如何在下面这段代码中将 OrdeilistProvider 添加到 MultiProvider 中：class Tabs extends StatefulWidget { const Tabs({super.key}); @override State<Tabs> createState() => _TabsState(); } class _TabsState extends State<Tabs> { int _currentIndex = 0; final List<Widget> pages = [ HomePage( key: homePageKey, ), const OrderPage(), const ProfilePage() ]; @override Widget build(BuildContext context) { return Scaffold( body: IndexedStack( index: _currentIndex, children: pages, ), bottomNavigationBar: BottomNavigationBar( currentIndex: _currentIndex, type: BottomNavigationBarType.fixed, onTap: (index) { setState(() { _currentIndex = index; }); if (_currentIndex == 0) { homePageKey.currentState!.toMyLocation(); } }, items: const [ BottomNavigationBarItem(icon: Icon(Icons.home), label: ''), // BottomNavigationBarItem(icon: Icon(Icons.gas_meter), label: ''), BottomNavigationBarItem(icon: Icon(Icons.note_alt), label: ''), BottomNavigationBarItem(icon: Icon(Icons.person), label: ''), ], ), ); } }

可以使用 MultiProvider 包裹整个 MaterialApp，并将 OrdeilistProvider 添加到 providers 列表中，如下所示：

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (_) => OrdeilistProvider()),
      ],
      child: MaterialApp(
        title: 'My App',
        home: const Tabs(),
      ),
    );
  }
}

class Tabs extends StatefulWidget {
  const Tabs({Key? key}) : super(key: key);

  @override
  State<Tabs> createState() => _TabsState();
}

class _TabsState extends State<Tabs> {
  int _currentIndex = 0;
  final List<Widget> pages = [
    HomePage(
      key: homePageKey,
    ),
    const OrderPage(),
    const ProfilePage()
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: IndexedStack(
        index: _currentIndex,
        children: pages,
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        type: BottomNavigationBarType.fixed,
        onTap: (index) {
          setState(() {
            _currentIndex = index;
          });
          if (_currentIndex == 0) {
            homePageKey.currentState!.toMyLocation();
          }
        },
        items: const [
          BottomNavigationBarItem(icon: Icon(Icons.home), label: ''),
          // BottomNavigationBarItem(icon: Icon(Icons.gas_meter), label: ''),
          BottomNavigationBarItem(icon: Icon(Icons.note_alt), label: ''),
          BottomNavigationBarItem(icon: Icon(Icons.person), label: ''),
        ],
      ),
    );
  }
}