AndroidPlugin源码解析-(六)

// must clear the folder in case the packagename changed, otherwise,
// there'll be two classes.
File destinationDir = getSourceOutputDir();
FileUtils.cleanOutputDir(destinationDir);
BuildConfigGenerator generator = new BuildConfigGenerator(
       getSourceOutputDir(),
       getBuildConfigPackageName());
// Hack (see IDEA-100046): We want to avoid reporting "condition is always true"
// from the data flow inspection, so use a non-constant value. However, that defeats
// the purpose of this flag (when not in debug mode, if (BuildConfig.DEBUG && ...) will
// be completely removed by the compiler), so as a hack we do it only for the case
// where debug is true, which is the most likely scenario while the user is looking
// at source code.
//map.put(PH_DEBUG, Boolean.toString(mDebug));
generator.addField("boolean", "DEBUG",
       isDebuggable() ? "Boolean.parseBoolean(\"true\")" : "false")
       .addField("String", "APPLICATION_ID", '"' + getAppPackageName() + '"')
       .addField("String", "BUILD_TYPE", '"' + getBuildTypeName() + '"')
       .addField("String", "FLAVOR", '"' + getFlavorName() + '"')
       .addField("int", "VERSION_CODE", Integer.toString(getVersionCode()))
       .addField("String", "VERSION_NAME", '"' + Strings.nullToEmpty(getVersionName()) + '"')
       .addItems(getItems());
List<String> flavors = getFlavorNamesWithDimensionNames();
int count = flavors.size();
if (count > 1) {
   for (int i = 0; i < count; i += 2) {
       generator.addField(
               "String", "FLAVOR_" + flavors.get(i + 1), '"' + flavors.get(i) + '"');
   }
}
generator.generate();

// we have to clean the source folder output in case the package name changed.
File srcOut = getSourceOutputDir();
if (srcOut != null) {
    FileUtils.cleanOutputDir(srcOut);
}
@Nullable
// 对于application来说，这个文件是`build/intermediates/res/resources-${buildType}.ap_
// 对于library来说，为null
// 这个是aapt执行完成后输出的压缩文件，里面包含了所有资源文件，和最终的`resources.arsc`
File resOutBaseNameFile = getPackageOutputFile();
File manifestFileToPackage = getManifestFile();
AndroidBuilder builder = getBuilder();
MergingLog mergingLog = new MergingLog(getMergeBlameLogFolder());
ProcessOutputHandler processOutputHandler = new ParsingProcessOutputHandler(
        new ToolOutputParser(new AaptOutputParser(), getILogger()), // 处理执行完的log
        new MergingLogRewriter(mergingLog, builder.getErrorReporter()));
        // merge后的log位于
        // build/intermediates/blame/res/${buildConfig}/
// 生成对应的Aapt对象
Aapt aapt = AaptGradleFactory.make(
        getBuilder(),
        processOutputHandler,
        true,
        true,
        variantScope.getGlobalScope().getProject(),
        variantScope.getVariantConfiguration().getType(),
        FileUtils.mkdirs(new File(getIncrementalFolder(), "aapt-temp")),
        aaptOptions.getCruncherProcesses());
// 给Aapt设置参数
AaptPackageConfig.Builder config = new AaptPackageConfig.Builder()
        .setManifestFile(manifestFileToPackage)
        .setOptions(getAaptOptions())
        .setResourceDir(getResDir())
        .setLibraries(getLibraries())
        .setCustomPackageForR(getPackageForR())
        .setSymbolOutputDir(getTextSymbolOutputDir())
        .setSourceOutputDir(srcOut)
        .setResourceOutputApk(resOutBaseNameFile)
        .setProguardOutputFile(getProguardOutputFile())
        .setMainDexListProguardOutputFile(getMainDexListProguardOutputFile())
        .setVariantType(getType())
        .setDebuggable(getDebuggable())
        .setPseudoLocalize(getPseudoLocalesEnabled())
        .setResourceConfigs(getResourceConfigs())
        .setSplits(getSplits())
        .setPreferredDensity(getPreferredDensity());
builder.processResources(aapt, config, getEnforceUniquePackageName());
if (resOutBaseNameFile != null && LOG.isInfoEnabled()) {
    LOG.info("Aapt output file {}", resOutBaseNameFile.getAbsolutePath());
}

AaptPackageConfig aaptConfig = aaptConfigBuilder.build();
try {
    aapt.link(aaptConfig).get();
} catch (Exception e) {
    throw new ProcessException("Failed to execute aapt", e);
}

public ListenableFuture<Void> link(@NonNull AaptPackageConfig config)
        throws AaptException {
    validatePackageConfig(config); // 做一些校验
    return makeValidatedPackage(config);
}

public void createProcessJavaResTasks(
        @NonNull TaskFactory tasks,
        @NonNull VariantScope variantScope) {
    TransformManager transformManager = variantScope.getTransformManager();
    // now copy the source folders java resources into the temporary location, mainly to
    // maintain the PluginDsl COPY semantics.
    AndroidTask<Sync> processJavaResourcesTask =
            androidTasks.create(tasks, new ProcessJavaResConfigAction(variantScope));
    variantScope.setProcessJavaResourcesTask(processJavaResourcesTask);
    // create the stream generated from this task
    variantScope.getTransformManager().addStream(OriginalStream.builder()
            .addContentType(DefaultContentType.RESOURCES)
            .addScope(Scope.PROJECT)
            .setFolder(variantScope.getSourceFoldersJavaResDestinationDir())
            .setDependency(processJavaResourcesTask.getName())
            .build());
    // compute the scopes that need to be merged.
    Set<Scope> mergeScopes = getResMergingScopes(variantScope);
    // Create the merge transform
    MergeJavaResourcesTransform mergeTransform = new MergeJavaResourcesTransform(
            variantScope.getGlobalScope().getExtension().getPackagingOptions(),
            mergeScopes, DefaultContentType.RESOURCES, "mergeJavaRes");
    variantScope.setMergeJavaResourcesTask(
            transformManager.addTransform(tasks, variantScope, mergeTransform));
}