flutter dropdown button remove underline

103

Just wrap DropdownButton inside DropdownButtonHideUnderline like this :

new DropdownButtonHideUnderline(
 child: DropdownButton()
)

DropdownButtonFormField&lt;int&gt;(
  decoration: InputDecoration(
    enabledBorder: InputBorder.none,
    ...
  ),
  ...
)

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