问如何在构图主题中更改primaryVariant颜色？

EN

  private val MyLightColorPalette = lightColors(
    primary = Green,
    primaryVariant = Grey,
    onPrimary = Color.White,
    secondary = Green,
    secondaryVariant = Grey,
    onSecondary = Color.White,
    error = DarkGrey,
)

@Composable
fun MyAppTheme(darkTheme: Boolean = isSystemInDarkTheme(), content: @Composable () -> Unit) {
    val colors = if (darkTheme) {
        MyDarkColorPalette
    } else {
        MyLightColorPalette
    }
    MaterialTheme(
            colors = colors,
            typography = Typography,
            shapes = Shapes,
            content = content
    )
}

@AndroidEntryPoint
class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MyAppTheme {
                Scaffold() {
                    TopBar()
                }
            }
        }
    }
}