A ConstraintLayout that implements Checkable interface

CheckableConstraintLayout.kt

package com.yourcompany.name

import android.content.Context
import android.util.AttributeSet
import android.view.View
import android.widget.Checkable
import androidx.constraintlayout.widget.ConstraintLayout

class CheckableConstraintLayout @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : ConstraintLayout(context, attrs, defStyleAttr), Checkable {

    private var checked = false

    override fun setChecked(checked: Boolean) {
        this.checked = checked
        refreshDrawableState()
    }

    override fun isChecked(): Boolean {
        return checked
    }

    override fun toggle() {
        isChecked = !checked
        refreshDrawableState()
    }

    override fun onCreateDrawableState(extraSpace: Int): IntArray {
        val drawableState = super.onCreateDrawableState(extraSpace + 1)
        if (isChecked) {
            View.mergeDrawableStates(
                drawableState,
                CheckedStateSet
            )
        }
        return drawableState
    }

    override fun performClick(): Boolean {
        toggle()
        return super.performClick()
    }

    companion object {
        private val CheckedStateSet = intArrayOf(
            android.R.attr.state_checked
        )
    }
}