RecyclerView sometimes doesn't refresh when adding a new item about kotlin-notepad

[dnbit]

@ZeGerm4n
You are using custom ROMs in your devices. In order to verify that everything would work properly in every single non-stock ROM and device combination, we would need to have every physical device and non-stock ROM combination, plus various lifetimes of testing.

Because the Android platform is open and implementers are free to make a lot of decisions on their own, sometimes there are differences between ROMs that can be difficult to debug.

[ZeGerm4n]

Just tried running the project on Emulator images with API versions 22, 23, 25, 27. All of them where default set-ups of virtual google Nexus devices available for selection in AVD Manager. I noticed that all of these had this issue. The Oreo one (of which I previously thought it had no issues) seems to encounter this problem too, but less frequently. Seems like it has nothing to do with the custom ROMs I use on the real devices :/ I would be very grateful if someone could check what might cause the problem, as of I am not familiar enough with android development to do it myself.

[ZeGerm4n]

In case someone encounters the same problem:
On the edge of despair I did following... I "fixed" the behaviour by using startActivityForResult() to call CreateActivity. In CreateActivity I query the new item count in the database after inserting a new item and pass that integer in setResult() before finishing the Activity. Back in MainActivity, in onActivityResult() I compare the the item count of the database with the item count in RecyclerViewAdapter and finally call refresh if those values are unequal

[dnbit]

That's an overkill @ZeGerm4n You should not need to do that.
I have tried in various versions and it works for me. It seems that I cannot reproduce it.
In which branch do you see the error? Any tips to reproduce it?

[ZeGerm4n]

I encountered the problem on the 'final' branch. Last time I could reproduce it was by killing the App completely then restarting it and trying to add multiple items. After creating 1-3 items the newest one would only be displayed after adding another one. I just tried to reproduce it again, but the closest I could get to above described behaviour was that the RecyclerView took a second to display the newly created item. I'm baffled, have no idea what could have been the culprit and why I cannot reproduce that error anymore o_O anyway thank you for looking into it