Gradle: add dependency for a specific flavour of the library

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

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!