Flutter: how to fix bottom overflow

Question

I have a Flutter Widget with a column layout that has two Containers, one of which has a ListView.builder. When the page renders I get a

bottom overflow by 169px

and I'm not sure how to fix it.

I've googled around for solutions and have tried various things like wrapping one or more of the Containers in the widget in an Expanded widget, but that doesn't work either. If I wrap just the Container that has the FutureBuilder inside of it in an Expanded, then the ListView doesn't render at all and I see errors like:

I/flutter ( 3516): Another exception was thrown: RenderFlex children have non-zero flex but incoming height constraints are unbounded.
I/flutter ( 3516): Another exception was thrown: RenderBox was not laid out: RenderFlex#0caf9 relayoutBoundary=up2 NEEDS-PAINT
I/flutter ( 3516): Another exception was thrown: RenderBox was not laid out: RenderFlex#963f4 relayoutBoundary=up1 NEEDS-PAINT
I/flutter ( 3516): Another exception was thrown: NoSuchMethodError: The method '<=' was called on null.

This is what the build function of my Widget looks like:

  Widget build(BuildContext context) {
    return Container(
        child: Column(children: <Widget>[
      Container(
          height: 40,
          color: Colors.grey.withOpacity(0.5),
          child: Padding(
              padding: const EdgeInsets.fromLTRB(10.0, 2.0, 10.0, 2.0),
              child: TextField(
                  autofocus: false,
                  controller: searchFilterController,
                  keyboardType: TextInputType.text,
                  maxLines: 1,
                  decoration: InputDecoration(
                      border: InputBorder.none,
                      filled: true,
                      fillColor: Colors.white.withOpacity(1),
                      hintText: 'Search',
                      suffixIcon: Icon(
                        Icons.search,
                        color: Colors.grey,
                      )),
                  onChanged: (value) {
                    filter = value;
                  }))),

      Container(
          child: FutureBuilder<UserPantry>(
        future: UserPantryDao.getUserPantry(widget.userId),
        builder: (context, snapshot) {
          if (snapshot.hasData) {
            widget.ingredientList.clear();
            if (filter == null || filter.trim() == "") {
              widget.ingredientList.addAll(snapshot.data.ingredients);
            } else {
              for (UserIngredient ingredient in snapshot.data.ingredients) {
                if (ingredient.ingredient.name
                    .toLowerCase()
                    .contains(filter.toLowerCase())) {
                  widget.ingredientList.add(ingredient);
                }
              }
            }

            return ListView.builder(
                shrinkWrap: true,
                itemCount: widget.ingredientList.length,
                itemBuilder: (BuildContext context, int index) {
                  return ListTile(
                      title: Text(
                    widget.ingredientList[index].ingredient.name,
                    style: TextStyle(fontSize: 20.0),
                  ));
                });
          } else if (snapshot.hasError) {
            print(snapshot.error);
            return Text(
                "An error occurred while loading your pantry. Please try again.");
          }
          //By default just show an empty container.
          return Container();
        },
      ))
    ]));
  }

Vincent · Accepted Answer · 2019-06-03 02:29:40Z

Try remove the Container outside, and wrap the list in a expanded. As @Miguel Ruivo answered, ListView must have a bounded constraints.

Widget build(BuildContext context) {
    return Column(children: <Widget>[
      Container(
          height: 40,
          color: Colors.grey.withOpacity(0.5),
          child: Padding(
              padding: const EdgeInsets.fromLTRB(10.0, 2.0, 10.0, 2.0),
              child: TextField(
                  autofocus: false,
                  controller: searchFilterController,
                  keyboardType: TextInputType.text,
                  maxLines: 1,
                  decoration: InputDecoration(
                      border: InputBorder.none,
                      filled: true,
                      fillColor: Colors.white.withOpacity(1),
                      hintText: 'Search',
                      suffixIcon: Icon(
                        Icons.search,
                        color: Colors.grey,
                      )),
                  onChanged: (value) {
                    filter = value;
                  }))),
      Expanded(
          child: FutureBuilder<UserPantry>(
        future: UserPantryDao.getUserPantry(widget.userId),
        builder: (context, snapshot) {
          if (snapshot.hasData) {
            widget.ingredientList.clear();
            if (filter == null || filter.trim() == "") {
              widget.ingredientList.addAll(snapshot.data.ingredients);
            } else {
              for (UserIngredient ingredient in snapshot.data.ingredients) {
                if (ingredient.ingredient.name
                    .toLowerCase()
                    .contains(filter.toLowerCase())) {
                  widget.ingredientList.add(ingredient);
                }
              }
            }

            return ListView.builder(
                shrinkWrap: true,
                itemCount: widget.ingredientList.length,
                itemBuilder: (BuildContext context, int index) {
                  return ListTile(
                      title: Text(
                    widget.ingredientList[index].ingredient.name,
                    style: TextStyle(fontSize: 20.0),
                  ));
                });
          } else if (snapshot.hasError) {
            print(snapshot.error);
            return Text(
                "An error occurred while loading your pantry. Please try again.");
          }
          //By default just show an empty container.
          return Container();
        },
      ))
    ]);
  }

Osama Sandhu · Accepted Answer · 2020-11-13 09:52:20Z

3

Simply Wrap the List only with Expanded. Try this:

Column(
            children: [
              Container(
                child: Text("data"),
                color: Colors.redAccent,
              ),
              Expanded(child: ListView.builder(itemBuilder: (context, i) {
                return Text("data");
              })),
            ],
          ),

answered Nov 13, 2020 at 9:52

Osama Sandhu

4217 silver badges12 bronze badges

Comments

Miguel Ruivo · Accepted Answer · 2019-06-02 23:51:24Z

0

Just wrap your FutureBuilder<UserPantry> in an Expanded widget and remove the Container because you don't need it at all here.

 Expanded(
        child: FutureBuilder<UserPantry>(
           future: UserPantryDao.getUserPantry(widget.userId),
   ...

This happens because you're giving unbounded constraints to the ListView. Another option, would be adding some height constraint to the ListView parent, such as setting the height in the Container to something.

answered Jun 2, 2019 at 23:51

Miguel Ruivo

18k7 gold badges67 silver badges92 bronze badges

4 Comments

cloudwalker Over a year ago

That was one of the things I tried already, but when I do that the whole page is blank and I see these errors in the console: I/flutter ( 5471): Another exception was thrown: RenderBox was not laid out: RenderFlex#350b4 relayoutBoundary=up2 NEEDS-PAINT I/flutter ( 5471): Another exception was thrown: RenderBox was not laid out: RenderFlex#3fe57 relayoutBoundary=up1 NEEDS-PAINT I/flutter ( 5471): Another exception was thrown: NoSuchMethodError: The method '<=' was called on null.

Miguel Ruivo Over a year ago

I don’t have your whole tree. As you’ve it right now, it should work. Anyway, just set some height to the Container and you should be fine.

cloudwalker Over a year ago

Setting a height on the container does resolve the issue, but how will I know what height to use? Won't it vary from device to device?

Miguel Ruivo Over a year ago

Yes, but you can use a %, by doing MediaQuery.of(context).size.height * 0.5, this will set your ListView to use 50% of the screen height. However, with Expanded you shouldn't need this, and it should work as well, because you'll expand to fill the viewport vertically.

Ping Woo · Accepted Answer · 2020-09-24 04:50:30Z

0

Wrapping ListView.separated( separatorBuilder: (context, index) => Divider(), ...) in Expanded will solve your issue.

Eg: Expanded(child: ListView.separated(separatorBuilder: (context, index) =>Divider(),itemCount: 1, itemBuilder: (context, index) {return Container(height:200.0, child: ...);})

answered Sep 24, 2020 at 4:50

Ping Woo

1,80317 silver badges23 bronze badges

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