gradle - 如何使用 "api"或 "implementation"指令从 gradle 插件获取依赖项

Question

背景:运行 Android Studio 3.0-beta7 并尝试让 javadoc 任务为 Android 库工作(事实上，这首先不能作为现成的任务提供，这真的很奇怪)，我设法调整了一个根据我的需要回答一个不同的问题，最后得到这个代码( https://stackoverflow.com/a/46810617/1226020 ):

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()
}

此代码尝试查找所有依赖项 AAR:s，遍历它们并从中提取 classes.jar，并将它们放入在 javadoc 生成期间添加到类路径的临时文件夹中。基本上是试图重现真正旧的 android gradle 插件曾经用“exploded-aar”做的事情。

但是，代码依赖于使用 compile依赖关系。使用 api或 implementation Gradle 4.1 推荐的那些将不起作用，因为这些不能从 Gradle 任务中解决。

问题:如何使用 api 获取依赖项列表或 implementation指令，例如 configuration.api呈现“无法解决”的错误？

额外问题:是否有一种新的、更好的方法来为使用 Android Studio 3.0 的库创建 javadoc，而不涉及 100 行解决方法？

Answer 1

您可以等待合并:

https://issues.apache.org/jira/browse/MJAVADOC-450

基本上，当前的 Maven Javadoc 插件忽略了 AAR 等分类器。