artifacts.gradle

import groovy.xml.MarkupBuilder

apply plugin: 'maven-publish'

// Task to generate our public.xml file
// See https://developer.android.com/studio/projects/android-library.html#PrivateResources
// We assume resources within res-public are public
task generatepublicxml {

    def resDir = project.projectDir.absolutePath + "/src/main/res"
    def publicDir = resDir + "-public"
    def resFolder = file(resDir + "/values")
    def publicFolder = file(publicDir + "/values")
    if (!publicFolder.exists()) {
        // No res; no need for contents
        if (!resFolder.exists()) {
            return
        }
        publicFolder.mkdirs()
    }

    // Include the desired res types
    // Note: we don't need the qualified resource directories,
    // since those resources will already be defined in the unqualified directories
    // however, there are special cases like transition-v21 that is only available on lollipop and up
    def tree = fileTree(dir: publicDir,
            includes: ['**/anim/*.xml',
                       '**/color/*.xml',
                       '**/drawable/*.xml',
                       '**/layout/*.xml',
                       '**/transition-v21/*.xml',
                       '**/values/*.xml'
            ],
            exclude: '**/public.xml'
    )

    println "Generating public XML: ${project.name}"

    // Create new public.xml with writer
    file(publicDir + "/values/public.xml").withWriter { writer ->
        // Create MarkupBuilder with 4 space indent
        def destXml = new MarkupBuilder(new IndentPrinter(writer, "    ", true))
        def destXmlMkp = destXml.getMkp()

        // GIST NOTE: our project needed the ResourceName suppression, but it's not needed in general
        destXml.resources(
                'xmlns:tools': 'http://schemas.android.com/tools',
                'tools:ignore': 'ResourceName'
        ) {
            // Leave file comment
            destXmlMkp.yield "\r\n"
            destXmlMkp.comment("AUTO-GENERATED FILE. DO NOT MODIFY. public.xml is generated by the generatepublicxml gradle task")

            if (tree.isEmpty())
                "public"("name": "dummy", "type": "id")
            else
                tree.each { resFile ->

                    // use the directory name to get the type
                    String type = resFile.getParentFile().getName()

                    if (type == "values") {
                        // Resource files under values. Parse the file, and pull out the resource definitions
                        def parsePublicResources = new XmlParser().parse(resFile)
                        parsePublicResources.children().each {

                            // Type is usually the element, but sometimes a type attribute is present
                            // example: <item name="line_spacing_multiplier" format="float" type="dimen">1.4</item>
                            type = it.name()
                            if (it.@type) {
                                type = it.@type
                            }

                            // it.@name is value in name=
                            "public"("name": it.@name, "type": type)
                        }
                    } else {
                        // Drawable, layout, etc files
                        "public"("name": resFile.getName().tokenize('.')[0], "type": type.tokenize('-')[0])
                    }
                }
        }
    }
}

afterEvaluate {
    publishing {
        publications {
            release(MavenPublication) {
                from components.release
                groupId = group
                artifactId = project.name
            }
        }
    }
}

build.dependsOn generatepublicxml