jetpack compose - How to use IconToggleButton

MainActivity.kt

package com.cfsuman.jetpackcompose

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.animation.animateColorAsState
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.material.Icon
import androidx.compose.material.IconToggleButton
import androidx.compose.material.Text
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.*
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.font.FontFamily
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContent {
            MainContent()
        }
    }


    @Composable
    fun MainContent(){
        val liked = remember { mutableStateOf(true) }
        val saved = remember { mutableStateOf(false) }

        Column(
            Modifier
                .padding(16.dp)
                .fillMaxWidth(),
            horizontalAlignment = Alignment.CenterHorizontally) {

            Row(Modifier.padding(16.dp)) {
                IconToggleButton(
                    checked = liked.value,
                    onCheckedChange = { liked.value = it }
                ) {
                    val tint by animateColorAsState(
                        if (liked.value) Color(0xFF7BB661)
                        else Color.LightGray
                    )
                    Icon(
                        Icons.Filled.Favorite,
                        contentDescription = "Localized description",
                        tint = tint
                    )

                }

                IconToggleButton(
                    checked = saved.value,
                    onCheckedChange = { saved.value = it }
                ) {
                    val tint by animateColorAsState(
                        if (saved.value) Color(0xFFEC407A)
                        else Color(0xFFB0BEC5)
                    )
                    Icon(
                        Icons.Filled.Save,
                        contentDescription = "Localized description",
                        tint = tint
                    )
                }
            }

            val isLiked = if (liked.value) "Liked" else "Unliked"
            val isSaved = if (saved.value) "Saved" else "Unsaved"

            Text(
                text = "$isLiked and $isSaved",
                fontWeight = FontWeight.Bold,
                fontSize = 25.sp,
                fontFamily = FontFamily.Serif
            )
        }
    }


    @Preview
    @Composable
    fun ComposablePreview(){
        //MainContent()
    }
}