[android] How to add a Hint in spinner in XML

For Kotlin !!

Custom Array adapter to hide the last item of the spinner

 import android.content.Context
 import android.widget.ArrayAdapter
 import android.widget.Spinner

 class HintAdapter<T>(context: Context, resource: Int, objects: Array<T>) :
    ArrayAdapter<T>(context, resource, objects) {

    override fun getCount(): Int {
        val count = super.getCount()
        // The last item will be the hint.
        return if (count > 0) count - 1 else count
    }
}

Spinner Extension function to set hint on spinner

fun Spinner.addHintWithArray(context: Context, stringArrayResId: Int) {
    val hintAdapter =
        HintAdapter<String>(
            context,
            android.R.layout.simple_spinner_dropdown_item,
            context.resources.getStringArray(stringArrayResId)
        )
    hintAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
    adapter = hintAdapter
    setSelection(hintAdapter.count)
}

How to use: add the extension by passing context and array on Spinner

spinnerMonth.addHintWithArray(context, R.array.months)

Note: The hint should be the last item of your string array

<string-array name="months">
    <item>Jan</item>
    <item>Feb</item>
    <item>Mar</item>
    <item>Apr</item>
    <item>May</item>
    <item>Months</item>
</string-array>

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