How to get the value of CheckBox in Kotlin

In this android kotlin source code example, we are going to get the value of CheckBox 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 get the value of CheckBox in Kotlin.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".CheckBox.CheckBoxActivity9">

    <CheckBox
        android:id="@+id/checkbox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="CheckBox"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

    <Button
        android:id="@+id/checkboxValue"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Get Checkbox Value"
        android:textColor="#ffffff"
        android:background="@color/colorAccent"
        android:layout_margin="10dp"
        app:layout_constraintTop_toBottomOf="@id/checkbox"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.CheckBox
import android.widget.Toast
import com.bluapp.kotlinview.R

class CheckBoxActivity9 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_check_box9)
        val checkBox = findViewById(R.id.checkbox) as CheckBox
        val valueButton = findViewById(R.id.checkboxValue) as Button
        valueButton.setOnClickListener {
                Toast.makeText(this@CheckBoxActivity9, "CheckBox Value: "+checkBox.text, Toast.LENGTH_LONG).show()
        }
    }
}

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