Develop Reference

DiffUtil Not working with ListAdpater when view is updating Android Kotlin

Hey I have Reyclerview with DiffUtill using ListAdapter. I added element through submitList function. But when updating the list view is not redrawing the element. Until I used notifyDataSetChanged() or setting adapter again. So what the use case of DiffUtill?. What is the proper way of doing to redraw item when item is updated in list as well as in reyclerview.
MainActivity
class MainActivity : AppCompatActivity() {
private var list = mutableListOf(1, 2, 3, 4, 5, 6, 7, 8, 9)
private lateinit var binding: ActivityMainBinding
var i = 0
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
Log.e("List", " $list")
val intAdapter = IntAdapter()
binding.recylerview.adapter = intAdapter
intAdapter.submitList(list)
binding.button.setOnClickListener {
list.add(++i)
intAdapter.submitList(list)
// binding.recylerview.adapter = intAdapter
// intAdapter.notifyDataSetChanged()
}
}
}
IntAdapter
class IntAdapter : ListAdapter<Int, IntViewHolder>(comparator) {
companion object {
private val comparator = object : DiffUtil.ItemCallback<Int>() {
override fun areItemsTheSame(oldItem: Int, newItem: Int): Boolean {
return oldItem == newItem
}
override fun areContentsTheSame(oldItem: Int, newItem: Int): Boolean {
return oldItem == newItem
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): IntViewHolder {
return IntViewHolder(
IntLayoutBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
)
)
}
override fun onBindViewHolder(holder: IntViewHolder, position: Int) {
holder.bindItem(getItem(position))
}
}
IntViewHolder
class IntViewHolder(val binding: IntLayoutBinding) : RecyclerView.ViewHolder(binding.root) {
fun bindItem(item: Int?) {
binding.intNumber.text = item.toString()
}
}
activity_main.xml
<?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"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recylerview"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="add"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
int_layout.xml
<?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"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/intNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

You need to ensure you pass a different instance of List each time you call submitList. If you pass a List, mutate it, and then pass that same List instance again, DiffUtil is only comparing the same list to itself, so it will assume nothing has changed in the list and won't update anything. It doesn't have some sort of memory of what the List contained back when you first submitted it.
To generalize further, you must not use a mutable List with ListAdapter at all. ListAdapter assumes the list you pass to submitList does not change. If you mutate it, there can be unexpected bugs.
Two ways to resolve this in your code.
Create a read-only copy of the list each time you pass it:
intAdapter.submitList(list.toList())
Don't use a MutableList at all. Create a new List every time you modify what should be in the List. This is the simpler, less error-prone solution.
class MainActivity : AppCompatActivity() {
private var list = listOf(1, 2, 3, 4, 5, 6, 7, 8, 9)
private lateinit var binding: ActivityMainBinding
var i = 0
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
Log.e("List", " $list")
val intAdapter = IntAdapter()
binding.recylerview.adapter = intAdapter
intAdapter.submitList(list)
binding.button.setOnClickListener {
list += ++i // create a new list from old list contents plus a new item
intAdapter.submitList(list)
}
}
}
Side note: when you have var combined with Mutable____ that should be kind of a red flag. It should be rare that you need two different ways to change something. That is error-prone.

You need to submit a new List, currently you are submitting that same List which has been mutated.
Inside your click listener try something like :
binding.button.setOnClickListener {
val current = intAdapter.currentList
val update = current + (current.size + 1) // returns a new list with added value
intAdapter.submitList(update)
}
Example with this logic :

Creating recycler view item animation

I am trying to creating a animation in a recyclerview. The kind of animation that I am looking for is the one which is available in Telegram android app.
When you open a chat in telegram and long press on the message, the recyclerview multi select option comes with checkbox. I am trying to create the same effect.
My current status:
ListItemAdapter.kt
class ListItemAdapter(private val values: List<PlaceholderContent.PlaceholderItem>
) : RecyclerView.Adapter<ListItemAdapter.ItemViewHolder>() {
private lateinit var itemClick: OnItemClick
private var selectedIndex: Int = -1
private var selectedItems: SparseBooleanArray = SparseBooleanArray()
private var isActive: Boolean = false
fun setItemClick(itemClick: OnItemClick) {
this.itemClick = itemClick
}
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): ListItemAdapter.ItemViewHolder {
val view = LayoutInflater.from(parent.context).inflate(
R.layout.fragment_item,
parent,
false
)
return ItemViewHolder(view)
}
override fun onBindViewHolder(holder: ListItemAdapter.ItemViewHolder, position: Int) {
holder.itemView.apply {
findViewById<TextView>(R.id.item_number).text = values[position].id
findViewById<TextView>(R.id.content).text = values[position].content
}
holder.itemView.setOnClickListener {
itemClick.onItemClick(values[position], position)
}
holder.itemView.setOnLongClickListener {
itemClick.onLongPress(values[position], position)
true
}
toggleIcon(holder, position)
}
override fun getItemCount(): Int {
return values.size
}
fun toggleIcon(holder: ItemViewHolder, position: Int){
val checkBox = holder.itemView.findViewById<RadioButton>(R.id.is_selected)
if(selectedItems.get(position, false)){
checkBox.isGone = false
checkBox.isChecked = true
}
else{
checkBox.isGone = true
checkBox.isChecked = false
}
if(isActive) checkBox.isGone = false
if(selectedIndex == position) selectedIndex = - 1
}
fun selectedItemCount() = selectedItems.size()
fun toggleSelection(position: Int){
selectedIndex = position
if (selectedItems.get(position, false)){
selectedItems.delete(position)
}else {
selectedItems.put(position, true)
}
notifyItemChanged(position)
isActive = selectedItems.isNotEmpty()
notifyDataSetChanged()
}
fun clearSelection(){
selectedItems.clear()
notifyDataSetChanged()
}
interface OnItemClick {
fun onItemClick(item: PlaceholderContent.PlaceholderItem, position: Int)
fun onLongPress(item: PlaceholderContent.PlaceholderItem, position: Int)
}
inner class ItemViewHolder(itemView: View): RecyclerView.ViewHolder(itemView){
}
}
fragment_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="#+id/list_item"
>
<RadioButton
android:id="#+id/is_selected"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:layout_margin="16dp"
/>
<TextView
android:id="#+id/item_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/text_margin"
android:textAppearance="?attr/textAppearanceListItem" />
<TextView
android:id="#+id/content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/text_margin"
android:textAppearance="?attr/textAppearanceListItem" />
</LinearLayout>
MainActivity.kt
adapter = ListItemAdapter(PlaceholderContent.ITEMS)
val recyclerViewList = view.findViewById<RecyclerView>(R.id.list)
recyclerViewList.adapter = adapter
recyclerViewList.layoutManager = LinearLayoutManager(view.context, LinearLayoutManager.VERTICAL, false)
val myHelper = ItemTouchHelper(myCallback)
myHelper.attachToRecyclerView(recyclerViewList)
adapter.setItemClick(object : ListItemAdapter.OnItemClick{
override fun onItemClick(
item: PlaceholderContent.PlaceholderItem,
position: Int
) {
if(adapter.selectedItemCount() > 0)
toggleSelection(position)
}
override fun onLongPress(
item: PlaceholderContent.PlaceholderItem,
position: Int
) {
toggleSelection(position)
}
})
return view
}
private fun toggleSelection(position: Int){
adapter.toggleSelection(position)
}

To add an animated transition, the simplest way is by adding
animateLayoutChanges="true"
to the individual item root(since that's where you'd like it animated), which in your case would be:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="#+id/list_item"
animateLayoutChanges="true" <!-- Around here -->
>
...
</LinearLayout>
To have it look exactly like in telegram, you'd need a bit of a different design to start with, but that's another issue(and a matter of perseverance in a way :P);
Also if you'd like different types of animations, you'd need to go at it with a different way, you could do it by adding animate to the view: ( alpha goes from 0f to 1f usually((invisible-visible)), and you'd need to change the view visibility paremeter if needed to visible/invisible/gone so that it doesn't register click events on that area, depending on your needs. In any case, this should be trial & error to get your desired behavior)
is_selected.animate().alpha(1f).setInterpolator(AccelerateDecelerateInterpolator())
is_selected.visibility = View.VISIBLE
You could also read up a little on available android interpolators, since we can't be quite sure whether they will remove some(unlikely)/add new ones.

How to stop a view in RecyclerView from updating its value when it has focus?

I have a RecyclerView with a set of CardView that contain an EditText in each card. The RecyclerView adapter receives a list of numbers every second and it binds the data to each CardView's EditText.
However, when the user click on one of the EditView I want that EditView to stop changing every second while the EditView has the focus, so the user can enter their own data.
I don't really know what to do if (editView.hasFocus)
Adapter
class ConverterRecyclerViewAdapter(val ratesList: ArrayList<Currency>,
val context: Context?,
val onRateListener: OnRateListener)
: RecyclerView.Adapter<ConverterRecyclerViewAdapter.ViewHolder>() {
class ViewHolder(itemView: View, val onRateListener: OnRateListener) : RecyclerView.ViewHolder(itemView), View.OnClickListener{
var editText: EditText
init{
itemView.setOnClickListener(this)
editText = itemView.findViewById(R.id.value_conv_cv)
}
fun bindItem(currency : Currency){
itemView.currency_name_conv_cv.text = currency.currencyName
itemView.country_currency_name_conv_cv.text = currency.countryCurrencyName
itemView.value_conv_cv.text = SpannableStringBuilder(currency.value.toString())
itemView.flag_iv_conv_cv.setImageResource(currency.flag)
itemView.tag = currency.currencyName
}
override fun onClick(v: View?) {
onRateListener.onRateClick(adapterPosition, itemView.currency_name_conv_cv.text.toString())
}
}
interface OnRateListener {
fun onRateClick(position : Int, currency : String)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val view = LayoutInflater.from(parent.context)
.inflate(R.layout.converter_card_layout, parent, false)
return ViewHolder(view, onRateListener)
}
override fun getItemCount(): Int {
return ratesList.size
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.bindItem(ratesList[position])
}
}
CardView.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardElevation="0dp"
app:cardUseCompatPadding="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="16dp">
<ImageView
android:id="#+id/flag_iv_conv_cv"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="#mipmap/ic_launcher_round"/>
<TextView
android:id="#+id/currency_name_conv_cv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CURRENCY"
android:textStyle="bold"
android:textSize="16sp"
android:paddingTop="#dimen/list_item_tv_padding"
android:paddingStart="#dimen/list_item_tv_padding"
android:layout_toRightOf="#id/flag_iv_conv_cv"
android:layout_toEndOf="#+id/flag_iv_conv_cv"
android:textColor="#android:color/black"/>
<TextView
android:id="#+id/country_currency_name_conv_cv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/flag_iv_conv_cv"
android:layout_toEndOf="#+id/flag_iv_conv_cv"
android:layout_below="#+id/currency_name_conv_cv"
android:paddingStart="#dimen/list_item_tv_padding"
android:text="Country Currency Name"
android:textSize="12sp"
android:textColor="#android:color/darker_gray"/>
<EditText
android:id="#+id/value_conv_cv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignEnd="#id/country_currency_name_conv_cv"
android:gravity="right"
android:text="100"
android:textSize="24sp" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
Fragment
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
viewModel = ViewModelProvider(this).get(ConverterViewModel::class.java)
viewModel.initialisePositions()
viewModel.setupTimer(viewModel.ratesPositions[0])
val ratesLiveData = viewModel.rates
ratesLiveData.observe(viewLifecycleOwner, Observer { data ->
refreshData(data.rates)
viewModel.sortListByPositionsArray(ratesArray)
val firstElementInRecyclerView = viewModel.ratesPositions[0]
val view = recyclerView.findViewWithTag<View>(firstElementInRecyclerView)
lateinit var editText : EditText
if (converterAdapter == null) setUpRecyclerView()
else {
converterAdapter!!.notifyDataSetChanged()
}
})
}

First of all, you want to update your item when you don't have the focus on it, so indeed you have to use if (!editView.hasFocus()) {}
Then if you have to check if your list ratesArray is holding the same items or not, because if you do ratesArray.clear() at some point, you're clearing the objects then the RecyclerView will create a new ViewHolder for your item.
If you are clearing and creating new objects continuously, you have to "pair" your Adapter with the items.
For example, if you always clear the items and create them again respecting the position, add this method to your Adapter:
override fun getItemId(position: Int): Long {
return position.toLong()
}
you can relate the "rate" in any other ways (a String inside the object, for example). If you do it with the position, you're pairing each item with their order.
Now, to finish "respecting that order", you have to tell the adapter that it has stable ids. That's done with Adapter.setHasStableIds(true)

Maybe like this:
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
if(!holder.editText.hasFocus()){
holder.bindItem(ratesList[position])
}
}
UPDATE
remove the focusable attribute for edittext and add this to its xml
android:focusableInTouchMode="false"
in the adapter:
//decalare clicked item as member of the class and set it to -1
var clickedItem = -1;
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
if(clickedItem != position){
holder.bindItem(ratesList[position])
}
//on click
holder.editText.setOnClickListener {
clickedItem = position;
notifyDataSetChanged();
}
}

Your EditText needs special binding so remove this line from fun bindItem():
itemView.value_conv_cv.text = SpannableStringBuilder(currency.value.toString())
And on onBindViewHolder, bind this view only when it's not focused, which requires listening. Try this:
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val current = ratesList[position]
holder.bindItem(current)
holder.value_conv_cv.setOnFocusChangeListener { view, hasFocus ->
if (hasFocus) {
// do nothing
} else {
holder.value_conv_cv.text = SpannableStringBuilder(current.value.toString())
}
}
}

Why my pagedList is not updated via LiveData method .observe?

I have a Dao with this method.
#Query("SELECT * FROM expense WHERE date BETWEEN :dateStart AND :dateEnd")
fun getExpensesBetweenTheDate(dateStart: Calendar, dateEnd: Calendar):
DataSource.Factory<Int, Expense>
My repository get Dao and create LiveData> object.
fun getExpensesBetweenTheDate(startDay: Calendar, endDay: Calendar): LiveData<PagedList<Expense>> {
val factory = expenseDao.getExpensesBetweenTheDate(startDay, endDay)
val config = PagedList.Config.Builder()
.setPageSize(30)
.setMaxSize(200)
.setEnablePlaceholders(true)
.build()
return LivePagedListBuilder(factory, config)
.build()
}
My ViewModel get repository and create a variable.
val expenses = repository.getExpensesBetweenTheDate(startCalendar, endCalendar)
Finally, MainActivity observes on LiveData.
viewModel.expenses.observe(this, Observer(simpleExpenseAdapter::submitList))
All working fine, but when I try to add a new record to the database, it appears there not immediately, but after restarting the application. Similar code without a paging library works well. Maybe i do something wrong. Just in case, I give below the code of the adapter, viewHolder and layout.
Adapter.
class ExpenseAdapter : PagedListAdapter<Expense, ExpenseViewHolder>(EXPENSE_COMPARATOR) {
companion object {
private val EXPENSE_COMPARATOR = object : DiffUtil.ItemCallback<Expense>() {
override fun areItemsTheSame(oldItem: Expense, newItem: Expense): Boolean {
return oldItem.expenseId == newItem.expenseId
}
override fun areContentsTheSame(oldItem: Expense, newItem: Expense): Boolean {
return oldItem == newItem
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ExpenseViewHolder {
return ExpenseViewHolder.create(parent)
}
override fun onBindViewHolder(holder: ExpenseViewHolder, position: Int) {
val expenseItem = getItem(position)
if (expenseItem != null) holder.bind(expenseItem)
}
}
ViewHolder.
class ExpenseViewHolder(binding: ExpenseElementSimpleBinding) : RecyclerView.ViewHolder(binding.root) {
private val mBinding = binding
init {
mBinding.root.setOnClickListener {
val intent = Intent(it.context, ShowExpenseActivity::class.java)
intent.putExtra("expense", mBinding.expense)
it.context.startActivity(intent)
}
}
companion object {
fun create(parent: ViewGroup): ExpenseViewHolder {
val inflater = LayoutInflater.from(parent.context)
val binding = ExpenseElementSimpleBinding.inflate(inflater, parent, false)
return ExpenseViewHolder(binding)
}
}
fun bind(item: Expense) {
mBinding.apply {
expense = item
executePendingBindings()
}
}
}
Layout.
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="expense"
type="com.example.budgetplanning.data.model.Expense"/>
</data>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.appcompat.widget.AppCompatTextView
android:text="#{expense.description}"
tools:text="Gasoline"
android:padding="5dp"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"/>
<androidx.appcompat.widget.AppCompatTextView
android:text="#{String.valueOf(expense.amount)}"
tools:text="123"
android:padding="5dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</layout>

You have to call the simpleExpenseAdapter.notifyDataSetChanged() after the the submitList
This is happening because when you are calling simpleExpenseAdapter::submitList is equivalent to call simpleExpenseAdapter:submitList() when the list diff is not called at this time. So, you have to notify that the list has changed.
Or so, you can pass the new list as a parameter like:
viewModel.expenses.observe(this, Observer<YourObjectListened> {
simpleExpenseAdapter.submitList(it)
})

try to use toLiveData with original example from Paging library overview

Is SwipeRefreshLayout compatible with an adapter that has multiple viewType?

I am making a list, that will get more items when I go to the bottom of the list. I want this list to be refreshable too, so I need a SwipeRefreshLayout.
Let's say I have an adapter like this :
class OrdersListAdapter(val selected : (Order) -> Unit) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
fun addOrders(orders: ArrayList<Order>) {
this.orders.addAll(orders)
notifyItemRangeInserted(this.orders.size - orders.size + FIRST_ITEM_INDEX, orders.size)
}
fun setFirstOrders(orders: ArrayList<Order>) {
this.orders = orders
notifyDataSetChanged()
}
override fun getItemCount(): Int {
return (orders.size + 1 + FIRST_ITEM_INDEX)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
return when (viewType) {
TYPE_ORDERS -> OrdersViewHolder(DataBindingUtil.inflate<OrdersItemBinding>(LayoutInflater.from(parent.context),
R.layout.orders_item, parent, false).apply {
viewModel = OrdersViewModel()
})
else -> LoadingMoreOrdersViewHolder(DataBindingUtil.inflate<LoadingMoreOrdersItemBinding>(LayoutInflater.from(parent.context),
R.layout.loading_more_orders_item, parent, false).apply {
viewModel = LoadingMoreOrdersViewModel()
})
}
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
when (getItemViewType(position)) {
TYPE_ORDERS -> (holder as? OrdersViewHolder)?.setData(orders[position - FIRST_ITEM_INDEX])
TYPE_LOADING -> (holder as? LoadingMoreOrdersViewHolder)?.setState(loading, error, noMoreItems)
}
}
override fun getItemViewType(position: Int): Int =
if (position == FIRST_ITEM_INDEX - 1) TYPE_HEADER else if (position == itemCount - 1) TYPE_LOADING else TYPE_ORDERS
Well if I put my RecyclerView like this, inside a SwipeRefreshLayout :
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/refresh_layout"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar">
<android.support.v7.widget.RecyclerView
android:id="#+id/orders_rv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="android.support.v7.widget.LinearLayoutManager" />
</android.support.v4.widget.SwipeRefreshLayout>
This will display all items, but the refreshLayout will not work : If I pull my view, nothing happens.
But if I do not set any loading layout inside my adapter (the one at bottom of the list, to load more items, inflated from R.layout.loading_more_orders_item), then the SwipeRefreshLayout will work properly.
How can I have 2 view types in my adapter, AND set my RecyclerView in a SwipeRefreshLayout ?
EDIT :
Here is my onRefreshListener :
refreshLayout = binding.swipeRefreshLayout
refreshLayout?.setOnRefreshListener { reloadOrders() }
And in reloadOrders() :
private fun reloadOrders() {
viewModel.setLoading()
refreshLayout?.isRefreshing = false
Observable.timer(1, TimeUnit.SECONDS)
.subscribe { getOrders() }
}

I believe that what happens is the recyclerview takes over the ontouch events from swiperefreshlayout. You could try overwriting linearlayout and its canScrollVertically() method to return false. Cheers!

Answering your question, compatibility is not the issue you're having. Not sure of the size of your layout, as its height is 0dp. I'd play around with the view sizes and view hierarchy.

Okay so thanks to #r2rek, I found a solution that worked for me :
In the code, we create a class that extends LinearLayoutManager and overrides method canScrollVertically() to always return false :
inner class MyLinearLayout(context: Context) : LinearLayoutManager(context) {
override fun canScrollVertically(): Boolean {
return (false)
}
}
Then, when we init our RecyclerView, we apply this class to our layoutManager :
ordersRv?.layoutManager = MyLinearLayout(this)
This will allow you to refresh, however you will not be able to scroll in your RecyclerView (duh).
To fix this, add a NestedScrollView in your xml, as following :
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/refresh_layout"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:visibility="#{viewModel.ordersVisibility}"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/toolbar">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/orders_rv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.NestedScrollView>
</android.support.v4.widget.SwipeRefreshLayout>
You can now scroll in your RecyclerView, and pull to refresh with your SwipeRefreshLayout.
I think this method is kinda hacky, so if someone have a better solution, feel free to tell us !