Flutter Flavorizr

A flutter utility to easily create flavors in your flutter application

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Getting Started

Let's start by setting up our environment in order to run Flutter Flavorizr

Prerequisites

Side note: this tool works better on a new and clean Flutter project. Since some processors reference some existing files and a specific base structure, it could be possible that running Flutter Flavorizr over an existing project could throw errors.

Before running Flutter Flavorizr, you must install the following software:

• Ruby
• Gem
• Xcodeproj (through RubyGems)

These prerequisites are needed to manipulate the iOS and macOS projects and schemes. If you are interested in flavorizing Android only, you can skip this step.

If your app uses a Flutter plugin and you plan to create flavors for iOS and macOS, you need to make sure there's an existing Podfile file under the ios/macos folder. This might lead to problems like "Unable to load contents of file list".

Installation

This package is intended to support development of Flutter projects. In general, put it under dev_dependencies, in your pubspec.yaml:

dev_dependencies:
  flutter_flavorizr: ^2.2.3

You can install packages from the command line:

pub get

Create your flavors

Once all of the prerequisites have been installed and you have added flutter_flavorizr as a dev dependency, you have to edit your pubspec.yaml and define the flavors.

Example

Create a new file named flavorizr.yaml and define the name of the flavors, in our example apple and banana. For each flavor you have to specify the app name, the applicationId and the bundleId.

flavors:
  apple:
    app:
      name: "Apple App"

    android:
      applicationId: "com.example.apple"  
    ios:
      bundleId: "com.example.apple"
    macos:
      bundleId: "com.example.apple"  
  banana:
    app:
      name: "Banana App"
  
    android:
      applicationId: "com.example.banana"
    ios:
      bundleId: "com.example.banana"
    macos:
      bundleId: "com.example.banana"

Alternatively, add a new key named flavorizr and define a sub item named flavors. Under the flavors array you can define the name of the flavors, in our example apple and banana. For each flavor you have to specify the app name, the applicationId and the bundleId. This way of defining flavors will be deprecated in versions 3.x

flavorizr:
  flavors:
    apple:
      app:
        name: "Apple App"

      android:
        applicationId: "com.example.apple"
      ios:
        bundleId: "com.example.apple"
      macos:
        bundleId: "com.example.apple"        
    banana:
      app:
        name: "Banana App"

      android:
        applicationId: "com.example.banana"
      ios:
        bundleId: "com.example.banana"
      macos:
        bundleId: "com.example.banana"

Available fields

flavorizr

key	type	default	required	description
app	Object		false	An object describing the general capabilities of an app
flavors	Array		true	An array of items. Each of them describes a flavor configuration
instructions	Array		false	An array of instructions to customize the flavorizr process
assetsUrl	String	link	false	A string containing the URL of the zip assets file. The default points to the current release
ide	String		false	The IDE in which the app is being developed. Currently only vscode or idea

Available instructions

value	category	description
assets:download	Miscellaneous	Downloads the assets zip from the network
assets:extract	Miscellaneous	Extracts the downloaded zip in the project .tmp directory
assets:clean	Miscellaneous	Removes the assets from the project directory
android:buildGradle	Android	Adds the flavors to the Android build.gradle file
android:androidManifest	Android	Changes the reference of the app name in the AndroidManifest.xml
android:dummyAssets	Android	Generates some default icons for your custom flavors
android:icons	Android	Creates a set of icons for each flavor according to the icon directive
flutter:flavors	Flutter	Creates the flutter flavor configuration file
flutter:app	Flutter	Creates the app.dart entry
flutter:pages	Flutter	Creates a set of default pages for the app
flutter:main	Flutter	Creates the main target to run the app
flutter:targets	Flutter	Creates a set of targets for each flavor instance
google:firebase	Google	Adds Google Firebase configurations for Android and iOS for each flavor
huawei:agconnect	Huawei	Adds Huawei AGConnect configurations for Android for each flavor
ide:config	IDE	Generates debugging configurations for each flavor of your IDE
ios:podfile	iOS	Updates the Pods-Runner path for each flavor
ios:xcconfig	iOS	Creates a set of xcconfig files for each flavor and build configuration
ios:buildTargets	iOS	Creates a set of build targets for each flavor and build configuration
ios:schema	iOS	Creates a set of schemas for each flavor
ios:dummyAssets	iOS	Generates some default icons for your custom flavors
ios:icons	iOS	Creates a set of icons for each flavor according to the icon directive
ios:plist	iOS	Updates the info.plist file
ios:launchScreen	iOS	Creates a set of launchscreens for each flavor
macos:podfile	macOS	Updates the Pods-Runner path for each flavor
macos:xcconfig	macOS	Creates a set of xcconfig files for each flavor and build configuration
macos:configs	macOS	Creates a set of xcconfig files for each flavor and build configuration
macos:buildTargets	macOS	Creates a set of build targets for each flavor and build configuration
macos:schema	macOS	Creates a set of schemas for each flavor
macos:dummyAssets	macOS	Generates some default icons for your custom flavors
macos:icons	macOS	Creates a set of icons for each flavor according to the icon directive
macos:plist	macOS	Updates the info.plist file

android (under app)

key	type	default	required	description
flavorDimensions	String	"flavor-type"	false	The value of the flavorDimensions in the android build.gradle file
resValues	Array	{}	false	An array which contains a set of resValues configurations
buildConfigFields	Array	{}	false	An array which contains a set of buildConfigFields configurations

ios (under app)

key	type	default	required	description
buildSettings	Dictionary	{}	false	An XCode build configuration dictionary XCode Build Settings

macos (under app)

key	type	default	required	description
buildSettings	Dictionary	{}	false	An XCode build configuration dictionary XCode Build Settings

app (under flavorname)

key	type	default	required	description
name	String		true	The name of the App
icon	String		false	The icon path for this flavor

android (under flavorname)

key	type	default	required	description
applicationId	String		true	The applicationId of the Android App
firebase	Object		false	An object which contains a Firebase configuration
resValues	Array		false	An array which contains a set of resValues configurations
buildConfigFields	Array		false	An array which contains a set of buildConfigFields configurations
customConfig	Array		false	An array which contains a set of custom configs, overrides defaultConfig
generateDummyAssets	bool	true	false	True if you want to generate dummy assets (icon set, strings, etc)
icon	String		false	The icon path for this android flavor
adaptiveIcon	Array		false	An array which contains foreground and background of adaptive icon

ios (under flavorname)

key	type	default	required	description
bundleId	String		true	The bundleId of the iOS App
buildSettings	Dictionary	{}	false	A flavor-specific XCode build configuration dictionary XCode Build Settings
firebase	Object		false	An object which contains a Firebase configuration
variables	Array		false	An array which contains a set of variables configurations
generateDummyAssets	bool	true	false	True if you want to generate dummy assets (xcassets, etc)
icon	String		false	The icon path for this iOS flavor

macos (under flavorname)

key	type	default	required	description
bundleId	String		true	The bundleId of the macOS App
buildSettings	Dictionary	{}	false	A flavor-specific XCode build configuration dictionary XCode Build Settings
firebase	Object		false	An object which contains a Firebase configuration
variables	Array		false	An array which contains a set of variables configurations
generateDummyAssets	bool	true	false	True if you want to generate dummy assets (xcassets, etc)
icon	String		false	The icon path for this macOS flavor

firebase

key	type	default	required	description
config	String		false	The path to the Firebase configuration file (google-services.json for Android and GoogleService-Info.plist for iOS and macOS)

agconnect (for Android)

key	type	default	required	description
config	String		false	The path to the AGConnect configuration file (agconnect-services.json)

resValue (for Android)

key	type	default	required	description
type	String		true	The type of the resValue variable
value	String		true	The value of the resValue variable

flavors:
  apple:
    app:
      name: "Apple App"
  
    android:
      applicationId: "com.example.apple"
      resValues:
        variable_one:
          type: "string"
          value: "example variable one"
        variable_two:
          type: "string"
          value: "example variable two"
  
    ios:
      bundleId: "com.example.apple"

buildConfigField (for Android)

key	type	default	required	description
type	String		true	The type of the buildConfigField variable
value	String		true	The value of the buildConfigField variable

flavors:
  apple:
    app:
      name: "Apple App"
  
    android:
      applicationId: "com.example.apple"
      buildConfigFields:
        field_one:
          type: "String"
          value: "example field one"
        field_two:
          type: "char"
          value: "y"
        field_three:
          type: "double"
          value: "20.0"
  
    ios:
      bundleId: "com.example.apple"

variable (for iOS and macOS)

key	type	default	required	description
target	String		false	The type of the target (debug, release, profile). Do not specify a target if you want to apply it to all of them.
value	String		true	The value of the variable

flavors:
  apple:
    app:
      name: "Apple App"
  
    android:
      applicationId: "com.example.apple"
  
    ios:
      bundleId: "com.example.apple"
      variables:
        VARIABLE_ONE:
          value: "variable1"
        VARIABLE_TWO:
          target: "Debug"
          value: "variable2"        

customConfig (for Android only)

You can define any custom property for android

flavors:
  apple:
    app:
      name: "Apple App"
  
    android:
      applicationId: "com.example.apple"
      customConfig:
          versionNameSuffix: "\"-green-prod\"" # Don't forget to escape strings with \"
          signingConfig: flavorSigning.green
          versionCode: 1000
          minSdkVersion: 23
          # ..... and any custom property you want to add

This .yml part, generate this custom android flavor:

apple {
  dimension "flavor-type"
  applicationId "com.example.apple"
  versionNameSuffix "-green-prod"
  signingConfig flavorSigning.green
  versionCode 1000
  minSdkVersion 23
}

adaptiveIcon (for Android only)

You can define adaptiveIcon for android:

flavors:
  apple:
    app:
      name: "Apple App"
  
    android:
      applicationId: "com.example.apple"
      icon: "assets/icon/appleApp/ic_launcher.png"
      adaptiveIcon:
        foreground: "assets/adaptive_icon/appleApp/ic_launcher_foreground.png"
        background: "assets/adaptive_icon/appleApp/ic_launcher_background.png"

After removing adaptiveIcon key, the adaptive icons generated before will still exist. Please delete adaptiveIcon manually.

Usage

When you finished defining the flavorizr configuration, you can proceed by running the script with:

flutter pub run flutter_flavorizr

You can also run flutter_flavorizr with a custom set of processors by appending the -p (or --processors) param followed by the processor names separated by comma:

flutter pub run flutter_flavorizr -p <processor_1>,<processor_2>

Example

flutter pub run flutter_flavorizr -p assets:download
flutter pub run flutter_flavorizr -p assets:download,assets:extract

Run your flavors

Once the process has generated the flavors, you can run them by typing

flutter run --flavor <flavorName> -t lib/main_<flavorName>.dart

Example

flutter run --flavor apple -t lib/main_apple.dart
flutter run --flavor banana -t lib/main_banana.dart

Currently, due to a bug in the Flutter SDK, it's not possible to run the macOS flavors from the terminal. You can run them from XCode by selecting the proper schema and by pressing play.

Default processors set

By default, when you do not specify a custom set of processors by appending the -p (or --processors) param, a default processors set will be used:

• assets:download
• assets:extract
• android:androidManifest
• android:buildGradle
• android:dummyAssets
• android:icons
• flutter:flavors
• flutter:app
• flutter:pages
• flutter:main
• flutter:targets
• ios:podfile
• ios:xcconfig
• ios:buildTargets
• ios:schema
• ios:dummyAssets
• ios:icons
• ios:plist
• ios:launchScreen
• macos:podfile
• macos:xcconfig
• macos:configs
• macos:buildTargets
• macos:schema
• macos:dummyAssets
• macos:icons
• macos:plist
• google:firebase
• huawei:agconnect
• assets:clean
• ide:config

Customize your app

Flutter_flavorizr creates different dart files in the lib folder. In the flavors.dart file we have the F class which contains all of our customizations.

class F {
  static Flavor? appFlavor;

  static String get title {
    switch (appFlavor) {
      case Flavor.apple:
        return 'Apple App';
      case Flavor.banana:
        return 'Banana App';
      default:
        return 'title';
    }
  }

}

The process creates a simple title customization: a switch which checks the current appFlavor (defined in our app starting point) and returns the correct value. Here you can write whatever you want, you can create your custom app color palette, differentiate the URL action of a button, and so on.

If you are wondering how to use these getters, you can find an example under the pages folder: in the my_home_page.dart file, the page shown after the launch of the app, we can see a clear reference on the title getter defined in the F class.

Side notes

I haven't found yet a good groovy parser to guarantee the idempotency of the AndroidBuildGradleProcessor.
The only way to keep track of the autogenerated flavorDimensions is to mark up the beginning and the end of the section with magic comments.
Please do not erase these comments otherwise you will break down the AndroidBuildGradleProcessor.

Third party services

Google Firebase

In order to flavorize your project and enable Firebase in your flavor you have to define a firebase object below each OS flavor. Under the firebase object you must define the config path of the google-services.json (if you are under Android configuration) or GoogleService-Info.plist (if you are under iOS or macOS configuration).

As you can see in the example below, we added the path accordingly

flavors:
  apple:
    app:
      name: "Apple App"
  
    android:
      applicationId: "com.example.apple"
      firebase:
        config: ".firebase/apple/google-services.json"
  
    ios:
      bundleId: "com.example.apple"
      firebase:
        config: ".firebase/apple/GoogleService-Info.plist"
  
  banana:
    app:
      name: "Banana App"
      
    android:
      applicationId: "com.example.banana"
      firebase:
        config: ".firebase/banana/google-services.json"
    ios:
      bundleId: "com.example.banana"
      firebase:
        config: ".firebase/banana/GoogleService-Info.plist"

Huawei AppGallery Connect

In order to flavorize your project and enable AppGallery Connect in your flavor
you have to define an agconnect object below each Android flavor. Under the agconnect object you must define the config path of the agconnect-services.json.

As you can see in the example below, we added the path accordingly

flavors:
  apple:
    app:
      name: "Apple App"
  
    android:
      applicationId: "com.example.apple"
      agconnect:
        config: ".agconnect/apple/agconnect-services.json"
  
    ios:
      bundleId: "com.example.apple"
  
  banana:
    app:
      name: "Banana App"
      
    android:
      applicationId: "com.example.banana"
      agconnect:
        config: ".agconnect/banana/agconnect-services.json"
    ios:
      bundleId: "com.example.banana"

Troubleshooting

How to fix the error "Unable to load contents of file list"

Docs & Tutorials (from the community)

Easily build flavors in Flutter (Android and iOS) with flutter_flavorizr - Angelo Cassano

Get the best out of Flutter flavors with flutter_flavorizr - Pierre Monier

Further developments

• Let the user define its custom set of available instructions.

Questions and bugs

Please feel free to submit new issues if you encounter problems while using this library.

If you need help with the use of the library or you just want to request new features, please use the Discussions section of the repository. Issues opened as questions will be automatically closed.

License

Flutter Flavorizr is available under the MIT license. See the LICENSE file for more info.