Android构建流程——篇七
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Android构建流程——篇七
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文章目錄
- Task24 transformClassesWithDexBuilderForDebug
- 1.input/ouput
- 2. 核心類(DexArchiveBuilderTransform,TransformTask)
- 2.1 processJarInput
- 2.2. convertToDexArchive
- 2.3 launchProcessing
- 3. 梳理下總體調用鏈路
- Task25 transformClassesWithMultidexlistForDebug
- 1. input/ouput
- 2. 核心類(D8MainDexListTransform)
- Task26 transformDexArchiveWithDexMergerForDebug
- 1. input/ouput
- 2. 核心類(DexMergerTransform)
- Task 27 mergeDebugJniLibFolders
- 1. input/output
- 2. 核心類(MergeJniLibFoldersConfigAction, MergeSourceSetFolders)
- Task28 transformNativeLibsWithMergeJniLibsForDebug
- 1. input/output
- 2. 核心類(MergeJavaResourcesTransform)
- 3. transform
Task24 transformClassesWithDexBuilderForDebug
1.input/ouput
taskName:transformClassesWithDexBuilderForDebug 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/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/android/support/coreutils/R.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/android/support/coreutils/R$bool.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/cl/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/android/databinding/layouts/DataBindingInfo.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/android/databinding/DataBindingComponent.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/com/gradle/task/demo/R.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/com/gradle/task/demo/MainActivity.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/com/gradle/task/demo/R$bool.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/com/gradle/task/demo/R$id.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/com/gradle/task/demo/IHelloAidlInterface$Stub.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/com/gradle/task/demo/R$mipmap.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/com/gradle/task/demo/DataBinderMapperImpl.class input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/com/gradle/task/demo/DataBinderMapperImpl$InnerBrLookup.class 省略... ========================================================= output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug從日志不難發現，輸入數據格式包含二類**.jar和javac編譯后.class**文件，該任務主要做了二件事情
關于D8功效果描述參加官方描述https://developer.android.com/studio/command-line/d8?hl=zh-cn
2. 核心類(DexArchiveBuilderTransform,TransformTask)
/*** Transform that converts CLASS files to dex archives, {@link* com.android.builder.dexing.DexArchive}. This will consume {@link TransformManager#CONTENT_CLASS},* and for each of the inputs, corresponding dex archive will be produced.** <p>This transform is incremental, only changed streams will be converted again. Additionally, if* an input stream is able to provide a list of individual files that were changed, only those files* will be processed. Their corresponding dex archives will be updated.*/ public class DexArchiveBuilderTransform extends Transform {@Overridepublic void transform(@NonNull TransformInvocation transformInvocation)throws TransformException, IOException, InterruptedException {List<DexArchiveBuilderCacheHandler.CacheableItem> cacheableItems = new ArrayList<>();....for (TransformInput input : transformInvocation.getInputs()) {for (DirectoryInput dirInput : input.getDirectoryInputs()) {logger.verbose("Dir input %s", dirInput.getFile().toString());// 1. 掃描Dir目錄對該目錄下的所有class文件進行D8編譯處理生產dex文件convertToDexArchive(transformInvocation.getContext(),dirInput,outputProvider,isIncremental,bootclasspathServiceKey,classpathServiceKey,additionalPaths);}for (JarInput jarInput : input.getJarInputs()) {logger.verbose("Jar input %s", jarInput.getFile().toString());// 2. 對項目中依賴的jar進行處理D8DesugaringCacheInfo cacheInfo =getD8DesugaringCacheInfo(desugarIncrementalTransformHelper,bootclasspath,classpath,jarInput);List<File> dexArchives =processJarInput(transformInvocation.getContext(),isIncremental,jarInput,outputProvider,bootclasspathServiceKey,classpathServiceKey,additionalPaths,cacheInfo);if (cacheInfo != D8DesugaringCacheInfo.DONT_CACHE && !dexArchives.isEmpty()) {cacheableItems.add(new DexArchiveBuilderCacheHandler.CacheableItem(jarInput,dexArchives,cacheInfo.orderedD8DesugaringDependencies));}}}// all work items have been submitted, now wait for completion.if (useGradleWorkers) {transformInvocation.getContext().getWorkerExecutor().await();} else {executor.waitForTasksWithQuickFail(true);}// if we are in incremental mode, delete all removed files.if (transformInvocation.isIncremental()) {for (TransformInput transformInput : transformInvocation.getInputs()) {removeDeletedEntries(outputProvider, transformInput);}}// 緩存對jar進行dex后的文件，存儲到用戶級別(/Users/${username}/.android/build-cache/{gradle_plugin_version})// 方便后續直接復用// and finally populate the caches.if (!cacheableItems.isEmpty()) {cacheHandler.populateCache(cacheableItems);}} }先看jar；如果是jar會調用processJarInput方法
2.1 processJarInput
@NonNull private List<File> processJarInput(@NonNull Context context,boolean isIncremental,@NonNull JarInput jarInput,@NonNull TransformOutputProvider transformOutputProvider,@NonNull ClasspathServiceKey bootclasspath,@NonNull ClasspathServiceKey classpath,@NonNull Set<File> additionalPaths,@NonNull D8DesugaringCacheInfo cacheInfo)throws Exception {if (!isIncremental || additionalPaths.contains(jarInput.getFile())) {Preconditions.checkState(jarInput.getFile().exists(),"File %s does not exist, yet it is reported as input. Try \n"+ "cleaning the build directory.",jarInput.getFile().toString());return convertJarToDexArchive(context,jarInput,transformOutputProvider,bootclasspath,classpath,cacheInfo);} else if (jarInput.getStatus() != Status.NOTCHANGED) {// 處理增量流程，可以先忽略// delete all preDex jars if they exists....}return ImmutableList.of(); }private List<File> convertJarToDexArchive(@NonNull Context context,@NonNull JarInput toConvert,@NonNull TransformOutputProvider transformOutputProvider,@NonNull ClasspathServiceKey bootclasspath,@NonNull ClasspathServiceKey classpath,@NonNull D8DesugaringCacheInfo cacheInfo)throws Exception {if (cacheInfo != D8DesugaringCacheInfo.DONT_CACHE) {File cachedVersion =cacheHandler.getCachedVersionIfPresent(toConvert, cacheInfo.orderedD8DesugaringDependencies);// 1. 判斷本地緩存（用戶級別）是否有jar，如果有直接copy，復用if (cachedVersion != null) {File outputFile = getOutputForJar(transformOutputProvider, toConvert, null);Files.copy(cachedVersion.toPath(),outputFile.toPath(),StandardCopyOption.REPLACE_EXISTING);// no need to try to cache an already cached version.return ImmutableList.of();}}// 2. 沒有緩存走該方法return convertToDexArchive(context,toConvert,transformOutputProvider,false,bootclasspath,classpath,ImmutableSet.of());}可以看到無論是jar還是class他們最終都會調用同一個方法convertToDexArchive，我們看看它到底做了什么
2.2. convertToDexArchive
private List<File> convertToDexArchive(@NonNull Context context,@NonNull QualifiedContent input,@NonNull TransformOutputProvider outputProvider,boolean isIncremental,@NonNull ClasspathServiceKey bootClasspath,@NonNull ClasspathServiceKey classpath,@NonNull Set<File> additionalPaths) {logger.verbose("Dexing %s", input.getFile().getAbsolutePath());ImmutableList.Builder<File> dexArchives = ImmutableList.builder();for (int bucketId = 0; bucketId < numberOfBuckets; bucketId++) {File preDexOutputFile;//1. 如果是輸入為dir，也即是javac編譯保存class文件目錄；生成存儲dex目錄if (input instanceof DirectoryInput) {preDexOutputFile =getOutputForDir(outputProvider, (DirectoryInput) input, bucketId);FileUtils.mkdirs(preDexOutputFile);} else {//2. 否則是jar,則構建一個輸出${INT}.jar文件preDexOutputFile = getOutputForJar(outputProvider, (JarInput) input, bucketId);}dexArchives.add(preDexOutputFile);DexConversionParameters parameters =new DexConversionParameters(input,bootClasspath,classpath,preDexOutputFile,numberOfBuckets,bucketId,minSdkVersion,dexOptions.getAdditionalParameters(),inBufferSize,outBufferSize,dexer,isDebuggable,isIncremental,java8LangSupportType,additionalPaths,new SerializableMessageReceiver(messageReceiver),isInstantRun);if (useGradleWorkers) {context.getWorkerExecutor().submit(DexConversionWorkAction.class,configuration -> {configuration.setIsolationMode(IsolationMode.NONE);configuration.setParams(parameters);});} else {executor.execute(() -> {ProcessOutputHandler outputHandler =new ParsingProcessOutputHandler(new ToolOutputParser(new DexParser(), Message.Kind.ERROR, logger),new ToolOutputParser(new DexParser(), logger),messageReceiver);ProcessOutput output = null;try (Closeable ignored = output = outputHandler.createOutput()) {// 無論是jar還是class最終都會走該方法launchProcessing(parameters,output.getStandardOutput(),output.getErrorOutput(),messageReceiver);} finally {if (output != null) {try {outputHandler.handleOutput(output);} catch (ProcessException e) {// ignore this one}}}return null;});}}return dexArchives.build();}可以看到無論是class還是jar最后都會執行launchProcessing方法，關鍵部分如下
2.3 launchProcessing
private static void launchProcessing(@NonNull DexConversionParameters dexConversionParameters,@NonNull OutputStream outStream,@NonNull OutputStream errStream,@NonNull MessageReceiver receiver)throws IOException, URISyntaxException {...logger.verbose("Dexing '" + inputPath + "' to '" + dexConversionParameters.output + "'");// 1， 此處根據inputPath判斷，如果是jar返回JarClassFileInput類型，否則視為DirectoryBasedClassFileInputtry (ClassFileInput input = ClassFileInputs.fromPath(inputPath);Stream<ClassFileEntry> entries = input.entries(bucketFilter)) {// 2. 核心代碼，此處調用D8DexArchiveBuilder類將jar或class文件進行編譯dexArchiveBuilder.convert(entries,Paths.get(new URI(dexConversionParameters.output)),dexConversionParameters.isDirectoryBased());} catch (DexArchiveBuilderException ex) {throw new DexArchiveBuilderException("Failed to process " + inputPath.toString(), ex);}} // D8DexArchiveBuilder.java public void convert(@NonNull Stream<ClassFileEntry> input, @NonNull Path output, boolean isIncremental)throws DexArchiveBuilderException {D8DiagnosticsHandler d8DiagnosticsHandler = new InterceptingDiagnosticsHandler();try {D8Command.Builder builder = D8Command.builder(d8DiagnosticsHandler);AtomicInteger entryCount = new AtomicInteger();input.forEach(entry -> {//1. 讀取每個class文件存儲到builder，為后續D8編譯器服務builder.addClassProgramData(readAllBytes(entry), D8DiagnosticsHandler.getOrigin(entry));entryCount.incrementAndGet();});if (entryCount.get() == 0) {// nothing to do here, just returnreturn;}OutputMode outputMode =isIncremental ? OutputMode.DexFilePerClassFile : OutputMode.DexIndexed;builder.setMode(compilationMode).setMinApiLevel(minSdkVersion).setIntermediate(true).setOutput(output, outputMode);if (desugaring) {builder.addLibraryResourceProvider(bootClasspath.getOrderedProvider());builder.addClasspathResourceProvider(classpath.getOrderedProvider());} else {builder.setDisableDesugaring(true);}// 2. D8編譯器進行編譯處理D8.run(builder.build(), MoreExecutors.newDirectExecutorService());} catch (Throwable e) {throw getExceptionToRethrow(e, d8DiagnosticsHandler);}}3. 梳理下總體調用鏈路
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.statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-nSq3ktPapsVygrng .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-nSq3ktPapsVygrng .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-nSq3ktPapsVygrng .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-nSq3ktPapsVygrng .note-edge{stroke-dasharray:5}#mermaid-svg-nSq3ktPapsVygrng .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-nSq3ktPapsVygrng .error-icon{fill:#522}#mermaid-svg-nSq3ktPapsVygrng .error-text{fill:#522;stroke:#522}#mermaid-svg-nSq3ktPapsVygrng .edge-thickness-normal{stroke-width:2px}#mermaid-svg-nSq3ktPapsVygrng .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-nSq3ktPapsVygrng .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-nSq3ktPapsVygrng .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-nSq3ktPapsVygrng .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-nSq3ktPapsVygrng .marker{fill:#333}#mermaid-svg-nSq3ktPapsVygrng .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-nSq3ktPapsVygrng {color: rgba(0, 0, 0, 0.75);font: ;}.class.jarhaveCachenoCacheDexArchiveBuilderTransform.transformconvertToDexArchivelaunchProcessingprocessJarInputconvertJarToDexArchivecopyToOutPut備份緩存文件只針對jar緩存END對于AGP為什么選擇只選擇緩存jar，從AGP中DexArchiveBuilderCacheHandler部分注釋可以找到答案，注釋如下
// Don't cache libraries depending on class files in folders:// Folders content is expected to change often so probably not worth paying the cache cost// if we frequently need to rebuild anyway.// Supporting dependency to class files would also require special care to respect order.大意認為class文件通常是經常發生變化的，緩存沒有多大意義；而jar則被認為是穩定的所以做了緩存處理，緩存相關類參見DexArchiveBuilderCacheHandler，有興趣大家自己瞅瞅
Task25 transformClassesWithMultidexlistForDebug
1. input/ouput
預備操作，build.gradle中添加
defaultConfig {multiDexEnabled truemultiDexKeepFile file('maindexlist.txt')}先在maindexlist.txt中添加MainActivity路徑讓其進入主dex
askName:transformClassesWithMultidexlistForDebug input:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/legacy_multidex_aapt_derived_proguard_rules/debug/processDebugResources/manifest_keep.txt input:/Users/apple/work/project/AndroidGradleTaskDemo/app/maindexlist.txt 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/multidex-1.0.2.aar/36d8b7d496f603cd6f98051792b0414c/jars/classes.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/work/project/AndroidGradleTaskDemo/app/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes/android/support/coreutils/R.class ... ========================================================= output:/Users/apple/work/project/AndroidGradleTaskDemo/app/build/intermediates/legacy_multidex_main_dex_list/debug/transformClassesWithMultidexlistForDebug/mainDexList.txt其實該任務就是我們通常說的Android分包機制
從控制臺可以看出該任務接受manifest_keep.txt、gradle中配置的multiDexKeepFile屬性以及APP依賴的jar,class文件最終進行處理生成mainDexList.txt該文件就是主dex中需要包含的類的集合,流程圖如下
2. 核心類(D8MainDexListTransform)
/*** Calculate the main dex list using D8.*/ class D8MainDexListTransform(private val manifestProguardRules: BuildableArtifact,private val userProguardRules: Path? = null,private val userClasses: Path? = null,private val includeDynamicFeatures: Boolean = false,private val bootClasspath: Supplier<List<Path>>) : Transform(), MainDexListWriter {private val logger = LoggerWrapper.getLogger(D8MainDexListTransform::class.java)private lateinit var outputMainDexList: Path@JvmOverloadsconstructor(variantScope: VariantScope, includeDynamicFeatures: Boolean = false) :this(variantScope.artifacts.getFinalArtifactFiles(InternalArtifactType.LEGACY_MULTIDEX_AAPT_DERIVED_PROGUARD_RULES),variantScope.variantConfiguration.multiDexKeepProguard?.toPath(),variantScope.variantConfiguration.multiDexKeepFile?.toPath(),includeDynamicFeatures,Supplier {variantScope.globalScope.androidBuilder.getBootClasspath(true).map { it.toPath() }})...override fun transform(invocation: TransformInvocation) {logger.verbose("Generating the main dex list using D8.")try {val inputs = MainDexListTransform.getByInputType(invocation)val programFiles = inputs[INPUT_JAR]!!.map { it.toPath() }val libraryFiles = inputs[LIBRARY_JAR]!!.map { it.toPath() } + bootClasspath.get()logger.verbose("Program files: %s", programFiles.joinToString())logger.verbose("Library files: %s", libraryFiles.joinToString())logger.verbose("Proguard rule files: %s",listOfNotNull(manifestProguardRules, userProguardRules).joinToString())// 1.讀取混淆規則文件val proguardRules =listOfNotNull(manifestProguardRules.singleFile().toPath(), userProguardRules)// 2.構建主dex集合 val mainDexClasses = mutableSetOf<String>()// 3. 獲取系統平臺的keep配置文件(參見👇方法)val keepRules = MainDexListTransform.getPlatformRules().map { it -> "-keep " + it }mainDexClasses.addAll(//4. 關鍵代碼：新版本AGP使用D8MainDexList輔助類生成主dex所包含的所有class路徑配置D8MainDexList.generate(keepRules,proguardRules,programFiles,libraryFiles))// 5.追加用戶配置的主dex配置文件，也就是build.gradle中配置的multiDexKeepFile屬性對應的文件if (userClasses != null) {mainDexClasses.addAll(Files.readAllLines(userClasses))}// 6. 清理舊數據Files.deleteIfExists(outputMainDexList)// 7. 生成mainDexList.txt路徑為app/build/intermediates/legacy_multidex_main_dex_list/debug/transformClassesWithMultidexlistForDebugFiles.write(outputMainDexList, mainDexClasses)} catch (e: D8MainDexList.MainDexListException) {throw TransformException("Error while generating the main dex list.", e)}} }//MainDexListTransform.java @NonNull static List<String> getPlatformRules() {return ImmutableList.of("public class * extends android.app.Instrumentation {\n"+ " <init>(); \n"+ " void onCreate(...);\n"+ " android.app.Application newApplication(...);\n"+ " void callApplicationOnCreate(android.app.Application);\n"+ " Z onException(java.lang.Object, java.lang.Throwable);\n"+ "}","public class * extends android.app.Application { "+ " <init>();\n"+ " void attachBaseContext(android.content.Context);\n"+ "}","public class * extends android.app.backup.BackupAgent { <init>(); }","public class * implements java.lang.annotation.Annotation { *;}","public class * extends android.test.InstrumentationTestCase { <init>(); }");}整體來看這個任務大體流程還是非常簡單的，重點是D8MainDexList類是如何怎么知道主dex需要配置那些class？
我們可以大膽猜測下：應為app啟動入口是MultiDexApplication要保證app能正常啟動至少要保證MultiDexApplication能正常創建成功；所以至少需要掃描該類所有關聯的類(從成員變量到方法)以及涉及到注解；我們帶這這思路進去D8MainDexList看下,最終調用了GenerateMainDexList類
可以看到run方法中其實就是對MainDexListBuilder.baseClasses集合進行掃描，找出DexClass中直接依賴的注解，Field以及每個方法的直接應用類，運行時注解；最終生成mainDex依賴類，有興趣的同學可以直接看源碼深入研究
Task26 transformDexArchiveWithDexMergerForDebug
1. input/ouput
taskName:transformDexArchiveWithDexMergerForDebug input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/legacy_multidex_main_dex_list/debug/transformClassesWithMultidexlistForDebug/mainDexList.txt input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/8.jar input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/9.jar input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/12.jar input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/13.jar input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/11.jar input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/10.jar input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/14.jar input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/15.jar input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/19/android/support/coreutils/R.dex input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/19/android/support/coreutils/R$drawable.dex input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/19/android/support/coreutils/R$attr.dex input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexBuilder/debug/19/android/support/coreutils/R$style.dex ... ========================================================= output:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/dexMerger/debug從輸入輸出可以知道該任務就是將任務24的產物jar和dex文件進行合并生成最終的dex，
補充下涉及到transform中的任務名生成規則如下:
很明顯任務前綴統一以transfrom開頭，并且將對應的transform子類的name和inputType名稱搭配生成
2. 核心類(DexMergerTransform)
public class DexMergerTransform extends Transform {@Overridepublic void transform(@NonNull TransformInvocation transformInvocation)throws TransformException, IOException, InterruptedException {TransformOutputProvider outputProvider = transformInvocation.getOutputProvider();Preconditions.checkNotNull(outputProvider, "Missing output object for transform " + getName());ProcessOutputHandler outputHandler =new ParsingProcessOutputHandler(new ToolOutputParser(new DexParser(), Message.Kind.ERROR, logger),new ToolOutputParser(new DexParser(), logger),messageReceiver);if (!transformInvocation.isIncremental()) {outputProvider.deleteAll();}ProcessOutput output = null;List<ForkJoinTask<Void>> mergeTasks;try (Closeable ignored = output = outputHandler.createOutput()) {// 1.此處dexinigType取決于VariantScopeImpl.getDexingType方法，// 因為不是instanrun模式且minsdk小于21所以此處類型為DexingType.LEGACY_MULTIDEXif (dexingType == DexingType.NATIVE_MULTIDEX && isDebuggable) {mergeTasks =handleNativeMultiDexDebug(transformInvocation.getInputs(),output,outputProvider,transformInvocation.isIncremental());} else {// 2.執行dex合并操作mergeTasks = mergeDex(transformInvocation.getInputs(), output, outputProvider);}// now wait for all merge tasks completionmergeTasks.forEach(ForkJoinTask::join);} catch (Exception e) {PluginCrashReporter.maybeReportException(e);// Print the error always, even without --stacktracelogger.error(null, Throwables.getStackTraceAsString(e));throw new TransformException(e);} finally {if (output != null) {try {outputHandler.handleOutput(output);} catch (ProcessException e) {// ignore this one}}}}/*** For legacy and mono-dex we always merge all dex archives, non-incrementally. For release* native multidex we do the same, to get the smallest possible dex files.*/@NonNullprivate List<ForkJoinTask<Void>> mergeDex(@NonNull Collection<TransformInput> inputs,@NonNull ProcessOutput output,@NonNull TransformOutputProvider outputProvider)throws IOException {ImmutableList.Builder<Path> dexArchiveBuilder = ImmutableList.builder();// 1. 將目錄中所有dex(每個dex都是一個class通過d8編譯生成的)追加到dexArchiveBuilder中TransformInputUtil.getDirectories(inputs).stream().map(File::toPath).forEach(dexArchiveBuilder::add);// 2. 追加所有jar(該jar中包含可能多個dex文件)路徑inputs.stream().flatMap(transformInput -> transformInput.getJarInputs().stream()).filter(jarInput -> jarInput.getStatus() != Status.REMOVED).map(jarInput -> jarInput.getFile().toPath()).forEach(dexArchiveBuilder::add);ImmutableList<Path> dexesToMerge = dexArchiveBuilder.build();if (dexesToMerge.isEmpty()) {return ImmutableList.of();}// 3. 指定合并后dex保存目錄File outputDir = getDexOutputLocation(outputProvider, "main", getScopes());// 4. 清理舊文件// this deletes and creates the dir for the outputFileUtils.cleanOutputDir(outputDir);Path mainDexClasses;if (mainDexListFile == null) {mainDexClasses = null;} else {// 5. 讀取主dex配置文件路徑mainDexClasses = BuildableArtifactUtil.singleFile(mainDexListFile).toPath();}// 6. 執行合并return ImmutableList.of(submitForMerging(output, outputDir, dexesToMerge, mainDexClasses));} }submitForMerging經過一系列如下調用
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.statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-p2lzPeey2Gg2GAsv .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-p2lzPeey2Gg2GAsv .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-p2lzPeey2Gg2GAsv .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-p2lzPeey2Gg2GAsv .note-edge{stroke-dasharray:5}#mermaid-svg-p2lzPeey2Gg2GAsv .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-p2lzPeey2Gg2GAsv .error-icon{fill:#522}#mermaid-svg-p2lzPeey2Gg2GAsv .error-text{fill:#522;stroke:#522}#mermaid-svg-p2lzPeey2Gg2GAsv .edge-thickness-normal{stroke-width:2px}#mermaid-svg-p2lzPeey2Gg2GAsv .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-p2lzPeey2Gg2GAsv .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-p2lzPeey2Gg2GAsv .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-p2lzPeey2Gg2GAsv .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-p2lzPeey2Gg2GAsv .marker{fill:#333}#mermaid-svg-p2lzPeey2Gg2GAsv .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-p2lzPeey2Gg2GAsv {color: rgba(0, 0, 0, 0.75);font: ;}submitForMergingDexMergerTransformCallable.callD8DexArchiveMerger.mergeDexArchives最終D8DexArchiveMerger.mergeDexArchives來接管merge任務
// D8DexArchiveMerger.java @Override public void mergeDexArchives(@NonNull Iterable<Path> inputs,@NonNull Path outputDir,@Nullable Path mainDexClasses,@NonNull DexingType dexingType)throws DexArchiveMergerException {LOGGER.log(Level.INFO,"Merging to '"+ outputDir.toAbsolutePath().toString()+ "' with D8 from "+ Streams.stream(inputs).map(path -> path.toAbsolutePath().toString()).collect(Collectors.joining(", ")));if (Iterables.isEmpty(inputs)) {return;}D8DiagnosticsHandler d8DiagnosticsHandler = new InterceptingDiagnosticsHandler();D8Command.Builder builder = D8Command.builder(d8DiagnosticsHandler);builder.setDisableDesugaring(true);for (Path input : inputs) {// 1. 對每個input對象轉化為DexArchive，可以理解為dex的集合// 如果是jar就是NonIncrementalJarDexArchive對象，dir就是DirDexArchivetry (DexArchive archive = DexArchives.fromInput(input)) {for (DexArchiveEntry dexArchiveEntry : archive.getFiles()) {// 2. 讀取并存儲dex以及原始路徑builder.addDexProgramData(dexArchiveEntry.getDexFileContent(),D8DiagnosticsHandler.getOrigin(dexArchiveEntry));}} catch (IOException e) {throw getExceptionToRethrow(e, input, d8DiagnosticsHandler);}}try {// 3. 主dex配置文件if (mainDexClasses != null) {builder.addMainDexListFiles(mainDexClasses);}builder.setMinApiLevel(minSdkVersion).setMode(compilationMode).setOutput(outputDir, OutputMode.DexIndexed).setDisableDesugaring(true).setIntermediate(false);// 4. 交給D8編譯器處理D8.run(builder.build(), forkJoinPool);} catch (CompilationFailedException e) {throw getExceptionToRethrow(e, inputs, d8DiagnosticsHandler);} }可以看到mergeDexArchives方法非常簡單就是對輸入數據進行判斷如果是jar則讀取jar中dex，如果dir則遍歷dir下所有dex；最后將這些交給D8編譯器編譯生成dex;關于生成dex命名規則參見ForwardingConsumer
public static class ForwardingConsumer implements DexIndexedConsumer {protected static String getDefaultDexFileName(int fileIndex) {return fileIndex == 0 ? "classes.dex" : "classes" + (fileIndex + 1) + ".dex";}protected String getDexFileName(int fileIndex) {return getDefaultDexFileName(fileIndex);} }Task 27 mergeDebugJniLibFolders
1. input/output
taskName:mergeDebugJniLibFolders input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/src/debug/jniLibs input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/src/main/jniLibs ========================================================= output:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/incremental/mergeDebugJniLibFolders output:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/jniLibs/debug合并app中jniLibs目錄下庫文件
2. 核心類(MergeJniLibFoldersConfigAction, MergeSourceSetFolders)
任務和task21類似，此處不在贅述
Task28 transformNativeLibsWithMergeJniLibsForDebug
1. input/output
input:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/libs/java-json.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/adapters-3.2.0.aar/bc960c7c2fdbe5a1b97481ebd16e7d07/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/library-3.2.0.aar/de8b548685f788612cb022c06f944e21/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/modules-2/files-2.1/com.android.databinding/baseLibrary/3.2.0/fb5f8492c36231104cd86feaefa723291504c0a6/baseLibrary-3.2.0.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/multidex-1.0.2.aar/bf674b553893d1ca7ec3045705c93ed8/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/appcompat-v7-26.1.0.aar/3835acebdd7fa231db259f7088788607/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/constraint-layout-1.1.3.aar/dafb9764e639c30db91be97006e47787/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/support-v4-26.1.0.aar/e50a7ebe45a7183db73f76387f58eadf/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/support-fragment-26.1.0.aar/68eceb6dacbf0dc308d62e2a91559369/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/support-core-utils-26.1.0.aar/137dca77f851b0e904bb098c1da042aa/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/animated-vector-drawable-26.1.0.aar/c49cb8624209768bd4984b8fead22f48/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/support-vector-drawable-26.1.0.aar/4a854f4c19aeb19de51777bbccdc7f48/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/support-media-compat-26.1.0.aar/6c38555fbd7f9d3e1a9de701d85ad85e/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/support-core-ui-26.1.0.aar/445504c8690be77ae0900482a270f4e9/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/support-compat-26.1.0.aar/160cc69dee260ec7a028fa1574fd87ba/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/transforms-1/files-1.1/runtime-1.0.3.aar/b7c442e59ee627256a254a2a31de63ac/jars/classes.jar input:/Users/dingbaosheng/.gradle/caches/modules-2/files-2.1/android.arch.lifecycle/common/1.0.3/7d7f60c4783872861222166f6164215f8951c7b1/common-1.0.3.jar input:/Users/dingbaosheng/.gradle/caches/modules-2/files-2.1/android.arch.core/common/1.0.0/a2d487452376193fc8c103dd2b9bd5f2b1b44563/common-1.0.0.jar input:/Users/dingbaosheng/.gradle/caches/modules-2/files-2.1/com.android.support/support-annotations/26.1.0/814258103cf26a15fcc26ecce35f5b7d24b73f8/support-annotations-26.1.0.jar input:/Users/dingbaosheng/.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 ========================================================= output:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/incremental/debug-mergeJniLibs/zip-cache output:/Users/dingbaosheng/work/mockuai/project/AndroidGradleTaskDemo/app/build/intermediates/transforms/mergeJniLibs/debug該任務主要用來合并app中所有so庫文件
2. 核心類(MergeJavaResourcesTransform)
/*** Transform to merge all the Java resources.** Based on the value of {@link #getInputTypes()} this will either process native libraries* or java resources. While native libraries inside jars are technically java resources, they* must be handled separately.*/ public class MergeJavaResourcesTransform extends Transform {private static final Pattern JAR_ABI_PATTERN = Pattern.compile("lib/([^/]+)/[^/]+");private static final Pattern ABI_FILENAME_PATTERN = Pattern.compile(".*\\.so");...public MergeJavaResourcesTransform(@NonNull PackagingOptions packagingOptions,@NonNull Set<? super Scope> mergeScopes,@NonNull ContentType mergedType,@NonNull String name,@NonNull VariantScope variantScope) {this.packagingOptions = packagingOptions;this.name = name;this.mergeScopes = ImmutableSet.copyOf(mergeScopes);this.mergedType = ImmutableSet.of(mergedType);this.intermediateDir = variantScope.getIncrementalDir(variantScope.getFullVariantName() + "-" + name);cacheDir = new File(intermediateDir, "zip-cache");// 該類主要處理資源合并的；合并類型此處分為2中，一種資源合并(非.class和非so文件以外文件)// transformResourcesWithMergeJavaResForDebug任務會走該caseif (mergedType == QualifiedContent.DefaultContentType.RESOURCES) {acceptedPathsPredicate =path -> !path.endsWith(SdkConstants.DOT_CLASS)&& !path.endsWith(SdkConstants.DOT_NATIVE_LIBS);} else if (mergedType == ExtendedContentType.NATIVE_LIBS) {// so庫文件資源合并acceptedPathsPredicate =path -> {Matcher m = JAR_ABI_PATTERN.matcher(path);// if the ABI is accepted, check the 3rd segmentif (m.matches()) {// remove the beginning of the path (lib/<abi>/)String filename = path.substring(5 + m.group(1).length());// and check the filenamereturn ABI_FILENAME_PATTERN.matcher(filename).matches() ||SdkConstants.FN_GDBSERVER.equals(filename) ||SdkConstants.FN_GDB_SETUP.equals(filename);}return false;};} else {throw new UnsupportedOperationException("mergedType param must be RESOURCES or NATIVE_LIBS");}} }從類注釋說明可以看到該類主要是合并資源(分native資源(.so庫)和java資源)所以transformResourcesWithMergeJavaResForDebug任務也是走該類邏輯方法，只是對應的inputType有差異性
3. transform
@Override public void transform(@NonNull TransformInvocation invocation)throws IOException, TransformException {FileUtils.mkdirs(cacheDir);FileCacheByPath zipCache = new FileCacheByPath(cacheDir);TransformOutputProvider outputProvider = invocation.getOutputProvider();checkNotNull(outputProvider, "Missing output object for transform " + getName());ParsedPackagingOptions packagingOptions = new ParsedPackagingOptions(this.packagingOptions);boolean full = false;// 1. 加載增量緩存狀態IncrementalFileMergerState state = loadMergeState();// 2. 如果是全量構建，直接情況舊文件if (state == null || !invocation.isIncremental()) {/** This is a full build.*/state = new IncrementalFileMergerState();outputProvider.deleteAll();full = true;}List<Runnable> cacheUpdates = new ArrayList<>();Map<IncrementalFileMergerInput, QualifiedContent> contentMap = new HashMap<>();List<IncrementalFileMergerInput> inputs =new ArrayList<>(IncrementalFileMergerTransformUtils.toInput(invocation,zipCache,cacheUpdates,full,contentMap));/** In an ideal world, we could just send the inputs to the file merger. However, in the* real world we live in, things are more complicated :)** We need to:** 1. We need to bring inputs that refer to the project scope before the other inputs.* 2. Prefix libraries that come from directories with "lib/".* 3. Filter all inputs to remove anything not accepted by acceptedPathsPredicate neither* by packagingOptions.*/// 3. inputs的排序// Sort inputs to move project scopes to the start.inputs.sort((i0, i1) -> {int v0 = contentMap.get(i0).getScopes().contains(Scope.PROJECT)? 0 : 1;int v1 = contentMap.get(i1).getScopes().contains(Scope.PROJECT)? 0 : 1;return v0 - v1;});// Prefix libraries with "lib/" if we're doing libraries.assert mergedType.size() == 1;ContentType mergedType = this.mergedType.iterator().next();if (mergedType == ExtendedContentType.NATIVE_LIBS) {inputs =inputs.stream().map(i -> {QualifiedContent qc = contentMap.get(i);if (qc.getFile().isDirectory()) {i =new RenameIncrementalFileMergerInput(i,s -> "lib/" + s,s -> s.substring("lib/".length()));contentMap.put(i, qc);}return i;}).collect(Collectors.toList());}// 過濾// Filter inputs.Predicate<String> inputFilter =acceptedPathsPredicate.and(path -> packagingOptions.getAction(path) != PackagingFileAction.EXCLUDE);inputs = inputs.stream().map(i -> {IncrementalFileMergerInput i2 =new FilterIncrementalFileMergerInput(i, inputFilter);contentMap.put(i2, contentMap.get(i));return i2;}).collect(Collectors.toList());.../** Create an output that uses the algorithm. This is not the final output because,* unfortunately, we still have the complexity of the project scope overriding other scopes* to solve.** When resources inside a jar file are extracted to a directory, the results may not be* expected on Windows if the file names end with "." (bug 65337573), or if there is an* uppercase/lowercase conflict. To work around this issue, we copy these resources to a* jar file.*/// 根據合并類型創建不同baseOutputIncrementalFileMergerOutput baseOutput;if (mergedType == QualifiedContent.DefaultContentType.RESOURCES) {File outputLocation =outputProvider.getContentLocation("resources", getOutputTypes(), getScopes(), Format.JAR);baseOutput =IncrementalFileMergerOutputs.fromAlgorithmAndWriter(mergeTransformAlgorithm, MergeOutputWriters.toZip(outputLocation));} else {File outputLocation =outputProvider.getContentLocation("resources", getOutputTypes(), getScopes(), Format.DIRECTORY);baseOutput =IncrementalFileMergerOutputs.fromAlgorithmAndWriter(mergeTransformAlgorithm,MergeOutputWriters.toDirectory(outputLocation));}...// 合并操作state = IncrementalFileMerger.merge(ImmutableList.copyOf(inputs), output, state);// 持久化操作saveMergeState(state);cacheUpdates.forEach(Runnable::run); }👇
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