CODEWITHSUNDEEP
flutterdart
Kasun Weerawarna
Kasun Weerawarna

Reputation: 51

Error when ChangeNotifierProvider and MaterialPageRoute used together

            A a = await createA();
            ...
            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) =>
                    ChangeNotifierProvider<A>.value(
                  value: a,
                  child: const NewPage(),
                ),
              ),
            );

When I try to use object 'a' as below inside the build function of the NewPage, I am getting below error. Anything wrong with what am I doing?

           context.watch<A>()

Error: Could not find the correct Provider above this NewPage Widget

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

Upvotes: 1

Views: 541

Answers (1)

呂學洲
呂學洲

Reputation: 1413

It is because you are using child in provider, which means the widget won't build upon the provider.

You should use builder:

ChangeNotifierProvider<A>.value(
  value: a,
  builder: (context, child) => const NewPage(),
);

Now the provider are able to inject the dependency(A), and rebuild your desired widget(NewPage) with the correct context.

Upvotes: 1

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