标签：des android style blog http io ar color os
上一篇讲到ApkDecoder这个类，大部分调用到还是Androlib类，而且上次发现brutall的代码竟然不是最新的，遂去找iBotP.的代码了。
今天来看Androlib的代码：
private final AndrolibResources mAndRes = new AndrolibResources(); protected final ResUnknownFiles mResUnknownFiles = new ResUnknownFiles(); public ApkOptions apkOptions;
/**两个构造方法*/ public Androlib(ApkOptions apkOptions) { this.apkOptions = apkOptions; mAndRes.apkOptions = apkOptions; } public Androlib() {//默认ApkOption this.apkOptions = new ApkOptions(); mAndRes.apkOptions = this.apkOptions; } public ResTable getResTable(ExtFile apkFile) throws AndrolibException { return mAndRes.getResTable(apkFile, true);//终究还是去AndrolibRecources类里，所以下篇预告就是它了 } public ResTable getResTable(ExtFile apkFile, boolean loadMainPkg) throws AndrolibException { return mAndRes.getResTable(apkFile, loadMainPkg); }
Androlib主要分为两类，一类是decodeXXX解码(反编译)方法，一类是buildXXX构建(回编译)方法。这里暂且不讲build方法，先看decode。
源文件的反编译有三个方法decodeSourceRow()、decodeSourceSmali()、decodeSourceJava()，decodeSourceRow()方法就直接把classes.dex文件拷贝的输出目录，decodeSourceSmali()方法是通过SmaliDecoder类去解码出smali文件，decodeSourceJava()方法就是调用AndrolibJava类解码java文件。
public void decodeSourcesRaw(ExtFile apkFile, File outDir, String filename) throws AndrolibException { try { LOGGER.info("Copying raw classes.dex file..."); apkFile.getDirectory().copyToDir(outDir, filename); } catch (DirectoryException ex) { throw new AndrolibException(ex); } } public void decodeSourcesSmali(File apkFile, File outDir, String filename, boolean debug, String debugLinePrefix, boolean bakdeb, int api) throws AndrolibException { try { File smaliDir; if (filename.equalsIgnoreCase("classes.dex")) { smaliDir = new File(outDir, SMALI_DIRNAME); } else { smaliDir = new File(outDir, SMALI_DIRNAME + "_" + filename.substring(0, filename.indexOf("."))); } OS.rmdir(smaliDir); smaliDir.mkdirs();//创建smali目录 LOGGER.info("Baksmaling " + filename + "..."); SmaliDecoder.decode(apkFile, smaliDir, filename, debug, debugLinePrefix, bakdeb, api);//解析出smali } catch (BrutException ex) { throw new AndrolibException(ex); } } public void decodeSourcesJava(ExtFile apkFile, File outDir, boolean debug) throws AndrolibException { LOGGER.info("Decoding Java sources..."); new AndrolibJava().decode(apkFile, outDir);//这个AndrolibJava().decode()方法不多，就一个输入文件和输出目录
}
XXXRow后缀的方法都是不解码直接拷贝，下面是对AndroidManifest.xml的反编译。
public void decodeManifestRaw(ExtFile apkFile, File outDir) throws AndrolibException { try { Directory apk = apkFile.getDirectory(); LOGGER.info("Copying raw manifest..."); apkFile.getDirectory().copyToDir(outDir, APK_MANIFEST_FILENAMES); } catch (DirectoryException ex) { throw new AndrolibException(ex); } } public void decodeManifestFull(ExtFile apkFile, File outDir, ResTable resTable) throws AndrolibException { mAndRes.decodeManifest(resTable, apkFile, outDir);//这里有一个ResTable参数 }
xml文件都是用AndrolibRecources去反编译的，下面看res的解码。
public void decodeResourcesRaw(ExtFile apkFile, File outDir) throws AndrolibException { try { LOGGER.info("Copying raw resources..."); apkFile.getDirectory().copyToDir(outDir, APK_RESOURCES_FILENAMES); } catch (DirectoryException ex) { throw new AndrolibException(ex); } } public void decodeResourcesFull(ExtFile apkFile, File outDir, ResTable resTable) throws AndrolibException { mAndRes.decode(resTable, apkFile, outDir);//这里发现AndrolibRecources的所有decode方法都要一个ResTable，资源表？ }
接下来是lib目录和assets目录的反编译，其实这里就是直接拷贝输出。
public void decodeRawFiles(ExtFile apkFile, File outDir) throws AndrolibException { LOGGER.info("Copying assets and libs..."); try { Directory in = apkFile.getDirectory(); if (in.containsDir("assets")) { in.copyToDir(outDir, "assets"); } if (in.containsDir("lib")) { in.copyToDir(outDir, "lib"); } if (in.containsDir("libs")) { in.copyToDir(outDir, "libs"); } } catch (DirectoryException ex) { throw new AndrolibException(ex); } }
还有一个decodeUnknownFiles()方法，就是非apk内常见的文件。这里先列一下哪些是apk标准文件名：
private final static String[] APK_STANDARD_ALL_FILENAMES = new String[] { "classes.dex", "AndroidManifest.xml", "resources.arsc", "res", "lib", "libs", "assets", "META-INF" };
其他的都不是apk支持的文件，处理方法就是直接拷贝输出。
private boolean isAPKFileNames(String file) {//判断apk包内文件是不是以上的常规文件 for (String apkFile : APK_STANDARD_ALL_FILENAMES) { if (apkFile.equals(file) || file.startsWith(apkFile + "/")) { return true; } } return false; } public void decodeUnknownFiles(ExtFile apkFile, File outDir, ResTable resTable) throws AndrolibException { LOGGER.info("Copying unknown files..."); File unknownOut = new File(outDir, UNK_DIRNAME); ZipEntry invZipFile; // have to use container of ZipFile to help identify compression type // with regular looping of apkFile for easy copy try { Directory unk = apkFile.getDirectory(); ZipExtFile apkZipFile = new ZipExtFile(apkFile.getAbsolutePath()); // loop all items in container recursively, ignoring any that are pre-defined by aapt Set<String> files = unk.getFiles(true); for (String file : files) {//取出apk内所有文件名 if (!isAPKFileNames(file) && !file.endsWith(".dex")) {//不是常规文件也不是.dex文件 // copy file out of archive into special "unknown" folder unk.copyToDir(unknownOut, file);//拷贝至unknown目录 try { // ignore encryption apkZipFile.getEntry(file).getGeneralPurposeBit().useEncryption(false); invZipFile = apkZipFile.getEntry(file); // lets record the name of the file, and its compression type // so that we may re-include it the same way if (invZipFile != null) {//这里把他们收集起来，如果需要回编译还可以原封不动的塞回去 mResUnknownFiles.addUnknownFileInfo(invZipFile.getName(), String.valueOf(invZipFile.getMethod())); } } catch (NullPointerException ignored) { } } } apkZipFile.close(); } catch (DirectoryException | IOException ex) { throw new AndrolibException(ex); } }
最后一个writeOriginalFiles()方法，相比大家用过apktool的都知道反编译的目录里有个original目录，就是存放原始文件的目录。
public void writeOriginalFiles(ExtFile apkFile, File outDir) throws AndrolibException { LOGGER.info("Copying original files..."); File originalDir = new File(outDir, "original");//创建original目录 if (!originalDir.exists()) { originalDir.mkdirs(); } try { Directory in = apkFile.getDirectory(); if(in.containsFile("AndroidManifest.xml")) { in.copyToDir(originalDir, "AndroidManifest.xml"); } if (in.containsDir("META-INF")) {//证书文件是在original目录 in.copyToDir(originalDir, "META-INF"); } } catch (DirectoryException ex) { throw new AndrolibException(ex); } }
不过还有一个创建apktool.yml描述文件的方法。
public void writeMetaFile(File mOutDir, Map<String, Object> meta)//键值对信息 throws AndrolibException { DumperOptions options = new DumperOptions(); options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK); Yaml yaml = new Yaml(options); try ( Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream( new File(mOutDir, "apktool.yml")), "UTF-8"));//输出目录 ) { yaml.dump(meta, writer); } catch (IOException ex) { throw new AndrolibException(ex); } }
好了，我们看一眼一个反编译实例的目录。
这下想必大家都了然于胸了，这里有几点要说的。签名证书是在original目录，另外original也有一份AndroidManifest.xml是没有解码的，打开是乱码的，最外层的那个才是解码后的。
还有unknown目录，可以打卡看一看可能会是其他库的rar文件，图片文件，数据文件之类的。最后看一眼apktool.tml:
version: 2.0.0-RC3
apkFileName: Baidu_Lebo_M01.apk
isFrameworkApk: false
usesFramework:
ids: - 1
sdkInfo:
minSdkVersion: ‘8‘
targetSdkVersion: ‘11‘
packageInfo:
forced-package-id: ‘127‘
versionInfo:
versionCode: ‘16‘
versionName: 2.0.1
compressionType: true
unknownFiles://前面都是meta键值对生成
com/baidu/music/lebo/logic/api/model/model.rar: ‘8‘
com/handmark/pulltorefresh/library/logo.png: ‘8‘
com/j256/ormlite/android/LICENSE.txt: ‘8‘
com/j256/ormlite/android/README.txt: ‘8‘
com/j256/ormlite/core/LICENSE.txt: ‘8‘
com/j256/ormlite/core/README.txt: ‘8‘
再回过头来看一下上篇讲到的ApkDecoder.decode()方法，思路就很清晰了。
1.首先创建输出目录
2.反编译资源文件，这里有几个判断，如果apk有recources.arsc文件就调用AndrolibRecources.decodeResourcesXXX()，如果没有资源文件有AndroidMenifest.xml文件，就直接调用AndrolibRecources.decodeManifestXXX()方法。由此可见，如果recources.arsc和AndroidMenifest.xml都有的话，应该都是在AndrolibRecources.decodeResources里解码的。
3.反编译源文件，这里也有两种情况，新版Android支持MultiDex(原来的有53566方法数限制)了也就意味着一个apk里可能不止classes.dex一个dex文件了，可能叫classes1.dex、classes2.dex(没去实践)。如果是有多个dex就循环调用decodeSourcesSmali、decodeSourcesJava、decodeSourcesRow这三个方法。
4.拷贝libs、assets目录文件和其他文件至输出目录。//mAndrolib.decodeRawFiles(mApkFile, outDir);mAndrolib.decodeUnknownFiles(mApkFile, outDir, mResTable);
5.输出原始文件original目录，这里只看对这两个文件的拷贝AndroidManifest.xml和META-INF目录。//mAndrolib.writeOriginalFiles(mApkFile, outDir);
ApkDecoder.decode()的代码就补贴了，上一篇应该贴过了，这里贴一下几个判断的代码，这样大家更容易明白。
public boolean hasSources() throws AndrolibException {//判断有没有源文件的依据就是看apk压缩包内有没有classes.dex文件 try { return mApkFile.getDirectory().containsFile("classes.dex"); } catch (DirectoryException ex) { throw new AndrolibException(ex); } } public boolean hasMultipleSources() throws AndrolibException {//看有没有多个.dex文件 try { Set<String> files = mApkFile.getDirectory().getFiles(true); for (String file : files) { if (file.endsWith(".dex")) { if (! file.equalsIgnoreCase("classes.dex")) { return true; } } } return false; } catch (DirectoryException ex) { throw new AndrolibException(ex); } } public boolean hasManifest() throws AndrolibException {//有没有AndroidManifest.xml文件，这个必须要有啊 try { return mApkFile.getDirectory().containsFile("AndroidManifest.xml"); } catch (DirectoryException ex) { throw new AndrolibException(ex); } } public boolean hasResources() throws AndrolibException {//判断有没有资源文件resources.arsc try { return mApkFile.getDirectory().containsFile("resources.arsc"); } catch (DirectoryException ex) { throw new AndrolibException(ex); } }
标签：des android style blog http io ar color os
原文地址：http://www.cnblogs.com/bvin/p/4158014.html
