The provider is destroyed when autodispose is not used

[wilson-orz]

My application uses the StateNotifierProvider to save login user information and watch it somewhere, but the notifier sometimes gets destroyed when the application sleeps for a long time

[wilson-orz]

final mainTabIndexProvider = Provider((ref) => PageController());

class MainTab extends ConsumerStatefulWidget {
  const MainTab({super.key});

  @override
  ConsumerState<MainTab> createState() => _MainTabState();
}

class _MainTabState extends ConsumerState<MainTab> {

  final barItemData = [
    {
      "name": "首页",
      "icon": "assets/svg/module/main/icon_main.svg",
      "selectedIcon": "assets/svg/module/main/icon_main_s.svg"
    },
    {
      "name": "发布",
      "icon": "assets/svg/module/main/icon_plus.svg",
      "selectedIcon": "assets/svg/module/main/icon_plus_s.svg"
    },
    {
      "name": "商城",
      "icon": "assets/svg/module/main/icon_shop.svg",
      "selectedIcon": "assets/svg/module/main/icon_shop_s.svg"
    },
    {
      "name": "我的",
      "icon": "assets/svg/module/main/icon_mine.svg",
      "selectedIcon": "assets/svg/module/main/icon_mine_s.svg"
    }
  ];

  late final pages = [const HomePage(), const PublishPage(), ShopWebPage(), const PersonalHomepage()];

  late final tabIndexProvider = StateProvider((ref) => 0);

  @override
  void initState() {
    super.initState();
    ref.read(mainTabIndexProvider).addListener(() {
      if (ref.read(mainTabIndexProvider).hasClients) {
        MyApp.refRead(tabIndexProvider.notifier).state = ref.read(mainTabIndexProvider).page!.round();
      }
    });
  }

  @override
  void dispose() {
    AppNotificationCenter.defaultCenter().removerObserver(target: this);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      bottomNavigationBar: Consumer(
        builder: (_, WidgetRef ref, __) {
          final index = ref.watch(tabIndexProvider);
          final hasCount = ref.watch(userProfileProvider.select((value) => value.hasCount));
          return BottomNavigationBar(
            onTap: (idx) {
              if (barItemData[idx]["name"] == "发布" || barItemData[idx]["name"] == "我的") {
                if (!MyApp.refRead(userProfileProvider.notifier).checkIsLogin(isExitLogin: true)) {
                  return;
                }
              }
              ref.read(mainTabIndexProvider).jumpToPage(idx);
            },
            currentIndex: index,
            items: [
              for (int i = 0; i < barItemData.length; i++)
                BottomNavigationBarItem(
                    activeIcon: _buildBottomIcon(barItemData[i]["selectedIcon"]!,
                        hasDot: i == barItemData.length - 1 && hasCount),
                    icon: _buildBottomIcon(barItemData[i]["icon"]!, hasDot: i == barItemData.length - 1 && hasCount),
                    label: barItemData[i]["name"]!),
            ],
            selectedLabelStyle: const TextStyle(fontSize: 10, fontWeight: FontWeight.bold, color: Colors.black),
            unselectedLabelStyle: const TextStyle(fontSize: 10, fontWeight: FontWeight.bold, color: Colors.black),
            showUnselectedLabels: true,
            showSelectedLabels: true,
            selectedItemColor: Colors.black,
            unselectedItemColor: const Color(0xFFCDCDCD),
            type: BottomNavigationBarType.fixed,
          );
        },
      ),
      body:  Consumer(
          builder: (_, WidgetRef ref, __) {
            return PageView(
              controller: ref.read(mainTabIndexProvider),
              physics: const NeverScrollableScrollPhysics(),
              children: pages,
            );
          },
        ),
    );
  }

}

[wilson-orz]

When I use ref.read(mainTabIndexProvider), I can get the PageController, but wait a long time. ref.read(mainTabIndexProvider) gets a destroy error

[rrousselGit]

What's a "destroy error"?

Could you share a minimal reproducible sample?

If the application sleeps for a long time, it might've been killed by the OS itself. In which case this isn't about Riverpod

[wilson-orz]

sorry my poor english，i means i gets an error that the notifier was disposed，It happens mostly on Android.

[rrousselGit]

What error? :)

[rrousselGit]

In the lack of a reproducible example and clear description of the issue, I'm unable to do anything here. So I'll close this.

Please reopen a new issue if you still have the problem