MainActivityDialog.kt

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            JetpackComposeDemoTheme {
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colors.background
                ) {
                    HomePage()
                }
            }
        }
    }
}

@Composable
fun HomePage(){

    val showDialog =  remember { mutableStateOf(false) }

    if(showDialog.value)
        CustomDialog(value = "", setShowDialog = {
            showDialog.value = it
        }) {
            Log.i("HomePage","HomePage : $it")
        }

    Scaffold(
        topBar = {
            TopAppBar(
                title = {
                    Text(text = "Home")
                }
            )
        }) {
        Box(modifier = Modifier.background(Color.White)) {
            Column(
                modifier = Modifier
                    .fillMaxSize()
                    .background(Color.White),
                verticalArrangement = Arrangement.Center,
                horizontalAlignment = Alignment.CenterHorizontally,
            ) {
                Button(onClick = {
                    showDialog.value = true
                }) {
                    Text(text = "Open Dialog")
                }
            }
        }
    }
}


@Preview(showBackground = true)
@Composable
fun DefaultPreview() {
    JetpackComposeDemoTheme {
        HomePage()
    }
}