Set array from Kotlin to Android spinner when spinner expects XML string array

Question

I have used Android's spinner for static values by setting string-array in XML resources. This works without issue.

However, for a specific spinner, I need to set data dynamically based on API returns. While I have set the returned values into an array of strings, when I send this to the adapter, it expects type Int (which a returned string-array from XML translates into).

I'm not sure how to make these arrays work within Kotlin to be received by the spinner.

val managerSpinner: Spinner = binding.spinnerManager
        val managerList: MutableList<String> = mutableListOf()
        var managerArr: Array<String>

        viewModel.managers.observe(viewLifecycleOwner, {
            if (null != it) {
                it.items?.forEach { manager ->
                    managerList.add(manager.fullname!!)
                }
                managerArr = managerList.toTypedArray()
                ArrayAdapter.createFromResource(
                        activity?.applicationContext!!,
                        managerArr!!,
                        android.R.layout.simple_spinner_item
                ).also { adapter ->
                    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
                    managerSpinner.adapter = adapter
                }
            }
        })

hakim · Accepted Answer · 2021-02-01 03:09:43Z

2

how about like this:

it use ArrayAdapter constructor rather than using createFromResource function factory
use addAll function to add item

val managerSpinner: Spinner = binding.spinnerManager
        val managerList: MutableList<String> = mutableListOf()
        var managerArr: Array<String>

        viewModel.managers.observe(viewLifecycleOwner, {
            if (null != it) {
                it.items?.forEach { manager ->
                    managerList.add(manager.fullname!!)
                }
                managerArr = managerList.toTypedArray()
                ArrayAdapter(
                        activity?.applicationContext!!,
                        android.R.layout.simple_spinner_item
                ).also { adapter ->
                    adapter.addAll(managerArr)
                    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
                    managerSpinner.adapter = adapter
                }
            }
        })

answered Feb 1, 2021 at 3:09

hakim

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2 Comments

lanierc Over a year ago

Initially, this didn't work because it wouldn't consume the array. So I attempted this while just using the MutableList, and that allows for it to set. Thanks for guiding me to the right answer!

lanierc Over a year ago

Also, I had to add a type of String to ArrayAdapter for it to work properly, but those are just minor fixes.

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