And none of my definitions of

ListUpdateCallback

pass it a type parameter

try to clean project

I tried (in Android Studio and command line gradle). It builds, but when I try to deploy the app I get the above error

deploy?

Run the app

It looks like compilation error, not runtime

Downgrading to 1.1.3-2 builds and runs fine

It is a compilation error. But it only happens when I try to run the app. Building doesn't error

Do you use instant run?

Hmm I have it enabled but I wasn't using it. I'll try disabling and see what happens

When you have enabled instant run you actually use it when press “run” button

Disabled it, and now I get the error when I rebuild the project

Oh my bad, building causes the error as well as running. It was the gradle sync that was working

So it happens any time that I build

Maybe you could check code of generated stub and it give you some clues

Out of curiosity, why does

kapt3

create stubs of all my kotlin classes?

Indeed line 6 in the stub contains:

private final android.support.v7.util.ListUpdateCallback<com.mikepenz.fastadapter.IItem> listCallback = null;

But the kotlin code is:

private val listCallback = object : ListUpdateCallback {
    override fun onInserted(position: Int, count: Int) =
        fastAdapter.notifyAdapterItemRangeInserted(position.global, count)

    override fun onChanged(position: Int, count: Int, payload: Any?) =
        fastAdapter.notifyAdapterItemRangeChanged(position.global, count, payload)

    override fun onMoved(fromPosition: Int, toPosition: Int) =
        fastAdapter.notifyAdapterItemMoved(fromPosition.global, toPosition.global)

    override fun onRemoved(position: Int, count: Int) =
        fastAdapter.notifyAdapterItemRangeRemoved(position.global, count)
  }

  init {
    itemList.listCallback = listCallback
  }

itemList.listCallback

is defined in:

interface ItemListStrategy<Item : IItem<*, *>> {
  var listCallback: ListUpdateCallback?
}

It needed to use java annotation processing

But your case is really strange

Is it possible that there's an off by one error in kapt3 that is pulling the type parameter from the line above it?

never see something like this, but it’s really looks like a bug

Filed a bug in youtrack - https://youtrack.jetbrains.com/issue/KT-19700

did you enable the experimental features for the android-extensions plugin?

Do you mean

androidExtensions {
    experimental = true
}

?

yes

I upgaded plugin, updated kotlin version on the project, added experimental code block. Used @Parcelize annotation and implemented Parcelable

with a similar error

This message looks like IDE warning and it’s fine. Could you please show error from build logs?

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