Full width DropdownButton with adjust dropdown arrow icon in Flutter

Question

I needed to add DropdownButton with full width with adjust dropdown arrow icon in Flutter as well. But with many tried it in many ways but it doesn't expand its width full.

This is my code for DropdownButton:

new Expanded(
    child: new Column(
    children: <Widget>[
        new DropdownButton(
            items: [
                new DropdownMenuItem(child: new Text("Abc")),
                new DropdownMenuItem(child: new Text("Xyz")),
            ],
            hint: new Text("Select City"),
            onChanged: null
          )
       ]
    ),
    flex: 1,
)

AnasSafi · Accepted Answer · 2022-12-24 16:30:43Z

284

Just adding isExpanded:true to the DropdownButton

  Widget example() {
    return DropdownButton(
          isExpanded: true,
            items: const [
               DropdownMenuItem(child: Text("Abc")),
               DropdownMenuItem(child: Text("Xyz")),
            ],
            hint: const Text("Select City"),
            onChanged: null
        );
  }

edited Dec 24, 2022 at 16:30

AnasSafi

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answered Feb 26, 2019 at 9:24

Pablo C. García

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2 Comments

Kamlesh Over a year ago

Do not forget to add fix width container or expanded widget outside of DropDownButton widget otherwise "isExpanded: true" attribute will not work and show error in console. Thanks for asking query.

mauriii Over a year ago

It makes sense, but I didn't test this variable because I assumed it meant the dropdown itself would be expanded/opened

aqwert · Accepted Answer · 2018-08-15 03:41:01Z

3

Try to add the following in the Column you have...

Column(
  crossAxisAlignment: CrossAxisAlignment.stretch,
  ...
)

You should not need the Expanded widget as that would try to fill the vertical space and not the horizontal (width) space.

answered Aug 15, 2018 at 3:41

aqwert

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2 Comments

Sandip Patel Over a year ago

Thanks @aqwert using your code i got full width of DropdownButton but DropDownButton Arrow not Adjusted there. As full width of DropdownButton arrow should be positioned at end.

Boy Over a year ago

Adding isExpanded: true to the DropDownButton fixed this @SandipPatel

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