文章目录

  • Task17: javaPreCompileDebug
    • 1. input/ouput
    • 2. 验证
    • 3. 核心类(JavaPreCompileTask)
  • Task18:compileDebugJavaWithJavac
    • 1. input/output
    • 2. 核心类(AndroidJavaCompile)
    • 3. AndroidJavaCompile
  • Task19:compileDebugNdk
    • 1. input/output
    • 2. 核心类(NdkCompile)
  • Task20:compileDebugSources
  • Task21:mergeDebugShaders
    • 1. input/ouput
    • 2. 核心类(MergeSourceSetFolders)
      • 2.1 MergeShaderSourceFoldersConfigAction.java
      • 2.2 MergeSourceSetFolders.java
  • Task22: compileDebugShaders
    • 1. input/ouput
    • 2. 核心类(ShaderCompile)
    • 3. 调用路径
  • Task23: mergeDebugAssets
    • 1. input/ouput
    • 2. 核心类(MergeAppAssetConfigAction、MergeSourceSetFolders)

Task17: javaPreCompileDebug

1. input/ouput

taskName:javaPreCompileDebug
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/appcompat-v7-26.1.0.aar/2774ea4f1cf1e83a6ad8e8d3c8b463b6/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/constraint-layout-1.1.3.aar/f43c0ba95b6494825ed940fc4f04662b/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/animated-vector-drawable-26.1.0.aar/559112320064089dfaf6780e71d5b44f/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-vector-drawable-26.1.0.aar/c2c3ad4abfd49316f6769b8238b0f010/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-v4-26.1.0.aar/9ac5f97e8ccb24c52b7cbb6202c12ad0/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-media-compat-26.1.0.aar/53ab5ad72634f3497309a8788f3ca200/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-fragment-26.1.0.aar/7e6a4ce6591d722d47aafc36d980f8b4/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-core-utils-26.1.0.aar/4c474caa9ac1f01c4936bd96905ecacd/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-core-ui-26.1.0.aar/868eaa7e0c620cd85d72ad4f340e8bb1/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-compat-26.1.0.aar/4ec3c1c46e5bad9ac3b91f45a2afec3e/jars/classes.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.android.support/support-annotations/26.1.0/814258103cf26a15fcc26ecce35f5b7d24b73f8/support-annotations-26.1.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.android.support.constraint/constraint-layout-solver/1.1.3/bde0667d7414c16ed62d3cfe993cff7f9d732373/constraint-layout-solver-1.1.3.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/runtime-1.0.0.aar/5b2333922ba05b1f174de51739b24d14/jars/classes.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/android.arch.lifecycle/common/1.0.0/e414a4cb28434e25c4f6aa71426eb20cf4874ae9/common-1.0.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/android.arch.core/common/1.0.0/a2d487452376193fc8c103dd2b9bd5f2b1b44563/common-1.0.0.jar
=========================================================
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/annotation_processor_list/debug/javaPreCompileDebug/annotationProcessors.json

从日志可以看出该任务是生成一个annotationProcessors.json文件，该文件记录了主工程所依赖的注解处理器库

2. 验证

在build.gradle添加

dataBinding {enabled = true
}

重新执行打包，可以看到该json文件中记录了databinding-compiler-3.2.0.jar
因为databindg原理也是基于APT技术实现，而其实现类就是记录文件中的jar

3. 核心类(JavaPreCompileTask)

...@VisibleForTesting static final String DATA_BINDING_SPEC = "android.databinding.DataBinding";private static final String PROCESSOR_SERVICES ="META-INF/services/javax.annotation.processing.Processor";private File processorListFile;...@TaskAction
public void preCompile() throws IOException {boolean grandfathered = annotationProcessorOptions.getIncludeCompileClasspath() != null;Collection<ResolvedArtifactResult> compileProcessors = null;if (!grandfathered) {// 1. 搜集compileClasspaths中涉及到注解处理器compileProcessors = collectAnnotationProcessors(compileClasspaths);FileCollection annotationProcessors =annotationProcessorConfiguration.getArtifactFiles();compileProcessors =compileProcessors.stream().filter(artifact -> !annotationProcessors.contains(artifact.getFile())).collect(Collectors.toList());// 如果发现编译类路径存在包含注解处理器的jar，则抛出异常// 此处新手集成butterknife经常会遇到，原因是没有使用annotationProcessor配置引用if (!compileProcessors.isEmpty()) {String message ="Annotation processors must be explicitly declared now.  The following "+ "dependencies on the compile classpath are found to contain "+ "annotation processor.  Please add them to the "+ annotationProcessorConfigurationName+ " configuration.\n  - "+ Joiner.on("\n  - ").join(convertArtifactsToNames(compileProcessors))+ "\nAlternatively, set "+ "android.defaultConfig.javaCompileOptions.annotationProcessorOptions.includeCompileClasspath = true "+ "to continue with previous behavior.  Note that this option "+ "is deprecated and will be removed in the future.\n"+ "See "+ "https://developer.android.com/r/tools/annotation-processor-error-message.html "+ "for more details.";if (isTestComponent) {getLogger().warn(message);} else {throw new RuntimeException(message);}}}// Get all the annotation processors for metrics collection.Set<String> classNames = Sets.newHashSet();// 一般是读取build.gralde中includeCompileClasspath属性值，如果true，执行扫描操作，开关打开会影响性能// Add the annotation processors on classpath only when includeCompileClasspath is true.if (Boolean.TRUE.equals(annotationProcessorOptions.getIncludeCompileClasspath())) {if (compileProcessors == null) {compileProcessors = collectAnnotationProcessors(compileClasspaths);}classNames.addAll(convertArtifactsToNames(compileProcessors));}// 2. 搜集所有注解处理器// Add all annotation processors on the annotation processor configuration.classNames.addAll(convertArtifactsToNames(collectAnnotationProcessors(annotationProcessorConfiguration)));// 3. 存储到集合中// Add the explicitly declared processors.// For metrics purposes, we don't care how they include the processor in their build.classNames.addAll(annotationProcessorOptions.getClassNames());// Add a generic reference to data binding, if present.if (dataBindingEnabled) {classNames.add(DATA_BINDING_SPEC);}// 3. 清理旧文件FileUtils.deleteIfExists(processorListFile);// 4. 写文件Gson gson = new GsonBuilder().create();try (FileWriter writer = new FileWriter(processorListFile)) {gson.toJson(classNames, writer);}
}

可以看到该任务是遍历所有jar，判断jar中META-INF//services目录中是否存在javax.annotation.processing.Processor文件，如果存在记录下，并保存到json文件中；注意下：JavaPreCompileTask只是继承类AndroidBuilderTask类，并不支持增量更新操作，但带有 Gradle-CacheableTask注解，所以其实是有缓存的,

/*** Returns a List of packages in the configuration believed to contain an annotation processor.** <p>We assume a package has an annotation processor if it contains the* META-INF/services/javax.annotation.processing.Processor file.*/private static List<ResolvedArtifactResult> collectAnnotationProcessors(ArtifactCollection configuration) {List<ResolvedArtifactResult> processors = Lists.newArrayList();for (ResolvedArtifactResult artifact : configuration) {File file = artifact.getFile();if (!file.exists()) {continue;}if (file.isDirectory()) {if (new File(file, PROCESSOR_SERVICES).exists()) {processors.add(artifact);}} else {try (JarFile jarFile = new JarFile(file)) {JarEntry entry = jarFile.getJarEntry(PROCESSOR_SERVICES);//noinspection VariableNotUsedInsideIfif (entry != null) {processors.add(artifact);}} catch (IOException iox) {// Can happen when we encounter a folder instead of a jar; for instance, in// sub-modules. We're just displaying a warning, so there's no need to stop the// build here.}}}return processors;}

参考

  • https://developer.android.com/studio/build/dependencies?utm_source=android-studio#annotation_processor

Task18:compileDebugJavaWithJavac

1. input/output

taskName:compileDebugJavaWithJavac
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/annotation_processor_list/debug/javaPreCompileDebug/annotationProcessors.json
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/adapters-3.2.0.aar/49b3d7e4ab68d92f056ea8f56b33e9fb/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/library-3.2.0.aar/818ffb3fe5dc5eeb6b4e51c93615b7fb/jars/classes.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.android.databinding/baseLibrary/3.2.0/fb5f8492c36231104cd86feaefa723291504c0a6/baseLibrary-3.2.0.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/appcompat-v7-26.1.0.aar/2774ea4f1cf1e83a6ad8e8d3c8b463b6/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/constraint-layout-1.1.3.aar/f43c0ba95b6494825ed940fc4f04662b/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-v4-26.1.0.aar/9ac5f97e8ccb24c52b7cbb6202c12ad0/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-fragment-26.1.0.aar/7e6a4ce6591d722d47aafc36d980f8b4/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-core-utils-26.1.0.aar/4c474caa9ac1f01c4936bd96905ecacd/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/animated-vector-drawable-26.1.0.aar/559112320064089dfaf6780e71d5b44f/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-vector-drawable-26.1.0.aar/c2c3ad4abfd49316f6769b8238b0f010/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-media-compat-26.1.0.aar/53ab5ad72634f3497309a8788f3ca200/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-core-ui-26.1.0.aar/868eaa7e0c620cd85d72ad4f340e8bb1/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/support-compat-26.1.0.aar/4ec3c1c46e5bad9ac3b91f45a2afec3e/jars/classes.jar
input:/Users/apple/.gradle/caches/transforms-1/files-1.1/runtime-1.0.3.aar/5765c0929bc6bc40d70d6fc25f402f42/jars/classes.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/android.arch.lifecycle/common/1.0.3/7d7f60c4783872861222166f6164215f8951c7b1/common-1.0.3.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/android.arch.core/common/1.0.0/a2d487452376193fc8c103dd2b9bd5f2b1b44563/common-1.0.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.android.support/support-annotations/26.1.0/814258103cf26a15fcc26ecce35f5b7d24b73f8/support-annotations-26.1.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.android.support.constraint/constraint-layout-solver/1.1.3/bde0667d7414c16ed62d3cfe993cff7f9d732373/constraint-layout-solver-1.1.3.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/androidx.databinding/databinding-compiler/3.2.0/765e0039a232d79ab0251a27665184f5546a5cdd/databinding-compiler-3.2.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/androidx.databinding/databinding-compiler-common/3.2.0/b73212517c2f1c275a38dc9623e78ed020d7d887/databinding-compiler-common-3.2.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/androidx.databinding/databinding-common/3.2.0/8908b4818c8f5add9fb9e33130135e96be1bb6ab/databinding-common-3.2.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jre8/1.2.0/505f55b9619bbc5f5e26c77427dd24a6a441eef1/kotlin-stdlib-jre8-1.2.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/commons-io/commons-io/2.4/b1b6ea3b7e4aa4f492509a4952029cd8e48019ad/commons-io-2.4.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/commons-codec/commons-codec/1.9/9ce04e34240f674bc72680f8b843b1457383161a/commons-codec-1.9.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/org.antlr/antlr4/4.5.3/f35db7e4b2446e4174ba6a73db7bd6b3e6bb5da1/antlr4-4.5.3.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.googlecode.juniversalchardet/juniversalchardet/1.0.3/cd49678784c46aa8789c060538e0154013bb421b/juniversalchardet-1.0.3.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.google.guava/guava/23.0/c947004bb13d18182be60077ade044099e4f26f1/guava-23.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.squareup/javapoet/1.8.0/e858dc62ef484048540d27d36f3ec2177a3fa9b1/javapoet-1.8.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.android.tools.build.jetifier/jetifier-core/1.0.0-alpha10/9eb7027c383061de12f93aae7a22cbeb97832d2a/jetifier-core-1.0.0-alpha10.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.google.code.gson/gson/2.8.0/c4ba5371a29ac9b2ad6129b1d39ea38750043eff/gson-2.8.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.android.tools/annotations/26.2.0/e1c021729dcc35bfc5784a1def99021254f2d262/annotations-26.2.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jre7/1.2.0/ec8b969e26fbcf2265a4d1a1539c4d1d4c5af380/kotlin-stdlib-jre7-1.2.0.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.2.20/1ce9e25c74aade0aa039cce459f2906a8c8ffc8e/kotlin-stdlib-1.2.20.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.google.code.findbugs/jsr305/1.3.9/40719ea6961c0cb6afaeb6a921eaa1f6afd4cfdf/jsr305-1.3.9.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.google.errorprone/error_prone_annotations/2.0.18/5f65affce1684999e2f4024983835efc3504012e/error_prone_annotations-2.0.18.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/com.google.j2objc/j2objc-annotations/1.1/ed28ded51a8b1c6b112568def5f4b455e6809019/j2objc-annotations-1.1.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/org.codehaus.mojo/animal-sniffer-annotations/1.14/775b7e22fb10026eed3f86e8dc556dfafe35f2d5/animal-sniffer-annotations-1.14.jar
input:/Users/apple/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/src/main/java/com/gradle/task/demo/MainActivity.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/coreutils/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/v7/appcompat/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/compat/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/coreui/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/v4/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/fragment/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/graphics/drawable/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/graphics/drawable/animated/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/mediacompat/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/support/constraint/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/android/arch/lifecycle/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/com/gradle/task/demo/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/com/android/databinding/library/baseAdapters/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r/com/android/databinding/library/R.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/source/buildConfig/debug/com/gradle/task/demo/BuildConfig.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/source/aidl/debug/com/gradle/task/demo/IHelloAidlInterface.java
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/source/dataBinding/trigger/debug/android/databinding/layouts/DataBindingInfo.java
input:/Users/apple/Library/Android/sdk/platforms/android-26/android.jar
input:/Users/apple/Library/Android/sdk/build-tools/28.0.2/core-lambda-stubs.jar
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/feature_data_binding_base_feature_info/debug/dataBindingExportFeaturePackageIdsDebug/out
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/data_binding_base_class_log_artifact/debug/dataBindingGenBaseClassesDebug/out
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/data_binding_dependency_artifacts/debug/dataBindingMergeDependencyArtifactsDebug/out
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/data_binding_layout_info_type_merge/debug/mergeDebugResources/out
=========================================================
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/generated/source/apt/debug
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/data-binding/debug/bundle-bin

该任务主要对Java源文件进行编译生成class字节码文件操作
从日志可以看出该任务输入包含以下几种类型

  1. 依赖的第三方库(aar)中的jar文件
  2. App本身的java源文件
  3. App中包含的AIDL编译生成的java文件
  4. AAPT生成的R.java
  5. BuildConfig.java
  6. DataBinding生成的DataBindingInfo.java文件
  7. android.jar

输出结果：

  • apt工具生成的java类
  • 输入中所有java文件都会编译成class文件(R.class、BuildConfig.class、 BR.class 、DataBinderMapperImpl.class等)

2. 核心类(AndroidJavaCompile)

JavaCompileConfigAction
该类中的execute方法主要是对AndroidJavaCompile任务做写初始化，比如设置compileSdkVersion等

@Override
public void execute(@NonNull final AndroidJavaCompile javacTask) {scope.getTaskContainer().setJavacTask(javacTask);final GlobalScope globalScope = scope.getGlobalScope();final Project project = globalScope.getProject();BuildArtifactsHolder artifacts = scope.getArtifacts();boolean isDataBindingEnabled = globalScope.getExtension().getDataBinding().isEnabled();// 1. 设置compileSdkVersionjavacTask.compileSdkVersion = globalScope.getExtension().getCompileSdkVersion();javacTask.mInstantRunBuildContext = scope.getInstantRunBuildContext();// We can't just pass the collection directly, as the instanceof check in the incremental// compile doesn't work recursively currently, so every ConfigurableFileTree needs to be// directly in the source array.// 2. 添加java源文件路径for (ConfigurableFileTree fileTree: scope.getVariantData().getJavaSources()) {javacTask.source(fileTree);}javacTask.getOptions().setBootstrapClasspath(scope.getBootClasspath());FileCollection classpath = scope.getJavaClasspath(COMPILE_CLASSPATH, CLASSES);if (!globalScope.getProjectOptions().get(BooleanOption.ENABLE_CORE_LAMBDA_STUBS)&& scope.keepDefaultBootstrap()) {// adding android.jar to classpath, as it is not in the bootclasspath// 3. 编译需要依赖android framework相关API，所以需要添加classpath =classpath.plus(project.files(globalScope.getAndroidBuilder().getBootClasspath(false)));}javacTask.setClasspath(classpath);// 4. 设置java编译输出路径javacTask.setDestinationDir(artifacts.appendArtifact(InternalArtifactType.JAVAC, javacTask, "classes"));CompileOptions compileOptions = globalScope.getExtension().getCompileOptions();AbstractCompilesUtil.configureLanguageLevel(javacTask,compileOptions,globalScope.getExtension().getCompileSdkVersion(),scope.getJava8LangSupportType());javacTask.getOptions().setEncoding(compileOptions.getEncoding());Boolean includeCompileClasspath =scope.getVariantConfiguration().getJavaCompileOptions().getAnnotationProcessorOptions().getIncludeCompileClasspath();FileCollection processorPath =scope.getArtifactFileCollection(ANNOTATION_PROCESSOR, ALL, PROCESSED_JAR);if (Boolean.TRUE.equals(includeCompileClasspath)) {// We need the jar files because annotation processors require the resources.processorPath =processorPath.plus(scope.getJavaClasspath(COMPILE_CLASSPATH, PROCESSED_JAR));}javacTask.getOptions().setAnnotationProcessorPath(processorPath);boolean incremental = AbstractCompilesUtil.isIncremental(project,scope,compileOptions,null, /* processorConfiguration, JavaCompile handles annotation processor now */LOG);if (incremental) {LOG.verbose("Using incremental javac compilation for %1$s %2$s.",project.getPath(), scope.getFullVariantName());javacTask.getOptions().setIncremental(true);} else {LOG.verbose("Not using incremental javac compilation for %1$s %2$s.",project.getPath(), scope.getFullVariantName());}AnnotationProcessorOptions annotationProcessorOptions =scope.getVariantConfiguration().getJavaCompileOptions().getAnnotationProcessorOptions();if (!annotationProcessorOptions.getClassNames().isEmpty()) {javacTask.getOptions().getCompilerArgs().add("-processor");javacTask.getOptions().getCompilerArgs().add(Joiner.on(',').join(annotationProcessorOptions.getClassNames()));}if (!annotationProcessorOptions.getArguments().isEmpty()) {for (Map.Entry<String, String> arg :annotationProcessorOptions.getArguments().entrySet()) {javacTask.getOptions().getCompilerArgs().add("-A" + arg.getKey() + "=" + arg.getValue());}}javacTask.getOptions().getCompilerArgumentProviders().addAll(annotationProcessorOptions.getCompilerArgumentProviders());// 设置apt生成输出路径javacTask.getOptions().setAnnotationProcessorGeneratedSourcesDirectory(scope.getAnnotationProcessorOutputDir());javacTask.annotationProcessorOutputFolder = scope.getAnnotationProcessorOutputDir();// databinding相关配置if (isDataBindingEnabled) {// The data binding artifact is created through annotation processing, which is invoked// by the JavaCompile task. Therefore, we register JavaCompile as the generating task.artifacts.appendArtifact(InternalArtifactType.DATA_BINDING_ARTIFACT,ImmutableList.of(scope.getBundleArtifactFolderForDataBinding()),javacTask);}javacTask.processorListFile =artifacts.getFinalArtifactFiles(ANNOTATION_PROCESSOR_LIST);javacTask.variantName = scope.getFullVariantName();
}

3. AndroidJavaCompile

AndroidJavaCompile任务比较简单，就把源码全部贴出来把。

可以看到AndroidJavaCompile类继承了JavaCompile，它的任务主要是增加对java8兼容操作处理，编译耗时记录操作，创建apt的输出目录这三个动作

/** Specialization of the JavaCompile task to record execution time. */
@CacheableTask
public class AndroidJavaCompile extends JavaCompile {String compileSdkVersion;InstantRunBuildContext mInstantRunBuildContext;File annotationProcessorOutputFolder;BuildableArtifact processorListFile;String variantName;@PathSensitive(PathSensitivity.NONE)@InputFilespublic BuildableArtifact getProcessorListFile() {return processorListFile;}@OutputDirectorypublic File getAnnotationProcessorOutputFolder() {return annotationProcessorOutputFolder;}@Overrideprotected void compile(IncrementalTaskInputs inputs) {getLogger().info("Compiling with source level {} and target level {}.",getSourceCompatibility(),getTargetCompatibility());if (isPostN()) {// 1. 如果当前编译SDK版本大于N且与java8不兼容，直接抛出异常，没怎么看明白if (!JavaVersion.current().isJava8Compatible()) {throw new RuntimeException("compileSdkVersion '" + compileSdkVersion + "' requires "+ "JDK 1.8 or later to compile.");}}processAnalytics();// Create directory for output of annotation processor.FileUtils.mkdirs(annotationProcessorOutputFolder);mInstantRunBuildContext.startRecording(InstantRunBuildContext.TaskType.JAVAC);// 2. 执行java编译操作super.compile(inputs);// 3. 记录操作耗时mInstantRunBuildContext.stopRecording(InstantRunBuildContext.TaskType.JAVAC);}/** Read the processorListFile to add annotation processors used to analytics. */@VisibleForTestingvoid processAnalytics() {// 读取所有注解处理器的库的记录文件(annotationProcessors.json),生成一个list列表Gson gson = new GsonBuilder().create();List<String> classNames;try (FileReader reader =new FileReader(BuildableArtifactUtil.singleFile(processorListFile))) {classNames = gson.fromJson(reader, new TypeToken<List<String>>() {}.getType());} catch (IOException e) {throw new UncheckedIOException(e);}// 保存注解处理器依赖库编译后续apt操作String projectPath = getProject().getPath();GradleBuildVariant.Builder variant =ProcessProfileWriter.getOrCreateVariant(projectPath, variantName);for (String processorName : classNames) {AnnotationProcessorInfo.Builder builder = AnnotationProcessorInfo.newBuilder();builder.setSpec(processorName);variant.addAnnotationProcessors(builder);}}@Internalprivate boolean isPostN() {final AndroidVersion hash = AndroidTargetHash.getVersionFromHash(compileSdkVersion);return hash != null && hash.getApiLevel() >= 24;}
}

Task19:compileDebugNdk

1. input/output

taskName:compileDebugNdk
=========================================================
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/ndk/debug/Android.mk
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/ndk/debug/obj
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/ndk/debug/lib

该任务编译NDK
官方NDK入门-https://developer.android.com/ndk/guides

2. 核心类(NdkCompile)

@TaskAction
void taskAction(IncrementalTaskInputs inputs) throws IOException, ProcessException {FileTree sourceFileTree = getSource();Set<File> sourceFiles =sourceFileTree.matching(new PatternSet().exclude("**/*.h")).getFiles();File makefile = getGeneratedMakefile();if (isUseDeprecatedNdkFlag) {writeMakefile(sourceFiles, makefile);throw new RuntimeException(String.format("Error: Flag %s is no longer supported and will be removed in the next "+ "version of Android Studio.  Please switch to a supported "+ "build system.\n%s",BooleanOption.ENABLE_DEPRECATED_NDK.getPropertyName(),getAlternativesAndLeaseNotice(makefile, "#ndkCompile")));}if (isDeprecatedNdkCompileLeaseExpired) {writeMakefile(sourceFiles, makefile);// Normally, we would catch the user when they try to configure the NDK, but NDK do// not need to be configured by default.  Throw this exception during task execution in// case we miss it.throw new RuntimeException("Error: Your project contains C++ files but it is not using a supported "+ "native build system.\n"+ getAlternatives(null, ""));}if (sourceFiles.isEmpty()) {makefile.delete();FileUtils.cleanOutputDir(getSoFolder());FileUtils.cleanOutputDir(getObjFolder());return;}if (ndkDirectory == null || !ndkDirectory.isDirectory()) {throw new GradleException("NDK not configured.\n" +"Download the NDK from http://developer.android.com/tools/sdk/ndk/." +"Then add ndk.dir=path/to/ndk in local.properties.\n" +"(On Windows, make sure you escape backslashes, e.g. C:\\\\ndk rather than C:\\ndk)");}final ReferenceHolder<Boolean> generateMakeFile = ReferenceHolder.of(false);if (!inputs.isIncremental()) {getLogger().info("Unable do incremental execution: full task run");generateMakeFile.setValue(true);FileUtils.cleanOutputDir(getSoFolder());FileUtils.cleanOutputDir(getObjFolder());} else {// look for added or removed files *only*inputs.outOfDate(new Action<InputFileDetails>() {@Overridepublic void execute(InputFileDetails change) {if (change.isAdded()) {generateMakeFile.setValue(true);}}});inputs.removed(new Action<InputFileDetails>() {@Overridepublic void execute(InputFileDetails change) {generateMakeFile.setValue(true);}});}if (generateMakeFile.getValue()) {writeMakefile(sourceFiles, makefile);}getLogger().warn("Warning: Deprecated NDK integration enabled by "+ DEPRECATED_NDK_COMPILE_LEASE.getPropertyName()+ " flag in gradle.properties will be removed from Android Gradle "+ "plugin in the next version.\n"+ getAlternatives(makefile, "#ndkCompile"));// now buildrunNdkBuild(ndkDirectory, makefile);
}

从代码可以看出主要做了二件事

  1. writeMakefile（通过获取源native源文件，最终生成一个makefile）
  2. runNdkBuild (调用NDK工具包中ndk-build应用支持编译源文件)

Task20:compileDebugSources

没找到这个任务，感觉是个空任务

Task21:mergeDebugShaders

1. input/ouput

taskName:mergeDebugShaders
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/src/debug/shaders
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/src/main/shaders
=========================================================
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/incremental/mergeDebugShaders
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/shaders/debug

2. 核心类(MergeSourceSetFolders)

2.1 MergeShaderSourceFoldersConfigAction.java

public static class MergeShaderSourceFoldersConfigAction extends ConfigAction {public MergeShaderSourceFoldersConfigAction(@NonNull VariantScope scope) {super(scope);}@NonNull@Overridepublic String getName() {return scope.getTaskName("merge", "Shaders");}@Overridepublic void execute(@NonNull MergeSourceSetFolders mergeAssetsTask) {super.execute(mergeAssetsTask);BaseVariantData variantData = scope.getVariantData();final GradleVariantConfiguration variantConfig = variantData.getVariantConfiguration();final Function<SourceProvider, Collection<File>> assetDirFunction =SourceProvider::getShadersDirectories;//设置一些入参，和Task23类似，差异只是对应任务的Config配置不同mergeAssetsTask.assetSetSupplier =() -> variantConfig.getSourceFilesAsAssetSets(assetDirFunction);mergeAssetsTask.sourceFolderInputs =() -> variantConfig.getSourceFiles(assetDirFunction);mergeAssetsTask.setOutputDir(scope.getMergeShadersOutputDir());}}

2.2 MergeSourceSetFolders.java

@Override
protected void doFullTaskAction() throws IOException {// this is full run, clean the previous outputFile destinationDir = getOutputDir();FileUtils.cleanOutputDir(destinationDir);List<AssetSet> assetSets = computeAssetSetList();// create a new merger and populate it with the sets.AssetMerger merger = new AssetMerger();try {for (AssetSet assetSet : assetSets) {// set needs to be loaded.assetSet.loadFromFiles(getILogger());merger.addDataSet(assetSet);}// get the merged set and write it down.MergedAssetWriter writer = new MergedAssetWriter(destinationDir, workerExecutor);merger.mergeData(writer, false /*doCleanUp*/);// No exception? Write the known state.merger.writeBlobTo(getIncrementalFolder(), writer, false);} catch (MergingException e) {getLogger().error("Could not merge source set folders: ", e);merger.cleanBlob(getIncrementalFolder());throw new ResourceException(e.getMessage(), e);}}

Task22: compileDebugShaders

1. input/ouput

taskName:compileDebugShaders
=========================================================
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/shader_assets/debug/compileDebugShaders/out

或许有人会compileDebugShaders不是应该在Task21之前执行吗？怎么在之后？
我们可以从TaskManger.java类找到答案

// TaskManger.java
public void createShaderTask(@NonNull VariantScope scope) {// merge the shader folders together using the proper priority.MergeSourceSetFolders mergeShadersTask =taskFactory.create(new MergeSourceSetFolders.MergeShaderSourceFoldersConfigAction(scope));// TODO do we support non compiled shaders in aars?//mergeShadersTask.dependsOn( scope.getVariantData().prepareDependenciesTask);// compile the shadersShaderCompile shaderCompileTask =taskFactory.create(new ShaderCompile.ConfigAction(scope));shaderCompileTask.dependsOn(mergeShadersTask);scope.getTaskContainer().getAssetGenTask().dependsOn(shaderCompileTask);
}

代码可以看到ShareCompile任务依赖mergeShadersTask

2. 核心类(ShaderCompile)

@CacheableTask
public class ShaderCompile extends AndroidBuilderTask {private static final PatternSet PATTERN_SET = new PatternSet().include("**/*." + ShaderProcessor.EXT_VERT).include("**/*." + ShaderProcessor.EXT_TESC).include("**/*." + ShaderProcessor.EXT_TESE).include("**/*." + ShaderProcessor.EXT_GEOM).include("**/*." + ShaderProcessor.EXT_FRAG).include("**/*." + ShaderProcessor.EXT_COMP);@InputFiles@PathSensitive(PathSensitivity.RELATIVE)public FileTree getSourceFiles() {FileTree src = null;if (sourceDir.isDirectory()) {src = getProject().files(sourceDir).getAsFileTree().matching(PATTERN_SET);}return src == null ? getProject().files().getAsFileTree() : src;}@TaskActionprotected void compileShaders() throws IOException {// this is full run, clean the previous outputFile destinationDir = getOutputDir();FileUtils.cleanOutputDir(destinationDir);try {getBuilder().compileAllShaderFiles(sourceDir,getOutputDir(),defaultArgs,scopedArgs,ndkLocation,new LoggedProcessOutputHandler(getILogger()));} catch (Exception e) {throw  new RuntimeException(e);}}
}

从代码可以看出该任务就是扫描输入路径中所有如下格式文件进行编译

public static final String EXT_VERT = "vert";
public static final String EXT_TESC = "tesc";
public static final String EXT_TESE = "tese";
public static final String EXT_GEOM = "geom";
public static final String EXT_FRAG = "frag";
public static final String EXT_COMP = "comp";

3. 调用路径

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ShaderCompile.compileShaders
AndroidBuilder.compileAllShaderFiles
ShaderProcessor.call
LoggedProcessOutputHandler.handleOuput

Task23: mergeDebugAssets

1. input/ouput

taskName:mergeDebugAssets
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/shader_assets/debug/compileDebugShaders/out
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/src/main/assets
input:/Users/apple/work/project/AndroidGradleTaskDemo/app/src/debug/assets
=========================================================
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/incremental/mergeDebugAssets
output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/merged_assets/debug/mergeDebugAssets/out

该任务扫描app中assets中所有资源，mergeDebugAssets目录下的merger.xml记录了合并的数据集合
mergeDebugAssets.out保存了合并的所有assets文件

2. 核心类(MergeAppAssetConfigAction、MergeSourceSetFolders)

public static class MergeAppAssetConfigAction extends MergeAssetBaseConfigAction {public MergeAppAssetConfigAction(@NonNull VariantScope scope) {super(scope, InternalArtifactType.MERGED_ASSETS, true);}@NonNull@Overridepublic String getName() {return scope.getTaskName("merge", "Assets");}
}

@CacheableTask
public class MergeSourceSetFolders extends IncrementalTask {...@Overrideprotected void doFullTaskAction() throws IOException {// this is full run, clean the previous outputFile destinationDir = getOutputDir();FileUtils.cleanOutputDir(destinationDir);// 1. 计算app所有依赖的asset文件，存储到列表中(主app中在最前面)List<AssetSet> assetSets = computeAssetSetList();// create a new merger and populate it with the sets.AssetMerger merger = new AssetMerger();try {for (AssetSet assetSet : assetSets) {// set needs to be loaded.assetSet.loadFromFiles(getILogger());merger.addDataSet(assetSet);}// get the merged set and write it down.MergedAssetWriter writer = new MergedAssetWriter(destinationDir, workerExecutor);// 2. 借用AssetMerger进行asset文件合并处理merger.mergeData(writer, false /*doCleanUp*/);// 3. 生成merger.xml记录文件// No exception? Write the known state.merger.writeBlobTo(getIncrementalFolder(), writer, false);} catch (MergingException e) {getLogger().error("Could not merge source set folders: ", e);merger.cleanBlob(getIncrementalFolder());throw new ResourceException(e.getMessage(), e);}}
}

该任务和mergeDebugShaders逻辑流程相同，差异只是任务的input/ouput不同；

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