RecyclerView-Adapter | Simplify creation of RecyclerView adapters & ViewHolders | Android library
kandi X-RAY | RecyclerView-Adapter Summary
kandi X-RAY | RecyclerView-Adapter Summary
This library is designed to help separate the creation and binding of views being adapted by a RecyclerView Adapter, from the Adapter itself. Instead of writing an Adapter that needs to know which layout resource(s) to inflate for the items, as well as binding logic and click listeners, this library allows you to write a ViewModel class which wraps your data model, defining how the view should be created, bound, how many spans it should take up, etc. You no longer need to write a RecyclerView Adapter class at all.
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Top functions reviewed by kandi - BETA
- Called when the activity is resume
- Returns the view associated with this widget
- Binds the view to the view
- Gets a list of all crypto currencies
- Initializes the activity
- Gets the app component
- Binds the text to the view
- Binds this view to its view
- Compares this object to another
- Compare this currency to another currency
- Called when a child view is attached to a window
- Called when a child view is detached from a window
- Display loading
- Adds a single item to the dataset
- Unbind the presenter
- Create the view holder for the SubheaderView
- Creates a ViewHolder for the given view type
- Binds the title to the view
- Returns the span size for a given position
- Adds a list of items to the dataset
- Move an item from position to position
- Compares this SubheaderView with the given value
- Provide interceptor for HTTP logging
- Provide the OkHttpClient implementation
- Returns the section name of a section
- Initialize the Dagger component
RecyclerView-Adapter Key Features
RecyclerView-Adapter Examples and Code Snippets
Lines of Code : 46License : Permissive (Apache-2.0)
Copy// First generic type param is the model, second is the ViewHolder
public class ItemViewModel extends BaseViewModel
// Our 'model'
String text;
// Constructor - force ourselves to pass our model in.
public ItemViewModel(String text) List items = new ArrayList<>();
items.add(headerViewModel);
items.addAll(myItemViewModels);
items.add(footerViewModel);
viewModelAdapter.setItems(items);
Community Discussions
Trending Discussions on RecyclerView-Adapter
QUESTION
Hello this is my first question on stackoverflow. I have seen this question, but none of their solutions really helped me.
How to update RecyclerView Adapter Data?
My problem is, that I want to remove the view holder and not recycle it. When pressing the delete button, the viewholder is not deleted but recycled, which means that the counter is not reinstantiated with "1", but with the old value. For example if I delete the first item with a counter of 7, and add a new item into the empty recycler view, then the counter is initialized with 7 instead of 1.
When deleting a viewholder with
items.remove(position); notifyItemRemoved(position);I must usenotifyItemRangeChanged(position, items.size());, because position is not updated. For Example: When deleting the first element, the first element of the recyclerview with position 0 is deleted. When deleting the first item of the recyclerview once again, the second item is deleted at position 1. So I have to usenotifyItemRangeChanged(position, items.size());. But is there any cleaner way of notifying my adapter about the correct positions of the items in the recycler view?
public class ItemsRecViewAdapter extends RecyclerView.Adapter {
...ANSWER
Answered 2021-Mar-14 at 15:40ViewHolders are not suitable for storing any data because they are volatile and re-used between different items. Trying to "remove" viewholder is twisted way of trying to fix bad implementation.
You should either have counter as field in your Item that you can modify or hold an array of counters you can match with your items. Then you need to use that data during onBindViewHolder. There's no need to call notifyDatasetChanged after altering one field either because you're not altering the structure of your list.
You're also making mistake of storing hard reference to position argument in your listeners - you should be using holder.getBindingAdapterPosition() instead which returns current item position so you won't need to notify item range changed anymore - and you won't need to instantiate them every time you bind viewholder either, they can be created only once in that case.
This is how you can clean up the adapter by adding counter field to your Item:
QUESTION
I'm getting E/RecyclerView: No adapter attached; skipping layout all the time.
Gave my best on my own, but didn't seem to get it fixed.
Browsing here for a while and found some similar problems, but I don't know what to change in my specific
case.
If you need more info feel free to ask.
ANSWER
Answered 2020-Jul-23 at 17:50Try this code, call your adapter in OnCreateView.
QUESTION
I'm following this tutorial to implement a Room database. Everything is the same except mine is on a Fragment. There are no errors and the RecyclerView cards aren't visible at all. (I'm still able to add cards dynamically when not using a RecyclerView)
I've already tried this on an Activity and it still doesn't work so I must have missed something as I'm not copying the entire code from the tutorial. Maybe it's something simple because I'm new to Android.
Adapter:
...ANSWER
Answered 2020-Jul-22 at 18:35Suggestion
Learn to debug your code and pinpoint your error. Most of the errors I get I solve them by debugging. If you don't know what debugging is or how to do it you can google it. It's really simple and it can save you hours of problem solving and it saves you the question altogether.
I'm suggesting this because from what you've described, the first thing I'd check is that if my RecyclerView is receiving anything at all. I would do this by setting a debug breakpoint inside the getItemCount method of my RecyclerView. If the value returned is bigger than 0 it means that's OK.
Then I'd proceed to check other steps of my code and this way you can actually see what's wrong and it's very useful to get a better understanding of what's going and how things work.
This way you can pinpoint your error and ask a more specific question. Instead of quoting your entire code, you could quote just a method or just one line.
EDIT
Great to hear that the problem is within the list. Now I see that you're having a problem with it in the first lines of your adapter. You're creating a new empty list when you do
private List cartItems = new ArrayList<>();
Maybe you can consider adding a parameter to the adapter such as
QUESTION
So I did tons of research regarding memory leaks in android and have read many StackOverflow posts. What I still don't understand is that according to Medium and StackOverflow posts (links mentioned below), If I pass my activity's context to an adaptor for Recyclerview and store it as a global variable in the adaptor, my activity along with the adaptor is still eligible for garbage collection. This is explained due to the fact that no GC roots have a reference to the adaptor or my activity (once it's destroyed) and so both will be garbage collected (Example1). However, why isn't the same case applied for inner classes? I get that they hold an implicit reference to their holding class, but if the activity (holding class in this case) gets destroyed and even if inner class is still executing some Async Task, shouldn't there be no GC roots pointing to any of them? (holding or the inner class) so both of them should get Garbage Collected? (Example 2).
Example1: (eligible for GC after activity gets destroyed):
...ANSWER
Answered 2020-May-13 at 11:17Assuming that the AsyncTask has a reference to your inner class, then:
If an inner class of an Activity is running an AsyncTask, even if the Activity is finished, the GC will not be able to reclaim the Activity because the inner class has a reference to the Activity and the AsyncTask has a reference to the inner class and Android's internal thread manager has a reference to the AsyncTask. However, once the AsyncTask completes, the GC can reclaim the Activity since the internal thread manager will no longer have a reference to the AsyncTask.
This isn't really a memory leak, as it is only a temporary situation. The Activity will eventually be reclaimed. Real "memory leaks" occur when an object can never be reclaimed by the GC. Eventually such memory leaks can consume all available memory and cause a long-running application to crash with an OutOfMemoryException.
You can prevent this by cancelling your AsyncTask inside onDestroy() of the Activity.
Hopefully this answers your question.
QUESTION
I would like to use the new View Binding instead of ButterKnife in my RecyclerView Adapter class?
This is my class :
ANSWER
Answered 2020-Mar-23 at 10:35Your ViewHolder expects View instance to be passed. So, just pass binding.getRoot() instead of binding into the constructor, and it will work.
Like this:
QUESTION
I am implementing Two-Way DataBinding with Android Architecture Components using LiveData and ViewModel, but when I build the project it gives
ANSWER
Answered 2019-Mar-26 at 18:47You can use getter of particular variable directly using get() method to variable (also works for setter too as set(value)) like below :
QUESTION
I keep getting IndexOutofBoundsException from my onBind method in search adapter as soon as I start to search /filter my recyclerview list results. Here's the exception :
...ANSWER
Answered 2019-Oct-28 at 18:23The stack trace above, seems like doesn't related on your code implicitly. And issue caused by internal RecyclerView implementation of animations. Also described here.
1) Possible workarounds for it, just clearing active ViewHolders pool, which could be pending on animation. And could throw IndexOfBoundException. Call below methods, before any notifyDataSetChanged.
QUESTION
I am a beginner in Kotlin android development and not able to call a fragment function from adapter. Following this approach, I wrote below code but still no luck.
Adapter code
...ANSWER
Answered 2019-Dec-21 at 07:04You should:
QUESTION
I tried to make a RecyclerView that will go inside one of the two pages of my fragments. These pages are put inside a NavigationDrawer activity. The goal is to create something like the Play Store app homepage.
But I found an error in this snippet of code on runtime. It says:
...ANSWER
Answered 2018-Jan-26 at 10:02You forgot to initialize your mainMenu inside onCreate of MainFragment.kt
QUESTION
I am trying to use onActivityResult in my RecyclerViewAdapter. But I get the error that the 'The method does not override from its superclass'. I tried implementing the interface but onActivityResult never gets called. I have already searched enough on the StackOverflow questions like this one but couldn't find anything helpful.
RecyclerViewAdapter.java
...ANSWER
Answered 2018-Jul-07 at 13:43You have to override onActivityResult in your activity wich contains the recyclerview not in viewholder class
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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No vulnerabilities reported
Install RecyclerView-Adapter
You can use RecyclerView-Adapter like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the RecyclerView-Adapter component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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