Define buildconfigfield for an specific flavor AND buildType

Loop the variants and check their names:

productFlavors {    vanilla {}    chocolate {}}applicationVariants.all { variant ->    println("Iterating variant: " + variant.getName())    if (variant.getName() == "chocolateDebug") {        variant.buildConfigField "boolean", "VARIABLE", "true"    } else {        variant.buildConfigField "boolean", "VARIABLE", "false"    }}

Here is a solution without lacks I've described under Simas answer

buildTypes {    debug {}    release {}}productFlavors {    vanilla {        ext {            variable = [debug: "vanilla-debug value", release: "vanilla-release value"]        }    }    chocolate {        ext {            variable = [debug: "chocolate-debug value", release: "chocolate-release value"]        }    }}applicationVariants.all { variant ->    def flavor = variant.productFlavors[0]    variant.buildConfigField "boolean", "VARIABLE", "\"${flavor.variable[variant.buildType.name]}\""}

Within the Gradle build system, buildTypes and productFlavors are unfortunately two separate entities.

As far as I am aware, to complete what you want to achieve, you would need to create another build flavour as such:

buildTypes {        debug{}        release {}    }    productFlavors {        vanillaDebug {             buildConfigField BOOLEAN, VARIABLE, FALSE        }        vanillaRelease {             buildConfigField BOOLEAN, VARIABLE, TRUE        }        chocolate {             buildConfigField BOOLEAN, VARIABLE, FALSE        }    }