BaseRecyclerViewAdapter | BaseRecyclerViewAdapter

I am getting exception:

I am trying to create a form that has a recyclerView for address and above the RecyclerView there is a Button which onClick able to add more address fields inside this RecyclerView but not able to do that instead when the button has clicked the app crashed. Here is the Log output I got

Process: com.fitness.client, PID: 101621

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean androidx.recyclerview.widget.RecyclerView$ViewHolder.shouldIgnore()' on a null object reference at androidx.recyclerview.widget.RecyclerView$LayoutManager.removeAndRecycleAllViews(RecyclerView.java:10079) at androidx.recyclerview.widget.RecyclerView.removeAndRecycleViews(RecyclerView.java:1174) at androidx.recyclerview.widget.RecyclerView.setAdapterInternal(RecyclerView.java:1197) at androidx.recyclerview.widget.RecyclerView.setAdapter(RecyclerView.java:1156) at com.fitness.client.ui.main.fragments.listing.ListingFragment$1.onClick(ListingFragment.java:144) at android.view.View.performClick(View.java:6608) at android.view.View.performClickInternal(View.java:6585) at android.view.View.access$3100(View.java:785) at android.view.View$PerformClick.run(View.java:25921) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:201)

And here is the code of my fragment

AND btw the BUTTON name is "address"

I'm trying to create a BaseRecyclerViewAdapter:RecyclerView.Adapter class to provide a default/common functionality for classes using generics. Because of the difference in view models' the onBindViewHolder and onCreateViewHolder methods throw NotImplementedError on the base class. Now when I want to implement the methods in the classes which inherit BaseRecyclerViewAdapter, I encounter the following error:

I'm using Realm's rxjava binding toFlowable to be notified when items are updated. I have to do this in the UI Thread to get update notification from realm. on the other hand I need to make the results unmanaged to pass them between threads and avoid inconsistency.

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 inconsistency detected exception. I think the problem lies within the getItemCount() method but I'm not sure. If someone could give me an advise it would be very helpful. Here is the code I'm using.

This is my DiffUtil Adapter Class:

I have multiple fragments which are inside activities. I have called myAdapter in fragment onActivityCreate method.

I have read too many articles for realm performance improvements, adapter management, realm usage. I open the realm in resume and close it in pause. But sometimes my realm adapter has shown empty.When I've deleted closeRealm method, my adapter was running normally.

My error is because of overlapping openRealm and closeRealm from different adapters.

First adapter is opening -> openRealm--onCreate (time : 21:15) closing->closeRealm--onPause (time : 21:30:12)

Second adapter is opening -> openRealm--onCreate (time: 21:30:23) :: Above adapter is closing this realm

https://realm.io/docs/java/latest/#configuring-a-realm : It is important to note that Realm instances are thread singletons, meaning that the static constructor will return the same instance in response to all calls from a given thread.

I can manage realm for realm thread but can't manage ui thread. How can I create a different realm instance at the same time for ui thread? Please help me.

Realm adapter:

In my android project, I created Generic RecyclerView's Adapter class & Viewholder class like below,

Adapter class,

My current realm version : 4.3.3 , realm-adapter version : 2.1.1 (latest versions)

I used OrderedRealmCollectionChangeListener as the Realm documentation : https://realm.io/docs/java/latest/#notifications

But OrderedRealmCollectionChangeListener is not triggered to when only first element is added to adapter until adapter is refreshing. I couldn't find where I made the mistake.

Please help me.

MyAdapter:

i am working on one project in which i have used open source code, but at one point i am stuck, in this code i am using RecyclerView in which onRecycleItemClickListener is already implemented but now i need to implement onItemLongClickListener in existing code