试图调用 Provider.of<dynamic> . 这可能是一个错误，因此不受支持</dynamic>

Question

Trying to get and text current user's uid but facing the error with Provider implementation.

Tried to call Provider.of. This is likely a mistake and is therefore unsupported. If you want to expose a variable that can be anything, consider changing dynamic to Object instead. 'package:provider/src/provider.dart': Failed assertion: line 307 pos 7: 'T != dynamic'

Here's the code where provider is used

 return SingleChildScrollView(
      child: Column(
        children: [
          FutureBuilder(
              future: Provider.of(context, listen: false).auth.getCurrentUid(),
              builder: (context, snapshot) {
                if (snapshot.connectionState == ConnectionState.done) {
                  return Text("${snapshot.data}");
                } else {
                  return CircularProgressIndicator();
                }
              })
        ],
      ),
    );

function to get current uid

//GET UID
  Future<String> getCurrentUid() async {
    return _auth.currentUser.uid;
  }

How can i fix this? Really appreciate any help. Thank you in advance.

Answer 1

Just replace

future: Provider.of(context, listen: false).auth.getCurrentUid(),

with

future: Provider.of<YOUR_PROVIDER_CLASSNAME>(context, listen: false).auth.getCurrentUid(),

and your should be fine.

The only moment you can use Provider.of without specifying the Class that should be provided, is when you're initializing a variable of your provider.

MyProvider _myProvider = Provider.of(context, listen: false);

Answer 2

Just tell the provider which type of "Provider" class is it.

future: Provider.of<CLASSNAME>(context, listen: false).auth.getCurrentUid(),

Answer 3

I had same issue, the fixed by adding the (Provider Class/ change notifire class) to the provider list which I forgot:). In my case, my provider class was "Counter".

void main() {
  runApp(
    ///mocking the providers
    MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (_) => Counter()),
      ],
      child: const MyApp(),
    ),
  );
}