AndroidComposeTemplate.kt

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

@Composable
fun MyApp() {
    ComposeSupportAllScreenSizesTheme {
        // A surface container using the 'background' color from the theme
        Surface(
            modifier = Modifier.fillMaxSize(),
            color = MaterialTheme.colors.background
        ) {

        }
    }
}

@Preview(showBackground = true, name = "Light mode")
@Preview(showBackground = true, name = "Night mode", uiMode = Configuration.UI_MODE_NIGHT_YES)
@Composable
fun DefaultPreview() {
    MyApp()
}