GroupAdapter | specialized RecyclerView.Adapter that presents data | RecyclerView library

First, my question is same with this. But my code is different, and I try to follow this but not solve my problem.

So my question is, I would like to have this:

• Header 1
  • Child header 1
  • Child header 1
  • Child header 1
• Header 2
  • Child header 2
  • Child header 2

I have this instead:

• Header 1
  • Child header 1
  • Child header 1
  • Child header 1
  • Child header 2
  • Child header 2
• header 2
  • Child header 1
  • Child header 1
  • Child header 1
  • Child header 2
  • Child header 2

This is my code for ParentItemAdapter

I'm still trying to wrap my head around working with viewmodels and a bit confused now that I also have a dialog and recyclerview items but will try to be as clear as I can here if I can get any help please.

I have a dialog with items that when one of them is selected and closed should return data to my calling fragment so the selected item is displayed under that view.

However, once the item is selected and the dialog dismissed, I don't see the new selected item as the one showing on the UI but still the old item instead. (When the fragment is first started it displays the item that is set as selected on my list. The selected value is hardcoded at first but updated when the item is clicked and I can see the update has taken place when I debug the viewmodel observer inside the onDismiss method for the dialog).

I'm a couple of hours on this and have tried a few different things such as calling the viewmodel inside onResume or onDismiss and changing the viewmodel to be initiated by by activityViewModels() as per this post but none of these have worked so far and I think I'm stuck at the moment. Below my most recent version of the code.

I see this question asked a few times but maybe because I'm using the Groupie library for adding items to my adapter, I'm not being able to unselect the other items when one of the them is selected (similar to radio button functionality). I'm trying to notify the adapter of changes and somewhat get the position of the item selected but I think I may still be missing something if someone could point this out for me please.

I have a RecyclerView implemented with the Groupie library and I can delete an item from the list fine, however need to update the view to see the change. I'd like to have something like notifyDataSetChanged() instead, so the list updates immediately. I'm a bit confused at this stage though, tried a few different ways to get an interface from the class that hosts my view holder to be triggered from the fragment that holds the adapter but I think I'm stuck now if I could get some help please.

hope you're doing well. I'm developing an android with fragment use and I have some problems. I implement a recycler view in a fragment layout an I initialize it. But when I run the code, the logcat show this error: java.lang.IllegalStateException: recyclerview_latestmessage must not be null The id of the recycler view is : recyclerview_latestmessage I use a bundle call groupie to replace the RecyclerView adapter. You can find more information here: https://github.com/lisawray/groupie#groupie

Here is my code.

fragment_chat.xml

I have an activity that I want to have created when a button is clicked. For some reason android creates this activity, then destory it, and then create it again at once. I used log messages to debug the creating and destroying(onCreate message and onDestroy message):

"2020-05-21 08:48:19.358 28554-28554/com.example.amigo D/TAG: Standings has been created

2020-05-21 08:48:19.400 28554-28554/com.example.amigo D/TAG: Standings has been destroyed.

2020-05-21 08:48:19.639 28554-28554/com.example.amigo D/TAG: Standings has been created "

Why does it create it again instead of not destroying it in the first place?

Code of starting the activity:

I have been programming a small Chat Application and have come across the following error

Type Mismatch Required Boolean Found Class

I am trying to use Groupie to create a recyclerview with HeaderItems. I have Group of Data like this

I am trying to show a list of user in recyclerView and trying to connect the textview layout in bind method in groupie library and i don't know how to link the id of layout to recyclerview viewHolder? and also how to use picasso library in viewholder?