How to generate javadoc for android library when it has dependencies which are also aar libraries?

Question

I have android library project which depends on other android library projects. I need to generate javadoc for library but it fails because gradle puts to javadoc classpath

Answer 1

This is how I solved this issue, using zipTree. Configuration: Gradle 4.10, Gradle Plugin: 3.3.2, Android Studio: 3.4.

task javadoc(type: Javadoc) {

    doFirst {
        configurations.implementation
                .filter { it.name.endsWith('.aar') }
        .each { aar ->
            copy {
                from zipTree(aar)
                include "**/classes.jar"
                into "$buildDir/tmp/aarsToJars/${aar.name.replace('.aar', '')}/"
            }
        }
    }

    configurations.implementation.setCanBeResolved(true)
    source = android.sourceSets.main.java.srcDirs
    classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
    classpath += configurations.implementation
    classpath += fileTree(dir: "$buildDir/tmp/aarsToJars/")
    destinationDir = file("${project.buildDir}/outputs/javadoc/")
    failOnError false
    exclude '**/BuildConfig.java'
    exclude '**/R.java'
}