Adding a flavor for Android

• in app's build.gradle

  android {
    // ... 
  
    flavorDimensions "default"
    productFlavors {
        development {
            dimension "default"
            buildConfigField("String", "FLAVOR_CONFIGURATION", '"development"')
        }
        production {
            dimension "default"
            buildConfigField("String", "FLAVOR_CONFIGURATION", '"production"')
        }
    }
    // ... 
  }
  

• Now able to add specific flavor files to app/src/development/$build_type or app/src/production/$build_type (e.g. google-services.json)

Adding a flavor to iOS

• iOS flavors are not quite as intuitive or straight forward
• Under the project info section, duplicate the Debug configuration and the Release configuration and name them Debug-Development, Debug-Production, Release-Development, and Release-Production
• Under the target build settings, click the + and add User-Defined Setting named FLAVOR_CONFIGURATION and for each buuld configuration, give it a value (debug or production)
• In XCode, Product > Scheme > New Scheme, and create two new schemes, Development and Production
• In XCode, Product > Scheme > Manage Schemes, and delete the default Runner Scheme
• In XCode, Product > Scheme > Edit Schemes, and for each build option set the proper build configuration for Development and Production schemes. i.e. development should be using and $config-development, and production $config-production.
• In the info.plist for target Runner add the following key/value {"FlavorConfiguration" : "${FLAVOR_CONFIGURATION}"}

Specifying a flavor from the command line

• flutter run --flavor $flavor_name

Accessing flavor information from Android

Kotlin or Java

• Able to access configuration values natively with BuildConfig.FLAVOR_CONFIGURATION

Accessing flavor information from iOS

• Objective-C NSString *flavorConfig = (NSString *) [[NSBundle mainBundle] objectForInfoDictionaryKey:@"FlavorConfiguration"];
• Swift let flavorConfig = Bundle.main.object(forInfoDictionaryKey: "FlavorConfiguration")!