😍Config Build Flavor on Flutter

After adding environments for Ios and Android platform we need to config on Flutter project with some information like API_URL for staging, nightly, and production.

1. Create EnvironmentDefault class like this:

abstract class EnvironmentDefault {
  abstract var API_URL;
  static EnvironmentDefault getInstance() {
    if (_instance == null) {
      throw ("EnvironmentDefault _instance is null ");
    }
    return _instance!;
  }

  EnvironmentDefault() {
    _instance = this;
  }
}

1. Create Environment Nightly, Staging, Production extends EnvironmentDefault

Nightly:

class EnvironmentNightly extends EnvironmentDefault {
  EnvironmentNightly() : super();
  @override
  var API_URL = "https://nightly.company.com";
}

Staging:

class EnvironmentStaging extends EnvironmentDefault {
  EnvironmentStaging() : super();
  @override
  var API_URL = "https://stg.company.com";
}

Production:

class EnvironmentProduction extends EnvironmentDefault {
  EnvironmentProduction() : super();
  @override
  var API_URL = "https://production.company.com";
}

1. Create 3 main classes called:

• main_stg.dart with environment staging

main_stg.dart

void main() async {
    EnvironmentStaging();
    runApp(App());
  }

• main_nightly.dart with environment nightly

main_nightly.dart

void main() async {
  EnvironmentNightly();
  runApp(App());
}

• main_production.dart with environment production

main_production.dart

void main() async {
  EnvironmentProduction();
  runApp(App());
}

In your code, if you need to get API_URL for the right environment just use:

EnvironmentDefault.getInstance().API_URL

Build the project with your flavor, and open "Edit configurations" in Android Studio:

Done!!