AndroidViewModel | Separating data and state handling | Android library

I want to use a ViewModel with a Databinding to disable a Checkbox when a Button is clicked, but the UI won't update unless the fragment is destroyed and recreated.

There seem to be many similar questions, but the ones that are most similar seem to all be solved by setting binding.lifecycleOwner, which I've already done.

fragment_checkbox_databinding.xml:

Hey I am working in kotlin flow in android. I noticed that my kotlin flow collectLatest is calling twice and sometimes even more. I tried this answer but it didn't work for me. I printed the log inside my collectLatest function it print the log. I am adding the code

MainActivity.kt

I am trying to get Formatting String in AndroidViewModel by using following extension function but failed:

My List doesn't seem to be getting initialised and I'm not really sure what I should be doing here, everytime I run I get:

Like title I can't get correct item data, now imagine I have 2 recycler view list on my main fragment, one recycler view is vertical, other horizontal. If I use only one recycler everything is working fine. But when I add other one it's opening items randomly, but that random data openings only random both recyclers positions. Like my first recycler have [a,b,c,d] , other recycler have [e,f,g,h]. When I click first item of first recycler its go to other fragment which shows detail, its opening e instead of a, if I go back and retry it, its opening e again, retry and its a !! so its opening randomly, why this is happening why can't I open correct data? I put Log.d on my adapters and when I click recycler items, adapters log says u clicked "a" but my detail fragment shows me data of "e". What I am doing wrong? Here is my codes:(I have lots of codes so I share what we need)

my databases TvDAO:

I am struggling to use Live data on an MVVM pattern. The app is supposed to:

1. Fetch data from an API (which it does correctly)
2. Store that data in the Live data object from the ViewModel
3. Then the fragment calls the Observer method to fill the recyclerView.

The problem comes in point 3, it does nothing, and I cannot find the solution.

Here is the relevant code. (If I'm missing something, I will try to answer as quickly as possible)

Main Activity:

I have this fragment in which I store my 'favorite items' and I can delete them when I click on a button if I want to. The implementation works well until I get to the last item and it doesn't disappear unless I go to another fragment and then come back (as in, the item is deleted but the recycler view still shows it unless I update the fragment myself).

How can I make the last item disappear right away? Setting notifyDataSetChanged() after the deleteHandler in the adapter does not seem to work.

This is the fragment where I have the items:

How to handle query method's return type room using Kotlin, Coroutines, ViewModel, LiveData

the building is failed and I'm getting lots of errors that are pointing into my Dao class and the error is

Error 1:

Not sure how to handle query method's return type (java.lang.Object). DELETE query methods must either return void or int (the number of deleted rows).

Error 2:

error: Query method parameters should either be a type that can be converted into a database column or a List / Array that contains such type. You can consider adding a Type Adapter for this. kotlin.coroutines.Continuation continuation);

Error 3:

error: Unused parameter: continuation public abstract java.lang.Object clear(@org.jetbrains.annotations.NotNull()

Error 4:

error: Type of the parameter must be a class annotated with @Entity or a collection/array of it. kotlin.coroutines.Continuation continuation);

Error 5:

error: Not sure how to handle insert method's return type. public abstract java.lang.Object insert(@org.jetbrains.annotations.NotNull()

**Here is my full code: https://drive.google.com/drive/folders/1qWoud5XogzkTmpa-GWxLJStfdUPSoV7r?usp=sharing

android kotlin - Coroutines Room ViewModel LiveData MainActivity.kt

I am creating an app where the user can log in or register for an account. I have created the register screen and it's successfully saving data into the database. However, I am now trying to integrate some validation. For example, the usernames would have to be unique and the email can't already exist.

I tried to write a custom query of-course to print out all the rows in the username column like this:

SELECT userName from cx_table

and I also tried to write a separate custom query of-course to print out all the rows in the email column like this:

SELECT email from cx_table

Then my approach was to take the user input and compare it to the values returned by that column, if it exists, print an error message. But when I run the app, I get the following error message

The columns returned by the query does not have the fields [id,firstName,lastName,password,address,city,postalcode,email,phone] in com.cxpro.data.Customer even though they are annotated as non-null or primitive. Columns returned by the query: [userName]

here is all my code for the Room Database:

Customer.kt