added amoled dark mode

lib/main.dart

@@ -37,7 +37,10 @@ class MyApp extends StatelessWidget {
         builder: (ctx) => MaterialApp(
           title: 'Flutter Demo',
           themeMode: ctx.watch<ConfigStore>().theme,
-          darkTheme: ThemeData.dark(),
+          darkTheme: ThemeData.dark().copyWith(
+              scaffoldBackgroundColor: ctx.watch<ConfigStore>().amoledDarkMode
+                  ? Colors.black
+                  : null),
           theme: ThemeData(
             visualDensity: VisualDensity.adaptivePlatformDensity,
           ),

lib/pages/settings.dart

@@ -70,6 +70,12 @@ class _AppearanceConfig extends StatelessWidget {
                   ctx.read<ConfigStore>().theme = selected;
                 },
               ),
+            SwitchListTile(
+                title: Text('Amoled dark mode'),
+                value: ctx.watch<ConfigStore>().amoledDarkMode,
+                onChanged: (checked) {
+                  ctx.read<ConfigStore>().amoledDarkMode = checked;
+                })
           ],
         ),
       ),

lib/stores/config_store.dart

@@ -12,7 +12,7 @@ abstract class _ConfigStore with Store {
 
   _ConfigStore() {
     // persitently save settings each time they are changed
-    _saveReactionDisposer = reaction((_) => [theme], (_) {
+    _saveReactionDisposer = reaction((_) => [theme, amoledDarkMode], (_) {
       save();
     });
   }
@@ -25,18 +25,21 @@ abstract class _ConfigStore with Store {
     var prefs = await SharedPreferences.getInstance();
     // load saved settings or create defaults
     theme = _themeModeFromString(prefs.getString('theme') ?? 'system');
+    amoledDarkMode = prefs.getBool('amoledDarkMode') ?? false;
   }
 
   void save() async {
     var prefs = await SharedPreferences.getInstance();
 
     await prefs.setString('theme', describeEnum(theme));
+    await prefs.setBool('amoledDarkMode', amoledDarkMode);
   }
 
   @observable
   ThemeMode theme;
 
-  // TODO: add amoledDarkMode switch
+  @observable
+  bool amoledDarkMode;
 }
 
 ThemeMode _themeModeFromString(String theme) =>

lib/stores/config_store.g.dart

@@ -24,10 +24,26 @@ mixin _$ConfigStore on _ConfigStore, Store {
     });
   }
 
+  final _$amoledDarkModeAtom = Atom(name: '_ConfigStore.amoledDarkMode');
+
+  @override
+  bool get amoledDarkMode {
+    _$amoledDarkModeAtom.reportRead();
+    return super.amoledDarkMode;
+  }
+
+  @override
+  set amoledDarkMode(bool value) {
+    _$amoledDarkModeAtom.reportWrite(value, super.amoledDarkMode, () {
+      super.amoledDarkMode = value;
+    });
+  }
+
   @override
   String toString() {
     return '''
-theme: ${theme}
+theme: ${theme},
+amoledDarkMode: ${amoledDarkMode}
     ''';
   }
 }