flutter-provider

How to access Provider providers in Dialogs in Flutter

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Instead of passing the BLoC in the constructor, you can make use of BlocProvider.value. https://pub.dev/documentation/flutter_bloc/latest/flutter_bloc/BlocProvider/BlocProvider.value.html This will allow you to provide your existing BLoC instance to your new route (the dialog). And you still get all the benefits of InheritedWidget // Get the BLoC using the provider MyBloc myBloc = BlocProvider.of<MyBloc>(context); showDialog( context: context, builder: … Read more

How to access Provided (Provider.of()) value inside showModalBottomSheet?

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InheritedWidgets, and therefore Providers, are scoped to the widget tree. They cannot be accessed outside of that tree. The thing is, using showDialog and similar functions, the dialog is located in a different widget tree – which may not have access to the desired provider. It is therefore necessary to add the desired providers in … Read more

How to access to provider field from class that do not have context?

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You cannot and should not access providers outside of the widget tree. Even if you could theoretically use globals/singletons or an alternative like get_it, don’t do that. You will instead want to use a widget to do the bridge between your provider, and your model. This is usually achieved through the didChangeDependencies life-cycle, like so: … Read more

How to use data from Provider during initState in Flutter application

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You need to use the context to call Provider.of() so you can add addPostFrameCallback() which is called after the first build, there you can use the context @override void initState() { super.initState(); WidgetsBinding.instance.addPostFrameCallback((timeStamp) { auth = Provider.of<Auth>(context, listen: false); }); }

Could not find the correct provider above this widget

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Provider Scope MaterialApp > provider(Screen A) > Screen B If Provider is instantiated in Screen A, it won’t be accessible in Screen B after a Navigator.push from A → B. Why? Because Provider is an InheritedWidget and Navigator uses MaterialApp context outside its Screen A context scope. (See Details below.) Fix Moving Provider up to … Read more

Flutter Provider setState() or markNeedsBuild() called during build

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You are calling fetchEvents from within your build code for the root widget. Within fetchEvents, you call notifyListeners, which, among other things, calls setState on widgets that are listening to the event provider. This is a problem because you cannot call setState on a widget when the widget is in the middle of rebuilding. Now … Read more

Why can’t I use context.read in build(), but I can use Provider.of with listen: false?

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context.read is not allowed inside build because it is very dangerous to use there, and there are much better solutions available. Provider.of is allowed in build for backward-compatibility. Overall, the reasoning behind why context.read is not allowed inside build is explained in its documentation: DON’T call [read] inside build if the value is used only … Read more

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