Android adb logcat用法详解 / 憋错料

1. 解析 adb logcat 的帮助信息

在命令行中输入 adb logcat --help 命令, 就可以显示该命令的帮助信息;

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[email protected]:~$ adb logcat --help
Usage: logcat [options] [filterspecs]
options include:
-s Set default filter to silent.
Like specifying filterspec ‘*:s‘
-f <filename> Log to file. Default to stdout
-r [<kbytes>] Rotate log every kbytes. (16 if unspecified). Requires -f
-n <count> Sets max number of rotated logs to <count>, default 4
-v <format> Sets the log print format, where <format> is one of:
brief process tag thread raw time threadtime long
-c clear (flush) the entire log and exit
-d dump the log and then exit (don‘t block)
-t <count> print only the most recent <count> lines (implies -d)
-g get the size of the log‘s ring buffer and exit
-b <buffer> Request alternate ring buffer, ‘main‘, ‘system‘, ‘radio‘
or ‘events‘. Multiple -b parameters are allowed and the
results are interleaved. The default is -b main -b system.
-B output the log in binary
filterspecs are a series of
<tag>[:priority]
where <tag> is a log component tag (or * for all) and priority is:
V Verbose
D Debug
I Info
W Warn
E Error
F Fatal
S Silent (supress all output)
‘*‘ means ‘*:d‘ and <tag> by itself means <tag>:v
If not specified on the commandline, filterspec is set from ANDROID_LOG_TAGS.
If no filterspec is found, filter defaults to ‘*:I‘
If not specified with -v, format is set from ANDROID_PRINTF_LOG
or defaults to "brief"

adb logcat 命令格式 : adb logcat [选项] [过滤项], 其中选项和过滤项在中括号 [] 中, 说明这是可选的;

(1) 选项解析

选项解析 :

-- "-s"选项 : 设置输出日志的标签, 只显示该标签的日志;

--"-f"选项 : 将日志输出到文件, 默认输出到标准输出流中, -f 参数执行不成功;

--"-r"选项 : 按照每千字节输出日志, 需要 -f 参数, 不过这个命令没有执行成功;

--"-n"选项 : 设置日志输出的最大数目, 需要 -r 参数, 这个执行感觉跟 adb logcat 效果一样;

--"-v"选项 : 设置日志的输出格式, 注意只能设置一项;

--"-c"选项 : 清空所有的日志缓存信息;

--"-d"选项 : 将缓存的日志输出到屏幕上, 并且不会阻塞;

--"-t"选项 : 输出最近的几行日志, 输出完退出, 不阻塞;

--"-g"选项 : 查看日志缓冲区信息;

--"-b"选项 : 加载一个日志缓冲区, 默认是 main, 下面详解;

--"-B"选项 : 以二进制形式输出日志;

输出指定标签内容 :

-- "-s"选项 : 设置默认的过滤器, 如我们想要输出 "System.out" 标签的信息, 就可以使用adb
logcat -s System.out 命令;

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[email protected]:~$ adb logcat -s System.out
--------- beginning of /dev/log/system
--------- beginning of /dev/log/main
I/System.out(22930): GSM -91
I/System.out(22930): SignalStrength issssssssss : -91
I/System.out(22930): GSM -91
I/System.out(22930): SignalStrength issssssssss : -91
I/System.out(22930): Supervisor Thread
I/System.out(22930): Got run mode

输出日志信息到文件 :

-- "-f"选项 : 该选向后面跟着输入日志的文件, 使用adb logcat -f /sdcard/log.txt 命令, 注意这个log文件是输出到手机上，需要指定合适的路径。

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[email protected]:~$ adb logcat -f /sdcard/log.txt

这个参数对对不能一直用电脑连着手机收集日志的场景非常有用，其实android shell下也有一个相同参数的logcat命令。使用如下命令可以执行后断开PC和手机持续收集LOG。

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[email protected]$ adb shell
[email protected]$ logcat -f /sdcard/log.txt & #这里的&符号表示后台执行，别少了。
[email protected]$ exit

注：

（1）以上[email protected]$ 指在pc的shell终端执行后边的命令， [email protected]$ 表示在手机shell中执行后边的命令l

（2）一定注意合适的时候需要停止掉以上命令，否则再次使用相同命令的时候，就会有两个logcat写同一个文件了

停止方法: adb shell kill -9 <logcat_pid>

其中logcat_pid 通过如下命令获取

adb shell ps | grep logcat # linux 平台

adb shell ps | findstr "logcat" #Windows平台

-- ">"输出 : ">" 后面跟着要输出的日志文件, 可以将 logcat 日志输出到文件中, 使用adb logcat > log 命令, 使用more
log 命令查看日志信息;

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[email protected]:~$ adb logcat > log
^C
[email protected]:~$ more log
--------- beginning of /dev/log/system
V/ActivityManager( 500): We have pending thumbnails: null
V/ActivityManager( 500): getTasks: max=1, flags=0, receiver=null
V/ActivityManager( 500): com.android.settings/.Settings: task=TaskRecord{42392278 #448 A com.android.settings U 0}
V/ActivityManager( 500): We have pending thumbnails: null

-- " -d -f <log>" 组合命令：可以将日志保存到手机上的指定位置，对不能一直用电脑连着手机收集日志的场景非常有用。

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adb logcat -d -v /sdcard/mylog.txt

指定 logcat 的日志输出格式 :

-- "-v"选项 : 使用adb logcat -v time 命令, 可以啥看日志的输出时间;

使用adb logcat -v threadtime 命令, 可以啥看日志的输出时间和线程信息;

-- "brief"格式 : 这是默认的日志格式" 优先级 / 标签 (进程ID) : 日志信息 ", 使用adb
logcat -v prief 命令;

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[email protected]:~$ adb logcat -v brief
--------- beginning of /dev/log/system
D/PowerManagerService( 500): handleSandman: canDream=true, mWakefulness=Awake
D/PowerManagerService( 500): releaseWakeLockInternal: lock=1101267696, flags=0x0

-- "process"格式 : "
优先级 (进程ID) : 日志信息 ", 使用adb
logcat -v process 命令;

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[email protected]:~$ adb logcat -v process
--------- beginning of /dev/log/system
D( 500) MobileDataStateReceiver received: ACTION_ANY_DATA_CONNECTION_STATE_CHANGED_MOBILE [wap] (MobileDataStateTracker)
V( 500) Broadcast: Intent { act=android.intent.action.ANY_DATA_STATE_MOBILE flg=0x10 (has extras) } ordered=true userid=0 (ActivityManager)
D( 500) wap: Intent from SIM 0, current SIM 0, current DataState DISCONNECTED (MobileDataStateTracker)
D( 500) wap: wap setting isAvailable to false (MobileDataStateTracker)
D( 500) wap: Received state=DISCONNECTED, old=DISCONNECTED, reason=dataDetached (MobileDataStateTracker)
D( 500) BDC-Calling finishReceiver: IIntentReceiver=41c46ba0 (ActivityThread)

-- "tag"格式 : "
优先级 / 标签 : 日志信息", 使用adb
logcat -v tag 命令;

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[email protected]:~$ adb logcat -v tag
--------- beginning of /dev/log/system
I/PowerManagerService: setBrightness mButtonLight 0.
D/PowerManagerService: updateScreenStateLocked: mDisplayReady=true, newScreenState=2, mWakefulness=1, mWakeLockSummary=0x1, mUserActivitySummary=0x1, mBootCompleted=true
D/PowerManagerService: handleSandman: canDream=true, mWakefulness=Awake

-- "thread"格式 : "
优先级 ( 进程ID : 线程ID) 标签 : 日志内容 ", 使用adb
logcat -v tag 命令;

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[email protected]:~$ adb logcat -v thread
--------- beginning of /dev/log/system
V( 500: 2141) getTasks: max=1, flags=0, receiver=null
V( 500: 2141) com.lewa.launcher/.Launcher: task=TaskRecord{41dccc20 #425 A com.lewa.launcher U 0}
V( 500: 2141) We have pending thumbnails: null
V( 500: 2140) getTasks: max=1, flags=0, receiver=null

-- "raw"格式 :
只输出日志信息, 不附加任何其他信息, 如优先级标签等, 使用adb logcat -v raw 命令;

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[email protected]:~$ adb logcat -v raw
--------- beginning of /dev/log/system
notifications are enabled for com.kindroid.security
Assigned score=0 to Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
Native set alarm :Alarm{41e1ca00 type 3 com.kindroid.security}
reset poweroff alarm none

-- "time"格式 : "日期
时间优先级 / 标签 (进程ID) : 进程名称 : 日志信息 ", 使用adb
logcat -v time 命令;

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[email protected]:~$ adb logcat -v time
--------- beginning of /dev/log/system
04-25 17:18:13.019 V/ActivityManager( 500): Broadcast sticky: Intent { act=android.intent.action.SIG_STR flg=0x10 (has extras) } ordered=false userid=-1
04-25 17:18:13.157 V/NotificationService( 500): enqueueNotificationInternal: pkg=com.kindroid.security id=1020 notification=Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
04-25 17:18:13.158 V/NotificationService( 500): notifications are enabled for com.kindroid.security
04-25 17:18:13.158 V/NotificationService( 500): Assigned score=0 to Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
04-25 17:18:13.555 V/ActivityManager( 500): getTasks: max=1, flags=0, receiver=null

-- "long"格式:"
[ 日期时间进程ID : 线程ID 优先级 / 标签] 日志信息 ", 输出以上提到的所有的头信息, 使用adb
logcat -v long 命令;

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[email protected]:~$ adb logcat -v long
--------- beginning of /dev/log/system
[ 04-25 17:21:18.118 500:0x2fe V/ActivityManager ]
We have pending thumbnails: null
[ 04-25 17:21:18.696 593:0x251 W/ActivityThread ]
Content provider com.android.providers.telephony.TelephonyProvider already published as telephony
[ 04-25 17:21:19.119 500:0x396 V/ActivityManager ]
getTasks: max=1, flags=0, receiver=null

清空日志缓存信息 : 使用 adb
logcat -c 命令, 可以将之前的日志信息清空, 重新开始输出日志信息;

将缓存日志输出 : 使用 adb
logcat -d 命令, 输出命令, 之后推出命令, 不会进行阻塞;

输出最近的日志 : 使用adb logcat -t 5 命令, 可以输出最近的5行日志, 并且不会阻塞;

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[email protected]:~$ adb logcat -t 5
--------- beginning of /dev/log/system
--------- beginning of /dev/log/main
W/ADB_SERVICES(10028): adb: unable to open /proc/10028/oom_adj
D/dalvikvm(23292): threadid=11: created from interp
D/dalvikvm(23292): start new thread
D/dalvikvm(23292): threadid=11: notify debugger
D/dalvikvm(23292): threadid=11 (Thread-24538): calling run()
[email protected]:~$

查看日志缓冲区信息 : 使用 adb
logcat -g 命令;

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[email protected]:~$ adb logcat -g
/dev/log/main: ring buffer is 256Kb (255Kb consumed), max entry is 5120b, max payload is 4076b
/dev/log/system: ring buffer is 256Kb (255Kb consumed), max entry is 5120b, max payload is 4076b
[email protected]:~$

加载日志缓冲区 : 使用 adb
logcat -b 缓冲区类型命令;

-- Android中的日志缓冲区 : system缓冲区 - 与系统相关的日志信息, radio缓冲区 - 广播电话相关的日志信息, events缓冲区 - 事件相关的日志信息, main缓冲区 - 默认的缓冲区;

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[email protected]:~$ adb logcat -b radio -t 5
D/PHONE (23599): [GeminiDataSubUtil] UAPP_C6-4
D/GSM (23599): [GDCT][simId1]apnType = default
D/GSM (23599): [GDCT][simId1]isDataAllowed: not allowed due to - gprs= 1 - SIM not loaded - desiredPowerState= false
D/GSM (23599): [GDCT][simId1]isDataPossible(default): possible=false isDataAllowed=false apnTypePossible=true apnContextisEnabled=true apnContextState()=IDLE
I/MUXD (23591): [gsm0710muxd] 3426:main(): Frames received/dropped: 18242/0
[email protected]:~$
[email protected]:~$ adb logcat -b main -t 5
D/NotificationService( 500): notification.sound=null
D/NotificationService( 500): mDmLock=false
I/ATCIJ (16576): Couldn‘t find ‘atci-serv-fw‘ socket; retrying after timeout
W/ADB_SERVICES( 246): create_local_service_socket() name=shell:export ANDROID_LOG_TAGS="" ; exec logcat -b main -t 5
W/ADB_SERVICES(16815): adb: unable to open /proc/16815/oom_adj
[email protected]:~$
[email protected]octopus:~$ adb logcat -b system -t 5
D/PowerManagerService( 500): updateScreenStateLocked: mDisplayReady=true, newScreenState=0, mWakefulness=0, mWakeLockSummary=0x1, mUserActivitySummary=0x0, mBootCompleted=true
D/PowerManagerService( 500): handleSandman: canDream=false, mWakefulness=Asleep
V/NotificationService( 500): enqueueNotificationInternal: pkg=com.kindroid.security id=1020 notification=Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
V/NotificationService( 500): notifications are enabled for com.kindroid.security
V/NotificationService( 500): Assigned score=0 to Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
[email protected]:~$
[email protected]:~$ adb logcat -b event -t 5
Unable to open log device ‘/dev/log/event‘: No such file or directory
[email protected]:~$ adb logcat -b events -t 5
I/notification_cancel( 500): [com.kindroid.security,1026,NULL,0,0,64]
I/notification_enqueue( 500): [com.kindroid.security,1020,NULL,0,Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])]
I/notification_cancel( 500): [com.kindroid.security,1026,NULL,0,0,64]
I/notification_enqueue( 500): [com.kindroid.security,1020,NULL,0,Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])]
I/notification_cancel( 500): [com.kindroid.security,1026,NULL,0,0,64]
[email protected]:~$

以二进制形式输出日志 : 使用 adb
logcat -B 命令;

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[email protected]:~$ adb logcat -B -t 5
O??_?3ZS?4gps_mt3326nmea_reader_parse: line = 1218GPS get accuracy failed, fix mode:1
^??_?3ZS?=gps_mt3326nmea_reader_addc: line = 1331the structure include nmea_cb address is 0x658cc8e8
H??_?3ZSEGEgps_mt3326nmea_reader_addc: line = 1332nmea_cb address is 0x5d2fe279
i???3ZS?)>ADB_SERVICEScreate_local_service_socket() name=shell:export ANDROID_LOG_TAGS="" ; exec logcat -B -t 5
7*E*E?3ZSo?YADB_SERVICESadb: unable to open /proc/17706/oom_adj

(2) 过滤项解析

过滤项格式 : <tag>[:priority] , 标签:日志等级, 默认的日志过滤项是 " *:I " ;

-- V : Verbose (明细);

-- D : Debug (调试);

-- I : Info (信息);

-- W : Warn (警告);

-- E : Error (错误);

-- F: Fatal (严重错误);

-- S : Silent(Super all output) (最高的优先级, 可能不会记载东西);

过滤指定等级日志 : 使用 adb logcat 10 *:E 命令, 显示 Error 以上级别的日志;

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[email protected]:~$ adb logcat *:E
Note: log switch off, only log_main and log_events will have logs!
--------- beginning of /dev/log/main
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
E/dalvikvm( 756): GC_CONCURRENT freed 1809K, 27% free 19489K/26695K, paused 16ms+5ms, total 109ms
E/WifiHW ( 441): wifi_send_command : SCAN ; interface index=0;
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
E/dalvikvm( 756): GC_CONCURRENT freed 1820K, 27% free 19490K/26695K, paused 16ms+3ms, total 102ms
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

过滤指定标签等级日志 : 使用 adb logcat WifiHW:D *:S 命令进行过滤;

-- 命令含义 : 输出10条日志, 日志是标签为 WifiHW, 并且优先级 Debug(调试) 等级以上的级别的日志;

--注意 *:S : 如果没有 *S 就会输出错误;

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[email protected]:~$ adb logcat WifiHW:D *:S
Note: log switch off, only log_main and log_events will have logs!
--------- beginning of /dev/log/main
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

可以同时设置多个过滤器 : 使用adb logcat WifiHW:D dalvikvm:I *:S 命令, 输出 WifiHW 标签的 Debug
以上级别和 dalvikvm 标签的 Info 以上级别的日志;

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[email protected]:~$ adb logcat WifiHW:D dalvikvm:I *:S
Note: log switch off, only log_main and log_events will have logs!
--------- beginning of /dev/log/main
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
E/dalvikvm( 756): GC_CONCURRENT freed 1820K, 27% free 19490K/26695K, paused 17ms+2ms, total 110ms
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
E/dalvikvm( 756): GC_CONCURRENT freed 1810K, 27% free 19489K/26695K, paused 17ms+5ms, total 108ms
E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;