How to get the checked CheckBox value in Android

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

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 checked CheckBox value in Android.

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.CheckBoxActivity5">

    <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 Checked 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
import kotlinx.android.synthetic.main.activity_check_box5.*

class CheckBoxActivity5 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_check_box5)
        val checkBox = findViewById(R.id.checkbox) as CheckBox
        val valueButton = findViewById(R.id.checkboxValue) as Button
        valueButton.setOnClickListener {
            if(checkBox.isChecked){
                Toast.makeText(this@CheckBoxActivity5, "CheckBox Value: "+checkBox.text, Toast.LENGTH_LONG).show()
            }
        }
    }
}

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