How to set specific fragment to only Dark theme while rest of the app is DayNight?


This Content is from Stack Overflow. Question asked by Marat

In my app I have one fragment where I need to use colors only from dark theme pallet.

My base AppTheme is extending from DayNight and I have colors.xml in both values and values-night folder with different hex colors for light and dark themes.

<style name="AppTheme" parent="Theme.MaterialComponents.DayNight.NoActionBar">
    <item name="android:windowBackground">@color/surfacePrimary</item>
    <item name="colorPrimary">@color/surfacePrimary</item>
    <item name="colorPrimaryDark">@color/surfacePrimary</item>

In this article from Chris Banes I found out that DayNight is basicaly

in values:
<style name="Theme.AppCompat.DayNight" parent="Theme.AppCompat.Light" />

and in values-night:
<style name="Theme.AppCompat.DayNight" parent="Theme.AppCompat" />

I tried to create a separate AppTheme that doesn’t extend from DayNight with hope that this theme will use colors from values-night folder.

<style name="AppTheme.Dark" parent="Theme.MaterialComponents.NoActionBar">
    <item name="android:windowBackground">@color/surfacePrimary</item>
    <item name="colorPrimary">@color/surfacePrimary</item>
    <item name="colorPrimaryDark">@color/surfacePrimary</item>

As you can see color attributes still points to the same colors in both themes but those colors have different hex in values/colors.xml and values-night/colors.xml. Then applied Dark theme in onCreateView of needed fragment:

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    activity?.theme?.applyStyle(, true)
    return inflater.inflate(R.layout.fragment_b, container, false)

But this did not work out. I know that I could add separate independent colors just for this fragment and set their hex to be always equal to one in dark mode. But I would really like to avoid it and use already existing colors I have.

How can I force AppTheme.Dark to use colors from values-night/colors.xml?


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