Set UI theme directly in App.onCreate() and not in an asynchronous thread to...

import android.content.Intent

import android.net.Uri

import android.os.StrictMode

import androidx.appcompat.app.AppCompatDelegate

import androidx.appcompat.content.res.AppCompatResources

import androidx.core.graphics.drawable.toBitmap

import at.bitfire.davdroid.log.Logger

import at.bitfire.davdroid.settings.AccountSettings

import at.bitfire.davdroid.settings.Settings

import at.bitfire.davdroid.settings.SettingsManager

import at.bitfire.davdroid.ui.DebugInfoActivity

import at.bitfire.davdroid.ui.NotificationUtils

import at.bitfire.davdroid.ui.UiUtils

        NotificationUtils.createChannels(this)

        // don't block UI for some background checks

        thread {

        // set light/dark mode

            UiUtils.setTheme(this)

        UiUtils.setTheme(this)      // when this is called in the asynchronous thread below, it recreates

                                    // some current activity and causes an IllegalStateException in rare cases

        // don't block UI for some background checks

        thread {

            // create/update app shortcuts

            UiUtils.updateShortcuts(this)