Re: How to use flutter provider in a statefulWidget?

[Ian B]

Have you tried what the error message tells you to do :) ? I.e

>

To fix, write:

Provider.of<GirisSonucApiViewModel>(context, listen: false);

On Thu, Jun 11, 2020 at 12:27 PM Gökçen Merve Horuk <gokcenme...@gmail.com> wrote:

class GirisSayfasi extends StatefulWidget {

  @override
  _GirisSayfasiState createState() => _GirisSayfasiState();
}

class _GirisSayfasiState extends State<GirisSayfasi>{

  GirisSonucApiViewModel _girisSonucApiViewModel;


..............
........




@override
Widget build(BuildContext context) {
  _girisSonucApiViewModel = Provider.of<GirisSonucApiViewModel>(context);
  return Scaffold(
    key: _scaffoldKey,
    appBar: AppBar(
      title: Text("Login"),
      elevation: 3,
    ),
    body: Stack(
      fit: StackFit.expand,
      children: <Widget>[
        Container(
          decoration: BoxDecoration(
            image: DecorationImage(
                image: AssetImage("assets/images/blu.jpg"),
                fit: BoxFit.cover),
          ),

...................

════════ Exception caught by gesture ═══════════════════════════════════════════════════════════════

The following assertion was thrown while handling a gesture:

Tried to listen to a value exposed with provider, from outside of the widget tree.

This is likely caused by an event handler (like a button's onPressed) that called

Provider.of without passing `listen: false`.

To fix, write:

Provider.of<GirisSonucApiViewModel>(context, listen: false);

It is unsupported because may pointlessly rebuild the widget associated to the

event handler, when the widget tree doesn't care about the value.

The context used was: GirisSayfasi(state: _GirisSayfasiState#0d424)

'package:provider/src/provider.dart':

Failed assertion: line 191 pos 7: 'context.owner.debugBuilding ||

          listen == false ||

          debugIsInInheritedProviderUpdate'

When the exception was thrown, this was the stack: 

#2      Provider.of (package:provider/src/provider.dart:191:7)

#3      _GirisSayfasiState.build.<anonymous closure> (package:flutterbizebildirprovider/widget/giris.dart:180:66)

#4      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:779:19)

#5      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:862:36)

#6      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)

...

Handler: "onTap"

Recognizer: TapGestureRecognizer#ed663

  debugOwner: GestureDetector

  state: possible

  won arena

  finalPosition: Offset(219.8, 441.1)

  finalLocalPosition: Offset(89.1, 22.1)

  button: 1

  sent tap down

════════════════════════════════════════════════════════════════════════════════════════════════════

Hello,

I am trying to use the provider in the Statefull widget and this way I get an error. I want to call and use the function via viewModel, but currently I am unable to progress due to this error. I would be very glad if you could help.

Best regards

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