Flutter: RenderFlex overflow when using column

Question

I'm getting a renderflex overflow error which displays as the following:

It's coming from the following code:

                  return Column(
                      children: [
                        DropdownButton<String>(
                            items: Utils.ddsDropdown
                                .map<DropdownMenuItem<String>>((String value) {
                              return DropdownMenuItem<String>(
                                value: value,
                                child: Text(value),
                              );
                            }).toList(),
                            onChanged: (value) {}),
                        ListView.builder(
                          shrinkWrap: true,
                          padding: const EdgeInsets.fromLTRB(0, 16, 0, 16),
                          itemCount: card.length,
                          itemBuilder: (context, index) {
                            return MyCard.buildCard(card[index], context);
                          },
                        )
                      ],
                    )

I also tried to wrap the column in an Expanded widget and in a SingleChildScrollView but still got the same error. I think the column is preventing the page from being fully scrollable. But I need the column to be able to have the DropdownButton and ListView.

I even tried wrapping the entire widget in a SingleChildScrollView as follows:

        Widget build(BuildContext context) => SingleChildScrollView(
          child: FutureBuilder<List<Map<String, dynamic>>>(
        future: MyCard.getData(widget.categoryIndex, widget.subCategories)!
            .whenComplete(() => setState(() {
                  isLoading = false;
                })),
        builder: ((context, snapshot) {
          if (snapshot.hasData && snapshot.data!.isNotEmpty) {
            return FutureBuilder<List<MyCard>>(
                future: MyCard.readData(snapshot.data),
                builder: (context, cards) {
                  if (cards.hasData) {
                    final card = cards.data!;
                    return Column(
                      children: [
                        //Text("Hello"),
                        DropdownButton<String>(
                            items: Utils.ddsDropdown
                                .map<DropdownMenuItem<String>>((String value) {
                              return DropdownMenuItem<String>(
                                value: value,
                                child: Text(value),
                              );
                            }).toList(),
                            onChanged: (value) {}),
                        ListView.builder(
                          shrinkWrap: true,
                          padding: const EdgeInsets.fromLTRB(0, 16, 0, 16),
                          itemCount: card.length,
                          itemBuilder: (context, index) {
                            return MyCard.buildCard(card[index], context);
                          },
                        )
                      ],
                    );
                  } else {
                    return const Text("No data");
                  }
                });
          } else {
            return isLoading
                ? Column(
                    children: const [CircularProgressIndicator()],
                  )
                : const Text("You do not have any workouts yet");
          }
        }),
      ));

but it still overflows.

The issue was the parent widget. The parent widget was a Column, so I changed it to Center — FlutterBuilder
– FlutterBuilder, Commented Jan 20, 2023 at 17:04

deczaloth · Accepted Answer · 2023-01-20 15:59:36Z

0

Wrap only the ListView in Expanded as follows:

Column(
  children: [
    DropdownButton<String>(
    ...
    Expanded(
      child: ListView.builder(
...

This other answer will provide you with further details about your question.

answered Jan 20, 2023 at 15:59

deczaloth

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2 Comments

FlutterBuilder Over a year ago

I tried that and got an error saying that: RenderFlex children have non-zero flex but incoming height constraints are unbounded.

FlutterBuilder Over a year ago

Solved, the problem is that I was wrapping this widget in a Column.

Ganapathi D · Accepted Answer · 2023-01-20 15:29:11Z

0

Use SingleChildScrollView to use a scrollable area of that column as below:

return SingleChildScrollView(
         child: Column(
                  children: [
                    DropdownButton<String>(
                        items: Utils.ddsDropdown
                            .map<DropdownMenuItem<String>>((String value) {
                          return DropdownMenuItem<String>(
                            value: value,
                            child: Text(value),
                          );
                        }).toList(),
                        onChanged: (value) {}),
                    ListView.builder(
                      shrinkWrap: true,
                      padding: const EdgeInsets.fromLTRB(0, 16, 0, 16),
                      itemCount: card.length,
                      itemBuilder: (context, index) {
                        return MyCard.buildCard(card[index], context);
                      },
                    )
                  ],
                )

I hope this solved your problem.

edited Jan 20, 2023 at 15:29

answered Jan 20, 2023 at 15:28

Ganapathi D

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1 Comment

FlutterBuilder Over a year ago

I tried it but I am still getting a RenderFlex overflow error

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