Android Gradle源码分析

本文主要是介绍Android Gradle源码分析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

一.如何调试Android Gradle源码

最简单的方式如下：
1.配置 gradle.properties
比较方便的做法是配置全局的 gradle.properties，这样对所有 Gradle 工具都适用，配置文件位于 ~/.gradle/gradle.properties，在 gradle.properties 文件中加上 org.gradle.jvmargs 属性：

org.gradle.jvmargs=-XX:MaxPermSize=4g -XX:+HeapDumpOnOutOfMemoryError -Xmx4g -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5006

2.启动 Gradle Daemon 进程

$ ./gradlew --stop     # 先停掉 daemon 进程
$ ./gradlew --daemon   # 启动 daemon 进程

3.Attach daemon 进程

然后，选择 Gradle Daemon 进程，如下图所示：

4.新建一个空的module
删除所有其他文件，只留如下2个文件

gradle文件配置如下

apply plugin: 'groovy'dependencies {implementation gradleApi()implementation localGroovy()implementation 'com.android.tools.build:gradle:3.5.0'
}

这样就引入了源码，想看对应版本的源码，改变相应的引用即可
保持和classpath声明的一致

 classpath 'com.android.tools.build:gradle:3.5.0'

5.放断点
在相应的代码行放上断点

6.运行构建，开始调试

在命令行中执行相应的 Task，例如：

$ ./gradlew assembleDebug

二.Gralde Plugin源码分析

平时我们使用plugin都是通过apply方法，例如：

apply plugin: 'com.android.application'

所以我们就从apply方法入手

1.AppPlugin#apply


从上面得知 ‘com.android.application’ 对应com.android.build.gradle.AppPlugin

AppPlugin继承自AbstractAppPlugin，AbstractAppPlugin继承自BasePlugin

2.BasePlugin#apply

  @Overridepublic final void apply(@NonNull Project project) {CrashReporting.runAction(() -> {basePluginApply(project);pluginSpecificApply(project);});}

3.BasePlugin#basePluginApply

private void basePluginApply(@NonNull Project project) {// We run by default in headless mode, so the JVM doesn't steal focus.System.setProperty("java.awt.headless", "true");this.project = project;this.projectOptions = new ProjectOptions(project);checkGradleVersion(project, getLogger(), projectOptions);DependencyResolutionChecks.registerDependencyCheck(project, projectOptions);project.getPluginManager().apply(AndroidBasePlugin.class);checkPathForErrors();checkModulesForErrors();PluginInitializer.initialize(project);RecordingBuildListener buildListener = ProfilerInitializer.init(project, projectOptions);ProfileAgent.INSTANCE.register(project.getName(), buildListener);threadRecorder = ThreadRecorder.get();Workers.INSTANCE.initFromProject(projectOptions,// possibly, in the future, consider using a pool with a dedicated size// using the gradle parallelism settings.ForkJoinPool.commonPool());ProcessProfileWriter.getProject(project.getPath()).setAndroidPluginVersion(Version.ANDROID_GRADLE_PLUGIN_VERSION).setAndroidPlugin(getAnalyticsPluginType()).setPluginGeneration(GradleBuildProject.PluginGeneration.FIRST).setOptions(AnalyticsUtil.toProto(projectOptions));if (!projectOptions.get(BooleanOption.ENABLE_NEW_DSL_AND_API)) {threadRecorder.record(ExecutionType.BASE_PLUGIN_PROJECT_CONFIGURE,project.getPath(),null,this::configureProject);threadRecorder.record(ExecutionType.BASE_PLUGIN_PROJECT_BASE_EXTENSION_CREATION,project.getPath(),null,this::configureExtension);threadRecorder.record(ExecutionType.BASE_PLUGIN_PROJECT_TASKS_CREATION,project.getPath(),null,this::createTasks);} else {// Apply the Java pluginproject.getPlugins().apply(JavaBasePlugin.class);// create the delegateProjectWrapper projectWrapper = new ProjectWrapper(project);PluginDelegate<E> delegate =new PluginDelegate<>(project.getPath(),project.getObjects(),project.getExtensions(),project.getConfigurations(),projectWrapper,projectWrapper,project.getLogger(),projectOptions,getTypedDelegate());delegate.prepareForEvaluation();// after evaluate callbacksproject.afterEvaluate(CrashReporting.afterEvaluate(p -> {threadRecorder.record(ExecutionType.BASE_PLUGIN_CREATE_ANDROID_TASKS,p.getPath(),null,delegate::afterEvaluate);}));}}

threadRecoirder.recode()是记录最后一个参数的路径和执行的时间点，前面做了一些必要性的信息检测之前，其实主要做了以下几件事情：

// 配置项目，设置构建回调
this::configureProject
// 配置Extension
this::configureExtension
// 创建任务
this::createTasks

4.configureProject

 private void configureProject() {final Gradle gradle = project.getGradle();ObjectFactory objectFactory = project.getObjects();extraModelInfo = new ExtraModelInfo(project.getPath(), projectOptions, project.getLogger());final SyncIssueHandler syncIssueHandler = extraModelInfo.getSyncIssueHandler();SdkComponents sdkComponents =SdkComponents.Companion.createSdkComponents(project,projectOptions,// We pass a supplier here because extension will only be set later.this::getExtension,getLogger(),syncIssueHandler);dataBindingBuilder = new DataBindingBuilder();dataBindingBuilder.setPrintMachineReadableOutput(SyncOptions.getErrorFormatMode(projectOptions) == ErrorFormatMode.MACHINE_PARSABLE);if (projectOptions.hasRemovedOptions()) {syncIssueHandler.reportWarning(Type.GENERIC, projectOptions.getRemovedOptionsErrorMessage());}if (projectOptions.hasDeprecatedOptions()) {extraModelInfo.getDeprecationReporter().reportDeprecatedOptions(projectOptions.getDeprecatedOptions());}if (!projectOptions.getExperimentalOptions().isEmpty()) {projectOptions.getExperimentalOptions().forEach(extraModelInfo.getDeprecationReporter()::reportExperimentalOption);}// Enforce minimum versions of certain pluginsGradlePluginUtils.enforceMinimumVersionsOfPlugins(project, syncIssueHandler);// Apply the Java pluginproject.getPlugins().apply(JavaBasePlugin.class);DslScopeImpl dslScope =new DslScopeImpl(syncIssueHandler, extraModelInfo.getDeprecationReporter(), objectFactory);@NullableFileCache buildCache = BuildCacheUtils.createBuildCacheIfEnabled(project, projectOptions);globalScope =new GlobalScope(project,creator,new ProjectWrapper(project),projectOptions,dslScope,sdkComponents,registry,buildCache,extraModelInfo.getMessageReceiver());project.getTasks().named("assemble").configure(task ->task.setDescription("Assembles all variants of all applications and secondary packages."));// call back on execution. This is called after the whole build is done (not// after the current project is done).// This is will be called for each (android) projects though, so this should support// being called 2+ times.gradle.addBuildListener(new BuildListener() {@Overridepublic void buildStarted(@NonNull Gradle gradle) {}@Overridepublic void settingsEvaluated(@NonNull Settings settings) {}@Overridepublic void projectsLoaded(@NonNull Gradle gradle) {}@Overridepublic void projectsEvaluated(@NonNull Gradle gradle) {}@Overridepublic void buildFinished(@NonNull BuildResult buildResult) {// Do not run buildFinished for included project in composite build.if (buildResult.getGradle().getParent() != null) {return;}ModelBuilder.clearCaches();Workers.INSTANCE.shutdown();sdkComponents.unload();SdkLocator.resetCache();threadRecorder.record(ExecutionType.BASE_PLUGIN_BUILD_FINISHED,project.getPath(),null,() -> {if (!projectOptions.get(BooleanOption.KEEP_

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