Setting environment variables in Flutter

Starting from Flutter 1.17 you can define compile-time variables if you want to.

To do so just use --dart-define argument during flutter run or flutter build

If you need to pass multiple key-value pairs, just define --dart-define multiple times:

flutter run --dart-define=SOME_VAR=SOME_VALUE --dart-define=OTHER_VAR=OTHER_VALUE

and then, anywhere in your code you can use them like:

const SOME_VAR = String.fromEnvironment('SOME_VAR', defaultValue: 'SOME_DEFAULT_VALUE');
const OTHER_VAR = String.fromEnvironment('OTHER_VAR', defaultValue: 'OTHER_DEFAULT_VALUE');

Also, they can be used in native layers too.

Here is an article that explains more.