从零开始写gradle插件

一。在as中新建module如下

image.png

apply plugin: 'groovy'
apply plugin: 'maven'

dependencies {
    //gradle sdk
    compile gradleApi()
    //groovy sdk
    compile localGroovy()
    compile "com.android.tools.build:gradle:$localBuildToolsVersion"
    compile 'com.android.tools.build:transform-api:1.5.0'
    compile 'org.aspectj:aspectjrt:1.8.10'

}


repositories {
    mavenCentral()
}
//以上都为固定写法

//group和version
group='com.col.decypt_fixer'
version='1.0.0'

//打包到本地或者远程Maven库
uploadArchives {
    repositories {
        mavenDeployer {
            //提交到远程服务器：
            // repository(url: "http://www.xxx.com/repos") {
            //    authentication(userName: "admin", password: "admin")
            // }
            //本地的Maven地址设置为E:/Maven
            repository(url: "file:../aop-tech/repositories")
        }
    }
}

com.col.decypt_fixer.properties里面的
implementation-class=com.col.decypt_fixer.LibChanger能跳转才说明结构正确。

插件作用，在transformNativeLibsWithStripDebugSymbolForApiTestRelease之后，packageApiTestRelease之前，替换.so库。

Task :app:transformNativeLibsWithStripDebugSymbolForApiTestRelease
Task :app:validateSigningApiTestRelease
Task :app:packageApiTestRelease

class LibChanger implements Plugin<Project> {


    @Override
    void apply(Project project) {
        println("Plugin Start_________________________________________________________________")

        if (project.plugins.hasPlugin(AppPlugin)) {
            AppExtension android = project.extensions.getByType(AppExtension)
//            android.registerTransform(new LibChangerTransform(project))

            //创建一个Extension，名字叫做testCreatJavaConfig 里面可配置的属性参照MyPlguinTestClass
            project.extensions.create("libChanger", MyPluginTestClass)

            android.applicationVariants.all { variant ->   //设置task依赖于生成BuildConfig的task，然后在生成BuildConfig后生成我们的类

                //获取到scope,作用域
                def variantData = variant.variantData
                def scope = variantData.scope

                //拿到build.gradle中创建的Extension的值
                def config = project.extensions.getByName("libChanger")

                println("Plugin Start______${variantData}______________${scope}_____________________________________________")
                if (!variantData.toString().contains("ApiTestRelease")) return
//                println("Plugin Start______${variant.getVariantData().getTaskName("transform", "release")}______________________________________________________")


                //创建一个task
                def createTaskName = scope.getTaskName("col", "LibChangerPlugin")
                def createTask = project.task(createTaskName)

                File debugSoFile = null
                String outPath = null

                def oriTask = project.tasks.getByName("transformNativeLibsWithStripDebugSymbolForApiTestRelease")
                println("Plugin Start______${oriTask}______________________________________________________")
//                println("Plugin Start______${oriTask.inputs}_________________________${oriTask.outputs}_____________________________")

                oriTask.inputs.each { input ->
                    println("Plugin Start______input: ${input.properties}______________________________________________________")
                }
                oriTask.inputs.files.each { file ->
                    println("Plugin Start______input: ${file.absolutePath}______________________________________________________")
                    if (!file.absolutePath.endsWith("armeabi-v7a" + File.separator + "libjni-lib.so")) return

                    debugSoFile = file
                }
                oriTask.outputs.files.each { file ->
                    println("Plugin Start______output: ${file.absolutePath}______________________________________________________")
                    outPath = file.absolutePath

                }

                //设置task要执行的任务
                createTask.doLast {
                    //生成java类
                    println("设置task要执行的任务_____________________________________________")

                    def lastIndexOf = outPath.indexOf("reader_sh_as")
                    println("lastIndexOf---------------------------------------- " + lastIndexOf)
                    if (lastIndexOf == -1) return

                    def rootPath = outPath.substring(0, lastIndexOf + "project_name".length() + 1)
                    println("rootPath---------------------------------------- " + rootPath)
                    debugSoFile = new File(rootPath + File.separator
                            + "jni_lib" + File.separator
                            + "libjni-lib_debug.so"
                    )

                    if (outPath == null || outPath.length() == 0) return
                    if (debugSoFile == null) return

                    def releaseSoFile = new File(outPath + File.separator
                            + "0" + File.separator
                            + "lib" + File.separator
                            + "armeabi-v7a" + File.separator
                            + "libjni-lib.so")

                    println("directoryInput---------------------------------------- " + debugSoFile.exists() + " " + releaseSoFile.exists())
                    if (!debugSoFile.exists() || !releaseSoFile.exists()) return
                    println(debugSoFile.absolutePath + " -------------------\n--------------------- " + releaseSoFile.absolutePath)
                    println(" ---------------------------------------- " + debugSoFile.exists() + " " + releaseSoFile.exists())
                    println(" ---------------------------------------- " + FileUtils.checksumCRC32(debugSoFile) + " " + FileUtils.checksumCRC32(releaseSoFile))

                    FileUtils.copyFile(debugSoFile, releaseSoFile)
                    println(" ---------------------------------------- " + FileUtils.checksumCRC32(debugSoFile) + " " + FileUtils.checksumCRC32(releaseSoFile))

                }

                if (oriTask) {
                    createTask.dependsOn oriTask
                    oriTask.finalizedBy createTask
                }
            }
        }

    }

}

class MyPluginTestClass {
    def str = "默认值";
}

二。运行uploadArchives的gradle任务，会在配置的目录生成

image.png

三。引用
在project的根目录build.gradle引入

buildscript {
 dependencies {
classpath 'com.col.decypt_fixer:decypt_fixer:1.0.0'

在需要调用插件的地方

apply plugin: 'com.android.application'
apply plugin: 'com.col.decypt_fixer'

四。编译时查看日志。
如果plugin的代码有问题，编译生成plugin时不会报错，宿主运行时会报错。
要先注释掉apply plugin: 'com.col.decypt_fixer'再修改运行uploadArchives

五。Transform插件
Transform API 是在1.5.0-beta1版开始使用，利用Transform API，第三方的插件可以在.class文件转为dex文件之前，对一些.class 文件进行处理。Transform API 简化了这个处理过程，而且使用起来很灵活。

注意getScopes和getReferencedScopes的区别

参考：
https://github.com/HujiangTechnology/gradle_plugin_android_aspectjx
https://www.jianshu.com/p/811b0d0975ef