How to dynamically add Spinner hint in Kotlin

In this android kotlin source code example, we are going to dynamically add Spinner hint in Kotlin.

You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.

Below is a step by step source code to dynamically add Spinner hint in Kotlin.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="24dp"
    tools:context=".spinner.SpinnerActivity4">

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import android.content.Context
import android.graphics.Color
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.view.ViewGroup
import android.widget.ArrayAdapter
import android.widget.Spinner
import android.widget.TextView
import com.bluapp.kotlinview.R

class SpinnerActivity4 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_spinner4)
        val spinner = findViewById(R.id.spinner) as Spinner
        val userNames = arrayOf("Select Name..","Henry", "Mark", "Jack", "Smith", "Clark", "Kelvin", "Denzel")
        val customArrayAdapter = CustomArrayAdapter<String>(this@SpinnerActivity4, userNames)
        spinner.adapter = customArrayAdapter
    }

    internal class CustomArrayAdapter<T>(ctx: Context, objects: Array<T>) :
        ArrayAdapter<T>(ctx, android.R.layout.simple_spinner_item, objects) {
        override
        fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup): View {
            val view = super.getView(position, convertView, parent)
            val text = view.findViewById(android.R.id.text1) as TextView
            if(position==0){
                text.setTextColor(Color.GRAY)
            }else{
                text.setTextColor(Color.BLACK)
            }
            return view
        }
    }
}

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