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如何分析解決Android ANR

來自:
http://blog.csdn.net/tjy1985/article/details/6777346
http://blog.csdn.net/tjy1985/article/details/6777355
http://blog.csdn.net/tjy1985/article/details/6777983
http://www.eoeandroid.com/forum.php?mod=viewthread&tid=165974

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一:什麼是ANR

ANR:Application Not Responding,即應用無響應

二:ANR的型別

ANR一般有三種類型:

1:KeyDispatchTimeout(5 seconds) --主要型別

按鍵或觸控事件在特定時間內無響應

2BroadcastTimeout(10 seconds)

BroadcastReceiver在特定時間內無法處理完成

3:ServiceTimeout(20 seconds) --小概率型別

Service在特定的時間內無法處理完成

三:KeyDispatchTimeout

Akey or touch event was not dispatched within the specified time(按鍵或觸控事件在特定時間內無響應)

具體的超時時間的定義在framework下的

ActivityManagerService.java

//How long we wait until we timeout on key dispatching.

staticfinal int KEY_DISPATCHING_TIMEOUT = 5*1000

四:為什麼會超時呢?

超時時間的計數一般是從按鍵分發給app開始。超時的原因一般有兩種

(1)當前的事件沒有機會得到處理(即UI執行緒正在處理前一個事件,沒有及時的完成或者looper被某種原因阻塞住了)

(2)當前的事件正在處理,但沒有及時完成

五:如何避免KeyDispatchTimeout

1UI執行緒儘量只做跟UI相關的工作

2:耗時的工作(比如資料庫操作,I/O,連線網路或者別的有可能阻礙UI執行緒的操作)把它放入單獨的執行緒處理

3:儘量用Handler來處理UIthread和別的thread之間的互動

六:UI執行緒

說了那麼多的UI執行緒,那麼哪些屬於UI執行緒呢?

UI執行緒主要包括如下:

  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

先看個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---發生ANR的時間和生成trace.txt的時間

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發生前的使用情況

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後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

從LOG可以看出ANR的型別,CPU的使用情況,如果CPU使用量接近100%,說明當前裝置很忙,有可能是CPU飢餓導致了ANR

如果CPU使用量很少,說明主執行緒被BLOCK了

如果IOwait很高,說明ANR有可能是主執行緒在進行I/O操作造成的

除了看LOG,解決ANR還得需要trace.txt檔案,

如何獲取呢?可以用如下命令獲取

  1. $chmod 777 /data/anr

  2. $rm /data/anr/traces.txt

  3. $ps

  4. $kill -3 PID

  5. adbpull data/anr/traces.txt ./mytraces.txt

從trace.txt檔案,看到最多的是如下的資訊:

-----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)

說明主執行緒在等待下條訊息進入訊息佇列

八:Thread狀態

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:如何調查並解決ANR

1:首先分析log

2: 從trace.txt檔案檢視呼叫stack.

3: 看程式碼

4:仔細檢視ANR的成因(iowait?block?memoryleak?)

十:案例

案例1:關鍵詞: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%kernel100%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$FairSync.lock(ReentrantLock.java:200) atjava.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:261) atandroid.database.sqlite.SQLiteDatabase.lock(SQLiteDatabase.java:378) atandroid.database.sqlite.SQLiteCursor.<init>(SQLiteCursor.java:222) atandroid.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:53) atandroid.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1356) atandroid.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1235) atandroid.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1189) atandroid.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1271) atcom.android.email.provider.EmailProvider.query(EmailProvider.java:1098) atandroid.content.ContentProvider$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$2500(MessageView.java:98) atcom.android.email.activity.MessageView$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$300(AsyncTask.java:127) atandroid.os.AsyncTask$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,說明當前系統在忙於I/O,因此資料庫操作被阻塞

原來:

        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)){

           newThread(){

               @Override

               publicvoidrun(){

                  mLegacyController.processPendingActions(message.mAccountKey);

               }

           }.start();

        }

解決後:

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();

案例2:關鍵詞:在UI執行緒進行網路資料的讀寫

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%kernelTOTAL: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)

關於網路連線,再設計的時候可以設定個timeout的時間或者放入獨立的執行緒來處理。

案例3:

關鍵詞: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)記憶體不足導致block在建立bitmap上

**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

解決:如果機器的記憶體族,可以修改虛擬機器的記憶體為36M或更大,不過最好是複查程式碼,檢視哪些記憶體沒有釋放

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http://www.eoeandroid.com/forum.php?mod=viewthread&tid=165974

Log的產生大家都知道 , 大家也都知道通過DDMS來看log , 但什麼時候會產生log檔案呢 ?一般在如下幾種情況會產生log檔案 。 1,程式異常退出 , uncaused exception 2,程式強制關閉 ,Force Closed (簡稱FC) 3,程式無響應 , Application No Response (簡稱ANR) , 順便,一般主執行緒超過5秒麼有處理就會ANR 4,手動生成 。 拿到一個日誌檔案,要分成多段來看 。 log檔案很長,其中包含十幾個小單元資訊,但不要被嚇到 ,事實上他主要由三大塊兒組成 。 1,系統基本資訊 ,包括 記憶體,CPU ,程序佇列 ,虛擬記憶體 , 垃圾回收等資訊 。------ MEMORY INFO (/proc/meminfo) ------ ------ CPU INFO (top -n 1 -d 1 -m 30 -t) ------ ------ PROCRANK (procrank) ------ ------ VIRTUAL MEMORY STATS (/proc/vmstat) ------ ------ VMALLOC INFO (/proc/vmallocinfo) ------ 格式如下: ------ MEMORY INFO (/proc/meminfo) ------ MemTotal:         347076 kB MemFree:           56408 kB Buffers:            7192 kB Cached:           104064 kB SwapCached:            0 kB Active:           192592 kB Inactive:          40548 kB Active(anon):     129040 kB Inactive(anon):     1104 kB Active(file):      63552 kB Inactive(file):    39444 kB Unevictable:        7112 kB Mlocked:               0 kB SwapTotal:             0 kB SwapFree:              0 kB Dirty:                44 kB Writeback:             0 kB AnonPages:        129028 kB Mapped:            73728 kB Shmem:              1148 kB Slab:              13072 kB SReclaimable:       4564 kB SUnreclaim:         8508 kB KernelStack:        3472 kB PageTables:        12172 kB NFS_Unstable:          0 kB Bounce:                0 kB WritebackTmp:          0 kB CommitLimit:      173536 kB Committed_AS:    7394524 kB VmallocTotal:     319488 kB VmallocUsed:       90752 kB VmallocChunk:     181252 kB 2,時間資訊 , 也是我們主要分析的資訊 。 ------ VMALLOC INFO (/proc/vmallocinfo) ------ ------ EVENT INFO (/proc/vmallocinfo) ------ 格式如下: ------ SYSTEM LOG (logcat -b system -v time -d *:v) ------ 01-15 16:41:43.671 W/PackageManager( 2466): Unknown permission com.wsomacp.permission.PROVIDER in package com.android.mms 01-15 16:41:43.671 I/ActivityManager( 2466): Force stopping package com.android.mms uid=10092 01-15 16:41:43.675 I/UsageStats( 2466): Something wrong here, didn't expect com.sec.android.app.twlauncher to be paused 01-15 16:41:44.108 I/ActivityManager( 2466): Start proc com.sec.android.widgetapp.infoalarm for service com.sec.android.widgetapp.infoalarm/.engine.DataService: pid=20634 uid=10005 gids={3003, 1015, 3002} 01-15 16:41:44.175 W/ActivityManager( 2466): Activity pause timeout for HistoryRecord{48589868 com.sec.android.app.twlauncher/.Launcher} 01-15 16:41:50.864 I/KeyInputQueue( 2466): Input event 01-15 16:41:50.866 D/KeyInputQueue( 2466): screenCaptureKeyFlag setting 0 01-15 16:41:50.882 I/PowerManagerService( 2466): Ulight 0->7|0 01-15 16:41:50.882 I/PowerManagerService( 2466): Setting target 2: cur=0.0 target=70 delta=4.6666665 nominalCurrentValue=0 01-15 16:41:50.882 I/PowerManagerService( 2466): Scheduling light animator! 01-15 16:41:51.706 D/PowerManagerService( 2466): enableLightSensor true 01-15 16:41:51.929 I/KeyInputQueue( 2466): Input event 01-15 16:41:51.933 W/WindowManager( 2466): No focus window, dropping: KeyEvent{action=0 code=26 repeat=0 meta=0 scancode=26 mFlags=9} 3,虛擬機器資訊 , 包括程序的,執行緒的跟蹤資訊,這是用來跟蹤程序和執行緒具體點的好地方 。  ------ VM TRACES JUST NOW (/data/anr/traces.txt.bugreport: 2011-01-15 16:49:02) ------ ------ VM TRACES AT LAST ANR (/data/anr/traces.txt: 2011-01-15 16:49:02) ------ 格式如下 : ----- pid 21161 at 2011-01-15 16:49:01 ----- Cmd line: com.android.mms DALVIK THREADS: "main" prio=5 tid=1 NATIVE   | group="main" sCount=1 dsCount=0 s=N obj=0x4001d8d0 self=0xccc8   | sysTid=21161 nice=0 sched=0/0 cgrp=default handle=-1345017808   | schedstat=( 4151552996 5342265329 10995 )   at android.media.MediaPlayer._reset(Native Method)   at android.media.MediaPlayer.reset(MediaPlayer.java:1218)   at android.widget.VideoView.release(VideoView.java:499)   at android.widget.VideoView.access$2100(VideoView.java:50)   at android.widget.VideoView$6.surfaceDestroyed(VideoView.java:489)   at android.view.SurfaceView.reportSurfaceDestroyed(SurfaceView.java:572)   at android.view.SurfaceView.updateWindow(SurfaceView.java:476)   at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:206)   at android.view.View.dispatchDetachedFromWindow(View.java:6082)   at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1156)   at android.view.ViewGroup.removeAllViewsInLayout(ViewGroup.java:2296)   at android.view.ViewGroup.removeAllViews(ViewGroup.java:2254)   at com.android.mms.ui.SlideView.reset(SlideView.java:687)   at com.android.mms.ui.SlideshowPresenter.presentSlide(SlideshowPresenter.java:189)   at com.android.mms.ui.SlideshowPresenter$3.run(SlideshowPresenter.java:531)   at android.os.Handler.handleCallback(Handler.java:587)   at android.os.Handler.dispatchMessage(Handler.java:92)   at android.os.Looper.loop(Looper.java:123)   at android.app.ActivityThread.main(ActivityThread.java:4627)   at java.lang.reflect.Method.invokeNative(Native Method)   at java.lang.reflect.Method.invoke(Method.java:521)   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)   at dalvik.system.NativeStart.main(Native Method) --------------------------------------------------------------------------------------------------------------------------------------- 閒話少說, 我總結了觀察log檔案的基本步驟 。 1,如果是ANR問題 , 則搜尋“ANR”關鍵詞 。 快速定位到關鍵事件資訊 。 2,如果是ForceClosed 和其它異常退出資訊,則搜尋"Fatal" 關鍵詞, 快速定位到關鍵事件資訊 。 3,定位到關鍵事件資訊後 , 如果資訊不夠明確的,再去搜索應用程式包的虛擬機器資訊 ,檢視具體的程序和執行緒跟蹤的日誌,來定位到程式碼 。  用這種方法,出現問題,根本不需要斷點除錯 , 直接定位到問題,屢試不爽 。  下面,我們就開始來分析這個例子的log 。 開啟log檔案 , 由於是ANR錯誤,因此搜尋"ANR " , 為何要加空格呢,你加上和去掉比較一下就知道了 。 可以遮蔽掉不少儲存到anr.log檔案的無效資訊 。  定位到關鍵的事件資訊如下: 01-15 16:49:02.433 E/ActivityManager( 2466): ANR in com.android.mms (com.android.mms/.ui.SlideshowActivity) 01-15 16:49:02.433 E/ActivityManager( 2466): Reason: keyDispatchingTimedOut 01-15 16:49:02.433 E/ActivityManager( 2466): Load: 0.6 / 0.61 / 0.42 01-15 16:49:02.433 E/ActivityManager( 2466): CPU usage from 1337225ms to 57ms ago: 01-15 16:49:02.433 E/ActivityManager( 2466):   sensorserver_ya: 8% = 0% user + 8% kernel / faults: 40 minor ...... 01-15 16:49:02.433 E/ActivityManager( 2466):  -com.android.mms: 0% = 0% user + 0% kernel 01-15 16:49:02.433 E/ActivityManager( 2466):  -flush-179:8: 0% = 0% user + 0% kernel 01-15 16:49:02.433 E/ActivityManager( 2466): TOTAL: 25% = 10% user + 14% kernel + 0% iowait + 0% irq + 0% softirq 01-15 16:49:02.436 I/        ( 2466): dumpmesg > "/data/log/dumpstate_app_anr.log" 我們用自然語言來描述一下日誌,這也算是一種能力吧 。  01-15 16:49:02.433 E/ActivityManager( 2466): ANR in com.android.mms (com.android.mms/.ui.SlideshowActivity) 翻譯:在16:49分2秒433毫秒的時候 ActivityManager (程序號為2466) 發生瞭如下錯誤:com.android.mms包下面的.ui.SlideshowActivity 無響應 。 01-15 16:49:02.433 E/ActivityManager( 2466): Reason: keyDispatchingTimedOut 翻譯:原因 , keyDispatchingTimeOut - 按鍵分配超時  01-15 16:49:02.433 E/ActivityManager( 2466): Load: 0.6 / 0.61 / 0.42 翻譯:5分鐘,10分鐘,15分鐘內的平均負載分別為:0.6 , 0.61 , 0.42 在這裡我們大概知道問題是什麼了,結合我們之前的操作流程,我們知道問題是在點選按鈕某時候可能處理不過來按鈕事件,導致超時無響應 。那麼現在似乎已經可以進行工作了 。 我們知道Activity中是通過過載dispatchTouchEvent(MotionEvent ev)來處理點選螢幕事件  。 然後我們可以順藤摸瓜,一點點分析去查詢原因 。 但這樣夠了麼 ? 其實不夠 , 至少我們不能準確的知道到底問題在哪兒 , 只是猜測 ,比如這個應用程式中,我就在順藤摸瓜的時候發現了多個IO操作的地方都在主執行緒中,可能引起問題,但不好判斷到底是哪個  ,所以我們目前掌握的資訊還不夠 。  於是我們再分析虛擬機器資訊 , 搜尋“Dalvik Thread”關鍵詞,快速定位到本應用程式的虛擬機器資訊日誌,如下: ----- pid 2922 at 2011-01-13 13:51:07 ----- Cmd line: com.android.mms DALVIK THREADS: "main" prio=5 tid=1 NATIVE   | group="main" sCount=1 dsCount=0 s=N obj=0x4001d8d0 self=0xccc8   | sysTid=2922 nice=0 sched=0/0 cgrp=default handle=-1345017808   | schedstat=( 3497492306 15312897923 10358 )   at android.media.MediaPlayer._release(Native Method)   at android.media.MediaPlayer.release(MediaPlayer.java:1206)   at android.widget.VideoView.stopPlayback(VideoView.java:196)   at com.android.mms.ui.SlideView.stopVideo(SlideView.java:640)   at com.android.mms.ui.SlideshowPresenter.presentVideo(SlideshowPresenter.java:443)   at com.android.mms.ui.SlideshowPresenter.presentRegionMedia(SlideshowPresenter.java:219)   at com.android.mms.ui.SlideshowPresenter$4.run(SlideshowPresenter.java:516)   at android.os.Handler.handleCallback(Handler.java:587)   at android.os.Handler.dispatchMessage(Handler.java:92)   at android.os.Looper.loop(Looper.java:123)   at android.app.ActivityThread.main(ActivityThread.java:4627)   at java.lang.reflect.Method.invokeNative(Native Method)   at java.lang.reflect.Method.invoke(Method.java:521)   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)   at dalvik.system.NativeStart.main(Native Method) "Binder Thread #3" prio=5 tid=11 NATIVE   | group="main" sCount=1 dsCount=0 s=N obj=0x4837f808 self=0x242280   | sysTid=3239 nice=0 sched=0/0 cgrp=default handle=2341032   | schedstat=( 32410506 932842514 164 )   at dalvik.system.NativeStart.run(Native Method) "AsyncQueryWorker" prio=5 tid=9 WAIT   | group="main" sCount=1 dsCount=0 s=N obj=0x482f4b80 self=0x253e10   | sysTid=3236 nice=0 sched=0/0 cgrp=default handle=2432120   | schedstat=( 3225061 26561350 27 )   at java.lang.Object.wait(Native Method)   - waiting on <0x482f4da8> (a android.os.MessageQueue)   at java.lang.Object.wait(Object.java:288)   at android.os.MessageQueue.next(MessageQueue.java:146)   at android.os.Looper.loop(Looper.java:110)   at android.os.HandlerThread.run(HandlerThread.java:60) "Thread-9" prio=5 tid=8 WAIT   | group="main" sCount=1 dsCount=0 s=N obj=0x4836e2b0 self=0x25af70   | sysTid=2929 nice=0 sched=0/0 cgrp=default handle=2370896   | schedstat=( 130248 4389035 2 )   at java.lang.Object.wait(Native Method)   - waiting on <0x4836e240> (a java.util.ArrayList)   at java.lang.Object.wait(Object.java:288)   at com.android.mms.data.Contact$ContactsCache$TaskStack$1.run(Contact.java:488)   at java.lang.Thread.run(Thread.java:1096) "Binder Thread #2" prio=5 tid=7 NATIVE   | group="main" sCount=1 dsCount=0 s=N obj=0x482f8ca0 self=0x130fd0   | sysTid=2928 nice=0 sched=0/0 cgrp=default handle=1215968   | schedstat=( 40610049 1837703846 195 )   at dalvik.system.NativeStart.run(Native Method) "Binder Thread #1" prio=5 tid=6 NATIVE   | group="main" sCount=1 dsCount=0 s=N obj=0x482f4a78 self=0x128a50   | sysTid=2927 nice=0 sched=0/0 cgrp=default handle=1201352   | schedstat=( 40928066 928867585 190 )   at dalvik.system.NativeStart.run(Native Method) "Compiler" daemon prio=5 tid=5 VMWAIT   | group="system" sCount=1 dsCount=0 s=N obj=0x482f1348 self=0x118960   | sysTid=2926 nice=0 sched=0/0 cgrp=default handle=1149216   | schedstat=( 753021350 3774113668 6686 )   at dalvik.system.NativeStart.run(Native Method) "JDWP" daemon prio=5 tid=4 VMWAIT   | group="system" sCount=1 dsCount=0 s=N obj=0x482f12a0 self=0x132940   | sysTid=2925 nice=0 sched=0/0 cgrp=default handle=1255680   | schedstat=( 2827103 29553323 19 )   at dalvik.system.NativeStart.run(Native Method) "Signal Catcher" daemon prio=5 tid=3 RUNNABLE   | group="system" sCount=0 dsCount=0 s=N obj=0x482f11e8 self=0x135988   | sysTid=2924 nice=0 sched=0/0 cgrp=default handle=1173688   | schedstat=( 11793815 12456169 7 )   at dalvik.system.NativeStart.run(Native Method) "HeapWorker" daemon prio=5 tid=2 VMWAIT   | group="system" sCount=1 dsCount=0 s=N obj=0x45496028 self=0x135848   | sysTid=2923 nice=0 sched=0/0 cgrp=default handle=1222608   | schedstat=( 79049792 1520840200 95 )   at dalvik.system.NativeStart.run(Native Method) ----- end 2922 ----- 每一段都是一個執行緒 ,當然我們還是看執行緒號為1的主執行緒了。通過分析發現關鍵問題是這樣:   at com.android.mms.ui.SlideshowPresenter$3.run(SlideshowPresenter.java:531) 定位到程式碼: mHandler.post(new Runnable() {                     public void run() {                         try {                             presentRegionMedia(view, (RegionMediaModel) model, dataChanged);                         } catch (OMADRMException e) {                             Log.e(TAG, e.getMessage(), e);                             Toast.makeText(mContext,                                     mContext.getString(R.string.insufficient_drm_rights),                                     Toast.LENGTH_SHORT).show();                         } catch (IOException e){                             Log.e(TAG, e.getMessage(), e);                             Toast.makeText(mContext,                                     mContext.getString(R.string.insufficient_drm_rights),                                     Toast.LENGTH_SHORT).show();                                                  }                     } 很清楚了, Handler.post 方法之後執行時間太長的問題 。 繼續看presentRegionMedia(view, (RegionMediaModel) model, dataChanged);方法 , 發現最終是呼叫的framework 中MediaPlayer.stop方法 。 至此,我們的日誌分析算是告一段落 。 可以開始思考解決辦法了

--------------------- 本文來自 Dartagnan 的CSDN 部落格 ,全文地址請點選:https://blog.csdn.net/dadoneo/article/details/8270107?utm_source=copy