Android 热修复 Tinker接入及源码浅析最精彩没有之一

接入Tinker

接入tinker目前给了两种方式，一种是基于命令行的方式，类似于AndFix的接入方式；一种就是gradle的方式。

考虑早期使用Andfix的app应该挺多的，以及很多人对gradle的相关配置还是觉得比较繁琐的，下面对两种方式都介绍下。

（1）命令行接入

接入之前我们先考虑下，接入的话，正常需要的前提（开启混淆的状态）。

对于API

一般来说，我们接入热修库，会在Application#onCreate中进行一下初始化操作。然后在某个地方去调用类似loadPatch这样的API去加载patch文件。
对于patch的生成

简单的方式就是通过两个apk做对比然后生成；需要注意的是：两个apk做对比，需要的前提条件，第二次打包混淆所使用的mapping文件应该和线上apk是一致的。

最后就是看看这个项目有没有需要配置混淆；

有了大致的概念，我们就基本了解命令行接入tinker，大致需要哪些步骤了。

依赖引入

dependencies {// ...//可选，用于生成application类provided('com.tencent.tinker:tinker-android-anno:1.7.7')//tinker的核心库compile('com.tencent.tinker:tinker-android-lib:1.7.7')
}

顺便加一下签名的配置：

android{//...signingConfigs {release {try {storeFile file("release.keystore")storePassword "testres"keyAlias "testres"keyPassword "testres"} catch (ex) {throw new InvalidUserDataException(ex.toString())}}}buildTypes {release {minifyEnabled truesigningConfig signingConfigs.releaseproguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'}debug {debuggable trueminifyEnabled truesigningConfig signingConfigs.releaseproguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'}}
}

文末会有demo的下载地址，可以直接参考build.gradle文件，不用担心这些签名文件去哪找。

API引入

API主要就是初始化和loadPacth。

正常情况下，我们会考虑在Application的onCreate中去初始化，不过tinker推荐下面的写法：

@DefaultLifeCycle(application = ".SimpleTinkerInApplication",flags = ShareConstants.TINKER_ENABLE_ALL,loadVerifyFlag = false)
public class SimpleTinkerInApplicationLike extends ApplicationLike {public SimpleTinkerInApplicationLike(Application application, int tinkerFlags, boolean tinkerLoadVerifyFlag, long applicationStartElapsedTime, long applicationStartMillisTime, Intent tinkerResultIntent) {super(application, tinkerFlags, tinkerLoadVerifyFlag, applicationStartElapsedTime, applicationStartMillisTime, tinkerResultIntent);}@Overridepublic void onBaseContextAttached(Context base) {super.onBaseContextAttached(base);}@Overridepublic void onCreate() {super.onCreate();TinkerInstaller.install(this);}
}

ApplicationLike通过名字你可能会猜，并非是Application的子类，而是一个类似Application的类。

tinker建议编写一个ApplicationLike的子类，你可以当成Application去使用，注意顶部的注解：@DefaultLifeCycle，其application属性，会在编译期生成一个SimpleTinkerInApplication类。

所以，虽然我们这么写了，但是实际上Application会在编译期生成，所以AndroidManifest.xml中是这样的：

 <applicationandroid:name=".SimpleTinkerInApplication".../>

编写如果报红，可以build下。

这样其实也能猜出来，这个注解背后有个Annotation Processor在做处理，如果你没了解过，可以看下：

Android 如何编写基于编译时注解的项目

通过该文会对一个编译时注解的运行流程和基本API有一定的掌握，文中也会对tinker该部分的源码做解析。

上述，就完成了tinker的初始化，那么调用loadPatch的时机，我们直接在Activity中添加一个Button设置：


public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}public void loadPatch(View view) {TinkerInstaller.onReceiveUpgradePatch(getApplicationContext(),Environment.getExternalStorageDirectory().getAbsolutePath() + "/patch_signed.apk");}
}

我们会将patch文件直接push到sdcard根目录；

所以一定要注意：添加SDCard权限，如果你是6.x以上的系统，自己添加上授权代码，或者手动在设置页面打开SDCard读写权限。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

除以以外，有个特殊的地方就是tinker需要在AndroidManifest.xml中指定TINKER_ID。

<application><meta-dataandroid:name="TINKER_ID"android:value="tinker_id_6235657" />//...
</application>

到此API相关的就结束了，剩下的就是考虑patch如何生成。

patch生成

tinker提供了patch生成的工具，源码见：tinker-patch-cli，打成一个jar就可以使用，并且提供了命令行相关的参数以及文件。

命令行如下：

java -jar tinker-patch-cli-1.7.7.jar -old old.apk -new new.apk -config tinker_config.xml -out output

需要注意的就是tinker_config.xml，里面包含tinker的配置，例如签名文件等。

这里我们直接使用tinker提供的签名文件，所以不需要做修改，不过里面有个Application的item修改为与本例一致：

<loader value="com.zhy.tinkersimplein.SimpleTinkerInApplication"/>

大致的文件结构如下：

可以在tinker-patch-cli中提取，或者直接下载文末的例子。

上述介绍了patch生成的命令，最后需要注意的就是，在第一次打出apk的时候，保留下生成的mapping文件，在/build/outputs/mapping/release/mapping.txt。

可以copy到与proguard-rules.pro同目录，同时在第二次打修复包的时候，在proguard-rules.pro中添加上：

-applymapping mapping.txt

保证后续的打包与线上包使用的是同一个mapping文件。

tinker本身的混淆相关配置，可以参考：

tinker_proguard.pro

如果，你对该部分描述不了解，可以直接查看源码即可。

测试

首先随便生成一个apk（API、混淆相关已经按照上述引入），安装到手机或者模拟器上。

然后，copy出mapping.txt文件，设置applymapping，修改代码，再次打包，生成new.apk。

两次的apk，可以通过命令行指令去生成patch文件。

如果你下载本例，命令需要在[该目录]下执行。

最终会在output文件夹中生成产物：

我们直接将patch_signed.apk push到sdcard，点击loadpatch，一定要观察命令行是否成功。

本例修改了title。

点击loadPatch，观察log，如果成功，应用默认为重启，然后再次启动即可达到修复效果。

到这里命令行的方式就介绍完了，和Andfix的接入的方式基本上是一样的。

值得注意的是:该例仅展示了基本的接入，对于tinker的各种配置信息，还是需要去读tinker的文档（如果你确定要使用）tinker-wiki。

（2）gradle接入

gradle接入的方式应该算是主流的方式，所以tinker也直接给出了例子，单独将该tinker-sample-android以project方式引入即可。

引入之后，可以查看其接入API的方式，以及相关配置。

在你每次build时，会在build/bakApk下生成本地打包的apk，R文件，以及mapping文件。

如果你需要生成patch文件，可以通过：

./gradlew tinkerPatchRelease  // 或者 ./gradlew tinkerPatchDebug

生成。

生成目录为:build/outputs/tinkerPatch

需要注意的是，需要在app/build.gradle中设置相比较的apk（即old.apk，本次为new.apk），

ext {tinkerEnabled = true//old apk file to build patch apktinkerOldApkPath = "${bakPath}/old.apk"//proguard mapping file to build patch apktinkerApplyMappingPath = "${bakPath}/old-mapping.txt"
}

提供的例子，基本上展示了tinker的自定义扩展的方式，具体还可以参考：

Tinker-自定义扩展

所以，如果你使用命令行方式接入，也不要忘了学习下其支持哪些扩展。

三、Application是如何编译时生成的

从注释和命名上看：

//可选，用于生成application类
provided('com.tencent.tinker:tinker-android-anno:1.7.7')

明显是该库，其结构如下：

典型的编译时注解的项目，源码见tinker-android-anno。

入口为com.tencent.tinker.anno.AnnotationProcessor，可以在该services/javax.annotation.processing.Processor文件中找到处理类全路径。

再次建议，如果你不了解，简单阅读下Android 如何编写基于编译时注解的项目该文。

直接看AnnotationProcessor的process方法：

@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {processDefaultLifeCycle(roundEnv.getElementsAnnotatedWith(DefaultLifeCycle.class));return true;
}

直接调用了processDefaultLifeCycle：

private void processDefaultLifeCycle(Set<? extends Element> elements) {// 被注解DefaultLifeCycle标识的对象for (Element e : elements) {// 拿到DefaultLifeCycle注解对象DefaultLifeCycle ca = e.getAnnotation(DefaultLifeCycle.class);String lifeCycleClassName = ((TypeElement) e).getQualifiedName().toString();String lifeCyclePackageName = lifeCycleClassName.substring(0, lifeCycleClassName.lastIndexOf('.'));lifeCycleClassName = lifeCycleClassName.substring(lifeCycleClassName.lastIndexOf('.') + 1);String applicationClassName = ca.application();if (applicationClassName.startsWith(".")) {applicationClassName = lifeCyclePackageName + applicationClassName;}String applicationPackageName = applicationClassName.substring(0, applicationClassName.lastIndexOf('.'));applicationClassName = applicationClassName.substring(applicationClassName.lastIndexOf('.') + 1);String loaderClassName = ca.loaderClass();if (loaderClassName.startsWith(".")) {loaderClassName = lifeCyclePackageName + loaderClassName;}// /TinkerAnnoApplication.tmplfinal InputStream is = AnnotationProcessor.class.getResourceAsStream(APPLICATION_TEMPLATE_PATH);final Scanner scanner = new Scanner(is);final String template = scanner.useDelimiter("\\A").next();final String fileContent = template.replaceAll("%PACKAGE%", applicationPackageName).replaceAll("%APPLICATION%", applicationClassName).replaceAll("%APPLICATION_LIFE_CYCLE%", lifeCyclePackageName + "." + lifeCycleClassName).replaceAll("%TINKER_FLAGS%", "" + ca.flags()).replaceAll("%TINKER_LOADER_CLASS%", "" + loaderClassName).replaceAll("%TINKER_LOAD_VERIFY_FLAG%", "" + ca.loadVerifyFlag());JavaFileObject fileObject = processingEnv.getFiler().createSourceFile(applicationPackageName + "." + applicationClassName);processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "Creating " + fileObject.toUri());Writer writer = fileObject.openWriter();PrintWriter pw = new PrintWriter(writer);pw.print(fileContent);pw.flush();writer.close();}}

代码比较简单，可以分三部分理解：

步骤1：首先找到被DefaultLifeCycle标识的Element(为类对象TypeElement)，得到该对象的包名，类名等信息，然后通过该对象，拿到@DefaultLifeCycle对象，获取该注解中声明属性的值。
步骤2：读取一个模板文件，读取为字符串，将各个占位符通过步骤1中的值替代。
步骤3：通过JavaFileObject将替换完成的字符串写文件，其实就是本例中的Application对象。

我们看一眼模板文件：

package %PACKAGE%;import com.tencent.tinker.loader.app.TinkerApplication;/**** Generated application for tinker life cycle**/
public class %APPLICATION% extends TinkerApplication {public %APPLICATION%() {super(%TINKER_FLAGS%, "%APPLICATION_LIFE_CYCLE%", "%TINKER_LOADER_CLASS%", %TINKER_LOAD_VERIFY_FLAG%);}}

对应我们的SimpleTinkerInApplicationLike，

@DefaultLifeCycle(application = ".SimpleTinkerInApplication",flags = ShareConstants.TINKER_ENABLE_ALL,loadVerifyFlag = false)
public class SimpleTinkerInApplicationLike extends ApplicationLike {}

主要就几个占位符：

包名，如果application属性值以点开始，则同包；否则则截取
类名，application属性值中的类名
%TINKER_FLAGS%对应flags
%APPLICATION_LIFE_CYCLE%，编写的ApplicationLike的全路径
“%TINKER_LOADER_CLASS%”，这个值我们没有设置，实际上对应@DefaultLifeCycle的loaderClass属性，默认值为com.tencent.tinker.loader.TinkerLoader
%TINKER_LOAD_VERIFY_FLAG%对应loadVerifyFlag

于是最终生成的代码为：

/**** Generated application for tinker life cycle**/
public class SimpleTinkerInApplication extends TinkerApplication {public SimpleTinkerInApplication() {super(7, "com.zhy.tinkersimplein.SimpleTinkerInApplicationLike", "com.tencent.tinker.loader.TinkerLoader", false);}}

tinker这么做的目的，文档上是这么说的：

为了减少错误的出现，推荐使用Annotation生成Application类。

这样大致了解了Application是如何生成的。

接下来我们大致看一下tinker的原理。

四、原理

来源于：https://github.com/Tencent/tinker

tinker贴了一张大致的原理图。

可以看出：

tinker将old.apk和new.apk做了diff，拿到patch.dex，然后将patch.dex与本机中apk的classes.dex做了合并，生成新的classes.dex，运行时通过反射将合并后的dex文件放置在加载的dexElements数组的前面。

运行时替代的原理，其实和Qzone的方案差不多，都是去反射修改dexElements。

两者的差异是：Qzone是直接将patch.dex插到数组的前面；而tinker是将patch.dex与app中的classes.dex合并后的全量dex插在数组的前面。

tinker这么做的目的还是因为Qzone方案中提到的CLASS_ISPREVERIFIED的解决方案存在问题；而tinker相当于换个思路解决了该问题。

接下来我们就从代码中去验证该原理。

本片文章源码分析的两条线：

应用启动时，从默认目录加载合并后的classes.dex
patch下发后，合成classes.dex至目标目录

五、源码分析

（1）加载patch

加载的代码实际上在生成的Application中调用的，其父类为TinkerApplication，在其attachBaseContext中辗转会调用到loadTinker()方法，在该方法内部，反射调用了TinkerLoader的tryLoad方法。

@Override
public Intent tryLoad(TinkerApplication app, int tinkerFlag, boolean tinkerLoadVerifyFlag) {Intent resultIntent = new Intent();long begin = SystemClock.elapsedRealtime();tryLoadPatchFilesInternal(app, tinkerFlag, tinkerLoadVerifyFlag, resultIntent);long cost = SystemClock.elapsedRealtime() - begin;ShareIntentUtil.setIntentPatchCostTime(resultIntent, cost);return resultIntent;
}

tryLoadPatchFilesInternal中会调用到loadTinkerJars方法：

private void tryLoadPatchFilesInternal(TinkerApplication app, int tinkerFlag, boolean tinkerLoadVerifyFlag, Intent resultIntent) {// 省略大量安全性校验代码if (isEnabledForDex) {//tinker/patch.info/patch-641e634c/dexboolean dexCheck = TinkerDexLoader.checkComplete(patchVersionDirectory, securityCheck, resultIntent);if (!dexCheck) {//file not found, do not load patchLog.w(TAG, "tryLoadPatchFiles:dex check fail");return;}}//now we can load patch jarif (isEnabledForDex) {boolean loadTinkerJars = TinkerDexLoader.loadTinkerJars(app, tinkerLoadVerifyFlag, patchVersionDirectory, resultIntent, isSystemOTA);if (!loadTinkerJars) {Log.w(TAG, "tryLoadPatchFiles:onPatchLoadDexesFail");return;}}
}

TinkerDexLoader.checkComplete主要是用于检查下发的meta文件中记录的dex信息（meta文件，可以查看生成patch的产物，在assets/dex-meta.txt），检查meta文件中记录的dex文件信息对应的dex文件是否存在，并把值存在TinkerDexLoader的静态变量dexList中。

TinkerDexLoader.loadTinkerJars传入四个参数，分别为application，tinkerLoadVerifyFlag（注解上声明的值，传入为false），patchVersionDirectory当前version的patch文件夹，intent，当前patch是否仅适用于art。

@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public static boolean loadTinkerJars(Application application, boolean tinkerLoadVerifyFlag, String directory, Intent intentResult, boolean isSystemOTA) {PathClassLoader classLoader = (PathClassLoader) TinkerDexLoader.class.getClassLoader();String dexPath = directory + "/" + DEX_PATH + "/";File optimizeDir = new File(directory + "/" + DEX_OPTIMIZE_PATH);ArrayList<File> legalFiles = new ArrayList<>();final boolean isArtPlatForm = ShareTinkerInternals.isVmArt();for (ShareDexDiffPatchInfo info : dexList) {//for dalvik, ignore art support dexif (isJustArtSupportDex(info)) {continue;}String path = dexPath + info.realName;File file = new File(path);legalFiles.add(file);}// just for artif (isSystemOTA) {parallelOTAResult = true;parallelOTAThrowable = null;Log.w(TAG, "systemOTA, try parallel oat dexes!!!!!");TinkerParallelDexOptimizer.optimizeAll(legalFiles, optimizeDir,new TinkerParallelDexOptimizer.ResultCallback() {});SystemClassLoaderAdder.installDexes(application, classLoader, optimizeDir, legalFiles);return true;}

找出仅支持art的dex，且当前patch是否仅适用于art时，并行去loadDex。

关键是最后的installDexes：

@SuppressLint("NewApi")
public static void installDexes(Application application, PathClassLoader loader, File dexOptDir, List<File> files)throws Throwable {if (!files.isEmpty()) {ClassLoader classLoader = loader;if (Build.VERSION.SDK_INT >= 24) {classLoader = AndroidNClassLoader.inject(loader, application);}//because in dalvik, if inner class is not the same classloader with it wrapper class.//it won't fail at dex2optif (Build.VERSION.SDK_INT >= 23) {V23.install(classLoader, files, dexOptDir);} else if (Build.VERSION.SDK_INT >= 19) {V19.install(classLoader, files, dexOptDir);} else if (Build.VERSION.SDK_INT >= 14) {V14.install(classLoader, files, dexOptDir);} else {V4.install(classLoader, files, dexOptDir);}//install donesPatchDexCount = files.size();Log.i(TAG, "after loaded classloader: " + classLoader + ", dex size:" + sPatchDexCount);if (!checkDexInstall(classLoader)) {//reset patch dexSystemClassLoaderAdder.uninstallPatchDex(classLoader);throw new TinkerRuntimeException(ShareConstants.CHECK_DEX_INSTALL_FAIL);}}
}

这里实际上就是根据不同的系统版本，去反射处理dexElements。

我们看一下V19的实现（主要我看了下本机只有个22的源码~）：

private static final class V19 {private static void install(ClassLoader loader, List<File> additionalClassPathEntries,File optimizedDirectory)throws IllegalArgumentException, IllegalAccessException,NoSuchFieldException, InvocationTargetException, NoSuchMethodException, IOException {Field pathListField = ShareReflectUtil.findField(loader, "pathList");Object dexPathList = pathListField.get(loader);ArrayList<IOException> suppressedExceptions = new ArrayList<IOException>();ShareReflectUtil.expandFieldArray(dexPathList, "dexElements", makeDexElements(dexPathList,new ArrayList<File>(additionalClassPathEntries), optimizedDirectory,suppressedExceptions));if (suppressedExceptions.size() > 0) {for (IOException e : suppressedExceptions) {Log.w(TAG, "Exception in makeDexElement", e);throw e;}}}
}

找到PathClassLoader（BaseDexClassLoader）对象中的pathList对象
根据pathList对象找到其中的makeDexElements方法，传入patch相关的对应的实参，返回Element[]对象
拿到pathList对象中原本的dexElements方法
步骤2与步骤3中的Element[]数组进行合并，将patch相关的dex放在数组的前面
最后将合并后的数组，设置给pathList

这里其实和Qzone的提出的方案基本是一致的。如果你以前未了解过Qzone的方案，可以参考此文：

Android 热补丁动态修复框架小结

（2）合成patch

这里的入口为：

 TinkerInstaller.onReceiveUpgradePatch(getApplicationContext(),Environment.getExternalStorageDirectory().getAbsolutePath() + "/patch_signed.apk");

上述代码会调用DefaultPatchListener中的onPatchReceived方法:

# DefaultPatchListener
@Override
public int onPatchReceived(String path) {int returnCode = patchCheck(path);if (returnCode == ShareConstants.ERROR_PATCH_OK) {TinkerPatchService.runPatchService(context, path);} else {Tinker.with(context).getLoadReporter().onLoadPatchListenerReceiveFail(new File(path), returnCode);}return returnCode;}

首先对tinker的相关配置（isEnable）以及patch的合法性进行检测，如果合法，则调用TinkerPatchService.runPatchService(context, path);。

public static void runPatchService(Context context, String path) {try {Intent intent = new Intent(context, TinkerPatchService.class);intent.putExtra(PATCH_PATH_EXTRA, path);intent.putExtra(RESULT_CLASS_EXTRA, resultServiceClass.getName());context.startService(intent);} catch (Throwable throwable) {TinkerLog.e(TAG, "start patch service fail, exception:" + throwable);}
}

TinkerPatchService是IntentService的子类，这里通过intent设置了两个参数，一个是patch的路径，一个是resultServiceClass，该值是调用Tinker.install的时候设置的，默认为DefaultTinkerResultService.class。由于是IntentService，直接看onHandleIntent即可，如果你对IntentService陌生，可以查看此文：Android IntentService完全解析当Service遇到Handler
。

@Override
protected void onHandleIntent(Intent intent) {final Context context = getApplicationContext();Tinker tinker = Tinker.with(context);String path = getPatchPathExtra(intent);File patchFile = new File(path);boolean result;increasingPriority();PatchResult patchResult = new PatchResult();result = upgradePatchProcessor.tryPatch(context, path, patchResult);patchResult.isSuccess = result;patchResult.rawPatchFilePath = path;patchResult.costTime = cost;patchResult.e = e;AbstractResultService.runResultService(context, patchResult, getPatchResultExtra(intent));}

比较清晰，主要关注upgradePatchProcessor.tryPatch方法，调用的是UpgradePatch.tryPatch。ps:这里有个有意思的地方increasingPriority()，其内部实现为：

private void increasingPriority() {TinkerLog.i(TAG, "try to increase patch process priority");try {Notification notification = new Notification();if (Build.VERSION.SDK_INT < 18) {startForeground(notificationId, notification);} else {startForeground(notificationId, notification);// start InnerServicestartService(new Intent(this, InnerService.class));}} catch (Throwable e) {TinkerLog.i(TAG, "try to increase patch process priority error:" + e);}
}

如果你对“保活”这个话题比较关注，那么对这段代码一定不陌生，主要是利用系统的一个漏洞来启动一个前台Service。如果有兴趣，可以参考此文：关于 Android 进程保活，你所需要知道的一切。

下面继续回到tryPatch方法：

# UpgradePatch
@Override
public boolean tryPatch(Context context, String tempPatchPath, PatchResult patchResult) {Tinker manager = Tinker.with(context);final File patchFile = new File(tempPatchPath);//it is a new patch, so we should not find a existSharePatchInfo oldInfo = manager.getTinkerLoadResultIfPresent().patchInfo;String patchMd5 = SharePatchFileUtil.getMD5(patchFile);//use md5 as versionpatchResult.patchVersion = patchMd5;SharePatchInfo newInfo;//already have patchif (oldInfo != null) {newInfo = new SharePatchInfo(oldInfo.oldVersion, patchMd5, Build.FINGERPRINT);} else {newInfo = new SharePatchInfo("", patchMd5, Build.FINGERPRINT);}//check ok, we can real recover a new patchfinal String patchDirectory = manager.getPatchDirectory().getAbsolutePath();final String patchName = SharePatchFileUtil.getPatchVersionDirectory(patchMd5);final String patchVersionDirectory = patchDirectory + "/" + patchName;//copy fileFile destPatchFile = new File(patchVersionDirectory + "/" + SharePatchFileUtil.getPatchVersionFile(patchMd5));// check md5 firstif (!patchMd5.equals(SharePatchFileUtil.getMD5(destPatchFile))) {SharePatchFileUtil.copyFileUsingStream(patchFile, destPatchFile);}//we use destPatchFile instead of patchFile, because patchFile may be deleted during the patch processif (!DexDiffPatchInternal.tryRecoverDexFiles(manager, signatureCheck, context, patchVersionDirectory, destPatchFile)) {TinkerLog.e(TAG, "UpgradePatch tryPatch:new patch recover, try patch dex failed");return false;}return true;
}

拷贝patch文件拷贝至私有目录，然后调用DexDiffPatchInternal.tryRecoverDexFiles：

protected static boolean tryRecoverDexFiles(Tinker manager, ShareSecurityCheck checker, Context context,String patchVersionDirectory, File patchFile) {String dexMeta = checker.getMetaContentMap().get(DEX_META_FILE);boolean result = patchDexExtractViaDexDiff(context, patchVersionDirectory, dexMeta, patchFile);return result;
}

直接看patchDexExtractViaDexDiff

private static boolean patchDexExtractViaDexDiff(Context context, String patchVersionDirectory, String meta, final File patchFile) {String dir = patchVersionDirectory + "/" + DEX_PATH + "/";if (!extractDexDiffInternals(context, dir, meta, patchFile, TYPE_DEX)) {TinkerLog.w(TAG, "patch recover, extractDiffInternals fail");return false;}final Tinker manager = Tinker.with(context);File dexFiles = new File(dir);File[] files = dexFiles.listFiles();...files遍历执行：DexFile.loadDexreturn true;
}

核心代码主要在extractDexDiffInternals中：

private static boolean extractDexDiffInternals(Context context, String dir, String meta, File patchFile, int type) {//parse metaArrayList<ShareDexDiffPatchInfo> patchList = new ArrayList<>();ShareDexDiffPatchInfo.parseDexDiffPatchInfo(meta, patchList);File directory = new File(dir);//I think it is better to extract the raw files from apkTinker manager = Tinker.with(context);ZipFile apk = null;ZipFile patch = null;ApplicationInfo applicationInfo = context.getApplicationInfo();String apkPath = applicationInfo.sourceDir; //base.apkapk = new ZipFile(apkPath);patch = new ZipFile(patchFile);for (ShareDexDiffPatchInfo info : patchList) {final String infoPath = info.path;String patchRealPath;if (infoPath.equals("")) {patchRealPath = info.rawName;} else {patchRealPath = info.path + "/" + info.rawName;}File extractedFile = new File(dir + info.realName);ZipEntry patchFileEntry = patch.getEntry(patchRealPath);ZipEntry rawApkFileEntry = apk.getEntry(patchRealPath);patchDexFile(apk, patch, rawApkFileEntry, patchFileEntry, info, extractedFile);}return true;
}

这里的代码比较关键了，可以看出首先解析了meta里面的信息，meta中包含了patch中每个dex的相关数据。然后通过Application拿到sourceDir，其实就是本机apk的路径以及patch文件；根据mate中的信息开始遍历，其实就是取出对应的dex文件，最后通过patchDexFile对两个dex文件做合并。

private static void patchDexFile(ZipFile baseApk, ZipFile patchPkg, ZipEntry oldDexEntry, ZipEntry patchFileEntry,ShareDexDiffPatchInfo patchInfo,  File patchedDexFile) throws IOException {InputStream oldDexStream = null;InputStream patchFileStream = null;oldDexStream = new BufferedInputStream(baseApk.getInputStream(oldDexEntry));patchFileStream = (patchFileEntry != null ? new BufferedInputStream(patchPkg.getInputStream(patchFileEntry)) : null);new DexPatchApplier(oldDexStream, patchFileStream).executeAndSaveTo(patchedDexFile);}

通过ZipFile拿到其内部文件的InputStream，其实就是读取本地apk对应的dex文件，以及patch中对应dex文件，对二者的通过executeAndSaveTo方法进行合并至patchedDexFile，即patch的目标私有目录。

（完）

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