Simple example of flavorDimensions using the Android Gradle plugin

build.gradle

android {
    ...
   
    defaultConfig {
        ...
        buildConfigField "String", "API_URL", "http://default-url.com"
        buildConfigField "String", "THIRD_PARTY_API_KEY", "rAnDomKeYF0rS3rV1ce"
    }
    
    flavorDimensions "skin", "env"
    
    productFlavors {
        skin1 {
            dimension = "skin"
            buildConfigField "String", "THIRD_PARTY_API_KEY", "rAnDomKeYF0rS3rV1ceSk1n1"
        }
        skin2 {
            dimension = "skin"
            buildConfigField "String", "THIRD_PARTY_API_KEY", "rAnDomKeYF0rS3rV1ceSk1n2"
        }
        development{
            dimension = "env"
        }
        staging {
            dimension = "env"
            buildConfigField "String", "API_URL", "https://staging-url.com"
        }
        production {
            dimension = "env"
            buildConfigField "String", "API_URL", "https://production-url.com"
        }
    }
    
    ...

}