浅谈ANR如何分析解决ANR

一:什么是ANR
                  ANR:Application Not Responding,即应用无响应
二:ANR的类型
                  ANR一般有三种类型:
                  1:KeyDispatchTimeout(5 seconds) --主要类型
                  按键或触摸事件在特定时间内无响应
                  2:BroadcastTimeout(10 seconds)
                  BroadcastReceiver在特定时间内无法处理完成
                  3:ServiceTimeout(20 seconds) --小概率类型
                  Service在特定的时间内无法处理完成
  三:KeyDispatchTimeout
                  Akey or touch event was not dispatched within the specified
                  time(按键或触摸事件在特定时间内无响应)
                  具体的超时时间的定义在framework下的
                  ActivityManagerService.java
                  //How long we wait until we timeout on key dispatching.
                  staticfinal int KEY_DISPATCHING_TIMEOUT = 5*1000
四:为什么会超时呢?
                  超时时间的计数一般是从按键分发给app开始。超时的原因一般有两种:
                  (1)当前的事件没有机会得到处理(即UI线程正在处理前一个事件,没有及时的完成或者looper被某种原因阻塞住了)
                  (2)当前的事件正在处理,但没有及时完成
五:如何避免KeyDispatchTimeout
                  1:UI线程尽量只做跟UI相关的工作
                  2:耗时的工作(比如数据库操作,I/O,连接网络或者别的有可能阻碍UI线程的操作)把它放入单独的线程处理
                  3:尽量用Handler来处理UIthread和别的thread之间的交互


 六:UI线程
                  说了那么多的UI线程,那么哪些属于UI线程呢?
                  UI线程主要包括如下:
                    1.Activity:onCreate(), onResume(), onDestroy(), onKeyDown(),
                    onClick(),etc
                    2.AsyncTask: onPreExecute(), onProgressUpdate(),
                    onPostExecute(), onCancel,etc
                   3. Mainthread handler: handleMessage(), post*(runnable r), etc

                   4. other

    七:如何去分析ANR
                  先看个LOG:
                  04-01 13:12:11.572 I/InputDispatcher( 220): Application is not  responding:Window{2b263310com.android.email/com.android.email.activity.SplitScreenActivitypaused=false}.
                   5009.8ms since event, 5009.5ms since waitstarted
                  04-0113:12:11.572 I/WindowManager( 220): Input event
                  dispatching timedout sending
                  tocom.android.email/com.android.email.activity.SplitScreenActivity

                  04-01 13:12:14.123 I/Process(  220): Sending signal. PID:    21404 SIG: 3---发生ANR的时间和生成trace.txt的时间
                  04-01 13:12:14.123 I/dalvikvm(21404):threadid=4: reacting to
                  signal 3
                  ……
                  04-0113:12:15.872 E/ActivityManager(  220): ANR in
                  com.android.email(com.android.email/.activity.SplitScreenActivity)
                  04-0113:12:15.872 E/ActivityManager(  220):
                  Reason:keyDispatchingTimedOut
                  04-0113:12:15.872 E/ActivityManager(  220): Load: 8.68 / 8.37  / 8.53
                  04-0113:12:15.872 E/ActivityManager(  220): CPUusage from   4361ms to 699ms ago ----CPU在ANR发生前的使用情况


                  04-0113:12:15.872 E/ActivityManager(  220):    5.5%21404/com.android.email: 1.3% user + 4.1% kernel / faults:
                  10 minor
                  04-0113:12:15.872 E/ActivityManager(  220):    4.3%220/system_server: 2.7% user + 1.5% kernel / faults: 11
                  minor 2 major
                  04-0113:12:15.872 E/ActivityManager(  220):     0.9%52/spi_qsd.0: 0% user + 0.9% kernel
                  04-0113:12:15.872 E/ActivityManager(  220):    0.5%65/irq/170-cyttsp-: 0% user + 0.5% kernel
                  04-0113:12:15.872 E/ActivityManager(  220):     0.5%296/com.android.systemui: 0.5% user + 0% kernel
                  04-0113:12:15.872 E/ActivityManager(  220): 100%TOTAL: 4.8%  user + 7.6% kernel + 87% iowait
                  04-0113:12:15.872 E/ActivityManager(  220): CPUusage from 3697ms to 4223ms later:-- ANR后CPU的使用量
                  04-0113:12:15.872 E/ActivityManager(  220):    25%21404/com.android.email: 25% user + 0% kernel / faults: 191  minor
                  04-0113:12:15.872 E/ActivityManager(  220):    16% 21603/__eas(par.hakan: 16% user + 0% kernel
                  04-0113:12:15.872 E/ActivityManager(  220):    7.2% 21406/GC: 7.2% user + 0% kernel
                  04-0113:12:15.872 E/ActivityManager(  220):    1.8% 21409/Compiler: 1.8% user + 0% kernel
                  04-0113:12:15.872 E/ActivityManager(  220):   5.5%220/system_server: 0% user + 5.5% kernel / faults: 1 minor
                  04-0113:12:15.872 E/ActivityManager(  220):    5.5% 263/InputDispatcher: 0% user + 5.5% kernel
                  04-0113:12:15.872 E/ActivityManager(  220): 32%TOTAL: 28% user  + 3.7% kernel


                  从LOG可以看出ANR的类型,CPU的使用情况,如果CPU使用量接近100%,说明当前设备很忙,有可能是CPU饥饿导致了ANR
                  如果CPU使用量很少,说明主线程被BLOCK了
                  如果IOwait很高,说明ANR有可能是主线程在进行I/O操作造成的
                  除了看LOG,解决ANR还得需要trace.txt文件,
                  如何获取呢?可以用如下命令获取
                    $chmod 777 /data/anr
                    $rm /data/anr/traces.txt
                    $ps
                    $kill -3 PID
                    adbpull data/anr/traces.txt ./mytraces.txt


                  从trace.txt文件,看到最多的是如下的信息:
                  -----pid 21404 at 2011-04-01 13:12:14 ----- 
                  Cmdline: com.android.email

                  DALVIK THREADS:
                  (mutexes: tll=0tsl=0 tscl=0 ghl=0 hwl=0 hwll=0)
                  "main" prio=5 tid=1NATIVE
                    | group="main" sCount=1 dsCount=0obj=0x2aad2248 self=0xcf70
                    | sysTid=21404 nice=0 sched=0/0cgrp=[fopen-error:2]
                  handle=1876218976
                    atandroid.os.MessageQueue.nativePollOnce(Native Method)
                    atandroid.os.MessageQueue.next(MessageQueue.java:119)
                    atandroid.os.Looper.loop(Looper.java:110)
                   at android.app.ActivityThread.main(ActivityThread.java:3688)
                   at java.lang.reflect.Method.invokeNative(Native Method)
                    atjava.lang.reflect.Method.invoke(Method.java:507)
                   
                  atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
                   at
                  com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
                   at dalvik.system.NativeStart.main(Native Method)
                  说明主线程在等待下条消息进入消息队列
八:Thread状态
                  ThreadState (defined at “dalvik/vm/thread.h “)
                  THREAD_UNDEFINED = -1, /* makes enum compatible with int32_t */
                  THREAD_ZOMBIE = 0, /* TERMINATED */
                  THREAD_RUNNING = 1, /* RUNNABLE or running now */
                  THREAD_TIMED_WAIT = 2, /* TIMED_WAITING in Object.wait() */
                  THREAD_MONITOR = 3, /* BLOCKED on a monitor */
                  THREAD_WAIT = 4, /* WAITING in Object.wait() */
                  THREAD_INITIALIZING= 5, /* allocated, not yet running */
                  THREAD_STARTING = 6, /* started, not yet on thread list */
                  THREAD_NATIVE = 7, /* off in a JNI native method */
                  THREAD_VMWAIT = 8, /* waiting on a VM resource */
                  THREAD_SUSPENDED = 9, /* suspended, usually by GC or debugger
                  */


九:如何调查并解决ANR
                  1:首先分析log
                  2: 从trace.txt文件查看调用stack.
                  3: 看代码
                  4:仔细查看ANR的成因(iowait?block?memoryleak?)

十:案例

案例1关键词:ContentResolver in AsyncTask onPostExecute, high iowait

Process:com.android.email
Activity:com.android.email/.activity.MessageView
Subject:keyDispatchingTimedOut
CPU usage from 2550ms to -2814ms ago:
5%187/system_server: 3.5% user + 1.4% kernel / faults: 86 minor 20major
4.4% 1134/com.android.email: 0.7% user + 3.7% kernel /faults: 38 minor 19 major
4% 372/com.android.eventstream: 0.7%user + 3.3% kernel / faults: 6 minor
1.1% 272/com.android.phone:0.9% user + 0.1% kernel / faults: 33 minor
0.9%252/com.android.systemui: 0.9% user + 0% kernel
0%409/com.android.eventstream.telephonyplugin: 0% user + 0% kernel /faults: 2 minor
0.1% 632/com.android.devicemonitor: 0.1% user + 0%kernel
100%TOTAL: 6.9% user + 8.2% kernel +84%iowait


-----pid 1134 at 2010-12-17 17:46:51 -----
Cmd line:com.android.email

DALVIK THREADS:
(mutexes: tll=0 tsl=0tscl=0 ghl=0 hwl=0 hwll=0)
"main" prio=5 tid=1 WAIT
|group="main" sCount=1 dsCount=0 obj=0x2aaca180self=0xcf20
| sysTid=1134 nice=0 sched=0/0 cgrp=[fopen-error:2]handle=1876218976
at java.lang.Object.wait(Native Method)
-waiting on <0x2aaca218> (a java.lang.VMThread)
atjava.lang.Thread.parkFor(Thread.java:1424)
atjava.lang.LangAccessImpl.parkFor(LangAccessImpl.java:48)
atsun.misc.Unsafe.park(Unsafe.java:337)
atjava.util.concurrent.locks.LockSupport.park(LockSupport.java:157)
atjava.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:808)
atjava.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:841)
atjava.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1171)
atjava.util.concurrent.locks.ReentrantLock$FairSync.lock(ReentrantLock.java:200)
atjava.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:261)
atandroid.database.sqlite.SQLiteDatabase.lock(SQLiteDatabase.java:378)
atandroid.database.sqlite.SQLiteCursor.(SQLiteCursor.java:222)
atandroid.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:53)
atandroid.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1356)
atandroid.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1235)
atandroid.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1189)
atandroid.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1271)
atcom.android.email.provider.EmailProvider.query(EmailProvider.java:1098)
atandroid.content.ContentProvider$Transport.query(ContentProvider.java:187)
atandroid.content.
ContentResolver.query(ContentResolver.java:268)
atcom.android.email.provider.EmailContent$Message.restoreMessageWithId(EmailContent.java:648)
atcom.android.email.Controller.setMessageRead(Controller.java:658)
atcom.android.email.activity.MessageView.onMarkAsRead(MessageView.java:700)
atcom.android.email.activity.MessageView.access$2500(MessageView.java:98)
at
com.android.email.activity.MessageView$LoadBodyTask.onPostExecute(MessageView.java:1290)
atcom.android.email.activity.MessageView$LoadBodyTask.onPostExecute(MessageView.java:1255)
atandroid.os.AsyncTask.finish(AsyncTask.java:417)
atandroid.os.AsyncTask.access$300(AsyncTask.java:127)
at
android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
atandroid.os.Handler.dispatchMessage(Handler.java:99)
atandroid.os.Looper.loop(Looper.java:123)
atandroid.app.ActivityThread.main(ActivityThread.java:3652)
atjava.lang.reflect.Method.invokeNative(Native Method)
atjava.lang.reflect.Method.invoke(Method.java:507)
atcom.android.internal.os.ZygoteIn

原因:IOWait很高,说明当前系统在忙于I/O,因此数据库操作被阻塞

原来:

final Message message=Message.restoreMessageWithId(mProviderContext,messageId);
if(message==null){
   return;
}

Account account=Account.restoreAccountWithId(mProviderContext,message.mAccountKey);

if(account==null){
   return;//isMessagingController returns false for null, but let's make itclear.
}

if(isMessagingController(account)){
   new Thread(){
       @Override
       public void run(){
          mLegacyController.processPendingActions(message.mAccountKey);
       }
   }.start();
}

解决后:

newThread() {
    finalMessagemessage=Message.restoreMessageWithId(mProviderContext,messageId);

    if(message==null){
        return;
    }

    Accountaccount=Account.restoreAccountWithId(mProviderContext,message.mAccountKey);

    if(account==null){
       return;//isMessagingController returns false for null, but let's make itclear.
    }

    if(isMessagingController(account)) {
        mLegacyController.processPendingActions(message.mAccountKey);
    }
}.start();

关于AsyncTask:http://developer.android.com/reference/android/os/AsyncTask.html


案例2关键词:UI线程进行网络数据的读写

ANRin process: com.android.mediascape:PhotoViewer (last incom.android.mediascape:PhotoViewer)
Annotation:keyDispatchingTimedOut
CPU usage:
Load: 6.74 / 6.89 / 6.12
CPUusage from 8254ms to 3224ms ago:
ovider.webmedia: 4% = 4% user +0% kernel / faults: 68 minor
system_server: 2% = 1% user + 0%kernel / faults: 18 minor
re-initialized>: 0% = 0% user + 0%kernel / faults: 50 minor
events/0: 0% = 0% user + 0%kernel
TOTAL:7% = 6% user + 1% kernel

DALVIKTHREADS:
""main"" prio=5 tid=3 NATIVE
|group=""main"" sCount=1 dsCount=0 s=Yobj=0x4001b240 self=0xbda8
| sysTid=2579 nice=0 sched=0/0cgrp=unknown handle=-1343993184
atorg.apache.harmony.luni.platform.OSNetworkSystem.receiveStreamImpl(NativeMethod)
atorg.apache.harmony.luni.platform.
OSNetworkSystem.receiveStream(OSNetworkSystem.java:478)
atorg.apache.harmony.luni.net.PlainSocketImpl.read(PlainSocketImpl.java:565)
atorg.apache.harmony.luni.net.SocketInputStream.read(SocketInputStream.java:87)
atorg.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnection$LimitedInputStream.read(HttpURLConnection.java:303)
atjava.io.InputStream.read(InputStream.java:133)
atjava.io.BufferedInputStream.fillbuf(BufferedInputStream.java:157)
atjava.io.BufferedInputStream.read(BufferedInputStream.java:346)
atandroid.graphics.BitmapFactory.nativeDecodeStream(Native Method)
atandroid.graphics.
BitmapFactory.decodeStream(BitmapFactory.java:459)
atcom.android.mediascape.activity.PhotoViewerActivity.
getPreviewImage(PhotoViewerActivity.java:4465)
atcom.android.mediascape.activity.PhotoViewerActivity.
dispPreview(PhotoViewerActivity.java:4406)
atcom.android.mediascape.activity.PhotoViewerActivity.access$6500(PhotoViewerActivity.java:125)

atcom.android.mediascape.activity.PhotoViewerActivity$33$1.run(PhotoViewerActivity.java:4558)
atandroid.os.Handler.handleCallback(Handler.java:587)
atandroid.os.Handler.dispatchMessage(Handler.java:92)
atandroid.os.Looper.loop(Looper.java:123)
atandroid.app.ActivityThread.main(ActivityThread.java:4370)
atjava.lang.reflect.Method.invokeNative(Native Method)
atjava.lang.reflect.Method.invoke(Method.java:521)
atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
atdalvik.system.NativeStart.main(Native Method)

关于网络连接,在设计的时候可以设置个timeout的时间或者放入独立的线程来处理。

关于Handler的问题,可以参考:http://developer.android.com/reference/android/os/Handler.html


案例3

关键词:Memoryleak/Thread leak

11-1621:41:42.560 I/ActivityManager( 1190): ANR in process:android.process.acore (last in android.process.acore)
11-1621:41:42.560 I/ActivityManager( 1190): Annotation:keyDispatchingTimedOut
11-16 21:41:42.560 I/ActivityManager(1190): CPU usage:
11-16 21:41:42.560 I/ActivityManager( 1190):Load: 11.5 / 11.1 / 11.09
11-16 21:41:42.560 I/ActivityManager(1190): CPU usage from 9046ms to 4018ms ago:
11-16 21:41:42.560I/ActivityManager( 1190):
d.process.acore:98%= 97% user + 0% kernel / faults: 1134 minor
11-16 21:41:42.560I/ActivityManager( 1190): system_server: 0% = 0% user + 0% kernel /faults: 1 minor
11-16 21:41:42.560 I/ActivityManager( 1190): adbd:0% = 0% user + 0% kernel
11-16 21:41:42.560 I/ActivityManager(1190): logcat: 0% = 0% user + 0% kernel
11-16 21:41:42.560I/ActivityManager( 1190):
TOTAL:100% = 98% user + 1% kernel

Cmdline: android.process.acore

DALVIK THREADS:
"main"prio=5 tid=3
VMWAIT
|group="main" sCount=1 dsCount=0 s=N obj=0x40026240self=0xbda8
| sysTid=1815 nice=0 sched=0/0 cgrp=unknownhandle=-1344001376
atdalvik.system.
VMRuntime.trackExternalAllocation(NativeMethod)
atandroid.graphics.Bitmap.nativeCreate(Native Method)
atandroid.graphics.
Bitmap.createBitmap(Bitmap.java:468)
atandroid.view.View.buildDrawingCache(View.java:6324)
atandroid.view.View.getDrawingCache(View.java:6178)
atandroid.view.ViewGroup.drawChild(ViewGroup.java:1541)
……
atcom.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1830)
atandroid.view.ViewRoot.draw(ViewRoot.java:1349)
atandroid.view.ViewRoot.performTraversals(ViewRoot.java:1114)
atandroid.view.ViewRoot.handleMessage(ViewRoot.java:1633)
atandroid.os.Handler.dispatchMessage(Handler.java:99)
atandroid.os.Looper.loop(Looper.java:123)
atandroid.app.ActivityThread.main(ActivityThread.java:4370)
atjava.lang.reflect.Method.invokeNative(Native Method)
atjava.lang.reflect.Method.invoke(Method.java:521)
atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
atdalvik.system.NativeStart.main(Native Method)

"Thread-408"prio=5 tid=329 WAIT
|group="main" sCount=1 dsCount=0 s=N obj=0x46910d40self=0xcd0548
| sysTid=10602 nice=0 sched=0/0 cgrp=unknownhandle=15470792
at java.lang.Object.wait(Native Method)
-waiting on <0x468cd420> (a java.lang.Object)
atjava.lang.Object.wait(Object.java:288)
atcom.android.dialer.CallLogContentHelper$UiUpdaterExecutor$1.run(CallLogContentHelper.java:289)
atjava.lang.Thread.run(Thread.java:1096)

分析:

atdalvik.system.VMRuntime.trackExternalAllocation(NativeMethod)内存不足导致block在创建bitmap

**MEMINFO in pid 1360 [android.process.acore] **
native dalvik other total
size: 17036
23111 N/A 40147
allocated: 16484 20675 N/A 37159
free: 296 2436 N/A 2732

解决:如果机器的内存族,可以修改虚拟机的内存为36M或更大,不过最好是复查代码,查看哪些内存没有释放


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