How to get Spinner value in Kotlin?

This example demonstrates how to get Spinner value in Kotlin.

Step 1 − Create a new project in Android Studio, go to File ⇉ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">
   <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_marginTop="50dp"
      android:text="Tutorials Point"
      android:textAlignment="center"
      android:textColor="@android:color/holo_green_dark"
      android:textSize="32sp"
      android:textStyle="bold" />
   <Spinner
      android:id="@+id/spinner"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true" />
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@id/spinner"
      android:layout_centerInParent="true"
      android:layout_marginTop="25dp"
      android:textColor="@android:color/holo_purple"
      android:textSize="16sp"
      android:textStyle="italic|bold" />
</RelativeLayout>

Step 3 − Open res/strings.xml and add the following code −

<resources>
   <string name="app_name">Q39</string>
   <string-array name="birds">
      <item>crane</item>
      <item>Cuckoo</item>
      <item>Pigeon</item>
      <item>Eagle</item>
      <item>Owl</item>
      <item>Vulture</item>
      <item>WoodPecker</item>
   </string-array>
</resources>

Step 4 − Add the following code to MainActivity.kt

import android.os.Bundle
import android.view.View
import android.widget.AdapterView
import android.widget.ArrayAdapter
import android.widget.Spinner
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity(), AdapterView.OnItemSelectedListener {
   lateinit var spinner: Spinner
   lateinit var textView: TextView
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      textView = findViewById(R.id.textView)
      spinner = findViewById(R.id.spinner)
      val adapter = ArrayAdapter.createFromResource(
         this,
         R.array.birds,
         android.R.layout.simple_spinner_item
      )
      adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
      spinner.adapter = adapter
      spinner.onItemSelectedListener = this
   }
   override fun onNothingSelected(parent: AdapterView<*>?) {
      TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
   }
   override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
      val text: String = parent?.getItemAtPosition(position).toString()
      textView.text = text
   }
}

Step 5 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="app.com.q36">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −

Click here to download the project code.

Azhar

Updated on: 21-Apr-2020

3K+ Views

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