initialData. The data that will be used to create the initial snapshot . Providing this value (presumably obtained synchronously somehow when the Stream was created) ensures that the first frame will show useful data.
Read moreWhat is stream subscription Flutter?
A subscription on events from a Stream . When you listen on a Stream using Stream. listen, a StreamSubscription object is returned. The subscription provides events to the listener, and holds the callbacks used to handle the events.
Read moreWhat is a stream provider?
StreamProvider provides, well, Streamed values . Like FutureProvider, provided values will be auto-magically passed the new values of the provided value as they come in. The major difference is that the values will trigger a re-build as many times as it needs to.
Read moreWhat is difference between StreamBuilder and StreamProvider?
StreamProvider is a more complete solution than StreamBuilder : StreamBuilder is a widget that comes with Flutter, and rebuilds itself every time the stream gets updated.
Read moreHow do I initialize a provider in Flutter?
Simply add a constructor in your provider : class StepInfo extends ChangeNotifier { StepInfo() { this. addToList = new VaccStep(); } […] }
Read moreHow do you define a provider in Flutter?
The generics (values inside <> brackets) tell Flutter what type of provider to look for . Then Flutter goes up through the widget tree until it finds the provided value. If the value isn’t provided anywhere then an exception is thrown. Finally, once you’ve got the provider, you can call any method on it.12 Haz 2020
Read moreWhat is a MultiProvider Flutter?
MultiProvider class Null safety A provider that merges multiple providers into a single linear widget tree . It is used to improve readability and reduce boilerplate code of having to nest multiple layers of providers.
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