Flutter 显示旧错误

Question

I was writing a flutter application but when I want to test it on the Android Emulator (Ctrl+F5) I get an unfixable error. This is part of it:

I/flutter (13782): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (13782): The following assertion was thrown during performResize():
I/flutter (13782): Vertical viewport was given unbounded height.
I/flutter (13782): Viewports expand in the scrolling direction to fill their container. In this case, a vertical
I/flutter (13782): viewport was given an unlimited amount of vertical space in which to expand. This situation
I/flutter (13782): typically happens when a scrollable widget is nested inside another scrollable widget.
I/flutter (13782): If this widget is always nested in a scrollable widget there is no need to use a viewport because
I/flutter (13782): there will always be enough vertical space for the children. In this case, consider using a Column
I/flutter (13782): instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size
I/flutter (13782): the height of the viewport to the sum of the heights of its children.
I/flutter (13782):
I/flutter (13782): The relevant error-causing widget was:
I/flutter (13782):   ListView  (file:///D:/flutterProjects/test_project/test_project/lib/screens/all_obj_screen.dart:19:18)

As you can see in the last line it says the cause of the error is a ListView in D:/flutterProjects/test_project/test_project/lib/screens/all_obj_screen.dart . The problem is that I have no ListView in that file (at the moment, but I had it previously) and that path does not even exist anymore!

If it can help, this is the all_obj_screen.dart file:

class AllObjScreen extends StatefulWidget {
  @override
  _AllObjScreenState createState() => _AllObjScreenState();
}

class _AllObjScreenState extends State<AllObjScreen> {
  @override
  Widget build(BuildContext context) {
    final objects = Provider.of<Objs>(context);

    return Center(
      child: Text(
        '${objects.items.length}',
        style: TextStyle(
          color: Colors.white,
          fontSize: 25,
        ),
      ),
    );
  }
}

So I am thinking that the problem is not my code but something about Visual Studio Code. How to fix this problem?

EDIT: I have tried to run the app on both Visual Studio Code and on Android Studio but the problem is the same. I have also tried to reinstall the IDE and flutter but no luck at all.

Answer 1

I have the same problem since version 1.12. Rebooting device clears logs but I hope Flutter will correct this in future versions. This just happend using android devices. In iOS works correctly.

Answer 2

Try:

flutter logs -c

(to clear logs, run in the project directory)

After cleaning process, then press CTRL + C and answer Y for the question follow. Hope it will help. Thx

Answer 3

The short answer: Delete that device (emulator) and create another new one.

The long story:

I had the same exact issue! The code was perfect and suddenly without any change I get a big list of errors based on events that shouldn't be fired!

I tried flutter clean and it didn't solve the issue and tried everything even I deleted all the code that handles the wrongly fired event and I had no luck with that errors which keep coming again and again while no code to generate them!!.

Until I thought about trying another emulator and the magic happened! No errors!

Answer 4

you can see it: https://github.com/flutter/flutter/issues/46815 . This issue is fixed in flutter version 1.12.13+hotfix8.