feat:增加主题色模块

lib/main.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:food_hub_app/provider/food_provider.dart';
+import 'package:food_hub_app/provider/theme_provider.dart';
 import 'package:food_hub_app/utils/sp_util.dart';
 import 'package:food_hub_app/views/home.dart';
 import 'package:food_hub_app/views/login.dart';
@@ -18,6 +19,7 @@ void main() async {
     MultiProvider(
       providers: [
         ChangeNotifierProvider(create: (context) => FoodProvider()),
+        ChangeNotifierProvider(create: (context) => ThemeProvider()),
       ],
       child: MyApp(),
     ),
@@ -30,9 +32,11 @@ class MyApp extends StatelessWidget {
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {
+    final themeProvider = context.watch<ThemeProvider>();
+
     return MaterialApp(
       debugShowCheckedModeBanner: false,
-      theme: ThemeData(fontFamily: 'CustomFont'),
+      theme: themeProvider.currentThemeData,
       supportedLocales: const [
         Locale('en', 'US'), // 英语
         Locale('zh', 'CN'), // 中文