MainActivity.kt

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

        setContent {
            // Calling our Refactored function
            GreetUser("DEEJAY")
        }
    }

    // To Live Preview This
    @Composable
    fun GreetUser(name: String) {
        Text(text = "Hello $name!")
    }

    // We annotate this one with
    // @Preview
    @Preview
    @Composable
    fun PreviewGreetUser() {
        // Calling our function
        // which we want to Preview
        GreetUser("Medium")
    }
    
}