Android 系统稳定性之ANR

相信大部分Android 开发人员都遇到过ANR问题，本文根据一些实际的开发经历介绍一下如何解决和避免ANR问题。

一，何为ANR

ANR是“Application Not Responding”的缩写，即“应用程序无响应”。在Android中，ActivityManagerService（简称AMS）和WindowManagerService

（简称WMS）会监测应用程序的响应时间，如果应用程序主线程（即UI线程）在超时时间内对输入事件没有处理完毕，或者对特定操作没有执行完毕，就会出现ANR。对于输入事件没有处理完毕产生的ANR，Android会显示一个对话框，提示用户当前应用程序没有响应，用户可以选择继续等待或者关闭这个应用程序（也就是杀掉这个应用程序的进程）。

产生ANR的原因：

主线程对输入事件在5秒内没有处理完毕
主线程在执行BroadcastReceiver的onReceive函数时10秒内没有执行完毕
主线程在执行Service的各个生命周期函数时20秒内没有执行完毕

由于广播接收器和Service都是无界面的，在上述三种ANR事件中只有1有界面提示，其他两种只输出日志。三种ANR均会输出log日志，同时还会将各个应用程序进程的函数堆栈输出到/data/data/anr/trace.txt中，这个文件是分析ANR原因的关键文件。

二，如何分析ANR

在Android测试工具Monkey博文中介绍了通过Monkey工具可以发现一些潜在的ANR风险，这里将介绍一旦出现ANR异常如何来分析。log和trace.txt就是两个利器。老规矩，还是先贴个例子上来分析。

log 信息分析：

:Sending Flip keyboardOpen=true:Sending Touch (ACTION_DOWN): 0:(24.0,570.0)    //[calendar_time:2014-08-16 12:44:38.403  system_uptime:263794]    // Sending event #3300:Sending Touch (ACTION_UP): 0:(51.368206,570.24054):Switch: #Intent;action=android.intent.action.MAIN;category=android.intent.category.LAUNCHER;launchFlags=0x10200000;component=com.hybroad.launcher/.activity.PreLauncherActivity;end    // Allowing start of Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.hybroad.launcher/.activity.PreLauncherActivity } in package com.hybroad.launcher:Sending Touch (ACTION_DOWN): 0:(1101.0,1020.0):Sending Touch (ACTION_UP): 0:(1165.5239,1050.6898)[  183.601062] RTL871X: survey done event(2)    // Rejecting start of Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] cmp=android/com.android.internal.app.ResolverActivity } in package android:Sending Touch (ACTION_DOWN): 0:(1672.0,963.0):Sending Touch (ACTION_UP): 0:(1607.745,971.0462) // NOT RESPONDING: com.hybroad.launcher (pid 6012) // com.hybroad.lanucher 出现了ANR，由SubMenuActivity里的操作导致的 ANR in com.hybroad.launcher (com.hybroad.launcher/.activity.SubMenuActivity)// ANR 原因是keyDispatching 超时，UI线程超5秒未响应 Reason: keyDispatchingTimedOutLoad: 3.97 / 2.2 / 0.93// 下面是CPU使用率，system_server 占用CPU过多，ago表示发生ANR之前的CPU使用情况。//later 是ANR之后CPU使用情况 CPU usage from 6313ms to 101ms ago:  98% 1375/system_server: 52% user + 45% kernel / faults: 2239 minor  75% 1630/com.hybroad.phone_remote: 39% user + 35% kernel / faults: 131 minor  68% 2385/com.hybroad.airplay: 40% user + 28% kernel / faults: 17 minor  18% 1035/tvos: 9.3% user + 9.1% kernel  18% 6012/com.hybroad.launcher: 13% user + 5.3% kernel / faults: 3363 minor 5 major  5.6% 1019/surfaceflinger: 2% user + 3.5% kernel  2.5% 5657/mediaserver: 0.3% user + 2.2% kernel / faults: 18 minor  0.6% 1608/com.hybroad.inputmethod.remote: 0.6% user + 0% kernel / faults: 1 minor  0.6% 4772/com.android.commands.monkey: 0.3% user + 0.3% kernel / faults: 24 minor  0.3% 1029/livecap: 0% user + 0.3% kernel  0.3% 2255/RTW_CMD_THREAD: 0% user + 0.3% kernel  0.1% 5/kworker/u:0: 0% user + 0.1% kernel  0.1% 22/kworker/u:1: 0% user + 0.1% kernel  0.1% 420/cifs_mem_clear: 0.1% user + 0% kernel  0.1% 1812/mdnsd: 0% user + 0.1% kernel / faults: 1 minor  0% 2244/rel_supplicant: 0% user + 0% kernel / faults: 51 minor 3 major49% TOTAL: 27% user + 21% kernel + 0% softirqCPU usage from 681ms to 1214ms later:  67% 1375/system_server: 37% user + 30% kernel / faults: 23 minor    7.5% 1728/Binder_7: 5.6% user + 1.8% kernel    5.6% 1688/Binder_3: 3.7% user + 1.8% kernel    5.6% 1689/Binder_4: 1.8% user + 3.7% kernel    5.6% 1729/Binder_8: 3.7% user + 1.8% kernel    5.6% 1899/Binder_A: 3.7% user + 1.8% kernel    3.7% 1375/system_server: 1.8% user + 1.8% kernel    3.7% 1386/Binder_1: 3.7% user + 0% kernel    3.7% 1387/Binder_2: 1.8% user + 1.8% kernel    3.7% 1397/ActivityManager: 0% user + 3.7% kernel    3.7% 1714/Binder_5: 1.8% user + 1.8% kernel    3.7% 1715/Binder_6: 3.7% user + 0% kernel    3.7% 1730/Binder_9: 1.8% user + 1.8% kernel    3.7% 1900/Binder_B: 3.7% user + 0% kernel  33% 1630/com.hybroad.phone_remote: 24% user + 9.4% kernel / faults: 1 minor    30% 1813/Timer-0: 22% user + 7.5% kernel  16% 1035/tvos: 3.7% user + 13% kernel    3.7% 1369/1035keypad Inpu: 1.8% user + 1.8% kernel    3.7% 1414/HDMITx_Task: 3.7% user + 0% kernel    3.7% 1700/Mdebug Monitor: 0% user + 3.7% kernel    1.8% 1406/Picture Monitor: 0% user + 1.8% kernel    1.8% 1698/Internal_MHLthr: 0% user + 1.8% kernel  3.7% 1019/surfaceflinger: 0% user + 3.7% kernel    3.7% 1186/SurfaceFlinger: 0% user + 3.7% kernel  3.7% 2385/com.hybroad.airplay: 3.7% user + 0% kernel    3.7% 2402/Timer-0: 3.7% user + 0% kernel33% TOTAL: 17% user + 15% kernelprocrank:  PID      Vss      Rss      Pss      Uss  cmdline 1375   70196K   69848K   47811K   44824K  system_server 1515   66980K   64488K   43472K   40784K  com.android.systemui 6012   55568K   43604K   23783K   21476K  com.hybroad.launcher 1035   56792K   18508K   17888K   17580K  /applications/bin/tvos 1630   31496K   31412K   13415K   12060K  com.hybroad.phone_remote 1020   37196K   37072K   10593K    5184K  zygote 5511   39404K   28252K    9760K    7964K  com.android.systemui:screenshot 4772   22584K   22556K    9660K    6436K  com.android.commands.monkey 1954   24868K   24780K    6770K    5188K  com.miui.mihome2 1921   23480K   23388K    6647K    5312K  com.miui.mihome.lockscreen 5657   10796K   10792K    6327K    5164K  /system/bin/mediaserver 1532   22468K   22380K    5764K    4708K  android.process.media 1660   24420K   24344K    5759K    4224K  system:ui 1560   23100K   23004K    5574K    4172K  com.miui.mihome2:download 1641   21048K   20948K    4481K    3524K  com.jrm.servicecontainer 1608   20764K   20680K    4463K    3532K  com.hybroad.inputmethod.remote 2385   18860K   18764K    3807K    3048K  com.hybroad.airplay 1019   46628K    7604K    3380K    2328K  /system/bin/surfaceflinger 1778   18440K   18348K    3262K    2504K  com.hybroad.dlna 1574   18404K   18296K    3024K    2200K  com.mstar.android.providers.tv 1794   17868K   17772K    2728K    1812K  com.hybroad.phone_remote.daemon 1820   17444K   17344K    2621K    1868K  org.opencv.engine:OpenCVEngineProcess 1652   17396K   17296K    2531K    1772K  com.broadcom.bluetoothmonitor 1871   16808K   16712K    2434K    1708K  com.android.settings 2035   16416K   16312K    2223K    1500K  com.jrm.localmm 1018    2440K    2440K    2101K    2088K  /system/bin/debuggerd 1905   16432K   16332K    2095K    1388K  com.android.onetimeinitializer 2426   16104K   16004K    2064K    1356K  com.mstar.tvsetting 1029    5072K    5072K    1818K    1260K  /system/bin/livecap 1021    4372K    4372K    1490K    1024K  /system/bin/drmserver 6274    1652K    1652K    1410K    1404K  procrank 1028    1252K    1252K     975K     968K  /system/bin/upnp_tv_receiver 2244    1892K    1892K     955K     832K  rel_supplicant 1027   22020K    2180K     788K     316K  /system/bin/virtualkeypad 1017    1612K    1612K     744K     644K  /system/bin/netd 1015    1508K    1508K     679K     596K  /system/bin/vold 1812     848K     848K     553K     544K  /system/bin/mdnsd    1     536K     536K     450K     388K  /init 1024    1228K    1228K     435K     360K  /system/bin/keystore 2242     356K     356K     356K     356K  /system/bin/busybox 1016     928K     928K     355K     316K  /system/bin/resourcemanager 1031     716K     716K     226K     208K  /system/bin/browserserver 2905     488K     488K     205K     128K  sh 1036     476K     476K     197K     120K  /system/bin/sh 2091     504K     504K     187K     176K  /system/bin/dhcpcd 1023     456K     456K     162K     152K  /system/bin/installd  674     220K     220K     154K      92K  /sbin/ueventd 1037     168K     168K     148K     148K  /sbin/adbd 6216     432K     428K     147K     132K  /system/bin/dnssd 1014     348K     344K     109K     104K  /system/bin/servicemanager 1026     348K     344K     105K     100K  /system/bin/logwrapper 1034     332K     332K      94K      88K  /system/bin/dnssd_daemon                          ------   ------  ------                         267207K  226160K  TOTAL

再看trace文件，只载录部分：

----- pid 6012 at 2014-08-16 12:44:43 -----Cmd line: com.hybroad.launcher//开头显示进程号、ANR发生的时间点和进程名称JNI: CheckJNI is off; workarounds are off; pins=0; globals=159DALVIK THREADS:(mutexes: tll=0 tsl=0 tscl=0 ghl=0)//依次是：线程名、线程优先级、线程创建时的序号线程当前状态 "main" prio=5 tid=1 SUSPENDED// 线程名：main 优先级5  创建序号 1 线程状态：SUSPENDED  | sysTid=6012 nice=0 sched=0/0 cgrp=apps handle=1074671612  | state=S schedstat=( 2402929933 1242053208 8116 ) utm=191 stm=48 core=1  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:~1585)  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1045)  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5522)  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)  at android.view.Choreographer.doCallbacks(Choreographer.java:562)  at android.view.Choreographer.doFrame(Choreographer.java:532)  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)  at android.os.Handler.handleCallback(Handler.java:730)  at android.os.Handler.dispatchMessage(Handler.java:92)  at android.os.Looper.loop(Looper.java:137)  at android.app.ActivityThread.main(ActivityThread.java:5103)  at java.lang.reflect.Method.invokeNative(Native Method)  at java.lang.reflect.Method.invoke(Method.java:525)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:773)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:589)  at dalvik.system.NativeStart.main(Native Method)"PriorityExecutor #5" prio=5 tid=15 WAIT  | group="main" sCount=1 dsCount=0 obj=0x4214d3d8 self=0x52301318  | sysTid=6041 nice=10 sched=0/0 cgrp=apps/bg_non_interactive handle=1378883432  | state=S schedstat=( 341597 4190770 3 ) utm=0 stm=0 core=0  at java.lang.Object.wait(Native Method)  - waiting on <0x4214d550> (a java.lang.VMThread) held by tid=15 (PriorityExecutor #5)  at java.lang.Thread.parkFor(Thread.java:1205)  at sun.misc.Unsafe.park(Unsafe.java:325)  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:159)  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2019)  at com.lidroid.xutils.task.PriorityObjectBlockingQueue.take(PriorityObjectBlockingQueue.java:274)  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1013)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1073)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)  at java.lang.Thread.run(Thread.java:841)"PriorityExecutor #4" prio=5 tid=14 WAIT  | group="main" sCount=1 dsCount=0 obj=0x4214c958 self=0x5272d980  | sysTid=6040 nice=10 sched=0/0 cgrp=apps/bg_non_interactive handle=1383259600  | state=S schedstat=( 16335142 37377692 95 ) utm=1 stm=0 core=0  at java.lang.Object.wait(Native Method)  - waiting on <0x4214ca98> (a java.lang.VMThread) held by tid=14 (PriorityExecutor #4)  at java.lang.Thread.parkFor(Thread.java:1205)  at sun.misc.Unsafe.park(Unsafe.java:325)  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:159)  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2019)  at com.lidroid.xutils.task.PriorityObjectBlockingQueue.take(PriorityObjectBlockingQueue.java:274)  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1013)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1073)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)  at java.lang.Thread.run(Thread.java:841)"PriorityExecutor #3" prio=5 tid=13 WAIT  | group="main" sCount=1 dsCount=0 obj=0x4214be90 self=0x5272e6a8  | sysTid=6039 nice=10 sched=0/0 cgrp=apps/bg_non_interactive handle=1383257392  | state=S schedstat=( 1407948 916560 16 ) utm=0 stm=0 core=0  at java.lang.Object.wait(Native Method)  - waiting on <0x4214c140> (a java.lang.VMThread) held by tid=13 (PriorityExecutor #3)  at java.lang.Thread.parkFor(Thread.java:1205)  at sun.misc.Unsafe.park(Unsafe.java:325)  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:159)  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2019)  at com.lidroid.xutils.task.PriorityObjectBlockingQueue.take(PriorityObjectBlockingQueue.java:274)  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1013)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1073)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)  at java.lang.Thread.run(Thread.java:841)"PriorityExecutor #2" prio=5 tid=12 WAIT  | group="main" sCount=1 dsCount=0 obj=0x42154638 self=0x5272cc90  | sysTid=6038 nice=10 sched=0/0 cgrp=apps/bg_non_interactive handle=1383256288  | state=S schedstat=( 20251581 51870492 151 ) utm=1 stm=0 core=0  at java.lang.Object.wait(Native Method)  - waiting on <0x421547d0> (a java.lang.VMThread) held by tid=12 (PriorityExecutor #2)  at java.lang.Thread.parkFor(Thread.java:1205)  at sun.misc.Unsafe.park(Unsafe.java:325)  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:159)  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2019)  at com.lidroid.xutils.task.PriorityObjectBlockingQueue.take(PriorityObjectBlockingQueue.java:274)  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1013)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1073)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)  at java.lang.Thread.run(Thread.java:841)"PriorityExecutor #1" prio=5 tid=11 WAIT  | group="main" sCount=1 dsCount=0 obj=0x42154370 self=0x52730630  | sysTid=6037 nice=10 sched=0/0 cgrp=apps/bg_non_interactive handle=1103892024  | state=S schedstat=( 2237642 16217040 18 ) utm=0 stm=0 core=0  at java.lang.Object.wait(Native Method)  - waiting on <0x42154530> (a java.lang.VMThread) held by tid=11 (PriorityExecutor #1)  at java.lang.Thread.parkFor(Thread.java:1205)  at sun.misc.Unsafe.park(Unsafe.java:325)  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:159)  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2019)  at com.lidroid.xutils.task.PriorityObjectBlockingQueue.take(PriorityObjectBlockingQueue.java:274)  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1013)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1073)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)  at java.lang.Thread.run(Thread.java:841)"Binder_2" prio=5 tid=10 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x421416c0 self=0x41c1e638  | sysTid=6024 nice=0 sched=0/0 cgrp=apps handle=1103225840  | state=S schedstat=( 2307968 2046145 22 ) utm=0 stm=0 core=0  #00  pc 0001b320  /system/lib/libc.so (__ioctl+8)  #01  pc 0002b9ab  /system/lib/libc.so (ioctl+14)  #02  pc 0001b539  /system/lib/libbinder.so (android::IPCThreadState::talkWithDriver(bool)+140)  #03  pc 0001bcd7  /system/lib/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+154)  #04  pc 0001fae9  /system/lib/libbinder.so  #05  pc 00011a8d  /system/lib/libutils.so (android::Thread::_threadLoop(void*)+216)  #06  pc 0004bd21  /system/lib/libandroid_runtime.so (android::AndroidRuntime::javaThreadShell(void*)+68)  #07  pc 00011581  /system/lib/libutils.so  #08  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #09  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at dalvik.system.NativeStart.run(Native Method)"Binder_1" prio=5 tid=9 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x421409b8 self=0x41c1db88  | sysTid=6023 nice=0 sched=0/0 cgrp=apps handle=1103223104  | state=S schedstat=( 3963651 6845165 24 ) utm=0 stm=0 core=2  #00  pc 0001b320  /system/lib/libc.so (__ioctl+8)  #01  pc 0002b9ab  /system/lib/libc.so (ioctl+14)  #02  pc 0001b539  /system/lib/libbinder.so (android::IPCThreadState::talkWithDriver(bool)+140)  #03  pc 0001bcd7  /system/lib/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+154)  #04  pc 0001fae9  /system/lib/libbinder.so  #05  pc 00011a8d  /system/lib/libutils.so (android::Thread::_threadLoop(void*)+216)  #06  pc 0004bd21  /system/lib/libandroid_runtime.so (android::AndroidRuntime::javaThreadShell(void*)+68)  #07  pc 00011581  /system/lib/libutils.so  #08  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #09  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at dalvik.system.NativeStart.run(Native Method)"FinalizerWatchdogDaemon" daemon prio=5 tid=8 WAIT  | group="system" sCount=1 dsCount=0 obj=0x4213d7e8 self=0x41c1d0a0  | sysTid=6022 nice=0 sched=0/0 cgrp=apps handle=1103222000  | state=S schedstat=( 169252 273121 4 ) utm=0 stm=0 core=2  at java.lang.Object.wait(Native Method)  - waiting on <0x41ea2830> (a java.lang.Daemons$FinalizerWatchdogDaemon)  at java.lang.Object.wait(Object.java:364)  at java.lang.Daemons$FinalizerWatchdogDaemon.waitForObject(Daemons.java:230)  at java.lang.Daemons$FinalizerWatchdogDaemon.run(Daemons.java:207)  at java.lang.Thread.run(Thread.java:841)"FinalizerDaemon" daemon prio=5 tid=7 WAIT  | group="system" sCount=1 dsCount=0 obj=0x4213d638 self=0x59cd1148  | sysTid=6021 nice=0 sched=0/0 cgrp=apps handle=1506612632  | state=S schedstat=( 19178147 5530289 45 ) utm=1 stm=0 core=3  at java.lang.Object.wait(Native Method)  - waiting on <0x41e8b568> (a java.lang.ref.ReferenceQueue)  at java.lang.Object.wait(Object.java:401)  at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:102)  at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:73)  at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:170)  at java.lang.Thread.run(Thread.java:841)"ReferenceQueueDaemon" daemon prio=5 tid=6 WAIT  | group="system" sCount=1 dsCount=0 obj=0x4213d4d0 self=0x59cd08a8  | sysTid=6020 nice=0 sched=0/0 cgrp=apps handle=1506610424  | state=S schedstat=( 2228290 3801987 33 ) utm=0 stm=0 core=2  at java.lang.Object.wait(Native Method)  - waiting on <0x41e8b490>   at java.lang.Object.wait(Object.java:364)  at java.lang.Daemons$ReferenceQueueDaemon.run(Daemons.java:130)  at java.lang.Thread.run(Thread.java:841)"Compiler" daemon prio=5 tid=5 VMWAIT  | group="system" sCount=1 dsCount=0 obj=0x4213d3e0 self=0x59cd0250  | sysTid=6019 nice=0 sched=0/0 cgrp=apps handle=1506607112  | state=S schedstat=( 365619316 81085896 3099 ) utm=17 stm=18 core=1  #00  pc 0001c5f0  /system/lib/libc.so (__futex_syscall3+8)  #01  pc 0000e6a8  /system/lib/libc.so (__pthread_cond_timedwait_relative+48)  #02  pc 0000e708  /system/lib/libc.so (__pthread_cond_timedwait+64)  #03  pc 0007307b  /system/lib/libdvm.so  #04  pc 0005440d  /system/lib/libdvm.so  #05  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #06  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at dalvik.system.NativeStart.run(Native Method)"JDWP" daemon prio=5 tid=4 VMWAIT  | group="system" sCount=1 dsCount=0 obj=0x4213d2f8 self=0x59298370  | sysTid=6018 nice=0 sched=0/0 cgrp=apps handle=1495892264  | state=S schedstat=( 526723 2311140 11 ) utm=0 stm=0 core=2  #00  pc 0001c0c4  /system/lib/libc.so (recvmsg+8)  #01  pc 00060a5b  /system/lib/libdvm.so  #02  pc 00060c8f  /system/lib/libdvm.so  #03  pc 0006395f  /system/lib/libdvm.so  #04  pc 0005440d  /system/lib/libdvm.so  #05  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #06  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at dalvik.system.NativeStart.run(Native Method)"Signal Catcher" daemon prio=5 tid=3 RUNNABLE  | group="system" sCount=0 dsCount=0 obj=0x4213d200 self=0x59297ad0  | sysTid=6017 nice=0 sched=0/0 cgrp=apps handle=1495890056  | state=R schedstat=( 17944062 3806465 24 ) utm=1 stm=0 core=2  at dalvik.system.NativeStart.run(Native Method)"GC" daemon prio=5 tid=2 VMWAIT  | group="system" sCount=1 dsCount=0 obj=0x4213d120 self=0x59297230  | sysTid=6016 nice=0 sched=0/0 cgrp=apps handle=1495887848  | state=S schedstat=( 46052188 14643875 115 ) utm=3 stm=0 core=0  #00  pc 0001c5f0  /system/lib/libc.so (__futex_syscall3+8)  #01  pc 0000e6a8  /system/lib/libc.so (__pthread_cond_timedwait_relative+48)  #02  pc 0000e708  /system/lib/libc.so (__pthread_cond_timedwait+64)  #03  pc 00071d5f  /system/lib/libdvm.so  #04  pc 0005440d  /system/lib/libdvm.so  #05  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #06  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at dalvik.system.NativeStart.run(Native Method)NATIVE THREADS:"ybroad.launcher" sysTid=6044 nice=0 sched=0/0 cgrp=apps  | state=S schedstat=( 28535 0 1 ) utm=0 stm=0 core=2"ybroad.launcher" sysTid=6045 nice=0 sched=0/0 cgrp=apps  | state=S schedstat=( 5934826 18041494 192 ) utm=0 stm=0 core=0"ybroad.launcher" sysTid=6047 nice=0 sched=0/0 cgrp=apps  | state=S schedstat=( 41991903 31647623 449 ) utm=0 stm=3 core=0"ybroad.launcher" sysTid=6048 nice=0 sched=0/0 cgrp=apps  | state=S schedstat=( 8821631 43405553 239 ) utm=0 stm=0 core=1----- end 6012 ---------- pid 1375 at 2014-08-16 12:44:43 -----Cmd line: system_serverJNI: CheckJNI is off; workarounds are off; pins=3; globals=593 (plus 30 weak)DALVIK THREADS:(mutexes: tll=0 tsl=0 tscl=0 ghl=0)"main" prio=5 tid=1 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x41e9a578 self=0x41d10778  | sysTid=1375 nice=0 sched=0/0 cgrp=apps handle=1074671612  | state=S schedstat=( 23099158711 5734754939 194687 ) utm=1476 stm=833 core=0  #00  pc 0001b320  /system/lib/libc.so (__ioctl+8)  #01  pc 0002b9ab  /system/lib/libc.so (ioctl+14)  #02  pc 0001b539  /system/lib/libbinder.so (android::IPCThreadState::talkWithDriver(bool)+140)  #03  pc 0001bcd7  /system/lib/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+154)  #04  pc 000013c3  /system/lib/libsystem_server.so (system_init+378)  #05  pc 0001dc4c  /system/lib/libdvm.so (dvmPlatformInvoke+112)  #06  pc 0004df2f  /system/lib/libdvm.so (dvmCallJNIMethod(unsigned int const*, JValue*, Method const*, Thread*)+398)  #07  pc 00027060  /system/lib/libdvm.so  #08  pc 0002b64c  /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)  #09  pc 0006023f  /system/lib/libdvm.so (dvmInvokeMethod(Object*, Method const*, ArrayObject*, ArrayObject*, ClassObject*, bool)+350)  #10  pc 00067e3f  /system/lib/libdvm.so  #11  pc 00027060  /system/lib/libdvm.so  #12  pc 0002b64c  /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)  #13  pc 0005ff81  /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+292)  #14  pc 00049bc7  /system/lib/libdvm.so  #15  pc 0004bd87  /system/lib/libandroid_runtime.so  #16  pc 0004ca17  /system/lib/libandroid_runtime.so (android::AndroidRuntime::start(char const*, char const*)+378)  #17  pc 0000105b  /system/bin/app_process  #18  pc 0000db4f  /system/lib/libc.so (__libc_init+50)  #19  pc 00000d7c  /system/bin/app_process  at com.android.server.SystemServer.init1(Native Method)  at com.android.server.SystemServer.main(SystemServer.java:1183)  at java.lang.reflect.Method.invokeNative(Native Method)  at java.lang.reflect.Method.invoke(Method.java:525)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:773)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:589)  at dalvik.system.NativeStart.main(Native Method)"AsyncTask #2" prio=5 tid=89 WAIT  | group="main" sCount=1 dsCount=0 obj=0x423a6b98 self=0x59771d08  | sysTid=2391 nice=0 sched=0/0 cgrp=apps handle=1500973936  | state=S schedstat=( 3672799 2067535 16 ) utm=0 stm=0 core=3  at java.lang.Object.wait(Native Method)  - waiting on <0x421a1be8> (a java.lang.VMThread) held by tid=89 (AsyncTask #2)  at java.lang.Thread.parkFor(Thread.java:1205)  at sun.misc.Unsafe.park(Unsafe.java:325)  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:159)  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2019)  at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:413)  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1013)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1073)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)  at java.lang.Thread.run(Thread.java:841)"WifiMonitor" prio=5 tid=88 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x42334b20 self=0x59767270  | sysTid=2262 nice=0 sched=0/0 cgrp=apps handle=1496667712  | state=S schedstat=( 2650153 18957633 18 ) utm=0 stm=0 core=2  #00  pc 0001c4b0  /system/lib/libc.so (poll+12)  #01  pc 00005ccb  /system/lib/libhardware_legacy.so (wifi_ctrl_recv+66)  #02  pc 00005d85  /system/lib/libhardware_legacy.so (wifi_wait_on_socket+44)  #03  pc 0006bd8f  /system/lib/libandroid_runtime.so  #04  pc 0001dc4c  /system/lib/libdvm.so (dvmPlatformInvoke+112)  #05  pc 0004df2f  /system/lib/libdvm.so (dvmCallJNIMethod(unsigned int const*, JValue*, Method const*, Thread*)+398)  #06  pc 00027060  /system/lib/libdvm.so  #07  pc 0002b64c  /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)  #08  pc 0005ff81  /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+292)  #09  pc 0005ffab  /system/lib/libdvm.so (dvmCallMethod(Thread*, Method const*, Object*, JValue*, ...)+20)  #10  pc 00054d2b  /system/lib/libdvm.so  #11  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #12  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at android.net.wifi.WifiNative.waitForEvent(Native Method)  at android.net.wifi.WifiNative.waitForEvent(WifiNative.java:101)  at android.net.wifi.WifiMonitor$MonitorThread.run(WifiMonitor.java:428)"WifiMonitor" prio=5 tid=79 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x423b1ab8 self=0x59766e20  | sysTid=2243 nice=0 sched=0/0 cgrp=apps handle=1500579736  | state=S schedstat=( 18832173 27053387 77 ) utm=0 stm=1 core=1  #00  pc 0001c4b0  /system/lib/libc.so (poll+12)  #01  pc 00005ccb  /system/lib/libhardware_legacy.so (wifi_ctrl_recv+66)  #02  pc 00005d85  /system/lib/libhardware_legacy.so (wifi_wait_on_socket+44)  #03  pc 0006bd8f  /system/lib/libandroid_runtime.so  #04  pc 0001dc4c  /system/lib/libdvm.so (dvmPlatformInvoke+112)  #05  pc 0004df2f  /system/lib/libdvm.so (dvmCallJNIMethod(unsigned int const*, JValue*, Method const*, Thread*)+398)  #06  pc 00027060  /system/lib/libdvm.so  #07  pc 0002b64c  /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)  #08  pc 0005ff81  /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+292)  #09  pc 0005ffab  /system/lib/libdvm.so (dvmCallMethod(Thread*, Method const*, Object*, JValue*, ...)+20)  #10  pc 00054d2b  /system/lib/libdvm.so  #11  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #12  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at android.net.wifi.WifiNative.waitForEvent(Native Method)  at android.net.wifi.WifiNative.waitForEvent(WifiNative.java:101)  at android.net.wifi.WifiMonitor$MonitorThread.run(WifiMonitor.java:428)"Binder_C" prio=5 tid=87 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x423125c0 self=0x5977ef58  | sysTid=1901 nice=0 sched=0/0 cgrp=apps handle=1496648368  | state=S schedstat=( 26136515152 5573609667 186413 ) utm=1517 stm=1096 core=3  #00  pc 0001c5f4  /system/lib/libc.so (__futex_syscall3+12)  #01  pc 0000e6a8  /system/lib/libc.so (__pthread_cond_timedwait_relative+48)  #02  pc 00020771  /system/lib/libinput.so  #03  pc 00022019  /system/lib/libinput.so (android::InputDispatcher::injectInputEvent(android::InputEvent const*, int, int, int, int, unsigned int)+800)  #04  pc 0000a9ff  /system/lib/libandroid_servers.so  #05  pc 0001dc4c  /system/lib/libdvm.so (dvmPlatformInvoke+112)  #06  pc 0004df2f  /system/lib/libdvm.so (dvmCallJNIMethod(unsigned int const*, JValue*, Method const*, Thread*)+398)  #07  pc 00027060  /system/lib/libdvm.so  #08  pc 0002b64c  /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)  #09  pc 0005ff81  /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+292)  #10  pc 0004cc91  /system/lib/libdvm.so  #11  pc 0006b213  /system/lib/libandroid_runtime.so  #12  pc 0006f82f  /system/lib/libandroid_runtime.so  #13  pc 00017f1d  /system/lib/libbinder.so (android::BBinder::transact(unsigned int, android::Parcel const&, android::Parcel*, unsigned int)+60)  #14  pc 0001b8e5  /system/lib/libbinder.so (android::IPCThreadState::executeCommand(int)+508)  #15  pc 0001bcf3  /system/lib/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+182)  #16  pc 0001fae9  /system/lib/libbinder.so  #17  pc 00011a8d  /system/lib/libutils.so (android::Thread::_threadLoop(void*)+216)  #18  pc 0004bd21  /system/lib/libandroid_runtime.so (android::AndroidRuntime::javaThreadShell(void*)+68)  #19  pc 00011581  /system/lib/libutils.so  #20  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #21  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at com.android.server.input.InputManagerService.nativeInjectInputEvent(Native Method)  at com.android.server.input.InputManagerService.injectInputEvent(InputManagerService.java:534)  at android.hardware.input.IInputManager$Stub.onTransact(IInputManager.java:170)  at android.os.Binder.execTransact(Binder.java:388)  at dalvik.system.NativeStart.run(Native Method)"Binder_B" prio=5 tid=86 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x4236ee80 self=0x5978c908  | sysTid=1900 nice=0 sched=0/0 cgrp=apps handle=1501033856  | state=S schedstat=( 18675932575 2816663578 195259 ) utm=1086 stm=781 core=0  #00  pc 0001b320  /system/lib/libc.so (__ioctl+8)  #01  pc 0002b9ab  /system/lib/libc.so (ioctl+14)  #02  pc 0001b539  /system/lib/libbinder.so (android::IPCThreadState::talkWithDriver(bool)+140)  #03  pc 0001bcd7  /system/lib/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+154)  #04  pc 0001fae9  /system/lib/libbinder.so  #05  pc 00011a8d  /system/lib/libutils.so (android::Thread::_threadLoop(void*)+216)  #06  pc 0004bd21  /system/lib/libandroid_runtime.so (android::AndroidRuntime::javaThreadShell(void*)+68)  #07  pc 00011581  /system/lib/libutils.so  #08  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #09  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at dalvik.system.NativeStart.run(Native Method)"Binder_A" prio=5 tid=82 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x422c66e0 self=0x59288458  | sysTid=1899 nice=0 sched=0/0 cgrp=apps handle=1473754056  | state=S schedstat=( 28407006674 1139065291 197317 ) utm=1753 stm=1086 core=3  #00  pc 0001b320  /system/lib/libc.so (__ioctl+8)  #01  pc 0002b9ab  /system/lib/libc.so (ioctl+14)  #02  pc 0001b539  /system/lib/libbinder.so (android::IPCThreadState::talkWithDriver(bool)+140)  #03  pc 0001bcd7  /system/lib/libbinder.so (android::IPCThreadState::joinThreadPool(bool)+154)  #04  pc 0001fae9  /system/lib/libbinder.so  #05  pc 00011a8d  /system/lib/libutils.so (android::Thread::_threadLoop(void*)+216)  #06  pc 0004bd21  /system/lib/libandroid_runtime.so (android::AndroidRuntime::javaThreadShell(void*)+68)  #07  pc 00011581  /system/lib/libutils.so  #08  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #09  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at dalvik.system.NativeStart.run(Native Method)"pool-1-thread-1" prio=5 tid=85 WAIT  | group="main" sCount=1 dsCount=0 obj=0x42360de0 self=0x5977c7c8  | sysTid=1869 nice=0 sched=0/0 cgrp=apps handle=1501023256  | state=S schedstat=( 36792546 37524468 105 ) utm=2 stm=1 core=1  at java.lang.Object.wait(Native Method)  - waiting on <0x422ad870> (a java.lang.VMThread) held by tid=85 (pool-1-thread-1)  at java.lang.Thread.parkFor(Thread.java:1205)  at sun.misc.Unsafe.park(Unsafe.java:325)  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:159)  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2019)  at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:413)  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1013)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1073)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)  at java.lang.Thread.run(Thread.java:841)"SoundPoolThread" prio=5 tid=84 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x4234dd18 self=0x59288008  | sysTid=1787 nice=0 sched=0/0 cgrp=apps handle=1501052992  | state=S schedstat=( 2719918 1463037 21 ) utm=0 stm=0 core=1  #00  pc 0001c5f0  /system/lib/libc.so (__futex_syscall3+8)  #01  pc 0000e6a8  /system/lib/libc.so (__pthread_cond_timedwait_relative+48)  #02  pc 0000e708  /system/lib/libc.so (__pthread_cond_timedwait+64)  #03  pc 000697e9  /system/lib/libmedia.so  #04  pc 0006983b  /system/lib/libmedia.so (android::SoundPoolThread::read()+16)  #05  pc 000699e7  /system/lib/libmedia.so (android::SoundPoolThread::run()+14)  #06  pc 0004bd21  /system/lib/libandroid_runtime.so (android::AndroidRuntime::javaThreadShell(void*)+68)  #07  pc 00011581  /system/lib/libutils.so  #08  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #09  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at dalvik.system.NativeStart.run(Native Method)"SoundPool" prio=5 tid=83 NATIVE  | group="main" sCount=1 dsCount=0 obj=0x422b7470 self=0x5977fdc8  | sysTid=1785 nice=0 sched=0/0 cgrp=apps handle=1501039224  | state=S schedstat=( 43918396 52908113 631 ) utm=0 stm=4 core=1  #00  pc 0001c5f0  /system/lib/libc.so (__futex_syscall3+8)  #01  pc 0000e6a8  /system/lib/libc.so (__pthread_cond_timedwait_relative+48)  #02  pc 0000e708  /system/lib/libc.so (__pthread_cond_timedwait+64)  #03  pc 0006937f  /system/lib/libmedia.so (android::SoundPool::run()+20)  #04  pc 0004bd21  /system/lib/libandroid_runtime.so (android::AndroidRuntime::javaThreadShell(void*)+68)  #05  pc 00011581  /system/lib/libutils.so  #06  pc 0000ca58  /system/lib/libc.so (__thread_entry+72)  #07  pc 0000cbd4  /system/lib/libc.so (pthread_create+208)  at dalvik.system.NativeStart.run(Native Method)

参考frameworks\base\services\java\com\android\server\am\ActivityManagerService.java 中的appNotResponding函数的处理流程可以看出trace.txt 文件的生成过程，在trace.txt 文件中一般第一进程为发生ANR的进程。分析上面的trace.txt中的第一个进程 com.hybroad.launcher 是产生ANR的进程，与Log日志也匹配，通过查看线程状态，可以看出ViewRoot刷新UI是阻塞了。trace日志中还能看出com.hybroad.launcher中多个异步任务都是在在WAIT状态，如PriorityExecutor #5" prio=5 tid=15 WAIT ，这些异步任务是从后台下载图片显示。这里巧合的是Monkey程序触发的操作逻辑导致UI刷新阻塞。

三、如何避免ANR

要想不出现ANR是很困难的，但也是有办法能避免的。在主线程中所做的任何耗时的操作都有可能造成ANR，因为这些耗时的操作会使得主线程没有机会处理用户输入事件或者广播事件。因此在主线程中执行的任何函数所做的工作都应该尽可能的少，特别是对于Activity的生命周期函数来说。网络和数据库操作，读写设备，以及诸如位图变换的一些耗时的操作，都应该放在子线程中完成。主线程不需要等待子线程的执行，主线程应该创建一个与其绑定的Handler对象，子线程执行完毕后通过 Handler通知主线程。

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