new settign button

lib/main.dart

@@ -35,16 +35,30 @@ class MyHomePage extends StatelessWidget {
               style: TextStyle(color: Theme.of(context).accentColor)),
           shadowColor: const Color(0x00000000),
           actions: <Widget>[
-            IconButton(
-              icon: const Icon(Icons.settings),
-              tooltip: 'Show Snackbar',
-              onPressed: () {
-                Navigator.push(
-                  context,
-                  MaterialPageRoute(builder: (context) => SecondRoute()),
-                );
+            PopupMenuButton(
+              itemBuilder: (context) => [
+                const PopupMenuItem(
+                  value: 1,
+                  child: Text("Настройки темы"),
+                ),
+                const PopupMenuItem(
+                  value: 2,
+                  child: Text("Курс валют"),
+                ),
+              ],
+              onSelected: (value) {
+                if (value == 1) {
+                  Navigator.push(
+                    context,
+                    MaterialPageRoute(builder: (context) => SecondRoute()),
+                  );
+                } else {
+                  Navigator.push(
+                    context,
+                    MaterialPageRoute(builder: (context) => CursState()),
+                  );
+                }
               },
-              color: Theme.of(context).accentColor,
             )
           ],
         ),

lib/route.dart

@@ -50,3 +50,52 @@ class _SecondRouteState extends State<SecondRoute> {
     );
   }
 }
+
+class CursState extends StatefulWidget {
+  @override
+  _CursRouteState createState() => _CursRouteState();
+}
+
+class _CursRouteState extends State<CursState> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Курсы валют в рублях",
+            style: TextStyle(color: Theme.of(context).accentColor)),
+        shadowColor: const Color(0x00000000),
+      ),
+      body: Container(
+          color: Theme.of(context).primaryColor,
+          child: Padding(
+            padding: const EdgeInsets.all(8.0),
+            child: ListView(
+              padding: const EdgeInsets.all(8),
+              children: [
+                ListTile(
+                  leading: IconButton(
+                      icon: Icon(
+                        Icons.settings_display,
+                        color: Theme.of(context).accentColor,
+                      ),
+                      onPressed: null),
+                  title: Text(
+                    "Светлая тема",
+                    style: TextStyle(
+                        fontWeight: FontWeight.w500,
+                        color: Theme.of(context).accentColor),
+                  ),
+                  trailing: Switch(
+                    value: Theme.of(context).brightness == Brightness.light,
+                    onChanged: (value) {
+                      Provider.of<ThemeModel>(context, listen: false)
+                          .toggleTheme();
+                    },
+                  ),
+                )
+              ],
+            ),
+          )),
+    );
+  }
+}