DropdownButton

DropdownButton(
  isExpanded: true,
  underline: SizedBox(),
  icon: SvgPicture.asset('assets/icons/dropdown.svg'),
  value: 'Indonesia',
  items: ['Indonesia', 'Bangladesh', 'United States']
      .map<DropdownMenuItem<String>>((String value) {
    return DropdownMenuItem<String>(
        value: value, child: Text(value));
  }).toList(),
  onChanged: (value) {},
),