How to store CheckBox state in Shared Preference in Kotlin

In this android kotlin source code example, we are going to store CheckBox state in Shared Preference 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 store CheckBox state in Shared Preference 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.CheckBoxActivity12">

    <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="Save Checked State"
        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 android.content.Context
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 CheckBoxActivity12 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_check_box12)
        val checkBox = findViewById(R.id.checkbox) as CheckBox
        val valueButton = findViewById(R.id.checkboxValue) as Button
        checkBox.isChecked = loadCheckBox(checkBox.text.toString())
        valueButton.setOnClickListener {
                Toast.makeText(this@CheckBoxActivity12, "CheckBox State Save", Toast.LENGTH_LONG).show()
            saveCheckbox(checkBox.isChecked, checkBox.text.toString())
        }
    }

    fun saveCheckbox(isChecked: Boolean, key: String){
        val sharedpreferences = getPreferences(Context.MODE_PRIVATE)
        val editor = sharedpreferences.edit()
        editor.putBoolean(key, isChecked)
        editor.apply()
    }

    fun loadCheckBox(key: String):Boolean{
        val sharedpreferences = getPreferences(Context.MODE_PRIVATE)
        return sharedpreferences.getBoolean(key, false)
    }
}

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