dart - Clear state in Flutter when using Provider

Question

How can I clear the current state of my providers manually in my Flutter app? The use case I have is when a user signs out of my app then signs up as a new/different user the previous users state is still stored in the providers, it is cleared automatically when the app is restarted however.

Answer 1

You can use keys to hard-reset the state of a subtree.

And if you want to reset the subtree only partially, you can add a GlobalKey on the top of the other key.

In the end you'll have:

Widget build(BuildContext context) {
  return Provider(
    key: ObjectKey(someIdentifier),
    builder: (_) => Foo(),
    child: SomeSubtree(
      key: GlobalObjectKey(context),
    ),
  );
}

In such case, if someIdentifier changes, the state of Provider will reset but Subtree will be preserved.