Dark theme android app

Question

I'm trying to create a dark theme similar to the one in OxygenOS on OnePlus devices.

I changed the window background to black but the problem is the action bar is not becoming pure black.

<style name="DarkTheme" parent="Theme.AppCompact">
    <item name="android:colorPrimary">@color/black</item>
    <item name="android:colorPrimaryDark">@color/black</item>
    <item name="android:textColorPrimary">@color/white</item>
    <item name="android:colorAccent">@color/white</item>
    <item name="android:color">@color/white</item>
    <item name="android:windowBackground">@color/black</item>
    <item name="android:navigationBarColor">@color/black</item>
    <item name="android:actionBarStyle">@color/black</item>
</style>

Answer 1

SIMPLEST SOLUTION

You can enable/disable dark theme just by:

1. enable dark theme:

   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
   

2. forcefully disable dark theme:

   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
   

3. set app theme based on mobile settings of dark mode, i.e. if dark mode is enabled then the theme will be set to a dark theme, if not then the default theme, but this will only work in version >= Android version Q

   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
   

Notes:

1. Your base theme for app/activity should be

"Theme.AppCompat.DayNight"

like

<style name="DarkTheme" parent="Theme.AppCompat.DayNight">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
</style>

2. Your res folder's names would end with -night so that different colors and images you can set for day and night themes like

drawable & drawable-night,
values & values-night