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lib/services/theme_mode_helper.dart

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+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:hive_flutter/hive_flutter.dart';
+
+/// A helper for setting the theme, like FinampSettingsHelper. We don't do theme
+/// stuff in FinampSettingsHelper as we would have to rebuild the MaterialApp on
+/// every setting change.
+class ThemeModeHelper {
+  static ValueListenable<Box<ThemeMode>> get themeModeListener =>
+      Hive.box<ThemeMode>("ThemeMode").listenable(keys: ["ThemeMode"]);
+
+  static void setThemeMode(ThemeMode themeMode) {
+    Hive.box<ThemeMode>("ThemeMode").put("ThemeMode", themeMode);
+  }
+}