在调试分析Android的过程中,比较常用的地查看EventLog,非常简洁明了地展现当前Activity各种状态,当然不至于此,比如还有window的信息。那么本文就列举以下am相关的tags含义。
本文涉及的源码类有EventLog.java, EventLogTags.java,另外tags格式的定义位于文件/system/etc/event-log-tags
。
如果在终端输入:
logcat -b events
那么会输出大量类似这样的信息:
-
06
-01 13
:44
:55.518 7361 8289
I
am_create_service:
[0,111484394,.StatService,10094,7769]
-
06
-01 13
:44
:55.540 7361 8343
I
am_proc_bound:
[0,3976,com.android.providers.calendar]
-
06
-01 13
:44
:55.599 7361 8033
I
am_create_service:
[0,61349752,.UpdateService,10034,1351]
-
06
-01 13
:44
:55.625 7361 7774
I
am_destroy_service:
[0,61349752,1351]
-
...
通过字面意思,就能得到不少信息量,比如am_create_service,创建service,但是后面括号中内容的具体含义,其实有很高的价值。 接下来通过一张表格来展示含义。
Num | TagName | 格式 | 功能 |
---|---|---|---|
30001 | am_finish_activity | User,Token,TaskID,ComponentName,Reason | |
30002 | am_task_to_front | User,Task | |
30003 | am_new_intent | User,Token,TaskID,ComponentName,Action,MIMEType,URI,Flags | |
30004 | am_create_task | User ,Task ID | |
30005 | am_create_activity | User ,Token ,TaskID ,ComponentName,Action,MIMEType,URI,Flags | |
30006 | am_restart_activity | User ,Token ,TaskID,ComponentName | |
30007 | am_resume_activity | User ,Token ,TaskID,ComponentName | |
30008 | am_anr | User ,pid ,Package Name,Flags ,reason | ANR |
30009 | am_activity_launch_time | User ,Token ,ComponentName,time | |
30010 | am_proc_bound | User ,PID ,ProcessName | |
30011 | am_proc_died | User ,PID ,ProcessName | |
30012 | am_failed_to_pause | User ,Token ,Wanting to pause,Currently pausing | |
30013 | am_pause_activity | User ,Token ,ComponentName | |
30014 | am_proc_start | User ,PID ,UID ,ProcessName,Type,Component | |
30015 | am_proc_bad | User ,UID ,ProcessName | |
30016 | am_proc_good | User ,UID ,ProcessName | |
30017 | am_low_memory | NumProcesses | Lru |
30018 | am_destroy_activity | User ,Token ,TaskID,ComponentName,Reason | |
30019 | am_relaunch_resume_activity | User ,Token ,TaskID,ComponentName | |
30020 | am_relaunch_activity | User ,Token ,TaskID,ComponentName | |
30021 | am_on_paused_called | User ,ComponentName | |
30022 | am_on_resume_called | User ,ComponentName | |
30023 | am_kill | User ,PID ,ProcessName,OomAdj ,Reason | 杀进程 |
30024 | am_broadcast_discard_filter | User ,Broadcast ,Action,ReceiverNumber,BroadcastFilter | |
30025 | am_broadcast_discard_app | User ,Broadcast ,Action,ReceiverNumber,App | |
30030 | am_create_service | User ,ServiceRecord ,Name,UID ,PID | |
30031 | am_destroy_service | User ,ServiceRecord ,PID | |
30032 | am_process_crashed_too_much | User ,Name,PID | |
30033 | am_drop_process | PID | |
30034 | am_service_crashed_too_much | User ,Crash Count,ComponentName,PID | |
30035 | am_schedule_service_restart | User ,ComponentName,Time | |
30036 | am_provider_lost_process | User ,Package Name,UID ,Name | |
30037 | am_process_start_timeout | User ,PID ,UID ,ProcessName | timeout |
30039 | am_crash | User ,PID ,ProcessName,Flags ,Exception,Message,File,Line | Crash |
30040 | am_wtf | User ,PID ,ProcessName,Flags ,Tag,Message | Wtf |
30041 | am_switch_user | id | |
30042 | am_activity_fully_drawn_time | User ,Token ,ComponentName,time | |
30043 | am_focused_activity | User ,ComponentName | |
30044 | am_home_stack_moved | User ,To Front ,Top Stack Id ,Focused Stack Id ,Reason | |
30045 | am_pre_boot | User ,Package | |
30046 | am_meminfo | Cached,Free,Zram,Kernel,Native | 内存 |
30047 | am_pss | Pid, UID, ProcessName, Pss, Uss | 进程 |
下面列举tag可能使用的部分场景:
Activity生命周期相关的方法:
Num | TagName | 格式 | 功能 |
---|---|---|---|
2722 | battery_level | level, voltage, temperature | |
2723 | battery_status | status,health,present,plugged,technology | |
2730 | battery_discharge | duration, minLevel,maxLevel | |
2724 | power_sleep_requested | wakeLocksCleared | 唤醒锁数量 |
2725 | power_screen_broadcast_send | wakelockCount | |
2726 | power_screen_broadcast_done | on, broadcastDuration, wakelockCount | |
2727 | power_screen_broadcast_stop | which,wakelockCount | 系统还没进入ready状态 |
2728 | power_screen_state | offOrOn, becauseOfUser, totalTouchDownTime, touchCycles | |
2729 | power_partial_wake_state | releasedorAcquired, tag |
部分含义:
下面列举tag可能使用的部分场景:
在源码EventLogTags.java中,有大量类似的定义,那么括号中数字是什么含义呢? (以进程启动为例)
-
30014 am_proc_start (User
|1|
5),(PID
|1|
5),(UID
|1|
5),(Process Name
|3),(Type|
3),(Component
|3)
-
am_proc_start之后紧跟着的几个括号,其中括号里的内容格式如下:
-
(
<name>|data type[|data unit])
-
(
<名字>|数据类型[|数据单位])
那么(User|1|5)
==> 名字为User, 数据类型为1,数据单位为5,下面再来看看数据类型
和数据单位
:
数据类型中int和string用得最多.
有了前面的准备知识,再来完整的看看如下语句:
-
am_proc_start (User
|1|
5),(PID
|1|
5),(UID
|1|
5),(Process Name
|3),(Type|
3),(Component
|3)
-
am_proc_start: [0,9227,10002,com.android.browser,content provider,com.android.browser/.provider.BrowserProvider2]
-
含义如下:
进程启动: UserId=0, pid=9227, uid=10002, ProcessName=com.android.browser, 数据类型=ContentProvider, 组件=com.android.browser/.provider.BrowserProvider2