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Android 热修复 Tinker接入及源码浅析最精彩没有之一

2017-05-04 01:21 1161 查看


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 true
signingConfig signingConfigs.release
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
debug {
debuggable true
minifyEnabled true
signingConfig signingConfigs.release
proguardFiles 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);
}

@Override
public void onBaseContextAttached(Context base) {
super.onBaseContextAttached(base);
}

@Override
public 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:
<application
android: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 {

@Override
protected 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-data
android: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 apk
tinkerOldApkPath = "${bakPath}/old.apk"
//proguard mapping file to build patch apk
tinkerApplyMappingPath = "${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.tmpl
final 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/dex
boolean dexCheck = TinkerDexLoader.checkComplete(patchVersionDirectory, securityCheck, resultIntent);
if (!dexCheck) {
//file not found, do not load patch
Log.w(TAG, "tryLoadPatchFiles:dex check fail");
return;
}
}

//now we can load patch jar
if (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 dex
if (isJustArtSupportDex(info)) {
continue;
}
String path = dexPath + info.realName;
File file = new File(path);

legalFiles.add(file);
}
// just for art
if (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 dex2opt
if (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 done
sPatchDexCount = files.size();
Log.i(TAG, "after loaded classloader: " + classLoader + ", dex size:" + sPatchDexCount);

if (!checkDexInstall(classLoader)) {
//reset patch dex
SystemClassLoaderAdder.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 InnerService
startService(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 exist
SharePatchInfo oldInfo = manager.getTinkerLoadResultIfPresent().patchInfo;
String patchMd5 = SharePatchFileUtil.getMD5(patchFile);

//use md5 as version
patchResult.patchVersion = patchMd5;
SharePatchInfo newInfo;

//already have patch
if (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 patch
final String patchDirectory = manager.getPatchDirectory().getAbsolutePath();
final String patchName = SharePatchFileUtil.getPatchVersionDirectory(patchMd5);
final String patchVersionDirectory = patchDirectory + "/" + patchName;

//copy file
File destPatchFile = new File(patchVersionDirectory + "/" + SharePatchFileUtil.getPatchVersionFile(patchMd5));
// check md5 first
if (!patchMd5.equals(SharePatchFileUtil.getMD5(destPatchFile))) {
SharePatchFileUtil.copyFileUsingStream(patchFile, destPatchFile);
}

//we use destPatchFile instead of patchFile, because patchFile may be deleted during the patch process
if (!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.loadDex
return 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 meta
ArrayList<ShareDexDiffPatchInfo> patchList = new ArrayList<>();
ShareDexDiffPatchInfo.parseDexDiffPatchInfo(meta, patchList);

File directory = new File(dir);
//I think it is better to extract the raw files from apk
Tinker manager = Tinker.with(context);
ZipFile apk = null;
ZipFile patch = null;

ApplicationInfo applicationInfo = context.getApplicationInfo();

String apkPath = applicationInfo.sourceDir; //base.apk
apk = 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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