How to use Databinding with Spinner in Kotlin

In this android kotlin source code example, we are going to use Databinding with Spinner 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 use Databinding with Spinner in Kotlin.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout 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">
    <data>
        <variable
            name="spinnerAdapter"
            type="android.widget.ArrayAdapter"/>
    </data>
<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="24dp">

    <Spinner
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:adapter="@{spinnerAdapter}"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>


</androidx.constraintlayout.widget.ConstraintLayout>
    </layout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.ArrayAdapter
import androidx.databinding.DataBindingUtil
import com.bluapp.kotlinview.R
import com.bluapp.kotlinview.databinding.ActivitySpinner19Binding

class SpinnerActivity19 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding: ActivitySpinner19Binding = DataBindingUtil.setContentView(this, R.layout.activity_spinner19)
        val userNames = arrayOf("Henry", "Mark", "Jack", "Smith", "Clark", "Kelvin", "Denzel")
        val arrayadapter = ArrayAdapter(this@SpinnerActivity19, android.R.layout.simple_spinner_item, userNames)
        binding.spinnerAdapter = arrayadapter
    }


}

app/build.gradle

dataBinding {
        enabled = true
    }
dependencies {
    kapt "com.android.databinding:compiler:3.5.0"
}

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