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| --SystemServer进程--> handleSystemServerProcess()
-> RuntimeInit#zygoteInit() {
redirectLogStreams(); 重定向System.out和System.err到logcat系统.
commonInit(); nativeZygoteInit(); applicationInit(); }
--JNI--> nativeZygoteInit()
-> AndroidRuntime.cpp::com_android_internal_os_RuntimeInit_nativeZygoteInit()
-> app_main.cpp AppRunTime::onZygoteInit() { (ProcessState proc)->startThreadPool() }
-> ProcessState.cpp::spawnPooledThread(true) {
t=new PoolThread(isMain==true); // mCanCallJava默认为true
// android_atomic_add()等类似函数返回操作之前的数
t->run("Binder_1", 默认priority==PRIORITY_DEFAULT, 默认stack==0) }
--新线程--> _threadLoop() -> PoolThread::threadLoop()
-> IPCThreadState::joinThreadPool() // ioctl "/dev/binder" 加入Binder线程池, 无限阻塞获取并执行binder驱动发过来的命令
-> applicationInit()
-> invokeStatkcMain("com.android.server.SystemServer", startArgs) // args在 ZygoteInit#startSystemServer()
-> throw new ZygoteInit.MethodAndArgsCaller(m, argv) 抛异常方式扔掉初始化时多余的栈, 在ZygoteInit#main()捕捉
-> ZygoteInit#main caller.run()
-> SystemServer#main() { loadLibrary("android_servers"); init1(); }
-> init1() --JNI--> android_server_SystemServer_init1()
--C++--> system_init.cpp::system_init() {
defaultServiceManager(); // handle==0
JNI调 SystemServer#init2();
ProcessState::startThreadPool(), joinThreadPool(默认isMain==true); }
-> SystemServer#init2()
--新线程--> ServerThread#run() {
uiHandlerThread = new HandlerThread(); // 起UI线程
wmHandlerThread = new HandlerThread(); // 起WM线程
context = ActivityManagerService.main();
起各个service:
wm = WindowManagerService.main(context, power, display, inputManager, ...);
ServiceManager.addService(Context.WINDOW_SERVICE, wm);
ActivityManagerService.self().setWindowManager(wm);
wm.displayReady();
...
ActivityManagerService.self().systemReady(runnable调各个service.systemReady); // AMS准备完毕
}
-> ActivityManagerService#main() {
thr = new AThread(); thr.start(); // 新起Looper用线程: 创建AMS, looper.loop()
(ActivityThread at) = ActivityThread.systemMain(); // 本线程本Looper管理Acitivty生命周期
(ActivityManagerService m).mMainStack = new ActivityStack(m, context==at.getSystemContext(), true, thr.mLooper);
m.startRunning();
}
-> ActivityThread#systemMain() { thread=new ActivityThread(); thread.attach(system==true); }
-> ActivityThread#attach() {
system==true:
context=new ContextImpl(); context.init();
app=newApplication(Application.class, context);
mAllApplications.add(app); mInitialApplication=app; app.onCreate();
}
-> WMS#displayReady() {
displayReady(Display.DEFAULT_DISPLAY);
mDisplayReady = true;
mIsTouchDevice = mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN);
(mPolicy 就是 PhoneWindowManager).setInitialDisplaySize(...);
}
-> WMS#displayReady(DEFAULT_DISPLAY) {
DisplayContent displayContent = getDisplayContentLocked(DEFAULT_DISPLAY);
mAnimator.addDisplayLocked(displayId);
}
-> WMS#getDisplayContentLocked(DEFAULT_DISPLAY) {
Display display = mDisplayManager.getDisplay(DEFAULT_DISPLAY);
displayContent = newDisplayContentLocked(display);
}
-> DisplayManager#getDisplay(DEFAULT_DISPLAY) { DisplayManager#getOrCreateDisplayLocked(DEFAULT_DISPLAY, false); }
-> WMS#newDisplayContentLocked(display) {
displayContent = new DisplayContent(display);
mDisplaySettings.getOverscanLocked(info.name, rect);
mDisplayManagerService.setOverscan(display.getDisplayId(), rect...);
(mPolicy 就是 PhoneWindowManager).setDisplayOverscan(displayContent.getDisplay(), rect...);
}
-> AMS#systemReady(goingCallback) {
goingCallback.run();
mMainStack.resumeTopActivityLocked(null);
}
-> ActivityStack#resumeTopActivityLocked(null)
-> resumeTopActivityLocked(prev==null, options==null) { next==null: mService.startHomeActivityLocked() }
-> ActivityServiceManager#startHomeActivityLocked()
-> ActivityStack#startActivityLocked(caller==null, intent, resolvedType==null, aInfo==Launcher信息,
resultTo==null, resultWho==null, requestCode==0, callingPid==0, callingUid==0, callingPackage==null,
startFlags==0, options==null, componentSpecified==false, outActivity==null)
-> startActivityUncheckedLocked(r==new ActivityRecord(), sourceRecord==null,
startFlags==0, doResume==true, options==null)
-> startActivityLocked(r, newTask==true, doResume==true, keepCurTransition==false, options==null) {
mHistory.size() == 0: mService.mWindowManager.addAppToken(addPos==0 ...);
doResume==true: resumeTopActivityLocked(null);
}
-> resumeTopActivityLocked(null)
-> resumeTopActivityLocked(prev==null, options==null) {
(ActivityRecord next)==Launcher
(ProcessRecord next.app)==null: startSpecificActivityLocked(next, andResume==true, checkConfig==true)
}
-> startSpecificActivityLocked() { getProcessRecordLocked()==null: mService.startProcessLocked(); }
-> AMS#startProcessLocked(r.processName, r.info.applicationInfo, knownToBeDead==true, intentFlags==0,
hostingType=="activity", r.intent.getComponent(), allowWhileBooting==false, isolated==false) {
getProcessRecordLocked()==null:
app=newProcessRecordLocked(null, info, processName, isolated==false)
startProcessLocked(app, hostingType=="activity", hostingNameStr)
}
-> startProcessLocked() { startResult=Process.start("android.app.ActivityThread", ...) }
-> Process#startViaZygote(processClass=="android.app.ActivityThread", ...)
-> Process#zygoteSendArgsAndGetResult() { Binder命令zygote(app_process) fork新进程 }
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