解释ANR堆栈跟踪 [英] Interpreting an ANR stack trace
本文介绍了解释ANR堆栈跟踪的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用Android中PAHO库中的MQTT客户端实现.有时，应用程序在尝试发布消息时会锁定(我认为)，而我无法弄清发生了什么.
I'm working with an implementation of an MQTT client from the PAHO library in Android. Sometimes, the application locks up when it tried to publish a message (I think) and I can't figure out what's going on.
对于所有冗长的帖子，我也预先表示歉意.我真的不知道重要的部分是什么，所以SO"spoiler"标签>!不能隐藏细节.
I also apologize in advance for the all to long post. I really don't know what the important bits are and the SO "spoiler" tag >! wouldn't work to hide the details.
MQTT客户端在单独的线程中工作，但是我正在从UI线程调用mqtt客户端实例.也许这会导致锁定?我应该改为将客户端定义为线程的实例，并在线程中调用将操作转发给客户端的方法吗?
The MQTT client is working in a separate thread but I'm calling the mqtt client instance from the UI thread. Perhaps this causes a lockup? Should I instead define the client as an instance of the thread and call a method in the thread which forwards the action to the client?
当应用程序挂起时，会过一会儿ANR并要求关闭该应用程序.当我这样做时，我从/data/anr/traces.txt获取以下针对我的过程的堆栈跟踪:
When the app hangs, after a while ANR kicks in and asks to close the app. When I do that I get the following stack trace for my process from /data/anr/traces.txt:
DALVIK THREADS:
(mutexes: tll=0 tsl=0 tscl=0 ghl=0)
"main" prio=5 tid=1 WAIT
| group="main" sCount=1 dsCount=0 obj=0x40a59460 self=0x109d828
| sysTid=22050 nice=0 sched=0/0 cgrp=default handle=1074492552
| schedstat=( 8524633000 459501000 2204 ) utm=827 stm=25 core=1
at java.lang.Object.wait(Native Method)
- waiting on <0x410f4bd0> (a java.lang.Object)
at java.lang.Object.wait(Object.java:364)
at org.eclipse.paho.client.mqttv3.internal.MqttDeliveryTokenImpl.waitUntilSent(MqttDeliveryTokenImpl.java:120)
at org.eclipse.paho.client.mqttv3.internal.ClientComms.internalSend(ClientComms.java:85)
at org.eclipse.paho.client.mqttv3.internal.ClientComms.sendNoWait(ClientComms.java:118)
at org.eclipse.paho.client.mqttv3.MqttTopic.publish(MqttTopic.java:62)
at se.chalmers.pd.dashboard.MqttWorker.publish(MqttWorker.java:177)
at se.chalmers.pd.dashboard.ApplicationController.sendResponse(ApplicationController.java:238)
at se.chalmers.pd.dashboard.ApplicationController.onLoadComplete(ApplicationController.java:358)
at se.chalmers.pd.dashboard.MainActivity$CustomWebViewClient.onPageFinished(MainActivity.java:89)
at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:275)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
"Thread-3645" prio=5 tid=12 NATIVE
| group="main" sCount=1 dsCount=0 obj=0x4111a5f8 self=0x13cc698
| sysTid=22083 nice=0 sched=0/0 cgrp=default handle=19370528
| schedstat=( 35731000 17350000 70 ) utm=1 stm=2 core=0
at dalvik.system.NativeStart.run(Native Method)
"MQTT Client Callback" prio=5 tid=17 WAIT
| group="main" sCount=1 dsCount=0 obj=0x41118bf0 self=0x13bb500
| sysTid=22082 nice=0 sched=0/0 cgrp=default handle=20691280
| schedstat=( 392860000 110613000 493 ) utm=35 stm=4 core=1
at java.lang.Object.wait(Native Method)
- waiting on <0x410d1c48> (a java.lang.Object)
at java.lang.Object.wait(Object.java:364)
at org.eclipse.paho.client.mqttv3.internal.MqttDeliveryTokenImpl.waitUntilSent(MqttDeliveryTokenImpl.java:120)
at org.eclipse.paho.client.mqttv3.internal.ClientComms.internalSend(ClientComms.java:85)
at org.eclipse.paho.client.mqttv3.internal.ClientComms.sendNoWait(ClientComms.java:118)
at org.eclipse.paho.client.mqttv3.MqttTopic.publish(MqttTopic.java:62)
at se.chalmers.pd.dashboard.MqttWorker.publish(MqttWorker.java:177)
at se.chalmers.pd.dashboard.ApplicationController.sendResponse(ApplicationController.java:238)
at se.chalmers.pd.dashboard.ApplicationController.handleSystemMessage(ApplicationController.java:210)
at se.chalmers.pd.dashboard.ApplicationController.onMessage(ApplicationController.java:154)
at se.chalmers.pd.dashboard.MqttWorker$1$CustomMqttCallback.notifyCallbacks(MqttWorker.java:133)
at se.chalmers.pd.dashboard.MqttWorker$1$CustomMqttCallback.messageArrived(MqttWorker.java:128)
at org.eclipse.paho.client.mqttv3.internal.CommsCallback.handleMessage(CommsCallback.java:248)
at org.eclipse.paho.client.mqttv3.internal.CommsCallback.run(CommsCallback.java:139)
at java.lang.Thread.run(Thread.java:856)
"MQTT Client Comms Sender" prio=5 tid=16 TIMED_WAIT
| group="main" sCount=1 dsCount=0 obj=0x41118ae0 self=0x13bada0
| sysTid=22081 nice=0 sched=0/0 cgrp=default handle=20689392
| schedstat=( 6038000 11147000 189 ) utm=0 stm=0 core=0
at java.lang.Object.wait(Native Method)
- waiting on <0x410ffd90> (a java.lang.Object)
at java.lang.Object.wait(Object.java:401)
at org.eclipse.paho.client.mqttv3.internal.ClientState.get(ClientState.java:555)
at org.eclipse.paho.client.mqttv3.internal.CommsSender.run(CommsSender.java:83)
at java.lang.Thread.run(Thread.java:856)
"MQTT Client Comms Receiver" prio=5 tid=15 NATIVE
| group="main" sCount=1 dsCount=0 obj=0x41116048 self=0x13ba870
| sysTid=22080 nice=0 sched=0/0 cgrp=default handle=20619056
| schedstat=( 656144000 184252000 2369 ) utm=59 stm=6 core=1
at libcore.io.Posix.recvfromBytes(Native Method)
at libcore.io.Posix.recvfrom(Posix.java:131)
at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:164)
at libcore.io.IoBridge.recvfrom(IoBridge.java:503)
at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488)
at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46)
at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240)
at libcore.io.Streams.readSingleByte(Streams.java:41)
at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:236)
at java.io.DataInputStream.readByte(DataInputStream.java:96)
at org.eclipse.paho.client.mqttv3.internal.wire.MqttInputStream.readMqttWireMessage(MqttInputStream.java:51)
at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:86)
at java.lang.Thread.run(Thread.java:856)
"CookieSyncManager" prio=5 tid=14 NATIVE
| group="main" sCount=1 dsCount=0 obj=0x410d0ad0 self=0x1286e20
| sysTid=22066 nice=10 sched=0/0 cgrp=bg_non_interactive handle=19445224
| schedstat=( 562000 10095000 5 ) utm=0 stm=0 core=0
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:118)
at android.os.Looper.loop(Looper.java:118)
at android.webkit.WebSyncManager.run(WebSyncManager.java:90)
at android.webkit.CookieSyncManager.run(CookieSyncManager.java:61)
at java.lang.Thread.run(Thread.java:856)
"AsyncTask #1" prio=5 tid=13 WAIT
| group="main" sCount=1 dsCount=0 obj=0x410d0920 self=0x121f5b0
| sysTid=22065 nice=10 sched=0/0 cgrp=bg_non_interactive handle=19335920
| schedstat=( 5753000 108824000 12 ) utm=0 stm=0 core=0
at java.lang.Object.wait(Native Method)
- waiting on <0x410d0ab8> (a java.lang.VMThread) held by tid=13 (AsyncTask #1)
at java.lang.Thread.parkFor(Thread.java:1231)
at sun.misc.Unsafe.park(Unsafe.java:323)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:157)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2022)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:413)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1009)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1069)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
"WebViewCoreThread" prio=5 tid=11 NATIVE
| group="main" sCount=1 dsCount=0 obj=0x410caa38 self=0x1266550
| sysTid=22063 nice=0 sched=0/0 cgrp=default handle=18808064
| schedstat=( 273871000 128721000 264 ) utm=20 stm=7 core=0
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:118)
at android.os.Looper.loop(Looper.java:118)
at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:728)
at java.lang.Thread.run(Thread.java:856)
"Binder Thread #2" prio=5 tid=10 NATIVE
| group="main" sCount=1 dsCount=0 obj=0x410c1ef0 self=0x129de58
| sysTid=22062 nice=0 sched=0/0 cgrp=default handle=19025912
| schedstat=( 1983000 23992000 8 ) utm=0 stm=0 core=1
at dalvik.system.NativeStart.run(Native Method)
"Binder Thread #1" prio=5 tid=9 NATIVE
| group="main" sCount=1 dsCount=0 obj=0x410ba370 self=0x127cc90
| sysTid=22061 nice=0 sched=0/0 cgrp=default handle=18949528
| schedstat=( 2932000 32665000 18 ) utm=0 stm=0 core=0
at dalvik.system.NativeStart.run(Native Method)
"FinalizerWatchdogDaemon" daemon prio=5 tid=8 TIMED_WAIT
| group="main" sCount=1 dsCount=0 obj=0x410b6320 self=0x1227790
| sysTid=22059 nice=0 sched=0/0 cgrp=default handle=19405328
| schedstat=( 3721000 6943000 27 ) utm=0 stm=0 core=0
at java.lang.VMThread.sleep(Native Method)
at java.lang.Thread.sleep(Thread.java:1031)
at java.lang.Thread.sleep(Thread.java:1013)
at java.lang.Daemons$FinalizerWatchdogDaemon.run(Daemons.java:213)
at java.lang.Thread.run(Thread.java:856)
"FinalizerDaemon" daemon prio=5 tid=7 WAIT
| group="main" sCount=1 dsCount=0 obj=0x410b61c8 self=0x12207b8
| sysTid=22058 nice=0 sched=0/0 cgrp=default handle=19405208
| schedstat=( 1055000 601000 7 ) utm=0 stm=0 core=1
at java.lang.Object.wait(Native Method)
- waiting on <0x40a4f5d0> (a java.lang.ref.ReferenceQueue)
at java.lang.Object.wait(Object.java:401)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:102)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:73)
at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:168)
at java.lang.Thread.run(Thread.java:856)
"ReferenceQueueDaemon" daemon prio=5 tid=6 WAIT
| group="main" sCount=1 dsCount=0 obj=0x410b6060 self=0x129d168
| sysTid=22057 nice=0 sched=0/0 cgrp=default handle=19404976
| schedstat=( 573000 395000 11 ) utm=0 stm=0 core=1
at java.lang.Object.wait(Native Method)
- waiting on <0x40a4f4f8>
at java.lang.Object.wait(Object.java:364)
at java.lang.Daemons$ReferenceQueueDaemon.run(Daemons.java:128)
at java.lang.Thread.run(Thread.java:856)
"Compiler" daemon prio=5 tid=5 VMWAIT
| group="system" sCount=1 dsCount=0 obj=0x410b5f70 self=0x127c4d0
| sysTid=22056 nice=0 sched=0/0 cgrp=default handle=19172728
| schedstat=( 151015000 59330000 862 ) utm=9 stm=6 core=0
at dalvik.system.NativeStart.run(Native Method)
"JDWP" daemon prio=5 tid=4 VMWAIT
| group="system" sCount=1 dsCount=0 obj=0x410b5e88 self=0x12b39c8
| sysTid=22055 nice=0 sched=0/0 cgrp=default handle=19323736
| schedstat=( 4263000 2800000 18 ) utm=0 stm=0 core=1
at dalvik.system.NativeStart.run(Native Method)
"Signal Catcher" daemon prio=5 tid=3 RUNNABLE
| group="system" sCount=0 dsCount=0 obj=0x410b5d90 self=0x1268fd8
| sysTid=22054 nice=0 sched=0/0 cgrp=default handle=19014912
| schedstat=( 3760000 203000 4 ) utm=0 stm=0 core=1
at dalvik.system.NativeStart.run(Native Method)
"GC" daemon prio=5 tid=2 VMWAIT
| group="system" sCount=1 dsCount=0 obj=0x410b5cb0 self=0x12257d8
| sysTid=22053 nice=0 sched=0/0 cgrp=default handle=19042944
| schedstat=( 271726000 42594000 230 ) utm=26 stm=1 core=1
at dalvik.system.NativeStart.run(Native Method)
----- end 22050 -----
我已经启用了严格模式，但确实得到了一些有关磁盘写入警告的痕迹，但是它们都不是特别长.这些是严格的模式跟踪:
I've turned on strict mode and I do get some traces where it warns about disk writes but none of them are particulary long. These are the strict mode traces:
> > 04-30 10:29:50.053: D/StrictMode(22229): StrictMode policy violation;
> > ~duration=35 ms: android.os.StrictMode$StrictModeDiskReadViolation:
> > policy=31 violation=2 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.os.StrictMode$AndroidBlockGuardPolicy.onReadFromDisk(StrictMode.java:1089)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > libcore.io.BlockGuardOs.open(BlockGuardOs.java:106) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > libcore.io.IoBridge.open(IoBridge.java:390) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > java.io.FileOutputStream.(FileOutputStream.java:88) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.io.FileOutputStream.(FileOutputStream.java:73) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.MqttDefaultFilePersistence.put(MqttDefaultFilePersistence.java:162)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientState.send(ClientState.java:397)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientComms.internalSend(ClientComms.java:81)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientComms.sendNoWait(ClientComms.java:118)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.MqttTopic.publish(MqttTopic.java:62)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.MqttWorker.publish(MqttWorker.java:177) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.ApplicationController.sendResponse(ApplicationController.java:238)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.ApplicationController.onLoadComplete(ApplicationController.java:358)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.MainActivity$CustomWebViewClient.onPageFinished(MainActivity.java:95)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:275)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.os.Handler.dispatchMessage(Handler.java:99) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > android.os.Looper.loop(Looper.java:137) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > android.app.ActivityThread.main(ActivityThread.java:4424) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.lang.reflect.Method.invokeNative(Native Method) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.lang.reflect.Method.invoke(Method.java:511) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > dalvik.system.NativeStart.main(Native Method) 04-30 10:29:50.053:
>
>
> > D/StrictMode(22229): StrictMode policy violation; ~duration=26 ms:
> > android.os.StrictMode$StrictModeDiskWriteViolation: policy=31
> > violation=1 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.os.StrictMode$AndroidBlockGuardPolicy.onWriteToDisk(StrictMode.java:1063)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > libcore.io.BlockGuardOs.write(BlockGuardOs.java:190) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > libcore.io.IoBridge.write(IoBridge.java:447) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > java.io.FileOutputStream.write(FileOutputStream.java:187) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.MqttDefaultFilePersistence.put(MqttDefaultFilePersistence.java:163)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientState.send(ClientState.java:397)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientComms.internalSend(ClientComms.java:81)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientComms.sendNoWait(ClientComms.java:118)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.MqttTopic.publish(MqttTopic.java:62)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.MqttWorker.publish(MqttWorker.java:177) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.ApplicationController.sendResponse(ApplicationController.java:238)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.ApplicationController.onLoadComplete(ApplicationController.java:358)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.MainActivity$CustomWebViewClient.onPageFinished(MainActivity.java:95)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:275)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.os.Handler.dispatchMessage(Handler.java:99) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > android.os.Looper.loop(Looper.java:137) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > android.app.ActivityThread.main(ActivityThread.java:4424) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.lang.reflect.Method.invokeNative(Native Method) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.lang.reflect.Method.invoke(Method.java:511) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > dalvik.system.NativeStart.main(Native Method) 04-30 10:29:50.053:
>
>
> > D/StrictMode(22229): StrictMode policy violation; ~duration=18 ms:
> > android.os.StrictMode$StrictModeDiskWriteViolation: policy=31
> > violation=1 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.os.StrictMode$AndroidBlockGuardPolicy.onWriteToDisk(StrictMode.java:1063)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > libcore.io.BlockGuardOs.write(BlockGuardOs.java:190) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > libcore.io.IoBridge.write(IoBridge.java:447) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > java.io.FileOutputStream.write(FileOutputStream.java:187) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.MqttDefaultFilePersistence.put(MqttDefaultFilePersistence.java:165)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientState.send(ClientState.java:397)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientComms.internalSend(ClientComms.java:81)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientComms.sendNoWait(ClientComms.java:118)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.MqttTopic.publish(MqttTopic.java:62)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.MqttWorker.publish(MqttWorker.java:177) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.ApplicationController.sendResponse(ApplicationController.java:238)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.ApplicationController.onLoadComplete(ApplicationController.java:358)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.MainActivity$CustomWebViewClient.onPageFinished(MainActivity.java:95)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:275)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.os.Handler.dispatchMessage(Handler.java:99) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > android.os.Looper.loop(Looper.java:137) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > android.app.ActivityThread.main(ActivityThread.java:4424) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.lang.reflect.Method.invokeNative(Native Method) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.lang.reflect.Method.invoke(Method.java:511) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > dalvik.system.NativeStart.main(Native Method) 04-30 10:29:50.053:
>
>
> > D/StrictMode(22229): StrictMode policy violation; ~duration=2 ms:
> > android.os.StrictMode$StrictModeDiskWriteViolation: policy=31
> > violation=1 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.os.StrictMode$AndroidBlockGuardPolicy.onWriteToDisk(StrictMode.java:1063)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > libcore.io.BlockGuardOs.fsync(BlockGuardOs.java:96) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.io.FileDescriptor.sync(FileDescriptor.java:71) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.MqttDefaultFilePersistence.put(MqttDefaultFilePersistence.java:167)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientState.send(ClientState.java:397)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientComms.internalSend(ClientComms.java:81)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.internal.ClientComms.sendNoWait(ClientComms.java:118)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > org.eclipse.paho.client.mqttv3.MqttTopic.publish(MqttTopic.java:62)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.MqttWorker.publish(MqttWorker.java:177) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.ApplicationController.sendResponse(ApplicationController.java:238)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.ApplicationController.onLoadComplete(ApplicationController.java:358)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > se.chalmers.pd.dashboard.MainActivity$CustomWebViewClient.onPageFinished(MainActivity.java:95)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:275)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > android.os.Handler.dispatchMessage(Handler.java:99) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > android.os.Looper.loop(Looper.java:137) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > android.app.ActivityThread.main(ActivityThread.java:4424) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.lang.reflect.Method.invokeNative(Native Method) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > java.lang.reflect.Method.invoke(Method.java:511) 04-30 10:29:50.053:
> > D/StrictMode(22229): at
> > com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
> > 04-30 10:29:50.053: D/StrictMode(22229): at
> > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-30
> > 10:29:50.053: D/StrictMode(22229): at
> > dalvik.system.NativeStart.main(Native Method)
这就是启用StrictMode的方式
this is how I enable StrictMode
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectAll()
.penaltyLog()
.build());
供以后参考，并添加问题原因，我认为我应该在此处添加一些内容，以便搜索引擎查找.
Edit 2: for future reference and to add the cause of the issue I figured I should put something in here for the search engines to find.
事实证明，问题出在我们拥有的基于Node.JS的代理mqttjs.可能只是我们的实现，我还没有测试mqttjs开发人员的示例.在发布了一定数量的消息之后，代理停止发布并返回令牌. MQTT客户端在另一个线程中运行，但是由于它是从UI线程中调用的，因此导致了一些问题.
It turned out the problem was with the Node.JS based broker mqttjs we had. It could just be our implementation, I haven't tested the example from the mqttjs developer. The broker stopped publishing and returning tokens after a certain number of messages had been published. The MQTT client was running in another thread but since it was called from the UI thread it caused some issues.
无论如何，我们换成了Mosquitto，现在一切正常.
Anyway, we changed to Mosquitto and now everything is working well.
推荐答案
您的ANR发生在
org.eclipse.paho.client.mqttv3.internal.MqttDeliveryTokenImpl.waitUntilSent
因为此方法调用Object.wait，可能正在等待另一个线程通知它.
because this method calls Object.wait, probably waiting for another thread to notify it.
您的电话显然在这里
se.chalmers.pd.dashboard.MqttWorker.publish(MqttWorker.java:177)
在实现WebClient时会调用
which is called in your implementation of the WebClient
se.chalmers.pd.dashboard.MainActivity$CustomWebViewClient.onPageFinished(MainActivity.java:89)
此onPageFinished方法在UI线程上被调用.呼叫MqttTopic.publish是网络呼叫，并且显然会阻塞，直到呼叫完成为止.您应该将其放在线程或AsyncTask中，以免锁定UI线程.
This onPageFinished method is called on the UI thread. Calling MqttTopic.publish is a network call and apparently blocks until the call is done. You should put that in a Thread or an AsyncTask so it does not lock the UI Thread.
这篇关于解释ANR堆栈跟踪的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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