How to dynamically set the default value of CheckBox in Kotlin

In this android kotlin source code example, we are going to dynamically set the default 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 dynamically set the default 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:id="@+id/constraintLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".CheckBox.CheckBoxActivity19">

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.ViewGroup
import android.widget.CheckBox
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.constraintlayout.widget.ConstraintSet
import com.bluapp.kotlinview.R

class CheckBoxActivity19 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_check_box19)
        val constraintLayout = findViewById(R.id.constraintLayout) as ConstraintLayout
        val conParam = ConstraintLayout.LayoutParams(
            ViewGroup.LayoutParams.WRAP_CONTENT,
            ViewGroup.LayoutParams.WRAP_CONTENT
        )
        conParam.topToTop = ConstraintSet.PARENT_ID
        conParam.bottomToBottom = ConstraintSet.PARENT_ID
        conParam.startToStart = ConstraintSet.PARENT_ID
        conParam.endToEnd = ConstraintSet.PARENT_ID
        val checkbox = CheckBox(this)
        checkbox.text = "CheckBox"
        checkbox.isChecked=true
        constraintLayout.addView(checkbox, conParam)
    }
}

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