Android studio doesn't recognise source folders

Question

I\'m using a standard Android Studio directory structure and I created different build types:

buildTypes {
    debug {
        runProguard false
        packageN         


        

Answer 1

Add this to your module's build.gradle file:

sourceSets {
    main.java.srcDirs += 'src/preview/java'
    main.java.srcDirs += 'src/release/java'
}