Jetpack Compose Dark Theme Main Activity Part 1

MainActivity.kt

class MainActivity : ComponentActivity() {
    private val themeViewModel: ThemeViewModel by viewModels()
    private lateinit var dataStoreUtil: DataStoreUtil

    override fun onCreate(savedInstanceState: Bundle?) {
        //...
        dataStoreUtil = DataStoreUtil(applicationContext)

        val systemTheme = when (resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK) {
            Configuration.UI_MODE_NIGHT_YES -> { true }
            Configuration.UI_MODE_NIGHT_NO -> { false }
            else -> { false }
        }

        setContent {
            val theme = dataStoreUtil.getTheme(systemTheme).collectAsState(initial = systemTheme)

            JetpackComposeDarkThemeTheme(
                darkTheme = theme.value,
            ) {
                Surface(
                    //...
                ) {
                    DarkThemeScreen(dataStoreUtil, themeViewModel)
                }
            }
        }
    }
}