How to dynamically change Spinner background color in Kotlin

In this android kotlin source code example, we are going to dynamically change Spinner background color 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 change Spinner background color 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.SpinnerActivity7">

    <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 androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.ArrayAdapter
import android.widget.Spinner
import com.bluapp.kotlinview.R

class SpinnerActivity7 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_spinner7)
        val spinner = findViewById(R.id.spinner) as Spinner
        spinner.background=resources.getDrawable(R.drawable.spinner_background)
        val userNames = arrayOf("Henry", "Mark", "Jack", "Smith", "Clark", "Kelvin", "Denzel")
        val arrayadapter = ArrayAdapter(this@SpinnerActivity7, android.R.layout.simple_spinner_item, userNames)
        spinner.adapter = arrayadapter
    }
}

drawable/spinner_background.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <layer-list>
            <item>
                <shape>
                    <stroke android:width="2dp" android:color="@color/colorAccent" />
                    <solid android:color="@color/colorAccent"/>
                    <padding android:bottom="4dp" android:left="4dp" android:right="4dp" android:top="4dp" />
                </shape>
            </item>
            <item>
                <bitmap android:gravity="right|center_vertical" android:src="@android:drawable/arrow_down_float" />
            </item>

        </layer-list>
    </item>
</selector>

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