Flutter: ListView in a SimpleDialog

avatar
1147    11 months ago

I want to show a SimpleDialog with ListView.builder in my Flutter app with this code:

showDialog(
  context: context,
  builder: (BuildContext context) {
    return new SimpleDialog(
      children: <Widget>[
        new FittedBox(
          child: new ListView(
            children: <Widget>[
              new Text("one"),
              new Text("two"),
            ],
          ),
        )
      ],
    );
  },
);

which gives this error (sorry, I couldn't wrap the logs as code because Stackoverflow complains that there's too much code):

══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════ I/flutter ( 4481): The following assertion was thrown during performLayout(): I/flutter ( 4481): RenderViewport does not support returning intrinsic dimensions. I/flutter ( 4481): Calculating the intrinsic dimensions would require instantiating every child of the viewport, which I/flutter ( 4481): defeats the point of viewports being lazy. I/flutter ( 4481): If you are merely trying to shrink-wrap the viewport in the main axis direction, consider a I/flutter ( 4481): RenderShrinkWrappingViewport render object (ShrinkWrappingViewport widget), which achieves that I/flutter ( 4481): effect without implementing the intrinsic dimension API. I/flutter ( 4481): ... I/flutter ( 4481): Another exception was thrown: RenderBox was not laid out: RenderPhysicalShape#83d92 relayoutBoundary=up2 NEEDS-PAINT I/flutter ( 4481): Another exception was thrown: 'package:flutter/src/rendering/shifted_box.dart': Failed assertion: line 310 pos 12: 'child.hasSize': is not true. I/flutter ( 4481): Another exception was thrown: RenderBox was not laid out: RenderPhysicalShape#83d92 relayoutBoundary=up2

I tried using Container with specific height and width, and it works, but I want the ListView to fit itself in the Dialog.

How to include a ListView in a SimpleDialog?

Answers { 1 }
avatar
11 months ago

Just wrap ListView.builder in a Container with a specific height and width.

Widget setupAlertDialoadContainer() {
    return Container(
      height: 300.0, // Change as per your requirement
      width: 300.0, // Change as per your requirement
      child: ListView.builder(
        shrinkWrap: true,
        itemCount: 5,
        itemBuilder: (BuildContext context, int index) {
          return ListTile(
            title: Text('Gujarat, India'),
          );
        },
      ),
    );
  }

And call the above method in showDialog.

showDialog(
   context: context,
   builder: (BuildContext context) {
   return AlertDialog(
       title: Text('Country List'),
       content: getAllSelectedCountry(),
   );
  }
);

EDITED: