How to build Google protocol buffers and Kotlin using Gradle?

Question

I\'m trying to build a project that uses both Google protocol buffers and Kotlin using Gradle. I want the proto files to compile into Java source, which is then called from my K

Answer 1

For Kotlin and Android:

android {

    sourceSets {
        debug.java.srcDirs += 'build/generated/source/proto/debug/java'
        release.java.srcDirs += 'build/generated/source/proto/release/java'
    }
}

An additional source directory has to be added for every build type. In this sample there are two build types: debug and release.

If you're using grpc, another line has to be added per build type:

android {

    sourceSets {
        debug.java.srcDirs += 'build/generated/source/proto/debug/java'
        debug.java.srcDirs += 'build/generated/source/proto/debug/grpc'
        release.java.srcDirs += 'build/generated/source/proto/release/java'
        release.java.srcDirs += 'build/generated/source/proto/release/grpc'
    }
}

At least with Kotlin 1.0.6, protobuf-gradle-plugin 0.8.0, protobuf 3.2.x and grpc 1.x it's not required to fiddle with the task order.