Questions related to Android DiffUtil utility class for calculating difference between two lists
Questions tagged [android-diffutils]
180 questions
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How to write DiffUtil.Callback correctly so that the recyclerview does move animations?
I have a recyclerview adapter of plain old data type, char in my case.
The adapter is backed by a list.
The setChar method updates the list.
Assume in my case that setChar is only called with the same list as the adapter has but only with items…
Daniel
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LiveData, DiffUtil and object references
There is LiveData which is a list of users:
val users: MutableLiveData>
Then it is updated:
val usersValues = users.getValues()
val user = usersValues[0]
user.name = "new-name"
users.post(usersValues)
And DiffUtil doesn't see different…
eleven
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Android DiffUtil :: onBindViewHolder returning the position removed from the list
I am trying to remove Items from adapter when Item is clicked
The display is doing the right thing
but when I click the last item, I get IndexOutOfBound Exception
my diff utils the below
class ItemListDiffUtilCallBack(val oldList: List,
…
Anthony
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Do I really need a DiffUtil.ItemCallback to update my RecyclerView if its adapter uses reference to a MutableListView managed by a separate class?
Let's say I have an adapter for a RecyclerView that looks like this:
class ContentAdapter(
private val data: List,
private val itemSelectedListener: OnItemSelected,
private val activityUIFocusListener:…
Gensoukyou1337
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2 answers
Android RecyclerView Compare the data and update ui acording to it
Hello I am New to Programming i just created an application that get the data from server every second i just wants to changethe background of my RecyclerViews holder's bid and ask position if the data if grater or lower then previous.
for example…
user12575366
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2 answers
Firebase Realtime Database, ListAdapter, DiffUtil and ViewModel
I am trying to create a list view using Recycler View and display a list. Lets say what I am trying to display is like a typical chat screen - image, message, sender_name etc.
So all this data is stored in Firebase Realtime Database. I am also using…
srinij
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View Changes not properly
Ok from the Start, I have a RecyclerView where I want to change the color of the entries, if they are clicked.
The Recyclerview gets a list from a database, where I added a bool value, if the View is selected.
In my holder I check if the view is…
Simon
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- 1
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Submit the same list using AsyncListDiffer, but the recycler view always auto scroll to top
I try to submit the same list using AsyncListDiffer, but the recycler view always auto scroll to top. When I debug I see the recyclerview auto scroll to top after calling submitList before areItemsTheSame method is called
class TestPlaceAdapter(
…
Hien Nguyen
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live data list r doesn't update with DiffUtil method
i used the google recommendations to create my recycler view with the diff utils but the diff utils doesnt update with my livedata list i have tried everything
My Model class
data class Note(
val Title:String?=null,//column 2
val…
freedom chuks
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Why Recyclerview adapter onBindViewHolder is called more than once?
I use this tutorial to implement DiffUtil in my recyclerview. My aim is to add single item to the bottom of the recyclerview without reloading the rest of the recyclerview. I used firestore addSnapshotListener to call the adapter. The problem is the…
eegooDeveloper
- 395
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0 answers
RecyclerView items disappear after restarting app
I was previously using RecyclerView Adapter and decided to switch to ListAdapter to make use of DiffUtils for the animations. Everything seem to go smoothly at first until I cleared my app from the task switcher (Memory). Once I opened my app again…
Juan Rincon
- 3
- 2
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1 answer
getItemCount or onBindViewHolder not getting called using DiffUtil
I'm updating my list when the user reaches the end of the scroll to get a pagination effect.
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
if…
Manoj Perumarath
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Can I use hashCode function of a class to verify if both has same value for areContentsTheSame in diffutils callback?
I am trying to implement RecyclerView ListAdapter with DiffUtils callback to only update/insert rows that has been changed not all. To implement I have to override these function from diff utils
areItemsTheSame and areContentsTheSame. I can check…
Shahid Kamal
- 380
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How to update images in a RecyclerView?
I have a RecyclerView of images that the user is able to edit directly in the RecyclerView itself.
The editing part is fine and works well. It's done on a bitmap that overlays the images and then saves any changes to the image file. As soon as the…
John
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0
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Android DiffUtil inconsistency exceptions when using custom added views like i.e. for empty lists
I need help with the DiffUtil for RecyclerView Adapter. I have made a Custom Adapter with the possibility to add custom Views like a loading view or empty view etc. Everything works fine without using DiffUtil but when I use it I have sometimes an…
Martin S
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