AndroidANR：原理分析及解决办法-源码交易平台丞旭猿

@OverrideprotectedvoidonCreate(@NullableBundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_anr_test);// 这是Android提供线程休眠函数，与Thread.sleep()最大的区别是// 该使用该函数不会抛出InterruptedException异常。SystemClock.sleep(20*1000);}

cdD:\Android\AndroidSdk\platform-tools

adbpull/data/anr/traces.txt

-----pid23346at2017-11-0711:33:57--------->进程id和ANR产生时间Cmdline:com.sky.myjavatestBuildfingerprint:google/marlin/marlin:8.0.0/OPR3.170623.007/4286350:user/release-keysABI:arm64Buildtype:optimizedZygoteloadedclasses=4681postzygoteclasses=106Interntable:42675strong;137weakJNI:CheckJNIison;globals=526(plus22weak)Libraries:/system/lib64/libandroid.so/system/lib64/libcompiler_rt.so/system/lib64/libjavacrypto.so/system/lib64/libjnigraphics.so/system/lib64/libmedia_jni.so/system/lib64/libsoundpool.so/system/lib64/libwebviewchromium_loader.solibjavacore.solibopenjdk.so(9)Heap:22%free,1478KB/1896KB;21881objects---->内存使用情况..."main"prio=5tid=1Sleeping---->原因为Sleeping|group="main"sCount=1dsCount=0flags=1obj=0x733d0670self=0x74a4abea00|sysTid=23346nice=-10cgrp=defaultsched=0/0handle=0x74a91ab9b0|state=Sschedstat=(39146212882838177354)utm=33stm=4core=3HZ=100|stack=0x7fe6fac000-0x7fe6fae000stackSize=8MB|heldmutexes=atjava.lang.Thread.sleep(Nativemethod)-sleepingon<0x053fd2c2>(ajava.lang.Object)atjava.lang.Thread.sleep(Thread.java:373)-locked<0x053fd2c2>(ajava.lang.Object)atjava.lang.Thread.sleep(Thread.java:314)atandroid.os.SystemClock.sleep(SystemClock.java:122)atcom.sky.myjavatest.ANRTestActivity.onCreate(ANRTestActivity.java:20)---->产生ANR的包名以及具体行数atandroid.app.Activity.performCreate(Activity.java:6975)atandroid.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)atandroid.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)atandroid.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)atandroid.app.ActivityThread.-wrap11(ActivityThread.java:-1)atandroid.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)atandroid.os.Handler.dispatchMessage(Handler.java:105)atandroid.os.Looper.loop(Looper.java:164)atandroid.app.ActivityThread.main(ActivityThread.java:6541)atjava.lang.reflect.Method.invoke(Nativemethod)atcom.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

jstack{pid}

7266Test7267Jps

privatefinalvoidrealStartServiceLocked(ServiceRecordr,ProcessRecordapp,booleanexecInFg)throwsRemoteException{...//发送delay消息(SERVICE_TIMEOUT_MSG)bumpServiceExecutingLocked(r,execInFg,"create");try{...//最终执行服务的onCreate()方法app.thread.scheduleCreateService(r,r.serviceInfo,mAm.compatibilityInfoForPackageLocked(r.serviceInfo.applicationInfo),app.repProcState);}catch(DeadObjectExceptione){mAm.appDiedLocked(app);throwe;}finally{...}}

privatefinalvoidbumpServiceExecutingLocked(ServiceRecordr,booleanfg,Stringwhy){...scheduleServiceTimeoutLocked(r.app);}voidscheduleServiceTimeoutLocked(ProcessRecordproc){if(proc.executingServices.size()==0||proc.thread==null){return;}longnow=SystemClock.uptimeMillis();Messagemsg=mAm.mHandler.obtainMessage(ActivityManagerService.SERVICE_TIMEOUT_MSG);msg.obj=proc;//当超时后仍没有remove该SERVICE_TIMEOUT_MSG消息，则执行service Timeout流程mAm.mHandler.sendMessageAtTime(msg,proc.execServicesFg?(now+SERVICE_TIMEOUT):(now+SERVICE_BACKGROUND_TIMEOUT));}

privatevoidhandleCreateService(CreateServiceDatadata){...java.lang.ClassLoadercl=packageInfo.getClassLoader();Serviceservice=(Service)cl.loadClass(data.info.name).newInstance();...try{//创建ContextImpl对象ContextImplcontext=ContextImpl.createAppContext(this,packageInfo);context.setOuterContext(service);//创建Application对象Applicationapp=packageInfo.makeApplication(false,mInstrumentation);service.attach(context,this,data.info.name,data.token,app,ActivityManagerNative.getDefault());//调用服务onCreate()方法service.onCreate();//取消AMS.MainHandler的延时消息ActivityManagerNative.getDefault().serviceDoneExecuting(data.token,SERVICE_DONE_EXECUTING_ANON,0,0);}catch(Exceptione){...}}

privatevoidserviceDoneExecutingLocked(ServiceRecordr,booleaninDestroying,booleanfinishing){...if(r.executeNesting<=0){if(r.app!=null){r.app.execServicesFg=false;r.app.executingServices.remove(r);if(r.app.executingServices.size()==0){//当前服务所在进程中没有正在执行的servicemAm.mHandler.removeMessages(ActivityManagerService.SERVICE_TIMEOUT_MSG,r.app);...}...}

finalvoidprocessNextBroadcast(booleanfromMsg){synchronized(mService){...// 处理当前有序广播do{r=mOrderedBroadcasts.get(0);//获取所有该广播所有的接收者intnumReceivers=(r.receivers!=null)?r.receivers.size():0;if(mService.mProcessesReady&&r.dispatchTime>0){longnow=SystemClock.uptimeMillis();if((numReceivers>0)&&(now>r.dispatchTime+(2*mTimeoutPeriod*numReceivers))){//step 1\. 发送延时消息，这个函数处理了很多事情，比如广播处理超时结束广播broadcastTimeoutLocked(false);...}}if(r.receivers==null||r.nextReceiver>=numReceivers||r.resultAbort||forceReceive){if(r.resultTo!=null){//2\. 处理广播消息消息performReceiveLocked(r.callerApp,r.resultTo,newIntent(r.intent),r.resultCode,r.resultData,r.resultExtras,false,false,r.userId);r.resultTo=null;}//3\. 取消广播超时ANR消息cancelBroadcastTimeoutLocked();}}while(r==null);...// 获取下条有序广播r.receiverTime=SystemClock.uptimeMillis();if(!mPendingBroadcastTimeoutMessage){longtimeoutTime=r.receiverTime+mTimeoutPeriod;//设置广播超时setBroadcastTimeoutLocked(timeoutTime);}...}}

finalvoidbroadcastTimeoutLocked(booleanfromMsg){...longnow=SystemClock.uptimeMillis();if(fromMsg){if(mService.mDidDexOpt){// Delay timeouts until dexopt finishes.mService.mDidDexOpt=false;longtimeoutTime=SystemClock.uptimeMillis()+mTimeoutPeriod;setBroadcastTimeoutLocked(timeoutTime);return;}if(!mService.mProcessesReady){return;}longtimeoutTime=r.receiverTime+mTimeoutPeriod;if(timeoutTime>now){// step 2setBroadcastTimeoutLocked(timeoutTime);return;}}

finalvoidsetBroadcastTimeoutLocked(longtimeoutTime){if(!mPendingBroadcastTimeoutMessage){Messagemsg=mHandler.obtainMessage(BROADCAST_TIMEOUT_MSG,this);mHandler.sendMessageAtTime(msg,timeoutTime);mPendingBroadcastTimeoutMessage=true;}}

longtimeoutTime=SystemClock.uptimeMillis()+mTimeoutPeriod;

publicActivityManagerService(ContextsystemContext){...staticfinalintBROADCAST_FG_TIMEOUT=10*1000;staticfinalintBROADCAST_BG_TIMEOUT=60*1000;...mFgBroadcastQueue=newBroadcastQueue(this,mHandler,"foreground",BROADCAST_FG_TIMEOUT,false);mBgBroadcastQueue=newBroadcastQueue(this,mHandler,"background",BROADCAST_BG_TIMEOUT,true);...}

finalvoidcancelBroadcastTimeoutLocked(){if(mPendingBroadcastTimeoutMessage){mHandler.removeMessages(BROADCAST_TIMEOUT_MSG,this);mPendingBroadcastTimeoutMessage=false;}}