Android ANR 分析解决方法-白红宇

Android ANR 分析解决方法

阅读量：6705 次

发布时间：2019-06-25

本文共 12380 字，大约阅读时间需要 41 分钟。

转：http://www.cnblogs.com/purediy/p/3225060.html

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

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:

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，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：

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
)
         
       