浅谈ANR及如何分析解决ANR(3)

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.<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，说明当前系统在忙于I/O，因此数据库操作被阻塞
原来：

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:在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，再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