jetpack compose - Scaffold with Snackbar

MainActivity.kt

package com.cfsuman.jetpackcompose

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.material.Text
import androidx.compose.material.TopAppBar
import androidx.compose.material.icons.filled.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import kotlinx.coroutines.launch


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


    @Composable
    fun GetScaffold(){
        val scaffoldState: ScaffoldState = rememberScaffoldState(
            snackbarHostState = SnackbarHostState()
        )

        Scaffold(
            scaffoldState = scaffoldState,
            topBar = {
                TopAppBar(
                    title = { Text(text = "Compose - Scaffold + Snackbar")},
                    backgroundColor = Color(0xFFC0E8D5),
                )
            },
            content = {MainContent(scaffoldState)},
            backgroundColor = Color(0xFFEDEAE0),
        )
    }


    @Composable
    fun MainContent(scaffoldState: ScaffoldState){
        val scope = rememberCoroutineScope()

        Box(
            modifier = Modifier.fillMaxSize(),
            contentAlignment = Alignment.Center
        ){
            Button(onClick = {
                scope.launch{
                    scaffoldState.snackbarHostState.showSnackbar(
                        message = "I am a Snackbar",
                    )
                }
            }) {
                Text(text = "Show Snackbar")
            }
        }
    }


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