Merge "Add startDestination arg to SpaActivity"

        android:label="@string/app_label"

        android:supportsRtl="true">

        <activity

            android:name="com.android.settingslib.spa.gallery.MainActivity"

            android:name=".MainActivity"

            android:exported="true">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

    override fun onCreate(savedInstanceState: Bundle?) {

        setTheme(R.style.Theme_SpaLib_DayNight)

        super.onCreate(savedInstanceState)

        setContent {

            SettingsTheme {

                MainContent()

            }

        }

    }

    @Composable

    private fun MainContent() {

        SettingsTheme {

        val startDestination =

            intent?.getStringExtra(KEY_START_DESTINATION) ?: settingsPageRepository.startDestination

        val navController = rememberNavController()

        CompositionLocalProvider(navController.localNavController()) {

                NavHost(navController, settingsPageRepository.startDestination) {

            NavHost(navController, startDestination) {

                for (page in settingsPageRepository.allPages) {

                    composable(

                        route = page.route,

            }

        }

    }

    }

    private val SettingsPageProvider.route: String

        get() = name + arguments.joinToString("") { argument -> "/{${argument.name}}" }

    companion object {

        const val KEY_START_DESTINATION = "spa:SpaActivity:startDestination"

    }

}