一种按照library的维度进行Android包大小分析的方法和实践

def extension_merge_state = project.extensions.getByName("android")
extension_merge_state.applicationVariants.all { variant ->
    def variant_name = variant.name

    //1、res资源合并的映射文件：app/build/intermediates/incremental/mergeDebugResources/merger.xml
    def mergeResourcesTask = variant.getMergeResources()
    mergeResourcesTask.doLast{
        def mergeResFile = mergeResourcesTask.incrementalFolder.absolutePath + "/merger.xml"
        println(mergeResFile)
        appendFilePath("mergeResources.xml",mergeResFile)
    }

    //2、assert资源合并映射表：app/build/intermediates/incremental/mergeDebugAssets/merger.xml
    def mergeAssetsTask = variant.getMergeAssets()
    mergeAssetsTask.doLast{
        def assertMergerFile = mergeAssetsTask.incrementalFolder.absolutePath + "/merger.xml"
        println(assertMergerFile)
        appendFilePath("mergeAssets.xml", assertMergerFile)
    }

    //3、so文件合并映射表，通过序列化IncrementalFileMergerState实现：app/build/intermediates/incremental/a_plusDebug-mergeNativeLibs/merge-state
    def container = variant.variantData.taskManager.taskFactory.taskContainer
    Task mergeNativeLibsTask = container.getByName("merge${variant_name.capitalize()}NativeLibs")
    mergeNativeLibsTask.doLast {
        def cache_merge_state = mergeNativeLibsTask.cacheDir.getParent() + "/merge-state"
        println(cache_merge_state)
        appendFilePath("mergeNativeLibs_merge_state",cache_merge_state)
    }

    //4、java资源合并映射表，通过序列化IncrementalFileMergerState实现 app/build/intermediates/incremental/debug-mergeJavaRes/merge-state
    Task mergeJavaResourceTask = container.getByName("merge${variant_name.capitalize()}JavaResource")
    mergeJavaResourceTask.doLast {
        def cache_merge_state = mergeJavaResourceTask.cacheDir.getParent() + "/merge-state"
        println(cache_merge_state)
        appendFilePath("mergeJavaRes_merge_state", cache_merge_state)
    }
}

def void appendFilePath(file_key, file_path){
    String input_dir = project.buildDir.toPath().toString() + "/merge_state"
    File dir = new File(input_dir)
    if(!dir.exists()){
        dir.mkdir()
    }
    def inputFile = new File(dir.absolutePath,"merge_files.txt")
    if(!inputFile.exists()){
        inputFile.createNewFile()
    }
    inputFile.append("${file_key}:${file_path}\n")
}

public class MergeStateParser {

  public static void main(String[] args) {
    parseObject(args[0],args[1]);
  }
  public static void parseObject(String mergeStatePath, String outputJsonPath){
    ObjectInputStream ois = null;
    try {
      ois = new ObjectInputStream(new FileInputStream(mergeStatePath));
      IncrementalFileMergerState merge_state = (IncrementalFileMergerState) ois.readObject();
      System.out.println(merge_state);
      String json = new Gson().toJson(merge_state);
      FileWriter fw = null;
      try {
        fw = new FileWriter(outputJsonPath);
        fw.write(json);
        fw.flush();
        fw.close();
      } catch (IOException e) {
        e.printStackTrace();
      }

    }catch (Exception ex){
      System.out.println(ex.getMessage());
    } finally {
      try {
        if (ois != null){
          ois.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
}

implementation "com.google.guava:guava:27.0.1-jre"

<merge>
<dataSet config="com.huawei.hms:network-common:4.0.2.300$Generated">
<source path="~/.gradle/caches/transforms-2/files-2.1/2f0a9e8fc70c40e9075d15cdfac8d50c/network-common-4.0.2.300/res">
<file path="~/.gradle/caches/transforms-2/files-2.1/2f0a9e8fc70c40e9075d15cdfac8d50c/network-common-4.0.2.300/res/values/values.xml" qualifiers="">
</file>

 <file>
  ...
</file>

</source>
</dataSet>
</merge>

/**
 * Names of all inputs to merge, in order.
 */
private final ImmutableList<String> inputNames;

/**
 * Maps OS-independent paths to the names of the input sets that were used to construct the
 * merged output.
 */
private final ImmutableMap<String, ImmutableList<String>> origin;

private final ImmutableMap<String, ImmutableSet<String>> byInput;

~/gradle/gradle-4.1/caches/transforms-2/files-2.1/cd6b3a2f4da4a2ecf7cedbc4998ac5b2/jetified-lib_castscreen-1.1.1/jars/classes.jar

~/gradle/gradle-4.1/caches/modules-2/files-2.1/com.ke.crashly/collector/1.6.5/9176c716a002a64fe90bc9787272228b362a5d4a/collector-1.6.5.jar