StateListAnimator not working on checkbox

I am following the article given here

I am trying to create a "like" button animation and need help since my animator does not seem to be doing anything

I have created the required animator file, created the stateListDrawable file and set it as the background to the CheckBox The animator file uses a set of objectAnimator tags which animate the scaleX, scaleY and translationZ properties.

This is my layout file "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:background="@android:color/white"
android:layout_height="match_parent"
tools:context=".MainActivity">

<CheckBox
    android:id="@+id/checkbox"
    android:button="@null"
    android:checked="false"
    android:background="@drawable/like_icon"
    android:layout_width="60dp"
    android:layout_height="60dp"
    android:stateListAnimator="@animator/scale2"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout> 

This is the stateListDrawable "like_icon.xml"

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

<item android:drawable="@drawable/ic_thumb_up_red_24dp" 
android:state_checked="true" />

<item android:drawable="@drawable/ic_thumb_up_black_24dp" />
</selector>

This is my animator named "scale.xml". It is placed correctly in the "res/animator/" folder

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">

<objectAnimator
    android:duration="@android:integer/config_longAnimTime"
    android:propertyName="scaleX"
    android:valueTo="1.525"
    android:valueType="floatType" />

<objectAnimator
    android:duration="@android:integer/config_longAnimTime"
    android:propertyName="scaleY"
    android:valueTo="1.525"
    android:valueType="floatType" />

<objectAnimator
    android:duration="@android:integer/config_longAnimTime"
    android:propertyName="translationZ"
    android:valueTo="4dp"
    android:valueType="floatType" />

<objectAnimator
    android:duration="@android:integer/config_longAnimTime"
    android:propertyName="scaleX"
    android:valueTo="1.0"
    android:startOffset="@android:integer/config_longAnimTime"
    android:valueType="floatType" />

<objectAnimator
    android:duration="@android:integer/config_longAnimTime"
    android:propertyName="scaleY"
    android:startOffset="@android:integer/config_longAnimTime"
    android:valueTo="1.0"
    android:valueType="floatType" />

<objectAnimator
    android:duration="@android:integer/config_longAnimTime"
    android:propertyName="translationZ"
    android:startOffset="@android:integer/config_longAnimTime"
    android:valueTo="0dp"
    android:valueType="floatType" />

</set>