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

I am running the new Android Studio 3.0-beta7, and tried to use @nicopico's answer, but it failed with a number of different errors, so here's an adaptation of it that doesn't rely on the non-existent java.nio utilities.

task javadoc(type: Javadoc) {
    failOnError false
    source = android.sourceSets.main.java.srcDirs
    // Also add the generated R class to avoid errors...
    // TODO: debug is hard-coded
    source += "$buildDir/generated/source/r/debug/"
    // ... but exclude the R classes from the docs
    excludes += "**/R.java"

    // TODO: "compile" is deprecated in Gradle 4.1, 
    // but "implementation" and "api" are not resolvable :(
    classpath += configurations.compile

    afterEvaluate {
        // Wait after evaluation to add the android classpath
        // to avoid "buildToolsVersion is not specified" error
        classpath += files(android.getBootClasspath())

        // Process AAR dependencies
        def aarDependencies = classpath.filter { it.name.endsWith('.aar') }
        classpath -= aarDependencies
        aarDependencies.each { aar ->
            System.out.println("Adding classpath for aar: " + aar.name)
            // Extract classes.jar from the AAR dependency, and add it to the javadoc classpath
            def outputPath = "$buildDir/tmp/exploded-aar/${aar.name.replace('.aar', '.jar')}"
            classpath += files(outputPath)

            // Use a task so the actual extraction only happens before the javadoc task is run
            dependsOn task(name: "extract ${aar.name}").doLast {
                extractEntry(aar, 'classes.jar', outputPath)
            }
        }
    }
}

// Utility method to extract only one entry in a zip file
private def extractEntry(archive, entryPath, outputPath) {
    if (!archive.exists()) {
        throw new GradleException("archive $archive not found")
    }

    def zip = new java.util.zip.ZipFile(archive)

    zip.entries().each {
        if (it.name == entryPath) {
            def path = new File(outputPath)

            if (!path.exists()) {
                path.getParentFile().mkdirs()

                // Surely there's a simpler is->os utility except
                // the one in java.nio.Files? Ah well...
                def buf = new byte[1024]
                def is = zip.getInputStream(it)
                def os = new FileOutputStream(path)
                def len

                while ((len = is.read(buf)) != -1) {
                    os.write(buf, 0, len)
                }
                os.close()
            }
        }
    }
    zip.close()
}

It bothers me that we need all this code to produce a freaking javadoc for a library, but at least I got this working. However, I do need to find a workaround for configuration.api and configuration.implementation not being resolvable.

Answer 2

This only works for Android Studio older than 2.3 and/or Gradle older than 3.3

To add the JARs from the AARs you can add the following doFirst to the javadoc task:

task javadoc(type: Javadoc) {
    source = android.sourceSets.main.java.srcDirs
}
.doFirst {
    classpath += fileTree(dir: "$buildDir/intermediates/exploded-aar/", include:"**/classes.jar")
}

It will add all .jar files from all the AARs to the javadoc classpath. (option 1 from your proposed solutions)

Answer 3

I managed to automate the solution of Guillaume Perrot by extracting the classes.jar contained in each AAR file, and adding it to the classpath of the javadoc task.

It seems to work for AAR dependencies and AAR modules on Android Studio 2.3 and Gradle 3.3

import java.nio.file.Files
import java.nio.file.Paths
import java.io.FileOutputStream
import java.util.zip.ZipFile

task javadoc(type: Javadoc) {
    source = android.sourceSets.main.java.srcDirs
    classpath += configurations.compile
    classpath += configurations.provided

    afterEvaluate {
        // Wait after evaluation to add the android classpath
        // to avoid "buildToolsVersion is not specified" error
        classpath += files(android.getBootClasspath())

        // Process AAR dependencies
        def aarDependencies = classpath.filter { it.name.endsWith('.aar') }
        classpath -= aarDependencies
        aarDependencies.each { aar ->
            // Extract classes.jar from the AAR dependency, and add it to the javadoc classpath
            def outputPath = "$buildDir/tmp/aarJar/${aar.name.replace('.aar', '.jar')}"
            classpath += files(outputPath)

            // Use a task so the actual extraction only happens before the javadoc task is run
            dependsOn task(name: "extract ${aar.name}").doLast {
                extractEntry(aar, 'classes.jar', outputPath)
            }
        }
    }
}

// Utility method to extract only one entry in a zip file
private def extractEntry(archive, entryPath, outputPath) {
    if (!archive.exists()) {
        throw new GradleException("archive $archive not found")
    }

    def zip = new ZipFile(archive)
    zip.entries().each {
        if (it.name == entryPath) {
            def path = Paths.get(outputPath)
            if (!Files.exists(path)) {
                Files.createDirectories(path.getParent())
                Files.copy(zip.getInputStream(it), path)
            }
        }
    }
    zip.close()
}

Answer 4

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'
}

Answer 5

The solution from @rve is now broken on Android Studio 2.3 / Gradle 3.3 as the exploded-aar no longer exists (with no alternative inside the build directory).

If the aar you depend on is not a module in your project, you will need first to extract the classes.jar before referencing it in the classpath (basically re-create intermediates/exploded-aar manually).

If the aar you depend on is just another module in your project you can also make your javadoc task depends on the compile task of that module and reference the intermediates/classes/release of that module (if you make javadoc depends on assembleRelease for example). An example of that workaround: https://github.com/Microsoft/mobile-center-sdk-android/pull/345/files

I really wish someone comes up with a better solution though.