Dropdown selection not displaying with Flutter

Question

I\' m gettings items from JSON and displaying them in a dropdown. When the person select an item from the dropdown list, I get the selection but the selected item doesn\'t c

Answer 1

make sure you are not declaring the selectedValue inside the Widget the below example works for me perfectly.

here is the working code on dartpad to test it out

var currentSelectedValue;
const deviceTypes = ["Mac", "Windows", "Mobile"];

 Widget typeFieldWidget() {
return Container(
  padding: EdgeInsets.symmetric(horizontal: 20),
  child: FormField(
    builder: (FormFieldState state) {
      return InputDecorator(
        decoration: InputDecoration(
            border: OutlineInputBorder(
                borderRadius: BorderRadius.circular(5.0))),
        child: DropdownButtonHideUnderline(
          child: DropdownButton(
            hint: Text("Select Device"),
            value: currentSelectedValue,
            isDense: true,
            onChanged: (newValue) {
              setState(() {
                currentSelectedValue = newValue;
              });
              print(currentSelectedValue);
            },
            items: deviceTypes.map((String value) {
              return DropdownMenuItem(
                value: value,
                child: Text(value),
              );
            }).toList(),
          ),
        ),
      );
    },
  ),
);
}