Flutter / Dart Convert Int to Enum

Question

Is there a simple way to convert an integer value to enum? I want to retrieve an integer value from shared preference and convert it to an enum type.

My enum is:

enum ThemeColor { red, gree, blue, orange, pink, white, black };

I want to easily convert an integer to an enum:

final prefs = await SharedPreferences.getInstance();
ThemeColor c = ThemeColor.convert(prefs.getInt('theme_color')); // something like that

How did you add enum in the SharedPrefs. Could you please guide me a bit. — Pawan, Nov 13 '18 at 10:10
@Pawan being `status` an `enum`, you can `status.index` to get the int value — maganap, Jan 19 '20 at 22:54

score 109 · Accepted Answer · answered Jul 05 '18 at 11:22

109

int idx = 2;
print(ThemeColor.values[idx]);

should give you

ThemeColor.blue

answered Jul 05 '18 at 11:22

Günter Zöchbauer

558,509
191
1,911
1,506

score 24 · Answer 2 · edited Oct 23 '20 at 06:44

24

You can use:

ThemeColor.red.index

should give you

edited Oct 23 '20 at 06:44

Zig Razor

3,022
2
10
29

answered Oct 23 '20 at 04:16

Farman Ameer

935
1
12
19

score 0 · Answer 3 · answered Jun 04 '21 at 14:16

setup your enum then use the value to get enum by index value

 enum Status { A, B, C, D }

 TextStyle _getColorStyle(Status customStatus) {
      Color retCol;
      switch (customStatus) {
          case Status.A:
             retCol = Colors.green;
             break;
          case Status.B:
             retCol = Colors.white;
             break;
          case Status.C:
             retCol = Colors.yellow;
             break;
          case Status.D:
             retCol = Colors.red;
             break;
        }
       return TextStyle(fontSize: 18, color: retCol);
     }

Call the function

     _getColorStyle(Status.values[myView.customStatus])

score 0 · Answer 4 · answered Apr 19 '22 at 12:03

In Dart 2.17, you can use enhanced enums with values (which could have a different value to your index). Make sure you use the correct one for your needs. You can also define your own getter on your enum.

//returns Foo.one
print(Foo.values.firstWhere((x) => x.value == 1));
  
//returns Foo.two
print(Foo.values[1]);
  
//returns Foo.one
print(Foo.getByValue(1));

enum Foo {
  one(1),
  two(2);

  const Foo(this.value);
  final num value;
  
  static Foo getByValue(num i){
    return Foo.values.firstWhere((x) => x.value == i);
  }
}

Flutter / Dart Convert Int to Enum

4 Answers4

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