Develop Reference

Trying to open another activity in recycles view using onclick

Trying to get a button to open another activity in android studio using kotlin. I am user a recycles view to do so. I have view card and want to edit the data in the card so I am user onClick to get the page to respond but that does seem to work I tried researching it but nothing come up that I can make sense of. Here is the code.
Thank you for all your help I appreciate it
This is the adapter class:
```class EventAdapter(var mListener: onItemClickListener, var context: Context, val items: ArrayList<EventModelk>):
RecyclerView.Adapter<EventAdapter.ViewHolder>() {
interface onItemClickListener {
fun onItemClick(position: Int)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val itemview = LayoutInflater.from(context).inflate(
R.layout.eventitems,
parent,
false,
)
return ViewHolder(itemview, mListener)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val item = items[position]
holder.setEmail.text = item.eEmail
holder.setNotes.text = item.nNotes
holder.setData.text = item.dDate
holder.setTime.text = item.tTime
if (item.repeat == 1) {
holder.setReap.isChecked = true
// holder.setReap.text = item.repeat.toString()
}
if (position % 2 == 0) {
holder.main.setBackgroundColor(
ContextCompat.getColor(
context,
R.color.colorLightGray
)
)
} else {
holder.main.setBackgroundColor(ContextCompat.getColor(context, R.color.colorWhite))
}
holder.pushimg.setOnClickListener {
if (context is UpdateDataInfo) {
(context as UpdateDataInfo).updateEvent(item)
}
}
// interface onItemClickListener{
// fun onItemClick(position: Int)
}
override fun getItemCount(): Int {
return items.size
}
class ViewHolder(view: View,onItemClickListener: onItemClickListener): RecyclerView.ViewHolder(view),onItemClickListener {
val main: CardView = view.IIMain
val setData: TextView = view.set_date
val setTime: TextView = view.set_time
val setEmail: TextView = view.Tv_email
val setNotes: TextView = view.set_note
val setReap: CheckBox =view.is_repeat
val pushimg: ImageView = view.img_edit
val onItemClickListener = onItemClickListener
override fun onItemClick(position: Int) {
onItemClickListener.onItemClick(absoluteAdapterPosition)
}
}
}```
This is my code for getting the click to go to another activity:
class CurrentSch : AppCompatActivity(), EventAdapter.onItemClickListener {
//private var change =imageView2?.isClickable
var STORAGE_LOCAL =true
val eventlist = ArrayList<EventModelk>()
#RequiresApi(Build.VERSION_CODES.N)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.currentsch)
btnNewApp2.setOnClickListener {
val intent = Intent(this, NewPlan::class.java)
startActivity(intent)
}
seeAllEventInPlan()
}
//private var change =imageView2?.isClickable
private fun getEventist(): ArrayList<EventModelk>{
val eventdatabase = EventDatabasek(this)
return eventdatabase.veiwEvent()
}
fun seeAllEventInPlan() = if(getEventist().size >0){
ryc_eventLists.visibility = View.VISIBLE
viewnotview.visibility = View.GONE
ryc_eventLists.layoutManager = LinearLayoutManager(this)
val eventAdapter = EventAdapter(this,this, getEventist())
ryc_eventLists.adapter = eventAdapter
}else{
ryc_eventLists.visibility = View.GONE
viewnotview.visibility = View.VISIBLE
}
override fun onItemClick(position: Int) {
val item = eventlist[position]
img_edit.setOnClickListener {
val intent = Intent(this, UpdateDataInfo::class.java)
intent.putExtra("Events", position)
startActivity(intent)
}
}
}

Inside the onBindViewHolder function, simply call mListener.onItemClick(position) for example if you wanted to open another Activity on click of setData, then you can write below code in onBindViewHolder
holder.setData.setOnClickListener { mListener.onItemClick(position) }

according to your above code , you have made callbacks where you calling thee adapter you will get callback there and you will open a activity there .. .. but you can simple open your new activity from adapter like this ..
holder.itemView.setOnClickListener(View.OnClickListener {
val intent = Intent (context,SomeActivity::class.java)
context.startactivity(intent)
})

mvp recycler adapter not showing data

The problem I am facing with the RecyclerView is the data is coming from Server and the API response is getting printed correctly in the console.
but when I am trying to set data in the adapter what is wrong or something is not going correctly with the flow that the data is not being updated on UI.
//This is my adapter class
class DashboardAdapter(val context: Context) : RecyclerView.Adapter<DashBoardHolder>() {
private var transactionList = ArrayList<DashboardData>()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DashBoardHolder {
val inflator = LayoutInflater.from(parent.context)
val view = ActivityDashboardDataBinding.inflate(inflator, parent, false)
val viewHolder = DashBoardHolder(view)
return viewHolder
}
override fun onBindViewHolder(holder: DashBoardHolder, position: Int) {
val quickModel = transactionList[position]
holder.tvName.text = quickModel.bookingTitle
}
fun showListItems(dashboardlist: List<DashboardData>?, aboolean: Boolean) {
when {
aboolean -> transactionList.clear()
}
if (dashboardlist != null && !dashboardlist.isEmpty())
this.transactionList.addAll(dashboardlist)
notifyDataSetChanged()
}
override fun getItemCount(): Int {
return transactionList.size
}
}
MyHolderClass
class DashBoardHolder(val binding: ActivityDashboardDataBinding) :
RecyclerView.ViewHolder(binding.root) {
var tvName: TextView = binding.textViewGrandrukName
var tvTime: TextView = binding.tvGrandrukTripDetails
var tvPlace: ImageView = binding.btnGhandruk
var ivRectangle: ImageView = binding.imageView5
}
Similarly,I set the adapter in view section like this way:
//setting adapter in Presenter class
fun setAdapter() {
var layoutmanager: LinearLayoutManager? = LinearLayoutManager(appCompatActivity)
val firstVisiblePosition = layoutmanager!!.findFirstVisibleItemPosition()
binding!!.includesDashboardRecyclerview.rvBookingList.setHasFixedSize(true)
binding!!.includesDashboardRecyclerview.rvBookingList.layoutManager = layoutmanager
binding!!.includesDashboardRecyclerview.rvBookingList.adapter = dashboardAdapter
layoutmanager!!.scrollToPositionWithOffset(firstVisiblePosition, 0)
}
In Presenter Class, calling setAdapter class from presenter like this way
class DashboardPresenter(
private val dashboardView: DashboardView,
private val dashboardModel: DashboardModel
) {
fun onCreateView() {
onClick()
dashboardView.setAdapter()
getDashboardRequest()
}
//calling adpter function here
fun showList(termlist: List<DashboardData>?, aboolean: Boolean) {
(null as DashboardAdapter?)?.showListItems(termlist!!, aboolean)
}
}
I'm not able to understand what is getting wrong here.

(null as DashboardAdapter?)?.showListItems(termlist!!, aboolean)
You are calling showListItems() on the DashboardAdapter as a type not the instance dashboardAdapter. Assuming that dashboardAdapter is a local class field.
Also I guess this type casting is not necessary as you already using the optional ?
So, it can be simplified to:
dashboardAdapter?.showListItems(termlist!!, aboolean)
Assuming that this should be called whenever you retrieve the API response. So, showList() must be called when there's new API data.

Android Recycleview Multiple ViewTypes not working in kotlin

I have an app which uses Room Database to show data in recycleview. It works fine when i load data seperately from different tables. But i want to show data from both tables in a single recycleview with multiple viewtypes, i know how to combine tables in room but it's not working. I get empty cards in recycleview when i load the data. Here is what i have tried so far.
My Adapter Class
class CategoriesAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
companion object {
private const val TYPE_CATEGORIES = 0
private const val TYPE_ARTICLES = 1
}
private val items: MutableList<Any> by lazy {
ArrayList<Any>()
}
fun setItems(list: List<Any>) {
items.addAll(list)
notifyDataSetChanged()
}
override fun getItemViewType(position: Int): Int {
return if (items[position] is Categories) TYPE_CATEGORIES else TYPE_ARTICLES
}
override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
return when (viewType) {
TYPE_CATEGORIES -> CategoriesViewHolder.create(viewGroup)
else -> ArticlesViewHolder.create(viewGroup)
}
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
when (holder) {
is CategoriesViewHolder -> {
if (items[position] is Categories)
holder.bind(items[position] as Categories)
}
is ArticlesViewHolder -> {
if (items[position] is Articles)
holder.bind(items[position] as Articles)
}
}
}
override fun getItemCount(): Int {
return items.size
}
}
class CategoriesViewHolder (parent: View) : RecyclerView.ViewHolder(parent) {
val textView: TextView = parent.findViewById(R.id.categories_textView)
fun bind(category: Categories) {
textView.text = category.categoryName
}
companion object {
fun create(parent: ViewGroup): CategoriesViewHolder {
return CategoriesViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.categories_item_layout, parent, false))
}
}
}
class ArticlesViewHolder (parent: View) : RecyclerView.ViewHolder(parent) {
val textView: TextView = parent.findViewById(R.id.titleText)
fun bind(articles : Articles) {
textView.text = articles.articleName
}
companion object {
fun create(parent: ViewGroup): ArticlesViewHolder {
return ArticlesViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.article_item_layout, parent, false))
}
}
}
this is how i set data from my activity
val db = AppDatabase.getDatabase(applicationContext)
dao = db.articleDao()
val recyclerView = findViewById<RecyclerView>(R.id.categories_recycle_view)
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.adapter = CategoriesAdapter()
adapter.setItems(dao.getAllArticlesAndCategories())
Can anyone help.
P.s i'm new to kotlin

Instead of
adapter.setItems(dao.getAllArticlesAndCategories())
Use live data observer to avoid processing on main thread and debug in observe function of live data to confirm you are receiving correct data from DB.

calling code one line of code is missing
val db = AppDatabase.getDatabase(applicationContext)
dao = db.articleDao()
val recyclerView = findViewById<RecyclerView>(R.id.categories_recycle_view)
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.adapter = CategoriesAdapter()
adapter.setItems(dao.getAllArticlesAndCategories())
it should be:
val db = AppDatabase.getDatabase(applicationContext)
dao = db.articleDao()
val recyclerView = findViewById<RecyclerView>(R.id.categories_recycle_view)
recyclerView.layoutManager = LinearLayoutManager(this)
adapter=CategoriesAdapter()
adapter.setItems(dao.getAllArticlesAndCategories())
recyclerView.adapter = adapter
I would like to thank for the question and the code

How to create a generic Adapter in Kotlin?

I have 3 similars adapters and I want to combine them in 1. The only thing that is different is the ArrayList type. I have 2 room entities for room, FavoriteArticle, and HistoryArticle, but they have the same fields as WikiPage.
class Adapter<T> (#LayoutRes private val layoutRes: Int) : RecyclerView.Adapter<Holder>() {
val currentResult: ArrayList<T> = ArrayList()
override fun getItemCount() = currentResult.size
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
val cardItem = LayoutInflater.from(parent.context).inflate(layoutRes, parent, false)
return Holder(cardItem)
}
override fun onBindViewHolder(holder: Holder, position: Int) {
val page = currentResult[position]
holder.updateWithPage(page)
}
fun add(wiki: ArrayList<T>?) { {
currentResult.clear()
if (wiki != null) {
currentResult.addAll(wiki)
}
}
}
Holder class:
class Holder(itemView: View) : RecyclerView.ViewHolder(itemView) {
private val articleImageView: ImageView = itemView.findViewById(R.id.articleCardItemImage)
private val titleTextView: TextView = itemView.findViewById(R.id.articleCardItemTitle)
private lateinit var currentPage: WikiPage
init {
itemView.setOnClickListener {
itemView.context.startActivity(ArticleDetailActivity.createStartIntent(itemView.context, currentPage))
}
}
fun updateWithPage(page: WikiPage) {
currentPage = page
titleTextView.text = page.title
Picasso.get().load(page.thumbnail.source).into(articleImageView)
}
}
I can't figure out how to modify my updateWithPage function from onBindViewHolder using generics. How can I do this?

Some idea for your reference by using Interface:
interface Article {
getWikiPage(): WikiPage
}
class FavoriteArticle : Article {
getWikiPage() = wikiPage
}
class HistoryArticle: Article {
getWikiPage() = wikiPage
}
// Adapter
class Adapter<Article>
...
override fun onBindViewHolder(holder: Holder, position: Int) {
val page = currentResult[position].getWikiPage()
holder.updateWithPage(page)
}
...

You can make a generalized adapter that can accept any viewholder class. This will require pushing the viewholder creation logic inside the viewholder class itself. Using some kotlin extension functions can even be a lot cleaner for this use case.
Check out this link: https://thecommonwise.com/blogs/60f6ea9bea3d10001503eac3

Button Checklist all on Recyclerview does not work

I have recyclerview with checkbox and I want to checklist all the data using button. I have trying this tutorial, but when i click the button, the log is call the isSelectedAll function but can't make the checkbox checked. what wrong with my code?
this is my adapter code
var isSelectedAll = false
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListApproveDeatilViewHolder {
val itemView = LayoutInflater.from(parent.context)
.inflate(R.layout.activity_list_approve_row, parent, false)
return ListApproveDeatilViewHolder(itemView)
}
private lateinit var mSelectedItemsIds: SparseBooleanArray
fun selectAll() {
Log.e("onClickSelectAll", "yes")
isSelectedAll = true
notifyDataSetChanged()
}
override fun onBindViewHolder(holder: ListApproveDeatilViewHolder, position: Int) {
val approve = dataSet!![position]
holder.soal.text = approve.title
holder.kategori.text = approve.kategori
if (!isSelectedAll){
holder.checkBox.setChecked(false)
} else {
holder.checkBox.setChecked(true)
}
}
and this is my activity code
override fun onCreate(savedInstanceState: Bundle?) {
private var adapter: ListApproveDetailAdapter? = null
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_list_approve)
ButterKnife.bind(this)
getData()
// this is my button onclick code
select.setOnClickListener(){
if (select.getText().toString().equals("Select all")){
Toast.makeText(this, "" + select.getText().toString(), Toast.LENGTH_SHORT).show()
adapter?.selectAll()
select.setText("Deselect all")
} else {
Toast.makeText(this, "" + select.getText().toString(), Toast.LENGTH_SHORT).show()
select.setText("Select all")
}
}
}
//this is for get my data for the recyclerview
fun getData() {
val created_by = intent.getStringExtra(ID_SA)
val tgl_supervisi = intent.getStringExtra(TGL_SURVEY)
val no_dlr = intent.getStringExtra(NO_DLR)
API.getListApproveDetail(created_by, tgl_supervisi, no_dlr).enqueue(object : Callback<ArrayList<ListApprove>> {
override fun onResponse(call: Call<ArrayList<ListApprove>>, response: Response<ArrayList<ListApprove>>) {
if (response.code() == 200) {
tempDatas = response.body()
Log.i("Data Index History", "" + tempDatas)
recyclerviewApprove?.setHasFixedSize(true)
recyclerviewApprove?.layoutManager = LinearLayoutManager(this#ListApproveActivity)
recyclerviewApprove?.adapter = ListApproveDetailAdapter(tempDatas)
adapter?.notifyDataSetChanged()
} else {
Toast.makeText(this#ListApproveActivity, "Error", Toast.LENGTH_LONG).show()
}
swipeRefreshLayout.isRefreshing = false
}
override fun onFailure(call: Call<ArrayList<ListApprove>>, t: Throwable) {
Toast.makeText(this#ListApproveActivity, "Error", Toast.LENGTH_SHORT).show()
swipeRefreshLayout.isRefreshing = false
}
})
}
thankyou for any help :)

I am posting the answer with implementation of demo project. I haven't modified your code but as per your requirement i have done this.
MainActivity class:
class MainActivity : AppCompatActivity() {
var selectAll: Boolean = false;
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val recyclerView = findViewById<RecyclerView>(R.id.recyclerView) as RecyclerView
val btnSelectAll = findViewById<Button>(R.id.btnSelectAll) as Button
//adding a layoutmanager
recyclerView.layoutManager = LinearLayoutManager(this, LinearLayout.VERTICAL, false)
//crating an arraylist to store users using the data class user
val users = ArrayList<User>()
//adding some dummy data to the list
users.add(User("Piyush", "Ranchi"))
users.add(User("Mehul", "Chennai"))
users.add(User("Karan", "TamilNadu"))
users.add(User("Bela", "Kolkata"))
//creating our adapter
val adapter = CustomAdapter(users, selectAll)
//now adding the adapter to recyclerview
recyclerView.adapter = adapter
btnSelectAll.setOnClickListener {
if (!selectAll) {
selectAll = true
} else {
selectAll = false
}
adapter?.selectAllCheckBoxes(selectAll)
}
}
}
User class:
data class User(val name: String, val address: String)
Adapter class:
class CustomAdapter(val userList: ArrayList<User>, val selectAll: Boolean) :
RecyclerView.Adapter<CustomAdapter.ViewHolder>() {
var selectAllA = selectAll;
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CustomAdapter.ViewHolder {
val v = LayoutInflater.from(parent.context).inflate(R.layout.list_layout, parent, false)
return ViewHolder(v)
}
override fun onBindViewHolder(holder: CustomAdapter.ViewHolder, position: Int) {
holder.textViewName.text = userList[position].name;
if (!selectAllA){
holder.checkBox.setChecked(false)
} else {
holder.checkBox.setChecked(true)
}
}
//this method is giving the size of the list
override fun getItemCount(): Int {
return userList.size
}
//the class is hodling the list view
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val textViewName = itemView.findViewById(R.id.textViewUsername) as TextView
val checkBox = itemView.findViewById(R.id.checkbox) as CheckBox
}
fun selectAllCheckBoxes(selectAll: Boolean) {
selectAllA = selectAll
notifyDataSetChanged()
}
}

As i already mentioned in comments you are using two different adapter instance .
Now i see you have declared adapter globally .
Just modify your code as follows and make sure response.body() have data int it :
if (response.code() == 200) {
tempDatas = response.body()
Log.i("Data Index History", "" + tempDatas)
recyclerviewApprove?.setHasFixedSize(true)
recyclerviewApprove?.layoutManager = LinearLayoutManager(this#ListApproveActivity)
adapter = ListApproveDetailAdapter(tempDatas)
recyclerviewApprove?.adapter=adapter
} else {
Toast.makeText(this#ListApproveActivity, "Error", Toast.LENGTH_LONG).show()
}

Add one variable in model class.
like var isSelect : Boolean
In your selectAll() method update adpter list and notify adapter.
Edit:
in the adapter class.
if (approve.isSelect){
holder.checkBox.setChecked(true)
} else {
holder.checkBox.setChecked(false)
}
Hope this may help you.
OR
If you are using AndroidX then use should use one recyclerview features.
androidx.recyclerview.selection
A RecyclerView addon library providing support for item selection. The
library provides support for both touch and mouse driven selection.
Developers retain control over the visual representation, and the
policies controlling selection behavior (like which items are eligible
for selection, and how many items can be selected.)
Reference from here