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ANR原理及分析

ANR 基础知识

ANR(Application Not Responding)的监测原理本质上是消息机制,设定一个delay消息,超时未被移除则触发ANR。具体逻辑处理都在system server端,包括发送超时消息,移除超时消息,处理超时消息以及ANR弹框展示等;对于app而言,触发ANR的条件是主线程阻塞。

分类

很多情况下对应类型的ANR与正在执行的组件(ContentProvider、Broadcast、Service)本身没有关系。

  1. Service ANR:前台20s,后台200s;startForeground超时10s
  2. Broadcast ANR:前台10s,后台60s
  3. Input ANR:按键或触摸事件在5s内无响应
  4. ContentProvider ANR:10s,少见

常见原因

  1. 主线程binder耗时
  2. 主线程i/o耗时
  3. 死锁
  4. 主线程等锁耗时
  5. activity resume慢/焦点窗口切换慢(针对Input anr)
  6. 主线程有太多消息要执行,导致对应组件消息执行delay。
  7. 主线程前面的消息执行耗时,导致后面的消息delay。
  8. 跟手机当时状态有关,内存/cpu等
  9. startForeground未在Service的onStartCommand中执行

如何分析

步骤

  1. 确定anr的基本信息

先搜索am_anr 确定anr发生时间点、类型、超时、进程等。

03-04 13:45:03.781 1000 1199 14667 I am_anr : [0,2900,com.android.systemui,551042573,Input dispatching timed out (StatusBar, b49ba2b StatusBar (server) is not responding. Waited 8001ms for MotionEvent(action=DOWN))]

  1. 查看traces文件

查看/data/anr下的对应1中的进程和时间点的traces文件, 如果很明显主线程处于Blocked状态切utm/stm时间较长则可直接通过堆栈确认原因。

  1. 查看对应时间段的event log/ main log等

但是很多情况下并不能恰如其分抓到anr发生时的堆栈,所以还得通过其他log来确认原因。 搜索 “ANR in”往前时间点搜索pid 相关信息(在03-04 13:45:03.781 往前推8s时间内)

关键字眼

  1. Slow Operation /am_lifecycle_sample
  2. Slow Looper main
  3. Slow Binder /binder_sample
  4. dvm_lock_sample

常见实例

i/o耗时

io耗时导致110消息执行时间过长,导致Receiver消息迟迟得不到执行

06-30 15:11:11.411 1000 1895 8935 I am_anr :[0,5831,com.android.settings,952745541,Broadcast of Intent { act=android.hardware.usb.action.USB_STATE flg=0x31000010 cmp=com.android.settings/.connecteddevice.usb.UsbModeChooserReceiver(has extras) }]

06-30 15:11:16.453 1000 5831 5831 I am_lifecycle_sample: [0,com.android.settings,110,14998]
06-30 15:11:16.454 1000 5831 5831 W Looper : PerfMonitor longMsg :seq=2 plan=15:11:01.454 late=2ms wall=14998ms running=77ms runnable=55ms io=14144ms h=android.app.ActivityThread$H w=110 procState=2
06-30 15:11:16.469 1000 5831 5831 D UsbModeChooserReceiver: action = android.hardware.usb.action.USB_STATE

Service的startFrouground使用不当

startForeground一般需要在onStartCommand方法里调用,而不是在Service的onCreate中。因为如果你onStartCommand的返回值是START_NOT_STICKY,进程被杀后重启不会回调onCreate方法,但是还是会有还会走ANR的逻辑。

进程crash后不会立刻拉起Service,而是通过计算delay去启动,此处delay时间是6268ms,log中正好6s后才开始通过MxActivateService拉起短信进程

05-31 19:35:17.316 1760 8998 I am_proc_died: [0,27908,com.android.mms,200,4]
05-31 19:35:17.406 1760 8998 I am_schedule_service_restart [0,com.android.mms/com.xiaomi.mms.transaction.MxActivateService,6268]
05-31 19:35:23.812 1760 1823 I am_proc_start: [0,16206,10104,com.android.mms,service,\{com.android.mms/com.xiaomi.mms.transaction.MxActivateService}]
05-31 19:35:24.031 1760 3001 I am_proc_bound: [0,16206,com.android.mms]

startForeground ANR的超时时间是10s,计算时间起始点是system server端post app端去执行Service的onStartCommand时。如果在onStartCommand开始执行后10s内未调用startForeground方法就会发生ANR。

05-31 19:35:24.500 1760 16269 I am_anr : [0,16206,com.android.mms,952745573,Context.startForegroundService() did not then call Service.startForeground(): ServiceRecord{3201640 u0 com.android.mms/com.xiaomi.mms.transaction.MxActivateService}]

主线程等锁耗时

发生ANR的8s内,home主线程有等锁11s,导致input事件未被及时处理。

02-07 16:24:51.941 1000 1237 8731 I am_anr :[0,1855,com.miui.home,953794117,Input dispatching timed out (com.miui.home/com.miui.home.recents.settings.NavigationBarTypeActivity, 1d271ca com.miui.home/com.miui.home.recents.settings.NavigationBarTypeActivity (server) is not responding. Waited 8000ms for FocusEvent(hasFocus=false))]
02-07 16:24:52.566 10074 1855 1855 I dvm_lock_sample: [com.miui.home,1,main,11259,Launcher.java,7312,void com.miui.home.launcher.Launcher.bindAppsChanged(java.util.List, java.util.List, java.util.List),LauncherModel.java,1468,void com.miui.home.launcher.LauncherModel$LoaderTask.run(),100]

binder 耗时

app查询另一个进程的content provider,binder耗时5s多

06-25 16:30:49.584 1000 1894 16604 I am_anr :[0,6171,com.miui.cloudservice,818429509,Input dispatching timed out (com.miui.cloudservice/com.miui.cloudservice.ui.MiCloudMainActivity, 7cfa4a0 com.miui.cloudservice/com.miui.cloudservice.ui.MiCloudMainActivity(server) is not responding. Waited 5002ms for FocusEvent(hasFocus=false))]
06-25 16:30:49.872 10141 6171 6171 W BpBinder: PerfMonitor binderTransact : time = 5416ms interface=android.content.IContentProvider code=1
06-25 16:30:49.893 10141 6171 6171 W Activity: Slow Operation: Activity com.miui.cloudservice/.ui.ShareLocationProxyActivity onCreate took 5440ms

对端进程pid为7467,isLocked持锁5s多,导致isOpen等锁

outgoing transaction: from 6171: 6171 to 7467:14336 context:binder code: 1 duration: 5.12 s
06-25 16:30:49.871 9810 7467 14336 W aomi.finddevic: Long monitor contention with owner IntentService[FindDeviceAsyncControlService] (16551) at boolean com.xiaomi.finddevice.v2.FindDeviceStatusManagerInternal.isLocked(android.content.Context(FindDeviceStatusManagerInternal.java:85) waiters=1 in boolean com.xiaomi.finddevice.v2.FindDeviceStatusManagerInternal.isOpen() for 5.415s

activity resume慢/焦点窗口切换慢

09-18 18:22:46.380 system server端已经post app执行TransparentAliuserGuideActivity启动流程(onCreate、onStart、onResume)

09-18 18:22:46.368 1000 1775 8750 I wm_create_activity: [0,120134288,260,com.eg.android.AlipayGphone/com.ali.user.mobile.login.ui.TransparentAliuserGuideActivity,NULL,NULL,NULL,268435456]

09-18 18:22:46.379 1000 1775 8595 I wm_restart_activity: [0,120134288,260,com.eg.android.AlipayGphone/com.ali.user.mobile.login.ui.TransparentAliuserGuideActivity]

09-18 18:22:46.380 1000 1775 8595 I wm_set_resumed_activity [0,com.eg.android.AlipayGphone/com.ali.user.mobile.login.ui.TransparentAliuserGuideActivity,minimalResumeActivityLocked]

09-18 18:22:46.371 1000 1775 8750 I wm_pause_activity: [0,165346169,com.eg.android.AlipayGphone/.AlipayLogin,userLeaving=true]

09-18 18:22:46.377 10277 12968 12968 I wm_on_paused_called: [0,com.eg.android.AlipayGphone.AlipayLogin,performPause,2]

09-18 18:22:46.408 1000 1775 3123 I input_focus: Focus leaving 1c6356e com.eg.android.AlipayGphone/com.eg.android.AlipayGphone.AlipayLogin (server)

09-18 18:22:51.625 1000 1775 12690 I am_anr : [0,12968,com.eg.android.AlipayGphone,815283780,Input dispatching timed out (com.eg.android.AlipayGphone/com.eg.android.AlipayGphone.AlipayLogin, 1c6356e com.eg.android.AlipayGphone/com.eg.android.AlipayGphone.AlipayLogin (server) is not responding. Waited 5003ms for FocusEvent(hasFocus=false))]

在2021-09-18 18:22:52打印anr traces时(6s后),activity还在执行onCreate,app主线程resume慢

----- pid 12968 at 2021-09-18 18:22:52 -----
Cmd line: com.eg.android.AlipayGphone

"main" prio=5 tid=1 Waiting // 线程状态为等待

group="main" sCount=1 dsCount=0 flags=1 obj=0x71672ce0 self=0xf0ea2e00
sysTid=12968 nice=-10 cgrp=top-app sched=0/0 handle=0xf140c470
state=S schedstat=( 4746836080 2972071474 7431 ) utm=332 stm=142 core=7 HZ=100
stack=0xff661000-0xff663000 stackSize=8192KB
held mutexes=
at sun.misc.Unsafe.park(Native method)
waiting on an unknown object
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:190)
at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:450)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at com.ali.user.mobile.db.LoginHistoryLoader.getPreLoadLoginHistory(LoginHistoryLoader.java:100007)
at com.ali.user.mobile.login.ui.BaseLoginActivity.__onCreate_stub_private(BaseLoginActivity.java:100043)
at com.ali.user.mobile.login.ui.BaseLoginActivity.onCreate(BaseLoginActivity.java:-1)
at com.ali.user.mobile.login.ui.TransparentAliuserGuideActivity.__onCreate_stub_private(TransparentAliuserGuideActivity.java:100002) // TransparentAliuserGuideActivity执行onCreate
at com.ali.user.mobile.login.ui.TransparentAliuserGuideActivity.__onCreate_stub(TransparentAliuserGuideActivity.java:-1)
at com.alipay.dexaop.invokers.ANDROID_APP_ACTIVITY$ONCREATE$BODY_0$1.invokeMethod(ANDROID_APP_ACTIVITY$ONCREATE$BODY_0.java:100007)
at com.alipay.dexaop.DexAOPEntry.android_app_Activity_onCreate_proxy(DexAOPEntry.java:100019)
at com.ali.user.mobile.login.ui.TransparentAliuserGuideActivity.onCreate(TransparentAliuserGuideActivity.java:-1)
at android.app.Activity.performCreate(Activity.java:8143)
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复杂场景

app主线程等锁0x083a79bd处于Blocked状态

"main" prio=5 tid=1 Blocked //主线程状态为Blocked
  | group="main" sCount=1 dsCount=0 flags=1 obj=0x70d8db70 self=0xecabae00
  | sysTid=15494 nice=-10 cgrp=default sched=0/0 handle=0xed020470
  | state=S schedstat=( 391677894 98428857 812 ) utm=30 stm=8 core=4 HZ=100
  | stack=0xff64f000-0xff651000 stackSize=8192KB
  | held mutexes=
  at android.app.ActivityThread.acquireProvider(ActivityThread.java:7237)
  - waiting to lock <0x083a79bd> (a android.app.ActivityThread$ProviderKey) held by thread 59 // 等锁0x083a79bd
  at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2954)
  at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:2509)
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该锁0x083a79bd被Ad-SingleThread线程持有,且线程当前正在等待binder对端响应

"Ad-SingleThread" prio=5 tid=59 Native
  | group="main" sCount=1 dsCount=0 flags=1 obj=0x151c8298 self=0xcd7c2800
  | sysTid=15697 nice=0 cgrp=default sched=0/0 handle=0xb3be61c0
  | state=S schedstat=( 6271455 10639325 58 ) utm=0 stm=0 core=5 HZ=100
  | stack=0xb3ae3000-0xb3ae5000 stackSize=1040KB
  | held mutexes=
  native: #00 pc 0009b220  /apex/com.android.runtime/lib/bionic/libc.so (__ioctl+8)
  native: #01 pc 00069127  /apex/com.android.runtime/lib/bionic/libc.so (ioctl+26)
  native: #02 pc 00039f1b  /system/lib/libbinder.so (android::IPCThreadState::talkWithDriver(bool)+238)
  native: #03 pc 0003ab8b  /system/lib/libbinder.so (android::IPCThreadState::waitForResponse(android::Parcel*, int*)+86) // 等binder对端返回
  native: #04 pc 0003a92b  /system/lib/libbinder.so (android::IPCThreadState::transact(int, unsigned int, android::Parcel const&, android::Parcel*, unsigned int)+126)
  native: #05 pc 00035563  /system/lib/libbinder.so (android::BpBinder::transact(unsigned int, android::Parcel const&, android::Parcel*, unsigned int)+142)
  native: #06 pc 000cc93d  /system/lib/libandroid_runtime.so (android_os_BinderProxy_transact(_JNIEnv*, _jobject*, int, _jobject*, _jobject*, int)+216)
  at android.os.BinderProxy.transactNative(Native method)
  at android.os.BinderProxy.transact(BinderProxy.java:595)
  at android.app.IActivityManager$Stub$Proxy.getContentProvider(IActivityManager.java:6002) //跟AMS binder通信
  at android.app.ActivityThread.acquireProvider(ActivityThread.java:7264)
  - locked <0x006b0aac> (a android.app.ActivityThread$ProviderAcquiringCount)
  - locked <0x083a79bd> (a android.app.ActivityThread$ProviderKey) // 持锁0x083a79bd
  at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2954)
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查看traces中system server进程,搜索getContentProvider找到对应的binder线程

"Binder:1606_C" prio=5 tid=162 TimedWaiting //线程处于等待状态
  | group="main" sCount=1 dsCount=0 flags=1 obj=0x137a04b0 self=0xb4000071741c4000
  | sysTid=2842 nice=0 cgrp=default sched=0/0 handle=0x7160821cc0
  | state=S schedstat=( 159202795207 108681383188 879023 ) utm=10372 stm=5548 core=5 HZ=100 //utm为10s多,不正常
  | stack=0x716072a000-0x716072c000 stackSize=995KB
  | held mutexes=
  at java.lang.Object.wait(Native method)
  - waiting on <0x008a756c> (a com.android.server.am.ContentProviderRecord) // wait
  at java.lang.Object.wait(Object.java:442)
  at com.android.server.am.ActivityManagerService.getContentProviderImpl(ActivityManagerService.java:8014) 
  - locked <0x008a756c> (a com.android.server.am.ContentProviderRecord) //持锁0x008a756c
  at com.android.server.am.ActivityManagerService.getContentProvider(ActivityManagerService.java:8148) // binder线程执行getContentProvider
  at android.app.IActivityManager$Stub.onTransact(IActivityManager.java:2523)
  at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:3147)
  at android.os.Binder.execTransactInternal(Binder.java:1160)
  at android.os.Binder.execTransact(Binder.java:1129)
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查找AMS中上述堆栈对应代码 这段代码是在等待对应provider发布完成,如果provider所在进程未启动,则先拉起该进程;超时时间为20s。

// Wait for the provider to be published...
7991        final long timeout =
7992                SystemClock.uptimeMillis() + ContentResolver.CONTENT_PROVIDER_READY_TIMEOUT_MILLIS;
7993        boolean timedOut = false;
7994        synchronized (cpr) { // 持锁
                   .........
8007                try {
8008                    final long wait = Math.max(0L, timeout - SystemClock.uptimeMillis());
8012                    if (conn != null) {
8013                        conn.waiting = true;
8014                    }
8015                    cpr.wait(wait); // 在该锁上wait
8016                    if (cpr.provider == null) {
8017                        timedOut = true;
8018                        break;
8019                    }
8020                } catch (InterruptedException ex) {
8021             ......
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结合对应时间点的对端(Content Provider所在)进程的event log

06-23 21:00:05.484 1000 1606 1749 I am_proc_start [0,15287,1000,com.miui.securitycenter.remote,content provider,{com.miui.securitycenter/com.miui.idprovider.IdProvider}]
06-23 21:00:05.555 1000 1606 2891 I am_proc_bound: [0,15287,com.miui.securitycenter.remote] 06-23 21:00:05.656 1000 1606 2891 I am_kill : [0,15287,com.miui.securitycenter.remote,100,stop com.miui.securitycenter due to from process:com.miui.securitycenter.remote]
06-23 21:00:05.688 1000 1606 1748 I am_wtf : [0,6155,system_server,-1,ActivityManager,Timeout waiting for provider com.miui.securitycenter/1000 for provider com.miui.idprovider providerRunning=false caller=com.miui.systemAdSolution/10111]
06-23 21:00:16.592 10102 15899 15950 W BpBinder: PerfMonitor binderTransact : time=5464ms interface=android.app.IActivityManager code=22
06-23 21:00:16.591 10153 3966 4704 W BpBinder: PerfMonitor binderTransact : time=10529ms interface=android.app**.IActivityManager** code=22
06-23 21:00:16.592 10153 3966 4704 E ActivityThread: Failed to find provider info for com.miui.idprovider

综上:content provider拉起进程时,进程刚拉起尚未publish provider就被杀死,所以getContentProviderImpl 等待耗时,导致bindet耗时,app端子线程持锁耗时,主线程等锁耗时,从而发生ANR。

ANR 原理

Service ANR

system server在service的相关流程执行前会发送delay消息到main handler中,如果app段在对应delay消息内未通知system server段移除消息,则执行超时消息,触发anr。 SERVICE_TIMEOUT_MSG delay时间为前台service 20s,后台service 200s


void scheduleServiceTimeoutLocked(ProcessRecord proc) {
       if (proc.executingServices.size() == 0 || proc.thread == null) {
           return;
       }
       Message msg = mAm.mHandler.obtainMessage(
               ActivityManagerService.SERVICE_TIMEOUT_MSG);
       msg.obj = proc;
       mAm.mHandler.sendMessageDelayed(msg,
               proc.execServicesFg ? SERVICE_TIMEOUT : SERVICE_BACKGROUND_TIMEOUT);
   }
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service的anr主要总结为如下表格中的三个流程:

原因/流程ActiveServicesService超时时间
createrealStartServiceLockedonCreate20s/200s
startsendServiceArgsonStartCommand20s/200s
foregroundsendServiceArgsonStartCommand10s

创建service

发送delay消息

在ActiveService的realStartServiceLocked方法中发送delay消息,前台20s,后台200s;再去通知app端执行create service相关流程。

    private void realStartServiceLocked(ServiceRecord r, ProcessRecord app,
            IApplicationThread thread, int pid, UidRecord uidRecord, boolean execInFg,
            boolean enqueueOomAdj) throws RemoteException {
        ......
        // 先去发送delay消息
        bumpServiceExecutingLocked(r, execInFg, "create", null /* oomAdjReason */);
    .......
        boolean created = false;
        try {
           ......
           // 再binder通知app端去执行Service的onCreate
            thread.scheduleCreateService(r, r.serviceInfo,
                    mAm.compatibilityInfoForPackage(r.serviceInfo.applicationInfo),
                    app.mState.getReportedProcState());
            r.postNotification();
            created = true;
            .......
        } catch (DeadObjectException e) {
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在这里插入图片描述

移除delay消息

app端收到system server的binder回调scheduleCreateService后,发送消息到主线程的Handler,等到、Service的onCreate方法执行完后,通过binder serviceDoneExecuting告知system server执行完毕,移除MainHandler中相关的delay消息。

在这里插入图片描述

启动service

发送delay消息

system server在start service前post一个SERVICE_TIMEOUT_MSG delay消息到MainHandler, 对应system server的是sendServiceArgsLocked方法,对应app端的是onStartCommand方法。

startService时,若service存在,即已进被创建,则直接调用sendServiceArgsLocked方法,否则等service create之后再调用该方法。

    private final void sendServiceArgsLocked(ServiceRecord r, boolean execInFg,
            boolean oomAdjusted) throws TransactionTooLargeException {
        ArrayList<ServiceStartArgs> args = new ArrayList<>();

        while (r.pendingStarts.size() > 0) {
            ServiceRecord.StartItem si = r.pendingStarts.remove(0);
            .......
            // 发送start相关的超时消息
            bumpServiceExecutingLocked(r, execInFg, "start", null /* oomAdjReason */);
            if (r.fgRequired && !r.fgWaiting) {
                if (!r.isForeground) {
             		// 如果是前台service且isForeground未被赋值,则发送foreground相关的超时消息
                    scheduleServiceForegroundTransitionTimeoutLocked(r);
                } else {
                    r.fgRequired = false;
                }
            }
        .........
        try {
        // binder通知app执行onStartCommand相关流程
            r.app.getThread().scheduleServiceArgs(r, slice);
        } catch (TransactionTooLargeException e) {
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在这里插入图片描述

移除delay消息

app端收到system server的binder回调scheduleServiceArgs后,发送消息到主线程的Handler,等到相关消息被执行,Service的onStartCommand方法执行完后,通过binder serviceDoneExecuting告知system server执行完毕,移除MainHandler中相关的delay消息。 在这里插入图片描述

前台service调用startForeground超时

发送delay消息

调用startForegroundService 启动前台Service ,需要在onStartCommand调用前post 一个 delay 10sSERVICE_FOREGROUND_TIMEOUT_MSG消息到MainHandler中

如果客户端10s内未及时调用startForeground,则会 触发ANR 在这里插入图片描述

移除delay消息

客户端调用startForeground

Service.startForeground → AMS.setServiceForeground → ActiveServices.setServiceForegroundLocked → setServiceForegroundInnerLocked → MainHandler.removeMessages

执行超时消息,触发ANR

  • 若binder耗时(比较少见);
  • app主线程执行一些消息耗时导致service相关的消息得不到执行 ;
  • 或Service本身的周期方法onCreate,onStartCommand等执行一些耗时操作;

导致20s(前台service)或200s(后台service)或10s(startForeground)内app端未及时binder回调serviceDoneExecuting告知AMS,MainHandler则会执行到delay的消息,并调用appNotResponding方法,造成ANR现象。

MainHandler → ActiveServices.serviceTimeout(serviceForegroundTimeout) → ProcessRecord.appNotResponding

Broacast超时

  1. 发送delay消息

前台广播10s,后台广播60s

BroadcastHandler → BroadcastQueue . processNextBroadcast → processNextBroadcastLocked → setBroadcastTimeoutLocked →BroadcastHandler.sendMessageAtTime

  1. 移除delay消息

Binder → AMS.finishReceiver → BroadcastQueue.processNextBroadcastLocked → cancelBroadcastTimeoutLocked → BroadcastHandler.removeMessages

  1. 执行delay消息

BroadcastHandler → BroadcastQueue.broadcastTimeoutLocked → AppNotResponding.run → ProcessRecord.appNotResponding

ContentProvider超时

  1. 发送delay消息

Binder→ AMS.attachApplication → attachApplicationLocked → MainHandler.sendMessageDelayed

static final int CONTENT_PROVIDER_PUBLISH_TIMEOUT_MSG = 57;      
if (providers != null && checkAppInLaunchingProvidersLocked(app)) {
    Message msg = mHandler.obtainMessage(CONTENT_PROVIDER_PUBLISH_TIMEOUT_MSG);
    msg.obj = app;
    mHandler.sendMessageDelayed(msg, CONTENT_PROVIDER_PUBLISH_TIMEOUT);
}
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  1. 移除delay消息

Binder→ AMS.publishContentProviders → MainHandler.removeMessages

  1. 执行delay消息

直接杀死进程以及清理相关信息,不会弹ANR弹窗 MainHandler → processContentProviderPublishTimedOutLocked → cleanupAppInLaunchingProvidersLocked → ProcessList.removeProcessLocked

Input超时

void InputDispatcher::processNoFocusedWindowAnrLocked() {
    // Check if the application that we are waiting for is still focused.
    sp<InputApplicationHandle> focusedApplication =
            getValueByKey(mFocusedApplicationHandlesByDisplay, mAwaitedApplicationDisplayId);
    if (focusedApplication == nullptr ||
        focusedApplication->getApplicationToken() !=
                mAwaitedFocusedApplication->getApplicationToken()) {
        // Unexpected because we should have reset the ANR timer when focused application changed
        ALOGE("Waited for a focused window, but focused application has already changed to %s",
              focusedApplication->getName().c_str());
        return; // The focused application has changed.
    }
 
    const sp<InputWindowHandle>& focusedWindowHandle =
            getFocusedWindowHandleLocked(mAwaitedApplicationDisplayId);
    if (focusedWindowHandle != nullptr) {
        return; // We now have a focused window. No need for ANR.
    }
    onAnrLocked(mAwaitedFocusedApplication);
}
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上报堆栈如下:

inputDispatchingTimedOut:20657, ActivityManagerService (com.android.server.am)
inputDispatchingTimedOut:20309, ActivityManagerService$LocalService (com.android.server.am)
keyDispatchingTimedOut:6334, ActivityRecord (com.android.server.wm)
notifyANRInner:261, InputManagerCallback (com.android.server.wm)
notifyANR:179, InputManagerCallback (com.android.server.wm)
notifyANR:2300, InputManagerService (com.android.server.input)

notifyANR:535,InputDispatcher(inputflinger.dispatcher)
doNotifyAnrLockedInterruptible:4902,InputDispatcher(inputflinger.dispatcher)
onAnrLocked:4833,InputDispatcher(inputflinger.dispatcher)
processNoFocusedWindowAnrLocked:535,InputDispatcher(inputflinger.dispatcher)
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Android
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