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Android源码学习- APP启动流程(Android12源码)

  • 2026-05-12 13:32:34
Android源码学习- APP启动流程(Android12源码)

排版:Vincent Chau

前言:

百度一搜能找到很多讲APP启动流程的,但是往往要么就是太老旧(还是基于android6去分析的),要么就是不全(往往只讲了整个流程的一小部分)。所以我结合网上现有的文章,以及源码的阅读和调试,耗费了3整天的时间,力求写出一篇最完整,最详细,最通俗易懂的文章,来讲清楚在android上,APP是如何启动的。

一、APP启动流程概览

涉及到四个进程之间的通信,分别是Laucher进程(桌面APP),SystemServer进程(AMS所属进程),Zygote进程(系统和所有APP的创建进程),APP进程。

APP简要的启动流程是这样的:
1.Laucher进程会通过binder的方式通知SystemServer进程。

2.然后SystemServer进程中的AMS会查询对应的Activity栈信息,如果对应APP进程不存在则会加载占位图。然后通过socket的方式通知Zygote去创建APP进程。

3.APP进程创建后会执行main方法,然后通知AMS

4.AMS收到信息后会继续通知APP去创建Application,并且接下来会通知APP进程取拉起Activity。

5.APP进程依次收到通知后,会依次完成加载APK,初始化Application,执行Activtiy生命周期等操作。最终会把首屏展示出来。

流程图如下,建议双击放大后观看:

 接下来的几章,会按照上面的流程逐一拆解分析:

二、Launcher通知AMS启动APP

Launcher进程其实和普通APP是一样的,甚至我们可以把自己的APP设置为桌面APP。

2.1 Launcher获取到AMS的binder

而Launcher通知AMS的流程和正常APP也是一样的,通过ServiceManager获取到AMS的binder引用。这里提到了ServiceManager,其实ServiceManagerService也是单独的一个进程,其存储了所有APP所需要的binder引用。而且其地址是固定的,所以获取ServiceManager可以直接获取。

2.2 通知ActivityManagerService

Launcher通过上述获取到的binder通知到AMS,调用的方式是startActivityWithFeature。

而由于AMS实现了IActivityManager.Stub的实现,所以其startActivityWithFeature方法会收到launcher发过来的通知。

2.3 系统进程加载占位图

AMS中,会交由ActivityTaskManagerService去进行对应启动任务的处理。最终会交给ActivityStart进行处理。

ActivityStart中,首先会进行一个逻辑判断,如果进程不存在,则首先会加载APP中MainActivity的主题作为背景图,显示到屏幕上。这一步操作是发生在SystemServer进程的,APP进程还未创建。

android11开始支持启动动画,逻辑也是在这里处理的。

2.4 AMS进行启动操作

一个进程中会有多个任务栈,栈对应的是Task类。

一个任务栈中会有多个Activity对象,这个Activity对象在AMS中使用ActivityRecord记录。

这一块的具体逻辑,我会单独写一篇Activity的启动逻辑来进行描述。

这里暂时先简单描述下,如果AMS发现进程不存在,会去通知Zygote的进行进程fork就好,对应的fork逻辑在下一章。

三、Zygote创建APP进程

3.1 AMS中内部逻辑执行

ActivityTaskManagerService调用startProcessAsync方法会去负责创建APP进程,这是异步的,通过handler转发后最终会调用到LocalService.startProcess()方法。

然后会通知到ProcessList.startProcessLocked方法,这个方法中,会构造一个对象ProcessRecord对象,然后把各种信息添加到这个对象中。

接下来会调用到ProcessList.startProcessLocked这个方法,这个方法主要是负责把各种信息转换为runtimeFlags标记位,连同上面构造的ProcessRecord继续传入下一层。

最终通知到Process.start方法,然后交由ZygoteProcess.start方法,最终传递到startViaZygote方法。

3.2 请求参数拼接成字符串发送给Zygote

startViaZygote这个方法中,会把各种配置参数拼接为字符串。

最终在ZygoteProcess.attemptUsapSendArgsAndGetResult方法中,通过LocalSocket的方式把上面拼接的字符串内容传递给Zygote进程。并且从socket中读取返回值,返回值的PID>0则证明进程创建成功。

3.3 Zygote进程逻辑

在了解Zygote进程如何解析AMS发送过来的请求之前,我们先简单了解下Zygote进程创建后的一些基本逻辑。如下图:

一。Zygote进程创建后,最开始的入口是在C层,app_main.cpp文件的main方法(该进程由Init进程启动,这里就不扩展了),在main方法中会配置一些JVM的参数,这个和JAVA的虚拟机参数配置类似。最终会调用到AndroidRuntime.cpp中的start函数,去启动JVM虚拟机。

    1. if(startVm(&mJavaVM,&env, zygote, primary_zygote)!=0){

    2. return;

    3. }

二。虚拟机创建之后,会通过native层反射找到main函数,并调用ZygoteInit类的main函数。

AndroidRumtime.cpp的start方法中:

    1. if(startClass ==NULL){

    2. ALOGE("JavaVM unable to locate class '%s'\n", slashClassName);

    3. /* keep going */

    4. }else{

    5. jmethodID startMeth = env->GetStaticMethodID(startClass,"main",

    6. "([Ljava/lang/String;)V");

    7. if(startMeth ==NULL){

    8. ALOGE("JavaVM unable to find main() in '%s'\n", className);

    9. /* keep going */

    10. }else{

    11. env->CallStaticVoidMethod(startClass, startMeth, strArray);

    12. #if0

    13. if(env->ExceptionCheck())

    14. threadExitUncaughtException(env);

    15. #endif

    16. }

    17. }

三。ZygoteInit类的main方法中,会做如下几件事:

第一步,把自身的进程ID设置为0,并且没有parent进程。

第二步,会进行一系列的初始化操作,比如加载native环境,加载JVM环境,加载系统类,加载系统资源等等。都在其preload方法中。

第三步,如果是首次执行,则会创建SystemServer进程。这也是Zygote进程的大儿子。AMS,WMS都属于SystemServer进程。

第四步,会创建zygoteServer对象,并且调用其runSelectLoop方法。监听socket不断的接传递过来的信息

第五步,Zygote进程的fork,其实是复制一个原原本本的自己。runSelectLoop方法中其实会去执行fork操作,这个后面会讲,我们这里只需要知道,执行到caller.run();这一句的时候,已经处于APP进程状态了。

    1. publicstaticvoid main(String[] argv){

    2. ZygoteServer zygoteServer =null;

    3. // Mark zygote start. This ensures that thread creation will throw

    4. // an error.

    5. ZygoteHooks.startZygoteNoThreadCreation();

    6. // Zygote goes into its own process group.

    7. try{

    8. Os.setpgid(0,0);

    9. }catch(ErrnoException ex){

    10. thrownewRuntimeException("Failed to setpgid(0,0)", ex);

    11. }

    12. ...

    13. if(!enableLazyPreload){

    14. bootTimingsTraceLog.traceBegin("ZygotePreload");

    15. EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_START,

    16. SystemClock.uptimeMillis());

    17. //2.初始化操作

    18. preload(bootTimingsTraceLog);

    19. EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_END,

    20. SystemClock.uptimeMillis());

    21. bootTimingsTraceLog.traceEnd();// ZygotePreload

    22. }

    23. // Do an initial gc to clean upafter startup

    24. bootTimingsTraceLog.traceBegin("PostZygoteInitGC");

    25. gcAndFinalize();

    26. bootTimingsTraceLog.traceEnd();// PostZygoteInitGC

    27. bootTimingsTraceLog.traceEnd();// ZygoteInit

    28. Zygote.initNativeState(isPrimaryZygote);

    29. ZygoteHooks.stopZygoteNoThreadCreation();

    30. zygoteServer =newZygoteServer(isPrimaryZygote);

    31. if(startSystemServer){

    32. //3.首次启动时,会启动系统进程

    33. Runnable r = forkSystemServer(abiList, zygoteSocketName, zygoteServer);

    34. // {@code r ==null} in the parent (zygote) process, and {@code r !=null} in the

    35. // child (system_server) process.

    36. if(r !=null){

    37. r.run();

    38. return;

    39. }

    40. }

    41. //4.启动无限循环监听socket

    42. caller= zygoteServer.runSelectLoop(abiList);

    43. }catch(Throwable ex){

    44. Log.e(TAG,"System zygote died with fatal exception", ex);

    45. throw ex;

    46. }finally{

    47. if(zygoteServer !=null){

    48. zygoteServer.closeServerSocket();

    49. }

    50. }

    51. // We're in the child process and have exited the select loop. Proceed to execute the

    52. // command.

    53. if(caller!=null){

    54. //5.这里的调用已经是在APP进程了,zygote进程永远不会执行到这里

    55. caller.run();

    56. }

    57. }

3.4 收到通知后去fork产生APP进程

runSelectLoop方法中,会开启一个无限循环。如果收到了消息

如果收到了消息,则会调用ZygoteConnection.processCommand去处理。

    1. Runnable runSelectLoop (String abiList){

    2. // ...

    3. while(true){

    4. // ...

    5. try{

    6. ZygoteConnection connection = peers.get(pollIndex);

    7. boolean multipleForksOK =!isUsapPoolEnabled()

    8. &&ZygoteHooks.isIndefiniteThreadSuspensionSafe();

    9. //收到消息,处理消息并且返回runnable。

    10. finalRunnable command =

    11. connection.processCommand(this, multipleForksOK);

    12. // TODO (chriswailes): Is this extra check necessary?

    13. if(mIsForkChild){

    14. if(command ==null){

    15. thrownewIllegalStateException("command == null");

    16. }

    17. //子进程执行,子进程的mIsForkChild会被设置为true,则返回command

    18. return command;

    19. }else{

    20. //Zygote进程执行,则继续执行循环

    21. // ...

    22. }

    23. }

    24. }

    25. }

而在processCommand中,会解析收到的参数,最终调用Zygote.forkAndSpecialize去fork一个新进程。这个方法虽然只会调用一次,返回因为进程是拷贝的,所以实际上会有两次返回,返回两个pid。pid为0时为子进程,设置标记为子进程。反之仍就还是Zygote进程。

    1. pid =Zygote.forkAndSpecialize(parsedArgs.mUid, parsedArgs.mGid,

    2. parsedArgs.mGids, parsedArgs.mRuntimeFlags, rlimits,

    3. parsedArgs.mMountExternal, parsedArgs.mSeInfo, parsedArgs.mNiceName,

    4. fdsToClose, fdsToIgnore, parsedArgs.mStartChildZygote,

    5. parsedArgs.mInstructionSet, parsedArgs.mAppDataDir,

    6. parsedArgs.mIsTopApp, parsedArgs.mPkgDataInfoList,

    7. parsedArgs.mAllowlistedDataInfoList, parsedArgs.mBindMountAppDataDirs,

    8. parsedArgs.mBindMountAppStorageDirs);

    9. try{

    10. if(pid ==0){

    11. //in child

    12. zygoteServer.setForkChild();

    13. zygoteServer.closeServerSocket();

    14. IoUtils.closeQuietly(serverPipeFd);

    15. serverPipeFd =null;

    16. return handleChildProc(parsedArgs, childPipeFd,

    17. parsedArgs.mStartChildZygote);

    18. }else{

    19. //In the parent. A pid <0 indicates a failure and will be handled in

    20. // handleParentProc.

    21. IoUtils.closeQuietly(childPipeFd);

    22. childPipeFd =null;

    23. handleParentProc(pid, serverPipeFd);

    24. returnnull;

    25. }

    26. }finally{

    27. IoUtils.closeQuietly(childPipeFd);

    28. IoUtils.closeQuietly(serverPipeFd);

    29. }

3.5 调用ActivityThread.main方法

调用到handleChildProc方法时,已经处于APP进程的状态。

该方法掉调用到ZygoteInit.zygoteInit()方法,相关代码如下:

    1. publicstaticRunnablezygoteInit(int targetSdkVersion,long[] disabledCompatChanges,

    2. String[] argv,ClassLoader classLoader){

    3. ...

    4. RuntimeInit.redirectLogStreams();

    5. RuntimeInit.commonInit();

    6. ZygoteInit.nativeZygoteInit();

    7. returnRuntimeInit.applicationInit(targetSdkVersion, disabledCompatChanges, argv,

    8. classLoader);

    9. }

第一步,把System.out的输出重定向到Logcat中;

第二步,在commonInit方法中,设置Thread的UncaughtExceptionPreHandler和DefaultUncaughtExceptionHandler。用于应用发生异常时的处理,这里稍微扩展下,DefaultUncaughtExceptionHandler设置的是RuntimeInit.KillApplicationHandler,所以所有最终未处理的异常都会走到这个类中。

第三步,native中进行相关的初始化。

最后一步,做VM虚拟机的一些配置,然后就会调用findStaticMain方法。

接下来,我们看下findStaticMain方法:

    1. protectedstaticRunnablefindStaticMain(String className,String[] argv,

    2. ClassLoader classLoader){

    3. Class<?> cl;

    4. try{

    5. cl =Class.forName(className,true, classLoader);

    6. }catch(ClassNotFoundException ex){

    7. thrownewRuntimeException(

    8. "Missing class when invoking static main "+ className,

    9. ex);

    10. }

    11. Method m;

    12. try{

    13. m = cl.getMethod("main",newClass[]{String[].class});

    14. }catch(NoSuchMethodException ex){

    15. thrownewRuntimeException(

    16. "Missing static main on "+ className, ex);

    17. }catch(SecurityException ex){

    18. thrownewRuntimeException(

    19. "Problem getting static main on "+ className, ex);

    20. }

    21. int modifiers = m.getModifiers();

    22. if(!(Modifier.isStatic(modifiers)&&Modifier.isPublic(modifiers))){

    23. thrownewRuntimeException(

    24. "Main method is not public and static on "+ className);

    25. }

    26. /*

    27. * This throw gets caught in ZygoteInit.main(), which responds

    28. * by invoking the exception's run() method. This arrangement

    29. * clears up all the stack frames that were required in setting

    30. * up the process.

    31. */

    32. returnnewMethodAndArgsCaller(m, argv);

    33. }

这里只看到出现了main方法,并没有看到ActivityThread类的声明。所以,是如何最终选择启动类类中的main方法呢?其实原理很简单,这个方法中有一个className参数,这个其实就是ActivityThread类,它是通过socket传递过来的一个参数,其定义在ProcessList的startProcessLocked方法中

所以最后返回的其实是一个runnable接口实现类,而这个runnable中实现了调用ActivityThread中main方法的逻辑。

还记得3.3中Zygote创建后的逻辑吗?最后一句是调用 caller.run();

是的,这个caller就是最后返回的runnable接口实现类,去完成调用main方法的操作。

四、APP进程创建初始化操作

app进程初始化的操作比较简单,主要做了两件事,初始化looper,以及通知AMS。(注意,这里只是APP进程创建了,但是还没有加载APK中的任何类)

4.1 初始化MainLooper

调用main方法的线程,会被设置为主线程,Looper此时会开启无限循环。

    1. main(){

    2. //looper绑定主线程

    3. Looper.prepareMainLooper();

    4. //通知AMS

    5. ActivityThread thread =newActivityThread();

    6. thread.attach(false, startSeq);

    7. //looper开启无限循环读取消息

    8. Looper.loop();

    9. }

4.2 通知AMS

ActivityThread.attach方法中,实现逻辑也是比较简单的,直接通过binder通知AMS,并且把自身的binder(ApplicationThread)也传递给AMS。

    1. finalIActivityManagermgr=ActivityManager.getService();

    2. try{

    3. mgr.attachApplication(mAppThread, startSeq);

    4. }catch(RemoteException ex){

    5. throw ex.rethrowFromSystemServer();

    6. }

这里AMS的binder是直接通过ServierManager的方式获取的。ServierManager存储了所有的binder引用,注册的形式,AMS在启动的时候去注册。

五、AMS通知APP进程进行各种生命周期操作

5.1 唤起APP初始化并拉起APP首屏

ActivityManagerService的attachApplication方法会收到APP传递过来的消息,然后交由attachApplicationLocked处理。

attachApplicationLocked中主要负责两件事:

1.通知APP进程进行初始化操作;

2.进行一些列操作,最终通知APP拉起指定的MainActivity。

说到这,问一个问题1,为什么明明是串行通知APP去执行的,而APP那边不会出现先加载Activity,再去初始化应用的情况呢?答案在下一小节。

    1. @GuardedBy("this")

    2. privateboolean attachApplicationLocked(@NonNullIApplicationThread thread,

    3. int pid,int callingUid,long startSeq){

    4. ...

    5. if(app.getIsolatedEntryPoint()!=null){

    6. ...

    7. }elseif(instr2!=null){

    8. //1通知APP进行初始化操作

    9. thread.bindApplication(processName, appInfo, providerList,

    10. instr2.mClass,

    11. profilerInfo, instr2.mArguments,

    12. instr2.mWatcher,

    13. instr2.mUiAutomationConnection, testMode,

    14. mBinderTransactionTrackingEnabled, enableTrackAllocation,

    15. isRestrictedBackupMode ||!normalMode, app.isPersistent(),

    16. newConfiguration(app.getWindowProcessController().getConfiguration()),

    17. app.getCompat(), getCommonServicesLocked(app.isolated),

    18. mCoreSettingsObserver.getCoreSettingsLocked(),

    19. buildSerial, autofillOptions, contentCaptureOptions,

    20. app.getDisabledCompatChanges(), serializedSystemFontMap);

    21. }else{

    22. ...

    23. 同上

    24. }

    25. ...

    26. // See if the top visible activity is waiting torunin this process...

    27. if(normalMode){

    28. try{

    29. //拉起

    30. didSomething = mAtmInternal.attachApplication(app.getWindowProcessController());

    31. }catch(Exception e){

    32. Slog.wtf(TAG,"Exception thrown launching activities in "+ app, e);

    33. badApp =true;

    34. }

    35. }

    36. ...

    37. returntrue;

    38. }

5.2 APP进行初始化操作

ActivityThread中ApplicationThread的bindApplication会收到通知,通过handler交给主线程去处理。所以我们也就知道上面问题1的答案了,无论是初始化APP,还是拉起Activity,都是最终交给Handler切换到主线程处理的。所以哪怕初始化APP是耗时操作,拉起Activity的任务也得排队等到前面任务执行完了才能执行。

最终通过handler是交给handleBindApplciation去完成APP的初始化逻辑的。主要包含下面几个操作:

1.使用classLoader去加载APK中的DEX文件。

2.加载APK中的资源。

3.反射生成Application类,并调用其attachBaseApplication方法。

4.调用Application的onCreate方法。

    1. @UnsupportedAppUsage

    2. privatevoid handleBindApplication(AppBindDatadata){

    3. //1.classLoader加载APK中的dex,并且加载APK的资源

    4. finalContextImpl appContext =ContextImpl.createAppContext(this,data.info);

    5. //Continue loading instrumentation.

    6. //2.生成代理类

    7. mInstrumentation =newInstrumentation();

    8. mInstrumentation.basicInit(this);

    9. // Allow disk access during application and provider setup. This could

    10. //block processing ordered broadcasts, but later processing would

    11. // probably endup doing the same disk access.

    12. Application app;

    13. //3.声明application

    14. app =data.info.makeApplication(data.restrictedBackupMode,null);

    15. ...

    16. //4.调用Application的onCreate

    17. mInstrumentation.onCreate(data.instrumentationArgs);

    18. }

onCreate创建完成后并不会通知AMS,因为activity的拉起操作和初始化Application在AMS中是串行的。

5.3 AMS中处理Activity启动逻辑

5.1中讲到attachApplicationLocked会最终通知APP去拉起Activity,那么整个流程是怎样的呢?

会执行下面这样的调用顺序。

ActivityManagerService.attachApplicationLocked->

ActivityTaskManagerService.LocalService.attachApplication->

RootWindowContainer.attachApplication->

RootWindowContainer.startActivityForAttachedApplicationIfNeeded->

ActivityTaskSupervisor.realStartActivityLocked

到了realStartActivityLocked这一步,正好对应2.4所讲的。APP进程存在的也会调用这个方法,而不存在则先创建进程,最终也会执行到这一步。

realStartActivityLocked中创建Activity的生命周期事务,最终通过ClientLifecycleManager.scheduleTransaction通过binder发送到APP进程的ApplicationThread.scheduleTransaction方法中,则AMS流程就完成了。

5.4 APP完成Activity的启动

生命周期事务是安卓8.0之后出现的,简单来说就是之前的模式是:

AMS发一个协商好消息,APP收到后,根据消息内存来决定自己去做操作;

而事务模式下,AMS发送一系列事务到APP进程,APP收到后,直接去执行这一系列的事务。而这些事务就是activity的生命周期调用。

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  1. 请求信息 : 2026-05-13 02:25:35 HTTP/2.0 GET : https://g.sjds.net/a/458375.html
  2. 运行时间 : 0.169564s [ 吞吐率:5.90req/s ] 内存消耗:4,510.55kb 文件加载:140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=96d15bc61810e46c4a762737e38f47c5
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  1. CONNECT:[ UseTime:0.000688s ] mysql:host=127.0.0.1;port=3306;dbname=g_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001110s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000574s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.013664s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001180s ]
  6. SELECT * FROM `set` [ RunTime:0.008745s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001257s ]
  8. SELECT * FROM `article` WHERE `id` = 458375 LIMIT 1 [ RunTime:0.002621s ]
  9. UPDATE `article` SET `lasttime` = 1778610335 WHERE `id` = 458375 [ RunTime:0.022831s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.002658s ]
  11. SELECT * FROM `article` WHERE `id` < 458375 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001901s ]
  12. SELECT * FROM `article` WHERE `id` > 458375 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001488s ]
  13. SELECT * FROM `article` WHERE `id` < 458375 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008778s ]
  14. SELECT * FROM `article` WHERE `id` < 458375 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009385s ]
  15. SELECT * FROM `article` WHERE `id` < 458375 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005611s ]
0.172942s