android - Gradle: add dependency for a specific flavour of the library

Question

I have a library project and a application. I'd like to have 2 product flavours (store, dev) for both library and application. When I build the store flavour for the application I want to use the store flavour from the library. Also when I build the dev flavour for the application I want to use the dev flavour from the library. I tried setting the same product flavours for both library and application but it does not work.

Here is my configuration:

Library

apply plugin: 'android-library'

android {
    compileSdkVersion 19
    buildToolsVersion "19.1.0"

    defaultConfig {
        applicationId "ro.amarkovits.graddletest.lib"
        minSdkVersion 14
        targetSdkVersion 19
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors{
        store{

        }
        dev{

        }
    }

}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
}

and I have this files: src/main/res/values/strings.xml and src/store/res/values/strings.xml

Application

apply plugin: 'android'

android {
    compileSdkVersion 19
    buildToolsVersion '19.1.0'
    defaultConfig {
        applicationId 'ro.amarkovits.mymodule.app'
        minSdkVersion 14
        targetSdkVersion 19
        versionCode 1
        versionName '1.0'
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors{
        store{

        }
        dev{

        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile project(':lib')
}

In this situation I get this error: Error:(12, 23) No resource found that matches the given name (at 'text' with value '@string/app_name'). The app_name is defined in string.xml in the library (in both main and store directory)

If I remove the productFlavors from the library it builds but always use the values.xml from the main directory

Answer 1

In your library you need to tell gradle to build every time every variant:

android {
    publishNonDefault true
}

Then in your application, since recently I guess, you can do this:

dependencies {
    (...)
    devCompile project(path: ':lib', configuration: 'devDebug') // or 'devRelease'
    storeCompile project(path: ':lib', configuration: 'storeRelease') // or 'storeDebug'
}

Found in the official documentation under Library Publication.

Edit:

Since version 0.14.3 (2014/11/18), you can now have Flavor-buildType-Compile directive as well:

In your build.gradle before the android {} scope add the following:

configurations {
    devDebugCompile
    devReleaseCompile
    storeDebugCompile
    storeReleaseCompile
}

Then you can declare and use different versions of your library per Flavor-BuildType:

dependencies {
    (...)
    devDebugCompile project(path: ':lib', configuration: 'devDebug')
    devReleaseCompile project(path: ':lib', configuration: 'devRelease')
    storeDebugCompile project(path: ':lib', configuration: 'storeDebug')
    storeReleaseCompile project(path: ':lib', configuration: 'storeRelease') 
}

Edit:

Dependency management between modules has changed since Android Gradle Plugin 3.0.0. It automatically tries to matches flavours between your app and the libraries/modules it depends on.

See the documentation for the whole explanation!