Error: Either zero or 2 or more [DropdownMenuItem]s were detected with the same value I/flutter (18363): 'package:flutter/src/material/dropdown.dart':

Question

Error code Hi I\'m new to flutter and have a question about dropdownbutton regarding using the same values for multiple dropdownbutton.

From my understanding from th

Answer 1

You are getting that exception because _value1 and _value2 aren't initialized and providing empty to the dropdown widget.

You could do something like this:

DropdownButton(
  value: _value1.isNotEmpty ? _value1 : null, // guard it with null if empty
  items: nameList.map((item) {
           return DropdownMenuItem(
              value: item,
              child: new Text(item),
           );
         }).toList(), 
);