bug(YouTube - Theme): Fix white system navigation bar in the ReVanced settings (#4875)

extensions/youtube/src/main/java/app/revanced/extension/youtube/ThemeHelper.java

@@ -2,6 +2,8 @@ package app.revanced.extension.youtube;
 
 import android.app.Activity;
 import android.graphics.Color;
+import android.os.Build;
+import android.view.Window;
 
 import androidx.annotation.Nullable;
 
@@ -102,4 +104,21 @@ public class ThemeHelper {
 
         return Utils.getColorFromString(colorName);
     }
+
+    /**
+     * Sets the system navigation bar color for the activity.
+     * Applies the background color obtained from {@link #getBackgroundColor()} to the navigation bar.
+     * For Android 10 (API 29) and above, enforces navigation bar contrast to ensure visibility.
+     */
+    public static void setNavigationBarColor(@Nullable Window window) {
+        if (window == null) {
+            Logger.printDebug(() -> "Cannot set navigation bar color, window is null");
+            return;
+        }
+
+        window.setNavigationBarColor(getBackgroundColor());
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            window.setNavigationBarContrastEnforced(true);
+        }
+    }
 }

extensions/youtube/src/main/java/app/revanced/extension/youtube/settings/LicenseActivityHook.java

@@ -84,6 +84,7 @@ public class LicenseActivityHook {
     public static void initialize(Activity licenseActivity) {
         try {
             ThemeHelper.setActivityTheme(licenseActivity);
+            ThemeHelper.setNavigationBarColor(licenseActivity.getWindow());
             licenseActivity.setContentView(getResourceIdentifier(
                     "revanced_settings_with_toolbar", "layout"));
 
@@ -126,7 +127,7 @@ public class LicenseActivityHook {
         // This is required to fix submenu title alignment issue with Android ASOP 15+
         ViewGroup toolBarParent = activity.findViewById(
                 getResourceIdentifier("revanced_toolbar_parent", "id"));
-        ViewGroup dummyToolbar = Utils.getChildViewByResourceName(toolBarParent,"revanced_toolbar");
+        ViewGroup dummyToolbar = Utils.getChildViewByResourceName(toolBarParent, "revanced_toolbar");
         toolbarLayoutParams = dummyToolbar.getLayoutParams();
         toolBarParent.removeView(dummyToolbar);
 
@@ -149,5 +150,4 @@ public class LicenseActivityHook {
 
         toolBarParent.addView(toolbar, 0);
     }
-
 }

extensions/youtube/src/main/java/app/revanced/extension/youtube/settings/preference/ReVancedPreferenceFragment.java

@@ -138,6 +138,9 @@ public class ReVancedPreferenceFragment extends AbstractPreferenceFragment {
                                     .findViewById(android.R.id.content)
                                     .getParent();
 
+                            // Fix the system navigation bar color for submenus.
+                            ThemeHelper.setNavigationBarColor(preferenceScreenDialog.getWindow());
+
                             // Fix edge-to-edge screen with Android 15 and YT 19.45+
                             // https://developer.android.com/develop/ui/views/layout/edge-to-edge#system-bars-insets
                             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {