Смена дневной/ночной темы

AppThemeDelegate.kt

import android.content.res.Configuration
import android.os.Build
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.app.AppCompatDelegate
import androidx.core.content.ContextCompat
import ru.dit.smartstaff.R
import ru.dit.smartstaff.repositories.AppThemeRepository

class AppThemeDelegate {

    fun setAppTheme(activity: AppCompatActivity) {

        val nightModeFlags = activity.resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK
        val isDarkTheme = AppThemeRepository.isDarkTheme()

        val currentMode = if (isDarkTheme) {
            Configuration.UI_MODE_NIGHT_YES
        } else {
            Configuration.UI_MODE_NIGHT_NO
        }
        if (nightModeFlags != currentMode) {
            val defaultNightMode = if (isDarkTheme) {
                AppCompatDelegate.MODE_NIGHT_YES
            } else {
                AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
            }

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                activity.delegate.localNightMode = defaultNightMode
            } else {
                AppCompatDelegate.setDefaultNightMode(defaultNightMode)
            }
        }

        updateStatusBarColor(activity)
    }

    fun setFollowSystemTheme(activity: AppCompatActivity) {
        val defaultNightMode = AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            activity.delegate.localNightMode = defaultNightMode
        } else {
            AppCompatDelegate.setDefaultNightMode(defaultNightMode)
        }

        updateStatusBarColor(activity)
    }

    fun updateStatusBarColor(activity: AppCompatActivity) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return

        val mode = activity.resources?.configuration?.uiMode?.and(Configuration.UI_MODE_NIGHT_MASK)

        val window = activity.window
        window.statusBarColor = ContextCompat.getColor(activity, R.color.background)

        when (mode) {
            Configuration.UI_MODE_NIGHT_YES -> {
                window.decorView.systemUiVisibility = window.decorView.systemUiVisibility and
                        View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR.inv()
            }
            Configuration.UI_MODE_NIGHT_NO -> {
                window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
            }
        }
    }

}