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Andriod上ANR介绍及ANR问题解决方法

 
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    发布时间:2014-4-4  


    本文导语:  Andriod ANR(Application Not Responding)定义 在Android上,如果你的应用程序有一段时间响应不够灵敏,系统会向用户显示一个对话框,这个对话框称作应用程序无响应(ANR:Application Not Responding)对话框。用户可以选...

   Andriod ANR(Application Not Responding)定义

   在Android上,如果你的应用程序有一段时间响应不够灵敏,系统会向用户显示一个对话框,这个对话框称作应用程序无响应(ANR:Application Not

Responding)对话框。用户可以选择“等待”而让程序继续运行,也可以选择“强制关闭”。所以一个流畅的合理的应用程序中不能出现anr,而让用户每次都

要处理这个对话框。因此,在程序里对响应性能的设计很重要,这样系统不会显示ANR给用户。默认情况下,在android中Activity的最长执行时间是5秒,

BroadcastReceiver的最长执行时间则是10秒。

  Andriod  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


  Andriod  ANR 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文件中。
   staticfinal int KEY_DISPATCHING_TIMEOUT = 5*1000

  Andriod  ANR为超时原因
   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

   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

   Andriod UI线程
   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

  Andriod 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 */

 查找并解决Andriod 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?)

  Andriod  ANR案例
案例1:
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$2500(MessageView.java:98)
atcom.android.email.activity.MessageView$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)){
  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();


案例2: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,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:

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

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