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CheckBox in Kotlin

Last Updated : 15 Jul, 2025

A CheckBox is a special kind of button in Android which has two states either checked or unchecked. The Checkbox is a very common widget to be used in Android. There are many other uses of the CheckBox widget like offering a list of options to the user to choose from and the options are mutually exclusive i.e., the user can select more than one option. This feature of the CheckBox makes it a better option to be used in designing multiple-choice questions application or survey application in android.

Class hierarchy of CheckBox class in Kotlin

kotlin.Any
↳android.view.View
↳ android.view.TextView
↳ android.widget.Button
↳ android.widget.CompoundButton
↳ android.widget.CheckBox

XML attributes of CheckBox widget

XML AttributesDescription
android:idUsed to uniquely identify a CheckBox
android:checkedTo set the default state of a CheckBox as checked or unchechek
android:backgroundTo set the background color of a CheckBox
android:textUsed to store a text inside the CheckBox
android:fontFamilyTo set the font of the text of the CheckBox
android:textSizeTo set the CheckBox text size
android:layout_widthTo set the CheckBox width
android:layout_heightTo set the CheckBox height
android:gravityUsed to adjust the CheckBox text alignment
android:paddingUsed to adjust the left, right, top and bottom padding of the CheckBox

Example

This example demonstrates the steps involved in designing an activity that consists of 5 CheckBox and an additional submit button to display a toast message that user response has been recorded.

Note: Following steps are performed on Android Studio version 4.0

Steps Implementation of CheckBox with Example

We will understand the CheckBox Implementation in Android Kotlin with a example. Below is the Step by Step implementation for it.

Step 1: Create new project

  • Click on File, then New => New Project.
  • Choose “Empty Activity” for the project template.
  • Select language as Kotlin.
  • Select the minimum SDK(According to the application needs).

Step 2: Open activity_main.xml file

Below is the code for activity_main.xml file to add 5 CheckBox. A normal "submit" button is also added to display a toast message that user response has been recorded.

Layout:

👁 Layout_CheckBoxKotlin


Step 3: Open MainActivity.kt file

Below is the code for MainActivity.kt file to access CheckBox widget in Kotlin file and show a proper message whenever the submit button is clicked by the user.

MainActivity.kt:

Output:



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