update after show causes widget not mounted crash

[zmabies]

Using update method after show method causes the following crash error:
Unhandled Exception: setState() called in constructor: (lifecycle state: created, no widget, not mounted) This happens when you call setState() on a State object for a widget that hasn't been inserted into the widget tree yet. It is not necessary to call setState() in the constructor, since the state is already assumed to be dirty when it is initially created.

To Reproduce
Steps to reproduce the behavior:

1. declare ProgressDialog and initialize in build
2. show dialog
3. update dialog
4. hide dialog
5. repeat steps 2-4 until it crashes

[tiagooliveira1]

Me too.

[fayaz07]

Hi, can you post sample code which I can use to test.

[zmabies]

Hello @fayaz07

please see this repo for the code:
https://github.com/zmabies/ProgressDialogTest

[fayaz07]

if you would like to show the dialog, when the widget is initalised, use this code

void main() => runApp(MaterialApp(home: MyApp()));

  class MyApp extends StatefulWidget {
    @override
    _MyAppState createState() => _MyAppState();
  }

  class _MyAppState extends State<MyApp> {

    ProgressDialog progressDialog;

    @override
    Widget build(BuildContext context) {
      progressDialog = ProgressDialog(context);
      WidgetsBinding.instance.addPostFrameCallback((Duration d){
        progressDialog.show();
      });
      return Scaffold(

      );
    }
  }

[fayaz07]

Hello @fayaz07

please see this repo for the code:
https://github.com/zmabies/ProgressDialogTest

this didn't give me any issue

[zmabies]

Hello @fayaz07
please see this repo for the code:
https://github.com/zmabies/ProgressDialogTest

this didn't give me any issue

Did you test it with the navigation from home class in main?

[zmabies]

if you would like to show the dialog, when the widget is initalised, use this code

void main() => runApp(MaterialApp(home: MyApp()));

  class MyApp extends StatefulWidget {
    @override
    _MyAppState createState() => _MyAppState();
  }

  class _MyAppState extends State<MyApp> {

    ProgressDialog progressDialog;

    @override
    Widget build(BuildContext context) {
      progressDialog = ProgressDialog(context);
      WidgetsBinding.instance.addPostFrameCallback((Duration d){
        progressDialog.show();
      });
      return Scaffold(

      );
    }
  }

this isn't the issue

[zmabies]

Hello @fayaz07, any updates?

[furkankurt]

Still same?

[furkankurt]

@fayaz07 unfortunately issue isn't resolved. Not always but sometimes I get the error and crash.
I/flutter (18088): ProgressDialog shown E/flutter (18088): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method 'update' was called on null. E/flutter (18088): Receiver: null E/flutter (18088): Tried calling: update() E/flutter (18088): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5) E/flutter (18088): #1 ProgressDialog.update (package:progress_dialog/progress_dialog.dart:83:29) E/flutter (18088): #2 _EsyaIlaniEkleState.resimYukle.<anonymous closure> (package:ogrencievi/lists/post/post_esya_ilani.dart:465:18) E/flutter (18088): #3 _rootRun (dart:async/zone.dart:1122:38) E/flutter (18088): #4 _CustomZone.run (dart:async/zone.dart:1023:19) E/flutter (18088): #5 _CustomZone.runGuarded (dart:async/zone.dart:925:7) E/flutter (18088): #6 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965:23) E/flutter (18088): #7 _rootRun (dart:async/zone.dart:1126:13) E/flutter (18088): #8 _CustomZone.run (dart:async/zone.dart:1023:19) E/flutter (18088): #9 _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:949:23) E/flutter (18088): #10 Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:23:15) E/flutter (18088): #11 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:398:19) E/flutter (18088): #12 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:429:5) E/flutter (18088): #13 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12) E/flutter (18088):

[fayaz07]

Hi everyone, please use await for showing and hiding the dialog just as

await pr.show();
... your code
await pr.hide();