How can I remove an object in Kotlin from ArrayAdapter

Question

I have a LoadingListView which contains this:

 var adapter: ArrayAdapter<*>? = null
    private set

When I delete a item, I do this:

adapter?.remove(wallboardToDelete)

This says: required Nothing! found MyObject

How can I fix this? I tried using in my ListView ArrayAdapter<Any>? and the removeWorks, but then my init from all my classes that extend gives me an issue saying that: I need ArrayAdapter instead of MyArrayAdapterFromListExtendingThis.

Try var adapter: ArrayAdapter<Any>? = null. Btw consider using val over var! — Cilenco
– Cilenco, Commented Aug 22, 2019 at 13:46
I want just "wallboardToDelete" to delete, not the full ArrayAdapter. That item is being selected from a "for loop" that checks what to remove — rosu alin
– rosu alin, Commented Aug 22, 2019 at 13:47
That should work with my solution as well. Don't you have a common interface or super class which all items extend from`? — Cilenco
– Cilenco, Commented Aug 22, 2019 at 13:49
From your last section I assume that you use this code in an abstract class or so? — Cilenco
– Cilenco, Commented Aug 22, 2019 at 13:52
Yes. ArrayAdapter is from a class (LoadingListView) that is being Extended by others. pastebin.com/qEAHdt15 — rosu alin
– rosu alin, Commented Aug 22, 2019 at 13:57

Shermano · Accepted Answer · 2019-08-22 13:57:45Z

2

Try to change your declaration from ArrayAdapter<*> to ArrayAdapter<Any>.
<*> is used for represent a fixed type wich you don't know what is, so it can contain Int type, but only Int then

answered Aug 22, 2019 at 13:57

Shermano

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3 Comments

Shermano Over a year ago

Also take a look on this link for more information: kotlinlang.org/docs/reference/generics.html#star-projections

rosu alin Over a year ago

Thanks. I did that and then when I init I would cast to ArrayAdapter<Any> my adapters, and it works now :D

a_local_nobody Over a year ago

actually very interesting, did not know that <*> is used just for one single type

Cilenco · Accepted Answer · 2019-08-22 14:03:46Z

0

From the code you postes on the website in the comment why don't you use something like this?

class LoadingListView<T> : RelativeLayout {
    var adapter: ArrayAdapter<T>? = null
        private set

    // ...

    fun init(adapter: ArrayAdapter<T>, loadingListListener: LoadingListListener, noTextRes: Int) {
        this.adapter = adapter;
        // ...
    }

    // ...
}

answered Aug 22, 2019 at 14:03

Cilenco

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