Disable Dark Mode Programmatically in Android

Question

I want to disable darkmode in app based on a flag Programmatically. I have defined custom colors in the values-night folder for darkmode.

I have tried the following solutions for disabling darkmode but not worked.

AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);

Is there any way to disable darkmode programmatically without removing values-night folder?

Answer 1

Seems like you don't define the correct theme color. But check the below solution:

Kt.

 val mode = if ((resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK) ==
                    Configuration.UI_MODE_NIGHT_NO
                ) {
                    AppCompatDelegate.MODE_NIGHT_YES
                } else {
                    AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY
                }

            AppCompatDelegate.setDefaultNightMode(mode)

Colors.xml

Create a separate color file having root /values-night/color.xml and define all those colors that u already defined in /values/color.xml with your new night-theme-color codes.

Themes.xml

In /values/themes.xml define your style:

<style name="Theme.VehicleApp" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
    <!-- Primary brand color. -->
    <item name="colorPrimary">@color/purple_700</item>
    <item name="colorPrimaryVariant">@color/purple_700</item>
    <item name="colorOnPrimary">@color/white</item>

    <!-- All your theme stuff -->

    </style>

and in your /values-night/themes.xml define only those style that you want to look change in night mode otherwise don't define the same style fields that u already defined in values/themes.xml, the rest of the color manipulation work will be done by color file itself :

   <style name="Theme.VehicleApp" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
    
    <!-- Customize your theme here. -->

   </style>

Answer 2

Every time you want to change the mode from light to night mode you have to call (Don't need now, calling setDefaultNightMode is enough)

//setContentView(R.layout.YOUR_LAYOUT_NAME_FOR_THE_ACTIVITY); //this is also called in the onCreate() method

So these functions would change the theme:

private void setThemeDark(){
    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
    //setContentView(R.layout.YOUR_LAYOUT_NAME_FOR_THE_ACTIVITY);
}

private void setThemeLight(){
    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
    //setContentView(R.layout.YOUR_LAYOUT_NAME_FOR_THE_ACTIVITY);
}

From AppCompat v1.1.0-alpha05 onwards, setDefaultNightMode() will automatically apply any DayNight changes to any ‘started’ Activities. This means that you no longer have to manually recreate any Activities when you call the API.