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並前往https://coderedirect.com/questions/225807/flutter-there-should-be-exactly-one-item-with-dropdownbuttons-value

There should be exactly one item with [DropdownButton]'s value

I am trying to create a dropdown button in Flutter. ... return ListView( children: <Widget>[ SizedBox( height: MediaQuery.of(context).size.height * 0.2, ) ...

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