Unresolved reference error in Kotlin files in a Java+Kotlin Android project

Question

I am working on a Kotlin+Java hybrid project.

The Gradle version and plugin were recently upgraded to 3.1.3 and 4.4 respectively.

Now while compiling, I am getting an error of 'unresolved reference' in a few of the Kotlin files.

Eg. -

return when (item?.itemId) {
        android.R.id.home -> {
            finish()
            true
        }
        else -> super.onOptionsItemSelected(item)
    }

In the above code getting compilation error in android.R.id.home as unresolved reference.

Also in

root_low_rating_nps.viewTreeObserver.removeOnGlobalLayoutListener(keyboardLayoutListener)

Getting the 'unresolved reference' error in finding 'removeOnGlobalLayoutListener'

I have been stuck on this for 5 days.

Tried moving the Kotlin buildscript dependencies in the app module's build.gradle, invalidate caches and restart, refresh, deleting .idea/ folder.

Can anyone help resolve this issue?

Thanks

Does the same happen when building from the command line? For example, if you run ./gradlew assembleDebug. — zsmb13
– zsmb13, Commented Jul 23, 2018 at 9:52
I've hit with a similar issue too and worked around it by wrapping the unresolved class in a java class and using that java class in my Kotlin code… Now I'm hitting it again somewhere else… this is quite annoying… maybe downgrading Kotlin fixes it? — Carlos Fonseca
– Carlos Fonseca, Commented Jul 31, 2018 at 10:29
@CarlosFonseca Did you try the accepted solution(updating libraries)? — Shashank Saxena
– Shashank Saxena, Commented Aug 6, 2018 at 8:29

Shashank Saxena · Accepted Answer · 2018-08-01 05:42:51Z

2

I was able to find a solution for this.

Turns out, (and I don't know the reason why), but after upgrading the Gradle version and Kotlin plugin, the older version of a library was causing some kind of interference. I updated

com.birbit:android-priority-jobqueue:1.3

to

com.birbit:android-priority-jobqueue:2.0.1

which was the latest available version and the issue was resolved.

If anyone else runs into this issue, try updating all your dependencies to the latest version.

And if anyone identifies the actual reason for this, please let me know as well.

Thanks

answered Aug 1, 2018 at 5:42

Shashank Saxena

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