Night Mode inflater

code.kt

/*
 * Copyright 2017 Google, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.content.Context
import android.content.res.Configuration
import android.support.annotation.LayoutRes
import android.view.ContextThemeWrapper
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup

fun inflateNightModeView(
        context: Context,
        @LayoutRes layoutId: Int,
        container: ViewGroup?,
        isNightMode: Boolean): View {
    val context = ContextThemeWrapper(
            createNightModeContext(context, isNightMode),
            R.style.Theme_AppCompat_DayNight) // This should point to your theme
    return LayoutInflater.from(context).inflate(layoutId, container, false)
}

fun createNightModeContext(context: Context, isNightMode: Boolean): Context {
    val uiModeFlag = if (isNightMode) Configuration.UI_MODE_NIGHT_YES else Configuration.UI_MODE_NIGHT_NO
    val config = Configuration(context.resources.configuration)
    config.uiMode = uiModeFlag or (config.uiMode and Configuration.UI_MODE_NIGHT_MASK.inv())
    return context.createConfigurationContext(config)
}