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Android 热修复 Tinker接入及源码浅析最精彩没有之一

發布時間：2024/1/1 45 豆豆

生活随笔收集整理的這篇文章主要介紹了 Android 热修复 Tinker接入及源码浅析最精彩没有之一小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

接入Tinker

接入tinker目前給了兩種方式，一種是基于命令行的方式，類似于AndFix的接入方式；一種就是gradle的方式。

考慮早期使用Andfix的app應該挺多的，以及很多人對gradle的相關配置還是覺得比較繁瑣的，下面對兩種方式都介紹下。

（1）命令行接入

接入之前我們先考慮下，接入的話，正常需要的前提（開啟混淆的狀態）。

對于API

一般來說，我們接入熱修庫，會在Application#onCreate中進行一下初始化操作。然后在某個地方去調用類似loadPatch這樣的API去加載patch文件。
對于patch的生成

簡單的方式就是通過兩個apk做對比然后生成；需要注意的是：兩個apk做對比，需要的前提條件，第二次打包混淆所使用的mapping文件應該和線上apk是一致的。

最后就是看看這個項目有沒有需要配置混淆；

有了大致的概念，我們就基本了解命令行接入tinker，大致需要哪些步驟了。

依賴引入

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

順便加一下簽名的配置：

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'}} }

文末會有demo的下載地址，可以直接參考build.gradle文件，不用擔心這些簽名文件去哪找。

API引入

API主要就是初始化和loadPacth。

正常情況下，我們會考慮在Application的onCreate中去初始化，不過tinker推薦下面的寫法：

@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通過名字你可能會猜，并非是Application的子類，而是一個類似Application的類。

tinker建議編寫一個ApplicationLike的子類，你可以當成Application去使用，注意頂部的注解：@DefaultLifeCycle，其application屬性，會在編譯期生成一個SimpleTinkerInApplication類。

所以，雖然我們這么寫了，但是實際上Application會在編譯期生成，所以AndroidManifest.xml中是這樣的：

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

編寫如果報紅，可以build下。

這樣其實也能猜出來，這個注解背后有個Annotation Processor在做處理，如果你沒了解過，可以看下：

Android 如何編寫基于編譯時注解的項目

通過該文會對一個編譯時注解的運行流程和基本API有一定的掌握，文中也會對tinker該部分的源碼做解析。

上述，就完成了tinker的初始化，那么調用loadPatch的時機，我們直接在Activity中添加一個Button設置：

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");} }

我們會將patch文件直接push到sdcard根目錄；

所以一定要注意：添加SDCard權限，如果你是6.x以上的系統，自己添加上授權代碼，或者手動在設置頁面打開SDCard讀寫權限。

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

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

到此API相關的就結束了，剩下的就是考慮patch如何生成。

patch生成

tinker提供了patch生成的工具，源碼見：tinker-patch-cli，打成一個jar就可以使用，并且提供了命令行相關的參數以及文件。

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，例如簽名文件等。

這里我們直接使用tinker提供的簽名文件，所以不需要做修改，不過里面有個Application的item修改為與本例一致：

大致的文件結構如下：

可以在tinker-patch-cli中提取，或者直接下載文末的例子。

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

可以copy到與proguard-rules.pro同目錄，同時在第二次打修復包的時候，在proguard-rules.pro中添加上：

-applymapping mapping.txt

保證后續的打包與線上包使用的是同一個mapping文件。

tinker本身的混淆相關配置，可以參考：

tinker_proguard.pro

如果，你對該部分描述不了解，可以直接查看源碼即可。

測試

首先隨便生成一個apk（API、混淆相關已經按照上述引入），安裝到手機或者模擬器上。

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

兩次的apk，可以通過命令行指令去生成patch文件。

如果你下載本例，命令需要在[該目錄]下執行。

最終會在output文件夾中生成產物：

我們直接將patch_signed.apk push到sdcard，點擊loadpatch，一定要觀察命令行是否成功。

本例修改了title。

點擊loadPatch，觀察log，如果成功，應用默認為重啟，然后再次啟動即可達到修復效果。

到這里命令行的方式就介紹完了，和Andfix的接入的方式基本上是一樣的。

值得注意的是:該例僅展示了基本的接入，對于tinker的各種配置信息，還是需要去讀tinker的文檔（如果你確定要使用）tinker-wiki。

（2）gradle接入

gradle接入的方式應該算是主流的方式，所以tinker也直接給出了例子，單獨將該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，以及相關配置。

在你每次build時，會在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，可以通過：

./gradlew tinkerPatchRelease // 或者 ./gradlew tinkerPatchDebug

生成。

生成目錄為:build/outputs/tinkerPatch

需要注意的是，需要在app/build.gradle中設置相比較的apk（即old.apk，本次為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的自定義擴展的方式，具體還可以參考：

Tinker-自定義擴展

所以，如果你使用命令行方式接入，也不要忘了學習下其支持哪些擴展。

三、Application是如何編譯時生成的

從注釋和命名上看：

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

明顯是該庫，其結構如下：

典型的編譯時注解的項目，源碼見tinker-android-anno。

入口為com.tencent.tinker.anno.AnnotationProcessor，可以在該services/javax.annotation.processing.Processor文件中找到處理類全路徑。

再次建議，如果你不了解，簡單閱讀下Android 如何編寫基于編譯時注解的項目該文。

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; }

直接調用了processDefaultLifeCycle：

private void processDefaultLifeCycle(Set<? extends Element> elements) {// 被注解DefaultLifeCycle標識的對象for (Element e : elements) {// 拿到DefaultLifeCycle注解對象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();}}

代碼比較簡單，可以分三部分理解：

步驟1：首先找到被DefaultLifeCycle標識的Element(為類對象TypeElement)，得到該對象的包名，類名等信息，然后通過該對象，拿到@DefaultLifeCycle對象，獲取該注解中聲明屬性的值。
步驟2：讀取一個模板文件，讀取為字符串，將各個占位符通過步驟1中的值替代。
步驟3：通過JavaFileObject將替換完成的字符串寫文件，其實就是本例中的Application對象。

我們看一眼模板文件：

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%);}}

對應我們的SimpleTinkerInApplicationLike，

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

主要就幾個占位符：

包名，如果application屬性值以點開始，則同包；否則則截取
類名，application屬性值中的類名
%TINKER_FLAGS%對應flags
%APPLICATION_LIFE_CYCLE%，編寫的ApplicationLike的全路徑
“%TINKER_LOADER_CLASS%”，這個值我們沒有設置，實際上對應@DefaultLifeCycle的loaderClass屬性，默認值為com.tencent.tinker.loader.TinkerLoader
%TINKER_LOAD_VERIFY_FLAG%對應loadVerifyFlag

于是最終生成的代碼為：

/**** 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這么做的目的，文檔上是這么說的：

為了減少錯誤的出現，推薦使用Annotation生成Application類。

這樣大致了解了Application是如何生成的。

接下來我們大致看一下tinker的原理。

四、原理

來源于：https://github.com/Tencent/tinker

tinker貼了一張大致的原理圖。

可以看出：

tinker將old.apk和new.apk做了diff，拿到patch.dex，然后將patch.dex與本機中apk的classes.dex做了合并，生成新的classes.dex，運行時通過反射將合并后的dex文件放置在加載的dexElements數組的前面。

運行時替代的原理，其實和Qzone的方案差不多，都是去反射修改dexElements。

兩者的差異是：Qzone是直接將patch.dex插到數組的前面；而tinker是將patch.dex與app中的classes.dex合并后的全量dex插在數組的前面。

tinker這么做的目的還是因為Qzone方案中提到的CLASS_ISPREVERIFIED的解決方案存在問題；而tinker相當于換個思路解決了該問題。

接下來我們就從代碼中去驗證該原理。

本片文章源碼分析的兩條線：

應用啟動時，從默認目錄加載合并后的classes.dex
patch下發后，合成classes.dex至目標目錄

五、源碼分析

（1）加載patch

加載的代碼實際上在生成的Application中調用的，其父類為TinkerApplication，在其attachBaseContext中輾轉會調用到loadTinker()方法，在該方法內部，反射調用了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中會調用到loadTinkerJars方法：

private void tryLoadPatchFilesInternal(TinkerApplication app, int tinkerFlag, boolean tinkerLoadVerifyFlag, Intent resultIntent) {// 省略大量安全性校驗代碼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主要是用于檢查下發的meta文件中記錄的dex信息（meta文件，可以查看生成patch的產物，在assets/dex-meta.txt），檢查meta文件中記錄的dex文件信息對應的dex文件是否存在，并把值存在TinkerDexLoader的靜態變量dexList中。

TinkerDexLoader.loadTinkerJars傳入四個參數，分別為application，tinkerLoadVerifyFlag（注解上聲明的值，傳入為false），patchVersionDirectory當前version的patch文件夾，intent，當前patch是否僅適用于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;}

找出僅支持art的dex，且當前patch是否僅適用于art時，并行去loadDex。

關鍵是最后的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);}} }

這里實際上就是根據不同的系統版本，去反射處理dexElements。

我們看一下V19的實現（主要我看了下本機只有個22的源碼~）：

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）對象中的pathList對象

根據pathList對象找到其中的makeDexElements方法，傳入patch相關的對應的實參，返回Element[]對象

拿到pathList對象中原本的dexElements方法

步驟2與步驟3中的Element[]數組進行合并，將patch相關的dex放在數組的前面

最后將合并后的數組，設置給pathList

這里其實和Qzone的提出的方案基本是一致的。如果你以前未了解過Qzone的方案，可以參考此文：

Android 熱補丁動態修復框架小結

（2）合成patch

這里的入口為：

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

上述代碼會調用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;}

首先對tinker的相關配置（isEnable）以及patch的合法性進行檢測，如果合法，則調用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的子類，這里通過intent設置了兩個參數，一個是patch的路徑，一個是resultServiceClass，該值是調用Tinker.install的時候設置的，默認為DefaultTinkerResultService.class。由于是IntentService，直接看onHandleIntent即可，如果你對IntentService陌生，可以查看此文：Android IntentService完全解析當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));}

比較清晰，主要關注upgradePatchProcessor.tryPatch方法，調用的是UpgradePatch.tryPatch。ps:這里有個有意思的地方increasingPriority()，其內部實現為：

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);} }

如果你對“保活”這個話題比較關注，那么對這段代碼一定不陌生，主要是利用系統的一個漏洞來啟動一個前臺Service。如果有興趣，可以參考此文：關于 Android 進程保活，你所需要知道的一切。

下面繼續回到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; }

拷貝patch文件拷貝至私有目錄，然后調用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遍歷執行：DexFile.loadDexreturn true; }

核心代碼主要在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; }

這里的代碼比較關鍵了，可以看出首先解析了meta里面的信息，meta中包含了patch中每個dex的相關數據。然后通過Application拿到sourceDir，其實就是本機apk的路徑以及patch文件；根據mate中的信息開始遍歷，其實就是取出對應的dex文件，最后通過patchDexFile對兩個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);}

通過ZipFile拿到其內部文件的InputStream，其實就是讀取本地apk對應的dex文件，以及patch中對應dex文件，對二者的通過executeAndSaveTo方法進行合并至patchedDexFile，即patch的目標私有目錄。

（完）

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