Re: How to display a dialog after page loads using showDialog

[Eugenio Tesio]

Try this:

    @override
    Widget build(BuildContext context)
    {
        showDialog(context: context, builder:(BuildContext context){ return  myWidgets.getBusyDialog();});
        return new Scaffold(
            body: new Container(
                child: new Column(
                    children: <Widget>[
                        new Text(getText()),
                    ],
                    ),
                ),
            );

    }

El lun., 14 may. 2018 a las 22:16, Adam Zedan (<zeda...@gmail.com>) escribió:

I would like to display a dialog using showDialog as soon as the page loads. 

I currently have something like this 

class TestActive extends StatefulWidget
{
    TestActive();

    @override
    TestActiveState createState() => new TestActiveState();
}

class TestActiveState extends State<TestActive> with SingleTickerProviderStateMixin,CommonMixin
{

    TestActiveState()
    {

    }

    @override
    void initState()
    {
        super.initState();
    }

    @override
    void dispose() {
        super.dispose();
    }

    String getText()
    {
        showDialog(context: context, builder:(BuildContext context){ return  myWidgets.getBusyDialog();});
        return "Hello";
    }

    @override
    Widget build(BuildContext context)
    {
        return new Scaffold(
            body: new Container(
                child: new Column(
                    children: <Widget>[
                        new Text(getText()),
                    ],
                    ),
                ),
            );

    }
}

In the above code I get the error :

flutter: The following assertion was thrown building TestActive(dirty, state: TestActiveState#c01af):

flutter: setState() or markNeedsBuild() called during build.

flutter: This Overlay widget cannot be marked as needing to build because the framework is already in the

flutter: process of building widgets. A widget can be marked as needing to be built during the build phase

flutter: only if one of its ancestors is currently building. This exception is allowed because the framework

flutter: builds parent widgets before children, which means a dirty descendant will always be built.

flutter: Otherwise, the framework might not visit this widget during this build phase.

flutter: The widget on which setState() or markNeedsBuild() was called was:

flutter:   Overlay-[LabeledGlobalKey<OverlayState>#96e49](state: OverlayState#7aab6(entries:

flutter:   [OverlayEntry#ff9bb(opaque: false; maintainState: false), OverlayEntry#ee5ca(opaque: false;

--
You received this message because you are subscribed to the Google Groups "Flutter Dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email to flutter-dev...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--

Eugenio Tesio

Zetus - Soluciones Empresariales

División Sistemas

eug...@zetus.com.ar

eug...@atto.com.ar

(+549) 3564-15-599945

San Francisco - 2400

Pcia de Córdoba - Argentina

Google MyBusiness