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Android Log Tag含义，androidlogtag含义
在分析Android问题的时候重要的手段之一就是分析log，在events.log中有很多系统log，其中有些log的含义并不是很了解，下面就是从安卓源码中得到的系统log的tag。
关于Tag的说明如下：以 “30005 am_create_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Action|3),(MIME Type|3),(URI|3),(Flags|1|5)” 为例，
其中：
- 30005 ：相当于是am_create_activity这个tag的索引或者标识。不会出现在events.txt中。
- am_create_activity：TAG名字
- 后面用()括起来的相当于是这个log的一些信息，以(User|1|5)为例，User表示信息名字，User表示UID，1表示在打印出的log中该信息的数据类型，5表示该数据的单位。
数据类型有：
- 1：int
- 2：long
- 3：string
- 4：list
- 5：float
数据的单位有：
- 1：Number of objects
- 2：Number of bytes
- 3：Number of milliseconds
- 4：Number of allocations
- 5：Id
- 6：Percent
所以(User|1|5)表示的意思是：这项信息表示的是User，在Linux即相当于UID，信息的数据类型为1，即int，数据的单位为5，即Id。其他的类似。
一个实际的log如下：
10-31 17:53:38.288 1232 2211 I am_create_activity: [0,208381599,127,cn.company.photoeditor/com.android.gallery3d.filtershow.FilterShowActivity,android.intent.action.EDIT,image/*,content://media/external/images/media/4427,1]，表示的含义即为：
- 这是一个表示activity创建的log
- 程序的UID为0
- 要创建的该activity的TOKEN为208381599
- 该动作所处的Task ID为127
- 所要创建的activity组件名为 cn.company.photoeditor/com.android.gallery3d.filtershow.FilterShowActivity
- 创建该activity消息中的action为android.intent.action.EDIT，MIME TYPE为image/*，URI为content://media/external/images/media/4427，附带的flag为1
下面是源码的中tag定义文件：
service/core/java/com/android/server/am/EventLogTags.logtags：
# See system/core/logcat/event.logtags for a description of the format of this file. option java_package com.android.server.am 2719 configuration_changed (config mask|1|5) 2721 cpu (total|1|6),(user|1|6),(system|1|6),(iowait|1|6),(irq|1|6),(softirq|1|6) # ActivityManagerService.systemReady() starts: 3040 boot_progress_ams_ready (time|2|3) # ActivityManagerService calls enableScreenAfterBoot(): 3050 boot_progress_enable_screen (time|2|3) # Do not change these names without updating the checkin_events setting in # google3/googledata/wireless/android/provisioning/gservices.config !! # # An activity is being finished: 30001 am_finish_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Reason|3) # A task is being brought to the front of the screen: 30002 am_task_to_front (User|1|5),(Task|1|5) # An existing activity is being given a new intent: 30003 am_new_intent (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Action|3),(MIME Type|3),(URI|3),(Flags|1|5) # A new task is being created: 30004 am_create_task (User|1|5),(Task ID|1|5) # A new activity is being created in an existing task: 30005 am_create_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Action|3),(MIME Type|3),(URI|3),(Flags|1|5) # An activity has been resumed into the foreground but was not already running: 30006 am_restart_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3) # An activity has been resumed and is now in the foreground: 30007 am_resume_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3) # Application Not Responding 30008 am_anr (User|1|5),(pid|1|5),(Package Name|3),(Flags|1|5),(reason|3) # Activity launch time 30009 am_activity_launch_time (User|1|5),(Token|1|5),(Component Name|3),(time|2|3) # Application process bound to work 30010 am_proc_bound (User|1|5),(PID|1|5),(Process Name|3) # Application process died 30011 am_proc_died (User|1|5),(PID|1|5),(Process Name|3) # The Activity Manager failed to pause the given activity. 30012 am_failed_to_pause (User|1|5),(Token|1|5),(Wanting to pause|3),(Currently pausing|3) # Attempting to pause the current activity 30013 am_pause_activity (User|1|5),(Token|1|5),(Component Name|3) # Application process has been started 30014 am_proc_start (User|1|5),(PID|1|5),(UID|1|5),(Process Name|3),(Type|3),(Component|3) # An application process has been marked as bad 30015 am_proc_bad (User|1|5),(UID|1|5),(Process Name|3) # An application process that was bad is now marked as good 30016 am_proc_good (User|1|5),(UID|1|5),(Process Name|3) # Reporting to applications that memory is low 30017 am_low_memory (Num Processes|1|1) # An activity is being destroyed: 30018 am_destroy_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3),(Reason|3) # An activity has been relaunched, resumed, and is now in the foreground: 30019 am_relaunch_resume_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3) # An activity has been relaunched: 30020 am_relaunch_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3) # The activity's onPause has been called. 30021 am_on_paused_called (User|1|5),(Component Name|3),(Reason|3) # The activity's onResume has been called. 30022 am_on_resume_called (User|1|5),(Component Name|3),(Reason|3) # Kill a process to reclaim memory. 30023 am_kill (User|1|5),(PID|1|5),(Process Name|3),(OomAdj|1|5),(Reason|3) # Discard an undelivered serialized broadcast (timeout/ANR/crash) 30024 am_broadcast_discard_filter (User|1|5),(Broadcast|1|5),(Action|3),(Receiver Number|1|1),(BroadcastFilter|1|5) 30025 am_broadcast_discard_app (User|1|5),(Broadcast|1|5),(Action|3),(Receiver Number|1|1),(App|3) # A service is being created 30030 am_create_service (User|1|5),(Service Record|1|5),(Name|3),(UID|1|5),(PID|1|5) # A service is being destroyed 30031 am_destroy_service (User|1|5),(Service Record|1|5),(PID|1|5) # A process has crashed too many times, it is being cleared 30032 am_process_crashed_too_much (User|1|5),(Name|3),(PID|1|5) # An unknown process is trying to attach to the activity manager 30033 am_drop_process (PID|1|5) # A service has crashed too many times, it is being stopped 30034 am_service_crashed_too_much (User|1|5),(Crash Count|1|1),(Component Name|3),(PID|1|5) # A service is going to be restarted after its process went away 30035 am_schedule_service_restart (User|1|5),(Component Name|3),(Time|2|3) # A client was waiting for a content provider, but its process was lost 30036 am_provider_lost_process (User|1|5),(Package Name|3),(UID|1|5),(Name|3) # The activity manager gave up on a new process taking too long to start 30037 am_process_start_timeout (User|1|5),(PID|1|5),(UID|1|5),(Process Name|3) # Unhandled exception 30039 am_crash (User|1|5),(PID|1|5),(Process Name|3),(Flags|1|5),(Exception|3),(Message|3),(File|3),(Line|1|5) # Log.wtf() called 30040 am_wtf (User|1|5),(PID|1|5),(Process Name|3),(Flags|1|5),(Tag|3),(Message|3) # User switched 30041 am_switch_user (id|1|5) # Activity fully drawn time 30042 am_activity_fully_drawn_time (User|1|5),(Token|1|5),(Component Name|3),(time|2|3) # Activity focused 30043 am_focused_activity (User|1|5),(Component Name|3),(Reason|3) # Stack focus 30044 am_focused_stack (User|1|5),(Focused Stack Id|1|5),(Last Focused Stack Id|1|5),(Reason|3) # Running pre boot receiver 30045 am_pre_boot (User|1|5),(Package|3) # Report collection of global memory state 30046 am_meminfo (Cached|2|2),(Free|2|2),(Zram|2|2),(Kernel|2|2),(Native|2|2) # Report collection of memory used by a process 30047 am_pss (Pid|1|5),(UID|1|5),(Process Name|3),(Pss|2|2),(Uss|2|2),(SwapPss|2|2) # Attempting to stop an activity 30048 am_stop_activity (User|1|5),(Token|1|5),(Component Name|3) # The activity's onStop has been called. 30049 am_on_stop_called (User|1|5),(Component Name|3),(Reason|3) # Report changing memory conditions (Values are ProcessStats.ADJ_MEM_FACTOR* constants) 30050 am_mem_factor (Current|1|5),(Previous|1|5)
services/core/java/com/android/server/Eve