipeViewHolder {
val layoutInflater = LayoutInflater.from(context)
val view = layoutInflater.inflate(R.layout.recipe_items_layout, null, false)
return RecipeViewHolder(view)
}
override fun onBindViewHolder(holder: RecipeViewHolder, position: Int) {
val currentItem = getItem(position)
holder.recipeImageView.load(currentItem.recipe.image)
holder.recipeNameText.text = currentItem.recipe.label
}
class RecipeViewHolder(itemView: View) :RecyclerView.ViewHolder(itemView) {
val recipeImageView: ImageView = itemView.findViewById(R.id.recipeImageView)
val recipeNameText: TextView = itemView.findViewById(R.id.recipeNameText)
}
}
class RecipeDiffCallback : DiffUtil.ItemCallback<Hit>() {
// Change this condition based on the attribute of `Hit` that will change
override fun areItemsTheSame(oldItem: Hit, newItem: Hit): Boolean = oldItem.id == newItem.id
override fun areContentsTheSame(oldItem: Hit, newItem: Hit): Boolean = oldItem == newItem
}
Then update its content with the submitList method.
Every item not satisfying the RecipeDiffCallback conditions will be automatically updated:
recipeViewModel.recipeLiveData.observe(this, Observer { recipeItems ->
recipeAdapter.submitList(recipeItems.hits)
})

RecyclerView Adapter with ViewDataBinding

I am creating a GenericAdapter for handling single row|item layouts. Everything working fine only view-binding is not updating data..
I want to get RecyclerView.ViewHolder binding in callback ,I know I can bind it in adapter using BR.item and executePending
I want viewDataBinding context in a Callback
holder.binding.name.text = mutableList[pos]
Above line in TestActivity not working properly
GenericAdapter.kt
class GenericAdapter<T,VB:ViewDataBinding>(
var items:MutableList<T>,
#LayoutRes val resLayoutID:Int,
val onBind:(holder:GenericViewHolder<T,VB>,pos:Int) -> Unit
): RecyclerView.Adapter<GenericViewHolder<T,VB>>() {
lateinit var mItemBinding:VB
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): GenericViewHolder<T,VB> {
val layoutInflater = LayoutInflater.from(parent.context)
mItemBinding = DataBindingUtil.inflate(layoutInflater, resLayoutID, parent, false)
return GenericViewHolder(mItemBinding)
}
override fun onBindViewHolder(holder: GenericViewHolder<T,VB>, position: Int) {
onBind(holder,position)
}
override fun getItemCount(): Int = items.size
}
GenericViewHolder.kt
class GenericViewHolder<T,VB: ViewDataBinding>(val binding: VB)
:RecyclerView.ViewHolder(binding.root){
val mItemBinding:VB = binding
}
TestActivity.kt
class TestActivity:AppCompatActivity() {
lateinit var recyclerView: RecyclerView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_test)
recyclerView = findViewById(R.id.recyclerView)
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.setHasFixedSize(true)
populateList()
}
private fun populateList(){
val mutableList = mutableListOf<String>("apple","mango","tutti fruti","apricot",
"apple","mango","tutti fruti","apricot",
"apple","mango","tutti fruti","apricot",
"apple","mango","tutti fruti","apricot")
val mAdapter = GenericAdapter<String,ItemCountryBinding>(mutableList,R.layout.item_country){ holder,pos ->
//val nameTv = holder.itemView.findViewById<TextView>(R.id.name)
//nameTv.text = mutableList[pos]
holder.binding.name.text = mutableList[pos]
}
recyclerView.adapter = mAdapter
}
}
Where as below code working fine
val nameTv = holder.itemView.findViewById<TextView>(R.id.name)
nameTv.text = mutableList[pos]

I would recommend do onBind inside view holder.
I don't see reason why you need this callback.
You already passed mutableList to the adapter.
For example here is my ViewHolder
class NewsViewHolder(private val binding: ListItemNewsBinding) : RecyclerView.ViewHolder(binding.root) {
fun bind(news: RedditPost, itemClick: (RedditPost, View) -> Unit) {
with(binding) {
root.transitionName = news.thumbnail
root.setOnClickListener { itemClick.invoke(news, binding.root) }
title.text = news.title
image.setImageUrl(news.thumbnail)
author.text = news.author
xHoursAgo.text = news.created_utc
numComments.text = news.numComments
}
}
}
And
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
if (isLoadingMore && position == (itemCount - 1)) return
(holder as? NewsViewHolder)?.bind(news[position], itemClick)
}

How to sort encrypted ArrayList and show this in a RecyclerView

My target is to sort in alphabetical order data from an ArrayList with encrypted data and put correct order into a RecyclerView.
I'm able to show decrypted data into RecyclerView, but in the same order witch I use to add item into the ArrayList (see code in adapter).
I tried to sort with sortby{}without success (see code in activity). The result is an partial order and onItemClick not return correct position.
My activity that extend adapter:
class HomeActivity : AppCompatActivity(),DocumentAdapter.OnItemClickListener {
companion object{
lateinit var dbHandler: DBHandler
}
private var documentslist = ArrayList<PassItem>()
private lateinit var adapter : RecyclerView.Adapter<*>
private lateinit var rv : RecyclerView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_home)
dbHandler = DBHandler(this, null, null,1)
viewDocuments()
val fab = findViewById<FloatingActionButton>(R.id.fabAdd)
fab.setOnClickListener {
val i = Intent(this, AddDocument :: class.java)
startActivity(i)
}
}
#SuppressLint("WrongConstant")
private fun viewDocuments(){
documentslist = dbHandler.getDocuments(this)
//documentslist.sortBy { it.PassItemApp.toString() } ---> this sort encrypted data then not in alphabetic order and onItemClick return uncorrect position
adapter = DocumentAdapter(this,documentslist,this)
rv = findViewById(R.id.recyclerView)
rv.layoutManager = LinearLayoutManager(this, LinearLayout.VERTICAL,false)
rv.adapter = adapter
}
override fun onItemClick(position: Int) {
val intent = Intent(this#HomeActivity,DocActivity::class.java)
intent.putExtra("clickedPosition", position)
startActivity(intent)
}
override fun onResume() {
viewDocuments()
super.onResume()
}
and my adapter:
class DocumentAdapter(val mCtx: Context, private val documents: ArrayList<PassItem>, val listener: OnItemClickListener) : RecyclerView.Adapter<DocumentAdapter.ViewHolder>(){
interface OnItemClickListener{
fun onItemClick(position : Int)
}
inner class ViewHolder(itemView : View) : RecyclerView.ViewHolder(itemView), View.OnClickListener{
val txtDocApp : TextView = itemView.findViewById(R.id.txtDocApp)
init {
itemView.setOnClickListener(this)
}
override fun onClick(v: View?) {
val position : Int = adapterPosition
if (position != RecyclerView.NO_POSITION){
listener.onItemClick(position)
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DocumentAdapter.ViewHolder {
val v = LayoutInflater.from(parent.context).inflate(R.layout.item_pass_layout,parent,false)
return ViewHolder(v)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val document : PassItem = documents[position]
//Decryption of item showed in Recyclerview
val initialisationVector = document.PassItemIvApp
val bytesIV = Base64.decode(initialisationVector, Base64.NO_WRAP)
val oisIV = ObjectInputStream(ByteArrayInputStream(bytesIV))
val initializationVectorIV = oisIV.readObject() as ByteArray
val encryptedText = document.PassItemApp
val bytesText = Base64.decode(encryptedText, Base64.NO_WRAP)
val oisText = ObjectInputStream(ByteArrayInputStream(bytesText))
val textByteArray = oisText.readObject() as ByteArray
val key = document.PassItemKeyApp
val keyText = Base64.decode(key, Base64.NO_WRAP)
val oisKey = ObjectInputStream(ByteArrayInputStream(keyText))
val keyToDecrypt = oisKey.readObject() as SecretKey
val aesDecrypt = Decrypted(keyToDecrypt,initializationVectorIV)
val decryptedByteArray = aesDecrypt.decrypt(textByteArray)
val textAfterDecryption = decryptedByteArray.toString(charset("UTF_8"))
//Data in Recyclerview
holder.txtDocApp.text = textAfterDecryption
}
override fun getItemCount(): Int {
return documents.size
}
}

using Retrofit enqueue calls getting problem

getting this error for enqueue for kotlin android and it is showing Unresolved reference: enqueue
my code
class NewsActivity : AppCompatActivity() {
private lateinit var mRecyclerView: RecyclerView
private lateinit var mProgressBar: ProgressBar
private lateinit var mAdapter: NewsAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_news)
mRecyclerView = findViewById(R.id.recycler_view)
mProgressBar = findViewById(R.id.progress_circular)
getItemList()
}
private fun getItemList() {
mProgressBar.visibility = View.VISIBLE
val apical = ApiClient.create().getData()
apical.enqueue(object : retrofit2.Callback<List<DataModelItem>> {
override fun onFailure(call: Call<List<DataModelItem>>, t: Throwable) {
mProgressBar.visibility = View.GONE
}
override fun onResponse(
call: Call<List<DataModelItem>>,
response: Response<List<DataModelItem>>) {
if (response.isSuccessful){
val itemListNews = response.body()!!
mAdapter = NewsAdapter(itemListNews)
val layoutManager = LinearLayoutManager(this#NewsActivity)
mRecyclerView.layoutManager = layoutManager
mRecyclerView.adapter = mAdapter
}
}
})
}
}
this is News activity
class NewsAdapter(private val itemList : List<DataModelItem>) : RecyclerView.Adapter<NewsAdapter.CustomViewHolder>() {
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): NewsAdapter.CustomViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.item_view, parent, false)
return CustomViewHolder(view)
}
override fun getItemCount(): Int {
return itemList.size
}
override fun onBindViewHolder(holder: NewsAdapter.CustomViewHolder, position: Int) {
val itemData = itemList.get(position)
Picasso.get().load(itemData.images).into(holder.img1)
holder.Titlenews.setText(itemData.title)
holder.txt_description.setText(itemData.summary)
holder.publish_time.setText(itemData.publish_date)
}
inner class CustomViewHolder(view: View): RecyclerView.ViewHolder(view){
var img1:ImageView
var Titlenews: TextView
var txt_description: TextView
var publish_time: TextView
init {
img1 = view.findViewById(R.id.item_image)
Titlenews = view.findViewById(R.id.Titlenews)
txt_description = view.findViewById(R.id.txt_description)
publish_time = view.findViewById(R.id.publish_time)
}
}
}
this is the news adapter
object ApiClient {
var BASE_URL = ""
fun create() :Api{
val retrofit = Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create())
.baseUrl(BASE_URL)
.build()
return retrofit.create(Api::class.java)
}
}
this is Api client
Help required
I want not getting a solution as always it is giving me an error for enqueue .

Try changing
apical.enqueue(object : retrofit2.Callback<List<DataModelItem>> {
to
apical.enqueue(object : retrofit.Callback<List<DataModelItem>> {