ProviderNotFoundException

[pitanni]

Hello everyone, I have a problem with the library. I created an abstract class to handle connectivity across multiple pages in the same way. But I'm getting the error:

`════════ Exception caught by widgets library ═══════════════════════════════════
The following ProviderNotFoundException was thrown building StreamBuilder(state: _StreamBuilderBaseState<ConnectivityResult, AsyncSnapshot>#ab4f1):
Error: Could not find the correct Provider<StateStreamable<Object?>> above this BlocBuilder<StateStreamable<Object?>, Object?> Widget

This happens because you used a BuildContext that does not include the provider
of your choice. There are a few common scenarios:

• You added a new provider in your main.dart and performed a hot-reload.
  To fix, perform a hot-restart.

• The provider you are trying to read is in a different route.

  Providers are "scoped". So if you insert of provider inside a route, then
  other routes will not be able to access that provider.

• You used a BuildContext that is an ancestor of the provider you are trying to read.

  Make sure that BlocBuilder<StateStreamable<Object?>, Object?> is under your MultiProvider/Provider<StateStreamable<Object?>>.
  This usually happens when you are creating a provider and trying to read it immediately.

  For example, instead of:

  Widget build(BuildContext context) {
    return Provider<Example>(
      create: (_) => Example(),
      // Will throw a ProviderNotFoundError, because `context` is associated
      // to the widget that is the parent of `Provider<Example>`
      child: Text(context.watch<Example>().toString()),
    );
  }
  

  consider using builder like so:

  Widget build(BuildContext context) {
    return Provider<Example>(
      create: (_) => Example(),
      // we use `builder` to obtain a new `BuildContext` that has access to the provider
      builder: (context, child) {
        // No longer throws
        return Text(context.watch<Example>().toString());
      }
    );
  }
  

If none of these solutions work, consider asking for help on StackOverflow:
https://stackoverflow.com/questions/tagged/flutter

The relevant error-causing widget was:
OfflineBuilder OfflineBuilder:file:///C:/..../glufri/lib/widgets/connectivity_widget.dart:9:41

When the exception was thrown, this was the stack:
#0 Provider._inheritedElementOf (package:provider/src/provider.dart:343:7)
#1 Provider.of (package:provider/src/provider.dart:293:30)
#2 ReadContext.read (package:provider/src/provider.dart:649:21)
#3 _BlocBuilderBaseState.initState (package:flutter_bloc/src/bloc_builder.dart:130:36)
#4 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:5611:55)
#5 ComponentElement.mount (package:flutter/src/widgets/framework.dart:5456:5)
#6 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4335:16)
#7 Element.updateChild (package:flutter/src/widgets/framework.dart:3840:20)
#8 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5505:16)
#9 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5643:11)
#10 Element.rebuild (package:flutter/src/widgets/framework.dart:5196:7)
#11 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2904:19)
#12 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:989:21)
#13 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:448:5)
#14 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1386:15)
#15 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1311:9)
#16 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1169:5)
#17 _invoke (dart:ui/hooks.dart:312:13)
#18 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:399:5)
#19 _drawFrame (dart:ui/hooks.dart:283:31)
`

[pitanni]

My code of widgets/connectivity_widget.dart is:

`
import 'package:app_settings/app_settings.dart';
import 'package:flutter/material.dart';
import 'package:flutter_offline/flutter_offline.dart';

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

@OverRide
Widget build(BuildContext context) => OfflineBuilder(
connectivityBuilder: (context, connectivity, child) =>
connectivity == ConnectivityResult.none ? disconnectedBuild(context) : child,
child: connectedBuild(context)
);

Widget connectedBuild(BuildContext context);

Widget disconnectedBuild(BuildContext context) => Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Icon(
Icons.wifi_off,
size: 128,
color: Colors.grey,
),
Text("Oh no!"),
Text("Nessuna connessione disponibile!"),
Padding(
padding: EdgeInsets.only(top: 24),
child: ElevatedButton(
onPressed: () => AppSettings.openAppSettings(),
child: Text("Impostazioni"),
),
),
],
),
),);
}
`