Create An Android Radio Group Programmatically in Kotlin

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

Output

Tutorialwing Android Dynamic Radio Group Output Android Radio Group Programmatically in kotlin

Tutorialwing Android Dynamic Radio Group Output

Getting Started

At first, we will create android project. Then, we will create and use radio group 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.

Step Description
1. Open Android Studio.
2. Go to File => New => New Project. Write application name as DynamicRadioGroup. Then, check Include Kotlin Support and click next button.
3. Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button
4. Then, select Empty Activity => click next => click finish.
5. At this point, You will get a newly created android project successfully.

Now, we will modify xml and other file to use Radio Group programmatically in kotlin file.

2. Modify Values Folder

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

<resources>
	<string name="app_name">DynamicRadioGroup</string>
	<string name="male">Male</string>
	<string name="female">Female</string>
	<string name="you_selected">You selected:</string>
</resources>

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: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 radio group created programmatically in kotlin file in the application.

4. Create Android Radio Group Programmatically / Dynamically in Kotlin

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

package com.tutorialwing.dynamicradiogroup

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.RadioButton
import android.widget.RadioGroup
import android.widget.Toast

class MainActivity : AppCompatActivity() {

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

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

        // Create RadioButton Dynamically
        val radioButton1 = RadioButton(this)
        radioButton1.layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        radioButton1.setText(R.string.male)
        radioButton1.id = 0

        val radioButton2 = RadioButton(this)
        radioButton2.layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        radioButton2.setText(R.string.female)
        radioButton2.id = 1

        val radioGroup = RadioGroup(this)
        val params = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        params.setMargins(40, 0, 0, 0)
        radioGroup.layoutParams = params

        radioGroup.addView(radioButton1)
        radioGroup.addView(radioButton2)
        linearLayout.addView(radioGroup)

        radioGroup.setOnCheckedChangeListener { group, checkedId ->
            var text = getString(R.string.you_selected)
            text += " " + getString(if (checkedId == 0) R.string.male else R.string.female)
            Toast.makeText(applicationContext, text, Toast.LENGTH_SHORT).show()
        }
    }
}

We have created radio group programmatically in kotlin file i.e. in MainActivity.kt file. We have also created two radio buttons dynamically in this file. After that, we have these radio buttons to radio group. Then, we have added this radio group to linearLayout programmatically. At last, we have set checked listener to radio group to show toast message whenever there is change in radio button selections.

Since AndroidManifest.xml file is very important in any android application, we are also going to see the content 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.dynamicradiogroup"
		  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 Radio Group Programmatically in Kotlin.

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Greetings!
We have recently published 100+ articles on android tutorials with kotlin and java. If you need, you may visit Android Tutorial for beginners page. You can also check Kotlin Tutorial for beginners