How to keep all constants in Flutter

A clean and simple way to keep constants in Flutter is to make an own Dart library in the project for the constants.

For example, we have a project structure like this.

constats.dart

const String BUTTON_LABEL = 'Submit';

The const keyword is used to represent a compile-time constant. Variables declared with const keyword are implicitly final. Link

You can then use import statement to access to the constants:

import 'package:<project_name>/assets/constants.dart' as constants;
...
ElevatedButton(
  child: const Text(constants.BUTTON_LABEL),
)
...

Comments

[Dmytro Turskyi]

Hi, great article, but your constant violates [constant_identifier_names]. Dart constants should be lowerCamelCase, not UPPERCASE_WITH_UNDERSCORES. This avoids name changes when constants become final non-const variables. Also, enum values are const and lowercase. So, your example should be:

// constants.dart
const String buttonLabel = 'Submit';

… No offence, just a friendly correction. 😊

[khalil panahi]

Nice to know 👏👏