Android6.0 keyguard锁屏加载流程分析

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android6.0 keyguard锁屏加载流程分析，锁屏界面的加载通常在android中有两种方式触发：android开机和screenoff(灭屏)后，再screenon;

先来看

android系统开机时候的锁屏加载流程：

首先在系统启动过程中，会进入到systemserver.java的startotherservices()方法：

初始化windowmanagerservice;

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wm=windowmanagerservice.main(context,inputmanager,

mfactorytestmode!=factorytest.factory_test_low_level,

!mfirstboot,monlycore); 调用systemready()方法，表示系统准备启动;

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try{

wm.systemready();

}catch(throwablee){

reportwtf("makingwindowmanagerserviceready",e);

} 调用windowmanagerpolicy.java的systemready()方法

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publicvoidsystemready(){

mpolicy.systemready();

} 而这个mpolicy 是由phonewindowmanager.java的构造方法构造出来的;

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finalwindowmanagerpolicympolicy=newphonewindowmanager(); 也就是说最终会调用到phonewindowmanager.java的systemready()方法，在这个方法内初始化keyguardservicedelegate对象并调用systemready()方法;

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mkeyguarddelegate=newkeyguardservicedelegate(mcontext);

mkeyguarddelegate.onsystemready(); 在keyguardservicedelegate.java类内，继续调用keyguardservicewrapper.java的systemready()方法;

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publicvoidonsystemready(){

if(mkeyguardservice!=null){

mkeyguardservice.onsystemready();

}else{

mkeyguardstate.systemisready=true;

}

} 在keyguardservicewrapper.java内使用aidl调用keyguardservice.java的onsystemready()方法;

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@override//binderinterface

publicvoidonsystemready(){

try{

mservice.onsystemready();

}catch(remoteexceptione){

slog.w(tag,"remoteexception",e);

}

} 在keyguardservice.java内调用keyguardviewmediator.java的onsystemready()方法;

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@override//binderinterface

publicvoidonsystemready(){

checkpermission();

mkeyguardviewmediator.onsystemready();

}

最终在keyguardviewmediator.java的onsystemready()方法内调用dokeyguardlocked()开始锁屏加载流程;

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/**

*letusknowthatthesystemisreadyafterstartup.

*/

publicvoidonsystemready(){

msearchmanager=(searchmanager)mcontext.getsystemservice(context.search_service);

synchronized(this){

if(debug)log.d(tag,"onsystemready");

msystemready=true;

dokeyguardlocked(null);

mupdatemonitor.registercallback(mupdatecallback);

}

//mostservicesaren'tavailableuntilthesystemreachesthereadystate,sowe

//senditherewhenthedevicefirstboots.

maybesenduserpresentbroadcast();

} keyguardviewmediator.java的dokeyguardlocked()方法;

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/**

*enablethekeyguardifthesettingsareappropriate.

*/

privatevoiddokeyguardlocked(bundleoptions){

//ifanotherappisdisablingus,don'tshow

if(!mexternallyenabled){

return;

}

//ifthekeyguardisalreadyshowing,don'tbother

if(mstatusbarkeyguardviewmanager.isshowing()){

resetstatelocked();

return;

}

//ifthesetupwizardhasn'trunyet,don'tshow

finalbooleanrequiresim=!systemproperties.getboolean("keyguard.no_require_sim",false);

finalbooleanabsent=subscriptionmanager.isvalidsubscriptionid(

mupdatemonitor.getnextsubidforstate(icccardconstants.state.absent));

finalbooleandisabled=subscriptionmanager.isvalidsubscriptionid(

mupdatemonitor.getnextsubidforstate(icccardconstants.state.perm_disabled));

finalbooleanlockedormissing=mupdatemonitor.issimpinsecure()

||((absent||disabled)&&requiresim);

if(!lockedormissing&&shouldwaitforprovisioning()){

return;

}

if(mlockpatternutils.islockscreendisabled(keyguardupdatemonitor.getcurrentuser())

&&!lockedormissing){

return;

}

if(mlockpatternutils.checkvoldpassword(keyguardupdatemonitor.getcurrentuser())){

//withoutthis,settingsisnotenableduntilthelockscreenfirstappears

setshowinglocked(false);

hidelocked();

mupdatemonitor.reportsuccessfulstrongauthunlockattempt();

return;

}

showlocked(options);

} 1、mexternallyenabled;默认为true，如果其它应用设置keyguard不显示，则直接return不显示;

2、如果keyguard当前正在显示，则不用管它，重置;

3、如果安装向导未执行完毕，即设备未完成初始化绑定等操作，也不去显示keyguard;

4、如果当前屏幕为灭屏状态，也不去显示keyguard;

5、without this, settings is not enabled until the lock screen first appears(我这边没有比较好的说法);

6、如果上述条件都不满足则使用showlocked()方法开始显示keyguard。

发送msg为show的消息，开始显示keyguard;

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/**

*sendmessagetokeyguardtellingittoshowitself

*@see#handleshow

*/

privatevoidshowlocked(bundleoptions){

if(debug)log.d(tag,"showlocked");

//ensurewestayawakeuntilwearefinisheddisplayingthekeyguard

mshowkeyguardwakelock.acquire();

messagemsg=mhandler.obtainmessage(show,options);

mhandler.sendmessage(msg);

} 调用handleshow()方法;

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caseshow:

handleshow((bundle)msg.obj);

break; 在handleshow()方法中调用statusbarkeyguardviewmanager.java的show()方法;

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/**

*handlemessagesentby{@link#showlocked}.

*@see#show

*/

privatevoidhandleshow(bundleoptions){

synchronized(keyguardviewmediator.this){

if(!msystemready){

if(debug)log.d(tag,"ignoringhandleshowbecausesystemisnotready.");

return;

}else{

if(debug)log.d(tag,"handleshow");

}

setshowinglocked(true);

mstatusbarkeyguardviewmanager.show(options);

mhiding=false;

mwakeandunlocking=false;

resetkeyguarddonependinglocked();

mhideanimationrun=false;

updateactivitylockscreenstate();

adjuststatusbarlocked();

useractivity();

mshowkeyguardwakelock.release();

}

mkeyguarddisplaymanager.show();

} 调入到statusbarkeyguardviewmanager.java的show()方法

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publicvoidshow(bundleoptions){

mshowing=true;

mstatusbarwindowmanager.setkeyguardshowing(true);

mscrimcontroller.abortkeyguardfadingout();

reset();

} statusbarkeyguardviewmanager.java负责keyguard在status bar中创建、显示、隐藏、重置

statusbarwindowmanager.java负责所有的status bar窗口状态的逻辑管理

1、statusbarkeyguardviewmanager.java的setkeyguardshowing()方法去使用apply()方法刷新mstatusbarview的flag参数;

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publicvoidsetkeyguardshowing(booleanshowing){

mcurrentstate.keyguardshowing=showing;

apply(mcurrentstate);

} 2、调用reset()方法去重置mstatusbarview的state，先来看reset()方法;

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/**

*resetthestateoftheview.

*/

publicvoidreset(){

if(mshowing){

if(moccluded){

mphonestatusbar.hidekeyguard();

mphonestatusbar.stopwaitingforkeyguardexit();

mbouncer.hide(false/*destroyview*/);

}else{

showbouncerorkeyguard();

}

keyguardupdatemonitor.getinstance(mcontext).sendkeyguardreset();

updatestates();

}

} 在reset()方法中会去判断keyguard是否被其它的窗口中断moccluded，是则不显示keyguard;否则的就执行showbouncerorkeyguard()方法;

showbouncerorkeyguard()方法使用keyguardbouncer.java的needsfullscreenbouncer()方法判断显示常规锁屏还是bouncer安全锁屏(比如图案锁屏、密码锁屏、pin码锁屏等);

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/**

*showsthenotificationkeyguardorthebouncerdependingon

*{@linkkeyguardbouncer#needsfullscreenbouncer()}.

*/

privatevoidshowbouncerorkeyguard(){

if(mbouncer.needsfullscreenbouncer()){

//thekeyguardmightbeshowing(already).soweneedtohideit.

mphonestatusbar.hidekeyguard();

mbouncer.show(true/*resetsecurityselection*/);

}else{

mphonestatusbar.showkeyguard();

mbouncer.hide(false/*destroyview*/);

mbouncer.prepare();

}

} 1、常规锁屏即为滑动锁屏界面，一般滑动即可解锁，称之为notification keyguard;这个类型的keyguard已经和statusbar融为一体了，可以通过phonestatusbar.java的对象直接进行控制;

2、bouncer安全锁屏;比如密码、图案、pim码、puk码等锁屏方式的锁屏界面，通过keyguardbouncer.java来开始控制show()和hide();

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keyguardbouncer.java的show()方法：

publicvoidshow(booleanresetsecurityselection){

ensureview();

if(resetsecurityselection){

//showprimarysecurityscreen()updatesthecurrentsecuritymethod.thisisneededin

//casewearealreadyshowingandthecurrentsecuritymethodchanged.

mkeyguardview.showprimarysecurityscreen();

}

if(mroot.getvisibility()==view.visible||mshowingsoon){

return;

}

//trytodismissthekeyguard.ifnosecuritypatternisset,thiswilldismissthewhole

//keyguard.ifweneedtoauthenticate,showthebouncer.

if(!mkeyguardview.dismiss()){

mshowingsoon=true;

//splituptheworkovermultipleframes.

dejankutils.postaftertraversal(mshowrunnable);

}

} 1、首先调用ensureview()方法去加载keyguard_bouncer view

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privatevoidensureview(){

if(mroot==null){

inflateview();

}

}

privatevoidinflateview(){

removeview();

mroot=(viewgroup)layoutinflater.from(mcontext).inflate(r.layout.keyguard_bouncer,null);

mkeyguardview=(keyguardhostview)mroot.findviewbyid(r.id.keyguard_host_view);

mkeyguardview.setlockpatternutils(mlockpatternutils);

mkeyguardview.setviewmediatorcallback(mcallback);

mcontainer.addview(mroot,mcontainer.getchildcount());

mroot.setvisibility(view.invisible);

mroot.setsystemuivisibility(view.status_bar_disable_home);

} 2、调用keyguardhostview.java的showprimarysecurityscreen()方法;

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/**

*calledwhentheviewneedstobeshown.

*/

publicvoidshowprimarysecurityscreen(){

if(debug)log.d(tag,"show()");

msecuritycontainer.showprimarysecurityscreen(false);

} 继续调用keyguardsecuritycontainer.java的showprimarysecurityscreen()方法，先去获取锁屏方式;

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/**

*showstheprimarysecurityscreenfortheuser.thiswillbeeitherthemulti-selector

*ortheuser'ssecuritymethod.

*@paramturningofftrueifthedeviceisbeingturnedoff

*/

voidshowprimarysecurityscreen(booleanturningoff){

securitymodesecuritymode=msecuritymodel.getsecuritymode();

if(debug)log.v(tag,"showprimarysecurityscreen(turningoff="+turningoff+")");

showsecurityscreen(securitymode);

} 继续往下将获取到的锁屏方式securitymode作为参数调用showsecurityscreen()方法;这个方法主要是用来根据securitymode显示锁屏view的。

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/**

*switchestothegivensecurityviewunlessit'salreadybeingshown,inwhichcase

*thisisano-op.

*

*@paramsecuritymode

*/

privatevoidshowsecurityscreen(securitymodesecuritymode){

if(debug)log.d(tag,"showsecurityscreen("+securitymode+")");

if(securitymode==mcurrentsecurityselection)return;

keyguardsecurityviewoldview=getsecurityview(mcurrentsecurityselection);

keyguardsecurityviewnewview=getsecurityview(securitymode);

//emulateactivitylifecycle

if(oldview!=null){

oldview.onpause();

oldview.setkeyguardcallback(mnullcallback);//ignorerequestsfromoldview

}

if(securitymode!=securitymode.none){

newview.onresume(keyguardsecurityview.view_revealed);

newview.setkeyguardcallback(mcallback);

}

//findandshowthischild.

finalintchildcount=msecurityviewflipper.getchildcount();

finalintsecurityviewidformode=getsecurityviewidformode(securitymode);

for(inti=0;i if(msecurityviewflipper.getchildat(i).getid()==securityviewidformode){

msecurityviewflipper.setdisplayedchild(i);

break;

}

}

mcurrentsecurityselection=securitymode;

msecuritycallback.onsecuritymodechanged(securitymode,

securitymode!=securitymode.none&&newview.needsinput());

} 1、首先判断传入进来的securitymode是否已经被显示;

2、调用getsecurityview()方法获取给定的锁屏view;

3、调用keyguardsecurityview.java的onpause()方法暂停显示旧锁屏view，onresume()方法开始显示新的锁屏view;keyguardsecurityview.java是一个接口类，其内部方法都是抽象的只有声明没有实现，其方法实现都是在继承于这个接口的类中。

而在keyguard中主要是keyguardabskeyinputview.java、keyguardpasswordview.java、keyguardpatternview.java等等这些类继承于此接口实现其内部方法，这些类就是具体的锁屏界面view显示;

开机显示keyguard的总结：

1、在keyguardviewmediator.java的onsystemready()方法内调用dokeyguardlocked()开始锁屏加载流程;

2、setkeyguardenabled();其他应用程序或者服务可以调用setkeyguardenabled()方法请求禁止锁屏;

3、keyguardviewmediator.java在keyguard中起着主要调度的作用，主要负责

1)查询锁屏状态，当前是锁屏还是解锁状态;在锁屏状态下，会限制输入事件。

2)phonewindowmanager.java通过mkeyguarddelegate对象(keyguardservicedelegate.java)来使能keyguardviewmediator.java，调用其中的方法;

3)响应sim卡状态变化并对锁屏界面做相应的调整onsimstatechanged();

4、判断keyguard是否被禁止、keyguard当前是否正在显示等等即当前是否可以显示keguard，可以显示的话继续调用showlocked()方法;

5、调用handleshow()方法，调用statusbarkeyguardviewmanager.java的show()开始显示keyguard锁屏界面;

6、调用reset()方法，调用showbouncerorkeyguard()方法判断是显示正常锁屏界面还是安全锁屏界面;显示正常锁屏的话直接调用phonestatusbar.java的showkeyguard()或者hidekeyguard()方法;如果显示安全锁屏界面的话则调入keyguardbouncer.java类内;

7、调用keyguardbouncer.java的show()方法;使用ensureview()方法去加载实例化布局;调用keyguardhostview.java的showprimarysecurityscreen()方法去显示安全锁屏界面;

8、keyguardhostview.java的showprimarysecurityscreen()方法会调入到keyguardsecuritycontainer.java的showprimarysecurityscreen()方法中来;

9、调用showsecurityscreen()方法，根据锁屏方式来加载不同的锁屏view;

10、keyguardsecurityview.java是一个接口类，其内部方法都是抽象的只有声明没有实现，其方法实现都是在继承于这个接口的类中。

而在keyguard中主要是keyguardabskeyinputview.java、keyguardpasswordview.java、keyguardpatternview.java等等keyguard*view.java这些类继承于此接口实现其内部方法，这些类就是具体的锁屏界面view显示;

系统灭屏screen off之后的keguard加载流程：

android系统中的自动灭屏跟power按键之后灭屏流程可能有点区别，但是由于主要是分析灭屏之后keyguard加载，所以只需要关心keguard在系统灭屏之后的加载流程。

这里以按power键灭屏为例，分析其流程：

当亮屏状态下power键按下之后，经过一系列的判断之后会调用mpowermanager.gotosleep()方法，即通过aidl调用到powermanagerservice.java的gotosleep()方法：

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@override//bindercall

publicvoidgotosleep(longeventtime,intreason,intflags){

if(eventtime>systemclock.uptimemillis()){

thrownewillegalargumentexception("eventtimemustnotbeinthefuture");

}

mcontext.enforcecallingorselfpermission(

android.manifest.permission.device_power,null);

finalintuid=binder.getcallinguid();

finallongident=binder.clearcallingidentity();

try{

gotosleepinternal(eventtime,reason,flags,uid);

}finally{

binder.restorecallingidentity(ident);

}

} 继续调用gotosleepinternal()方法：

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privatevoidgotosleepinternal(longeventtime,intreason,intflags,intuid){

synchronized(mlock){

if(gotosleepnoupdatelocked(eventtime,reason,flags,uid)){

updatepowerstatelocked();

}

}

} 调用updatepowerstatelocked()方法，在这个方法内又去调用finishwakefulnesschangeifneededlocked()方法

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privatevoidfinishwakefulnesschangeifneededlocked(){

if(mwakefulnesschanging&&mdisplayready){

if(mwakefulness==wakefulness_dozing

&&(mwakelocksummary&wake_lock_doze)==0){

return;//waituntildreamhasenableddozing

}

mwakefulnesschanging=false;

mnotifier.onwakefulnesschangefinished();

}

} 此时调用notifier.java的onwakefulnesschangefinished()方法：

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/**

*notifiesthatthedevicehasfinishedchangingwakefulness.

*/

publicvoidonwakefulnesschangefinished(){

if(debug){

slog.d(tag,"onwakefulnesschangefinished");

}

if(minteractivechanging){

minteractivechanging=false;

handlelateinteractivechange();

}

} 调用handlelateinteractivechange()方法;

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/**

*handlelateinteractivestatechangesoncetheyarefinishedsothatthesystemcan

*finishpendingtransitions(suchasturningthescreenoff)beforecausing

*applicationstochangestatevisibly.

*/

privatevoidhandlelateinteractivechange(){

synchronized(mlock){

if(minteractive){

//finishedwakingup...

mhandler.post(newrunnable(){

@override

publicvoidrun(){

mpolicy.finishedwakingup();

}

});

}else{

//finishedgoingtosleep...

//thisisagoodtimetomaketransitionsthatwedon'twanttheusertosee,

//suchasbringingthekeyguardtofocus.there'snoguaranteeforthis

//howeverbecausetheusercouldturnthedeviceonagainatanytime.

//somethingsmayneedtobeprotectedbyothermechanismsthatdeferscreenon.

//cancelpendinguseractivity.

if(museractivitypending){

museractivitypending=false;

mhandler.removemessages(msg_user_activity);

}

//tellthepolicywefinishedgoingtosleep.

finalintwhy=translateoffreason(minteractivechangereason);

mhandler.post(newrunnable(){

@override

publicvoidrun(){

eventlog.writeevent(eventlogtags.power_screen_state,0,why,0,0);

mpolicy.finishedgoingtosleep(why);

}

});

//sendnon-interactivebroadcast.

mpendinginteractivestate=interactive_state_asleep;

mpendinggotosleepbroadcast=true;

updatependingbroadcastlocked();

}

}

} 这个方法里面需要关注的有两句话：mpolicy.finishedwakingup()和mpolicy.finishedgoingtosleep();看其中的注释发现一个是唤醒另外一个是睡眠操作，由于当前是power灭屏，所以需要看得是mpolicy.finishedgoingtosleep()方法。而mpolicy是windowmanagerpolicy.java的对象，这个类又是一个接口类，接口实现是在phonewindowmanager.java类中，故此时调入到phonewindowmanager.java的finishedgoingtosleep()方法;

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//calledonthepowermanager'snotifierthread.

@override

publicvoidfinishedgoingtosleep(intwhy){

eventlog.writeevent(70000,0);

if(debug_wakeup)slog.i(tag,"finishedgoingtosleep...(why="+why+")");

metricslogger.histogram(mcontext,"screen_timeout",mlockscreentimeout/1000);

//wemustgetthisworkdoneherebecausethepowermanagerwilldrop

//thewakelockandletthesystemsuspendoncethisfunctionreturns.

synchronized(mlock){

mawake=false;

updatewakegesturelistenerlp();

updateorientationlistenerlp();

updatelockscreentimeout();

}

if(mkeyguarddelegate!=null){

mkeyguarddelegate.onfinishedgoingtosleep(why);

}

} 分析这个方法看到这么一句话：

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mkeyguarddelegate.onfinishedgoingtosleep(why); 也就是说会调用keyguardservicedelegate.java的onfinishedgoingtosleep()方法;而在上面的分析过程中知道，phonewindowmanager.java通过mkeyguarddelegate对象(keyguardservicedelegate.java)来使能keyguardviewmediator.java，调用其中的方法;也就是说通过这句话此时逻辑已经调入到了keyguardviewmediator.java类的onfinishedgoingtosleep()方法。

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publicvoidonfinishedgoingtosleep(intwhy){

if(debug)log.d(tag,"onfinishedgoingtosleep("+why+")");

synchronized(this){

mdeviceinteractive=false;

mgoingtosleep=false;

resetkeyguarddonependinglocked();

mhideanimationrun=false;

notifyfinishedgoingtosleep();

if(mpendingreset){

resetstatelocked();

mpendingreset=false;

}

if(mpendinglock){

dokeyguardlocked(null);

mpendinglock=false;

}

}

keyguardupdatemonitor.getinstance(mcontext).dispatchfinishedgoingtosleep(why);

}

在这个方法中调用notifyfinishedgoingtosleep()方法，向mhandler中发送一个msg为notify_finished_going_to_sleep的消息;

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privatevoidnotifyfinishedgoingtosleep(){

if(debug)log.d(tag,"notifyfinishedgoingtosleep");

mhandler.sendemptymessage(notify_finished_going_to_sleep);

} mhandler收到这个消息后，去调用handlenotifyfinishedgoingtosleep()方法;

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casenotify_finished_going_to_sleep:

handlenotifyfinishedgoingtosleep();

break; 在这个方法中去调用statusbarkeyguardviewmanager.java的onfinishedgoingtosleep()方法;

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privatevoidhandlenotifyfinishedgoingtosleep(){

synchronized(keyguardviewmediator.this){

if(debug)log.d(tag,"handlenotifyfinishedgoingtosleep");

mstatusbarkeyguardviewmanager.onfinishedgoingtosleep();

}

} 再来看statusbarkeyguardviewmanager.java的onfinishedgoingtosleep()方法：

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publicvoidonfinishedgoingtosleep(){

mdeviceinteractive=false;

mphonestatusbar.onfinishedgoingtosleep();

mbouncer.onscreenturnedoff();

} 1、调用phonestatusbar.java的onfinishedgoingtosleep()，去通知phonestatusbar更新当前的状态;

2、进入keyguardbouncer.java的onscreenturnedoff()方法真正开始keyguard的加载;

接下来来看keyguardbouncer.java的onscreenturnedoff()方法：

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publicvoidonscreenturnedoff(){

if(mkeyguardview!=null&&mroot!=null&&mroot.getvisibility()==view.visible){

mkeyguardview.onpause();

}

} 调用keyguardhostview.java的onpause()方法：

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/**

*calledwhenthekeyguardisnotactivelyshownanymoreonthescreen.

*/

publicvoidonpause(){

if(debug)log.d(tag,string.format("screenoff,instance%sat%s",

integer.tohexstring(hashcode()),systemclock.uptimemillis()));

msecuritycontainer.showprimarysecurityscreen(true);

msecuritycontainer.onpause();

clearfocus();

} 继续调用keyguardsecuritycontainer.java的showprimarysecurityscreen()方法，根据上面的分析知道，此处先会去获取当前锁屏方式，然后根据得到的锁屏方式去加载锁屏界面;

至此完成keyguard在screen off状态下的加载流程分析;

正常灭屏显示keyguard流程总结：

1、不管是按power键还是自动灭屏，都会执行到powermanagerservice.java的gotosleep()方法;

2、在这个方法内通过一系列的调用，调入到phonewindowmanager.java的finishedgoingtosleep()方法;

3、在phonewindowmanager.java类中通过keyguardservicedelegate.java类的对象mkeyguarddelegate来使能keyguardviewmediator.java;

4、而keyguardviewmediator.java作为keyguard的调度者，从这里开始keyguard的加载;

5、最终在keyguardsecuritycontainer.java的showprimarysecurityscreen()方法内去实现根据锁屏方式加载锁屏界面;

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