how to put some variables into List-CodePudding

i have 3 variable for dropdownValue to put in a List, how to do it is it possible ? because i want to make 3 dropdown by looping the list and give every dropdown the value from the list

  String dropdownValue1;
  String dropdownValue2;
  String dropdownValue3;

  List dropdownValue = []

CodePudding user response：

Values that we put in the array are should not be null. In your code dropdownValue1, dropdownValue2, dropdownValue3 values are null that's when you add them to the array you get an error.

try adding values to variables and them in the array.

Example code:

String dropdownValue1 = "dropdownValue1";
String dropdownValue2 = "dropdownValue2";
String dropdownValue3 = "dropdownValue3";

List<String> dropdownValue = [
  dropdownValue1,
  dropdownValue2,
  dropdownValue3
];

CodePudding user response：

Try this way:

List<String> dropdownValues = ["dropdownValue1","dropdownValue2","dropdownValue3"];

And to use the values:

dropdownValues[index] //replace the index with the value you want to pick