How to make rounded border for dropdownbutton in flutter?

Question

How to Add Rounded Rectangle Border? Below Code didn't result in any border on screen.

Container(margin: EdgeInsets.only(top: 10.0, right: 10.0, left: 10.0),
 width: double.infinity,
 // decoration: ShapeDecoration(
 //  shape: RoundedRectangleBorder(
 //   borderRadius:BorderRadius.all(Radius.circular(5.0)),
 //                             ),

 child: DropdownButtonHideUnderline(
  child: Container(
   margin: EdgeInsets.only(
    left: 10.0, right: 10.0),
     child: new DropdownButton<UserTest>(...),
                           ),
                          ),
                   ),

Solution 1

You need to specify the side: property. By default it is BorderSide.none.

      decoration: ShapeDecoration(
        shape: RoundedRectangleBorder(
          side: BorderSide(width: 1.0, style: BorderStyle.solid),
          borderRadius: BorderRadius.all(Radius.circular(5.0)),
        ),
      ),

Solution 2

With the form field variant, you can use the OutlineInputBorder InputBorder, used normally for input text fields:

DropdownButtonFormField(
  ...
  decoration: const InputDecoration(
    border: OutlineInputBorder(),
  ),
),

The way the form field does this can be replicated and used with the regular DropdownButton:

InputDecorator(
  decoration: const InputDecoration(border: OutlineInputBorder()),
  child: DropdownButtonHideUnderline(
    child: DropdownButton(
      ...
    ),
  ),
),

Solution 3

If what you want is this...

Then here you go

    import 'package:flutter/material.dart';

class RoundedBorderDropdown extends StatelessWidget {
  final List<String> _dropdownValues = [
    "One",
    "Two",
    "Three",
    "Four",
    "Five"
  ]; //The list of values we want on the dropdown

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Rounded Border Button in AppBar'),
      ),
      body: Center(
        child: Container(
          padding: EdgeInsets.symmetric(horizontal: 10.0),
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(15.0),
            border: Border.all(
                color: Colors.red, style: BorderStyle.solid, width: 0.80),
          ),
          child: DropdownButton(
            items: _dropdownValues
                .map((value) => DropdownMenuItem(
                      child: Text(value),
                      value: value,
                    ))
                .toList(),
            onChanged: (String value) {},
            isExpanded: false,
            value: _dropdownValues.first,
          ),
        ),
      ),
    );
  }
}

That is courtesy inducesmile

Happy Coding...

Solution 4

Column(
    crossAxisAlignment : CrossAxisAlignment.start,
    children: <Widget> [
        Text('Gender:'),
        InputDecorator(
            decoration: InputDecoration(
                border: OutlineInputBorder(borderRadius: const BorderRadius.all(Radius.circular(4.0)),
                contentPadding: EdgeInsets.all(10),
            ),
            child: DropdownButtonHideUnderline(
                child: DropdownButton<String>(
                    value: gender,
                    isDense: true,
                    isExpanded: true,
                    items: [
                        DropdownMenuItem(child: Text("Select Gender"), value: ""),
                        DropdownMenuItem(child: Text("Male"), value: "Male"),
                        DropdownMenuItem(child: Text("Female"), value: "Female"),
                    ],
                    onChanged: (newValue) {
                        setState(() {
                        });
                    },
                ),
            ),
        ),
    ]
),

Solution 5

Container(width: 200.0,
          height: 50.0,
          decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(7.0),
          border: Border.all(color: Colors.blueGrey)),
                         child: DropdownButton<String>(
                         hint: Text("Messaging"),
                         items: <String>['Messaging', 'Chating', 'No Longer Interested', 'Document Request'].map((String value) {
                            return new DropdownMenuItem<String>(
                              value: value,
                              child: new Text(value),
                            );
                          }).toList(),
                          onChanged: (_) {},
                      ),
                      )

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