为什么我不能通过导航组件中的全局操作传递 arguments？

Question

I´m trying to pass an argument with an global action from one destination to another. I saw this method on the inte.net but it don´t work for any reasons and I can´t find a solution for it. I would be thankful for any help. How I´m trying to pass the argument:

epoxyController = EventListEpoxyController { eventClickedID ->
        val navDirections = NavGraphDirections.actionGlobalEventHolder(eventID = eventClickedID)
        findNavController().navigate(navDirections)

I added an argument to the eventholder destination in my navgraph and also added an global action. But for some reasons I can´t find a value for it the word is red and the error is like

Named arguments are not allowed for non-Kotlin functions Cannot find a parameter with this name: eventID < Thats how my navgraph looks like:

<fragment
    android:id="@+id/eventHolder"
    android:name="de.n.newtest.ui.Fragments.Details.EventHolderKT"
    android:label="fragment_event_holder">
    <argument
        android:name="eventid"
        android:defaultValue="-1"
        app:argType="integer" />
<action
    android:id="@+id/action_global_eventHolder"
    app:destination="@id/eventHolder"
    app:enterAnim="@anim/holderslideinright"
    app:exitAnim="@anim/holderslideoutleft"
    app:popEnterAnim="@anim/holderslideinleft"
    app:popExitAnim="@anim/holderslideoutright">

What did I miss?

Answer 1

val navDirections = NavGraphDirections.actionGlobalEventHolder(eventID = eventClickedID)

The eventID is created by the IDE to illustrate that this parameter is the callback parameter that points to eventClickedID , and it's not supposed to write it yourself as the error implies:

 Named arguments are not allowed for non-Kotlin functions Cannot find a parameter with this name: eventID < Thats how my navgraph looks like:

So, you just need to remove it:

epoxyController = EventListEpoxyController { eventClickedID ->
        val navDirections = NavGraphDirections.actionGlobalEventHolder(eventClickedID)
        findNavController().navigate(navDirections)
}

Answer 2

You're using android:name="eventid" . That means that the named parameter for actionGlobalEventHolder is eventid , not eventID .

You'll want to either change your android:name to eventID or update your code to use eventid .

Of course, using a named argument is never a requirement, so you could leave it out entirely.