Hello Readers! In this post, we are going to learn how to create and use android spinner programmatically in kotlin file in any android application. We will also learn how to add spinner in linearLayout programmatically in an android application.

Output

Tutorialwing Android Dynamic Spinner Output

Getting Started

At first, we will create android project. Then, we will create and use spinner programmatically in kotlin file.

1. Creating New Project in Kotlin

Follow the steps below to create new project. Please ignore the steps if you have already created a new project.

Now, we will modify xml and kotlin file to use spinner dynamically.

2. Modify Values Folder

Open res/values/strings.xml file. Then, add below code into it.

<resources>
	<string name="app_name">DynamicSpinner</string>
	<string name="selected_item">Selected item:</string>
</resources>

No other values folders have been changed. So, we are not going to mention them here.

3. Modify Layout Folder

Open res/layout/activity_main.xml file. Then, add below code into it.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	android:id="@+id/rootContainer"
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:background="@android:color/white"
	android:gravity="center"
	android:orientation="vertical">

</LinearLayout>

In activity_main.xml file, we have defined a linearLayout, with id rootContainer, that will act as container for the spinner widget created dynamically in the application. Now, we will create android spinner programmatically in kotlin file in the application.

4. Create Android Spinner Programmatically / Dynamically in Kotlin

Open app/src/main/java/com.tutorialwing.dynamicspinner/MainActivity.kt file. Then, add below code into it.

package com.tutorialwing.dynamicspinner

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.View
import android.view.ViewGroup
import android.widget.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val linearLayout = findViewById<LinearLayout>(R.id.rootContainer)

        val spinner = Spinner(this)
        spinner.layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)

        val personNames = arrayOf("Rahul", "Jack", "Rajeev", "Aryan", "Rashmi", "Jaspreet", "Akbar")
        val arrayAdapter = ArrayAdapter(this, android.R.layout.simple_spinner_item, personNames)
        spinner.adapter = arrayAdapter

        spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
                Toast.makeText(this@MainActivity, getString(R.string.selected_item) + " " + personNames[position], Toast.LENGTH_SHORT).show()
            }

            override fun onNothingSelected(parent: AdapterView<*>) {
                // Code to perform some action when nothing is selected
            }
        }

        // Add Spinner to LinearLayout
        linearLayout?.addView(spinner)
    }
}

Here, we have created Spinner programmatically in kotlin file (In MainActivity.kt file). Then, we have created an adapter and set it to spinner. This adapter is responsible to display different options as list in the dropdown in spinner. At last, we have set a listener to display a toast message whenever any option is selected from the dropdown.

Since AndroidManifest.xml file is very important in any android application, we are also going through the code inside this file.

AndroidManifest.xml file

Code inside src/main/AndroidManifest.xml file is –

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamicspinner"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<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>

When we run the program, we will get output as shown above.

That’s end of our tutorial on Creating Android Spinner Programmatically in Kotlin.