上一章介绍了ANR分析基础知识trace信息，trace信息是ANR分析的必要信息之一，里面包含了ANR发生事件，ANR发生时堆栈信息，线程状态等。

本章介绍一下另外一个必要信息：Event log。

下面信息基于Android 14的代码。

Event log分类

  • am相关信息
  • app相关信息
  • dispatcher相关信息
  • server相关信息
  • systemui相关信息
  • vm相关信息

Event log抓取

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adb logcat -b events > event.log

如果想要获取更详细的信息可以加对应参数

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// 查看前台Activity
adb logcat -b events -s am_on_resume_called

Event log在源码中的信息详情

am

位置：/frameworks/base/services/core/java/com/android/server/am/EventLogTags.logtags

内容：

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# 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 !!
#
# Application Not Responding
30008 am_anr (User|1|5),(pid|1|5),(Package Name|3),(Flags|1|5),(reason|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),(OomAdj|1|5),(ProcState|1|5)

# 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)

# 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)

# 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),(Rss|2|2),(StatType|1|5),(ProcState|1|5),(TimeToCollect|2|2)

# Report changing memory conditions (Values are ProcessStats.ADJ_MEM_FACTOR* constants)
30050 am_mem_factor (Current|1|5),(Previous|1|5)

# UserState has changed
30051 am_user_state_changed (id|1|5),(state|1|5)

# Note when any processes of a uid have started running
30052 am_uid_running (UID|1|5)
# Note when all processes of a uid have stopped.
30053 am_uid_stopped (UID|1|5)
# Note when the state of a uid has become active.
30054 am_uid_active (UID|1|5)
# Note when the state of a uid has become idle (background check enforced).
30055 am_uid_idle (UID|1|5)
# Note when a service is being forcibly stopped because its app went idle.
30056 am_stop_idle_service (UID|1|5),(Component Name|3)

# The task is being compacted
30063 am_compact (Pid|1|5),(Process Name|3),(Action|3),(BeforeRssTotal|2|2),(BeforeRssFile|2|2),(BeforeRssAnon|2|2),(BeforeRssSwap|2|2),(DeltaRssTotal|2|2),(DeltaRssFile|2|2),(DeltaRssAnon|2|2),(DeltaRssSwap|2|2),(Time|2|3),(LastAction|1|2),(LastActionTimestamp|2|3),(setAdj|1|2),(procState|1|2),(BeforeZRAMFree|2|2),(DeltaZRAMFree|2|2)

# The task is being frozen
30068 am_freeze (Pid|1|5),(Process Name|3)

# The task is being unfrozen
30069 am_unfreeze (Pid|1|5),(Process Name|3)

# User switch events
30070 uc_finish_user_unlocking (userId|1|5)
30071 uc_finish_user_unlocked (userId|1|5)
30072 uc_finish_user_unlocked_completed (userId|1|5)
30073 uc_finish_user_stopping (userId|1|5)
30074 uc_finish_user_stopped (userId|1|5)
30075 uc_switch_user (userId|1|5)
30076 uc_start_user_internal (userId|1|5)
30077 uc_unlock_user (userId|1|5)
30078 uc_finish_user_boot (userId|1|5)
30079 uc_dispatch_user_switch (oldUserId|1|5),(newUserId|1|5)
30080 uc_continue_user_switch (oldUserId|1|5),(newUserId|1|5)
30081 uc_send_user_broadcast (userId|1|5),(IntentAction|3)
# Tags below are used by SystemServiceManager - although it's technically part of am, these are
# also user switch events and useful to be analyzed together with events above.
30082 ssm_user_starting (userId|1|5)
30083 ssm_user_switching (oldUserId|1|5),(newUserId|1|5)
30084 ssm_user_unlocking (userId|1|5)
30085 ssm_user_unlocked (userId|1|5)
30086 ssm_user_stopping (userId|1|5)
30087 ssm_user_stopped (userId|1|5)
30088 ssm_user_completed_event (userId|1|5),(eventFlag|1|5)

# Foreground service start/stop events.
30100 am_foreground_service_start (User|1|5),(Component Name|3),(allowWhileInUse|1),(startReasonCode|3),(targetSdk|1|1),(callerTargetSdk|1|1),(notificationWasDeferred|1),(notificationShown|1),(durationMs|1|3),(startForegroundCount|1|1),(stopReason|3)
30101 am_foreground_service_denied (User|1|5),(Component Name|3),(allowWhileInUse|1),(startReasonCode|3),(targetSdk|1|1),(callerTargetSdk|1|1),(notificationWasDeferred|1),(notificationShown|1),(durationMs|1|3),(startForegroundCount|1|1),(stopReason|3)
30102 am_foreground_service_stop (User|1|5),(Component Name|3),(allowWhileInUse|1),(startReasonCode|3),(targetSdk|1|1),(callerTargetSdk|1|1),(notificationWasDeferred|1),(notificationShown|1),(durationMs|1|3),(startForegroundCount|1|1),(stopReason|3)

这是系统预设的log，我们可以根据这些log去分析系统的流程或者问题，

例如：

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30008 am_anr (User|1|5),(pid|1|5),(Package Name|3),(Flags|1|5),(reason|3)

这个是发生ANR的类型，后面包含详细信息，User，pid，包名，原因等。

了解这些就可以知道每个对应log包含的内容以及含义。

常用的还有：

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# Reporting to applications that memory is low
30017 am_low_memory (Num Processes|1|1)

# Kill a process to reclaim memory.
30023 am_kill (User|1|5),(PID|1|5),(Process Name|3),(OomAdj|1|5),(Reason|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)

每个log上面都有对应的解释，后面都包含了详细信息，通过这些信息我们可以确定发生的进程，原因等，了解这些可以让我们比较容易的查找原因，分析流程。

app

位置：/frameworks/base/core/java/android/app/EventLogTags.logtags

内容：

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# See system/core/logcat/event.logtags for a description of the format of this file.

option java_package android.app

# Do not change these names without updating the checkin_events setting in
# google3/googledata/wireless/android/provisioning/gservices.config !!
#
# The activity's onPause has been called.
30021 c (Token|1|5),(Component Name|3),(Reason|3)
# The activity's onResume has been called.
30022 wm_on_resume_called (Token|1|5),(Component Name|3),(Reason|3)

# The activity's onStop has been called.
30049 wm_on_stop_called (Token|1|5),(Component Name|3),(Reason|3)

# The activity's onCreate has been called.
30057 wm_on_create_called (Token|1|5),(Component Name|3),(Reason|3)
# The activity's onRestart has been called.
30058 wm_on_restart_called (Token|1|5),(Component Name|3),(Reason|3)
# The activity's onStart has been called.
30059 wm_on_start_called (Token|1|5),(Component Name|3),(Reason|3)
# The activity's onDestroy has been called.
30060 wm_on_destroy_called (Token|1|5),(Component Name|3),(Reason|3)
# The activity's onActivityResult has been called.
30062 wm_on_activity_result_called (Token|1|5),(Component Name|3),(Reason|3)

# The activity's onTopResumedActivityChanged(true) has been called.
30064 wm_on_top_resumed_gained_called (Token|1|5),(Component Name|3),(Reason|3)
# The activity's onTopResumedActivityChanged(false) has been called.
30065 wm_on_top_resumed_lost_called (Token|1|5),(Component Name|3),(Reason|3)

这个log主要是应用端窗口启动或者状态改变的信息。

dispatcher

位置：/frameworks/native/services/inputflinger/dispatcher/EventLogTags.logtags

内容：

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# The entries in this file map a sparse set of log tag numbers to tag names.
# This is installed on the device, in /system/etc, and parsed by logcat.
#
# Tag numbers are decimal integers, from 0 to 2^31.  (Let's leave the
# negative values alone for now.)
#
# Tag names are one or more ASCII letters and numbers or underscores, i.e.
# "[A-Z][a-z][0-9]_".  Do not include spaces or punctuation (the former
# impacts log readability, the latter makes regex searches more annoying).
#
# Tag numbers and names are separated by whitespace.  Blank lines and lines
# starting with '#' are ignored.
#
# Optionally, after the tag names can be put a description for the value(s)
# of the tag. Description are in the format
#    (<name>|data type[|data unit])
# Multiple values are separated by commas.
#
# The data type is a number from the following values:
# 1: int
# 2: long
# 3: string
# 4: list
#
# The data unit is a number taken from the following list:
# 1: Number of objects
# 2: Number of bytes
# 3: Number of milliseconds
# 4: Number of allocations
# 5: Id
# 6: Percent
# Default value for data of type int/long is 2 (bytes).
#
# See system/core/logcat/event.logtags for the master copy of the tags.

# 62000 - 62199 reserved for inputflinger

62000 input_interaction (windows|4)
62001 input_focus (window|3),(reason|3)
62003 input_cancel (window|3),(reason|3)

# NOTE - the range 1000000-2000000 is reserved for partners and others who
# want to define their own log tags without conflicting with the core platform.

这个是我们查看input焦点窗口信息的，通过该log帮助我们查看操作过程中焦点的切换流程，帮助我们分析窗口焦点丢失的ANR原因。

server

位置：/frameworks/base/services/core/java/com/android/server/EventLogTags.logtags

内容：

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# See system/logging/logcat/event.logtags for a description of the format of this file.

option java_package com.android.server

# ---------------------------
# BatteryService.java
# ---------------------------
2722 battery_level (level|1|6),(voltage|1|1),(temperature|1|1)
2723 battery_status (status|1|5),(health|1|5),(present|1|5),(plugged|1|5),(technology|3)
# This is logged when battery goes from discharging to charging.
# It lets us count the total amount of time between charges and the discharge level
2730 battery_discharge (duration|2|3),(minLevel|1|6),(maxLevel|1|6)


# ---------------------------
# PowerManagerService.java
# ---------------------------
# This is logged when the device is being forced to sleep (typically by
# the user pressing the power button).
2724 power_sleep_requested (wakeLocksCleared|1|1)
# This is logged when the screen on broadcast has completed
2725 power_screen_broadcast_send (wakelockCount|1|1)
# This is logged when the screen broadcast has completed
2726 power_screen_broadcast_done (on|1|5),(broadcastDuration|2|3),(wakelockCount|1|1)
# This is logged when the screen on broadcast has completed
2727 power_screen_broadcast_stop (which|1|5),(wakelockCount|1|1)
# This is logged when the screen is turned on or off.
2728 power_screen_state (offOrOn|1|5),(becauseOfUser|1|5),(totalTouchDownTime|2|3),(touchCycles|1|1),(latency|1|3)
# This is logged when the partial wake lock (keeping the device awake
# regardless of whether the screen is off) is acquired or released.
2729 power_partial_wake_state (releasedorAcquired|1|5),(tag|3)
# The device is being asked to go into a soft sleep (typically by the ungaze gesture).
# It logs the time remaining before the device would've normally gone to sleep without the request.
2731 power_soft_sleep_requested (savedwaketimems|2)
# Power save state has changed. See BatterySaverController.java for the details.
2739 battery_saver_mode (fullPrevOffOrOn|1|5),(adaptivePrevOffOrOn|1|5),(fullNowOffOrOn|1|5),(adaptiveNowOffOrOn|1|5),(interactive|1|5),(features|3|5),(reason|1|5)
27390 battery_saving_stats (batterySaver|1|5),(interactive|1|5),(doze|1|5),(delta_duration|2|3),(delta_battery_drain|1|1),(delta_battery_drain_percent|1|6),(total_duration|2|3),(total_battery_drain|1|1),(total_battery_drain_percent|1|6)
# Note when the user activity timeout has been overriden by ActivityManagerService
27391 user_activity_timeout_override (override|2|3)
27392 battery_saver_setting (threshold|1)


# ---------------------------
# ThermalManagerService.java
# ---------------------------
2737 thermal_changed (name|3),(type|1|5),(temperature|5),(sensor_status|1|5),(previous_system_status|1|5)

#
# Leave IDs through 2740 for more power logs (2730 used by battery_discharge above)
#


# ---------------------------
# DeviceStorageMonitorService.java
# ---------------------------
# File on cache partition was deleted
2748 cache_file_deleted (path|3)
# Storage volume state and usable space in bytes
2749 storage_state (uuid|3),(old_state|1),(new_state|1),(usable|2),(total|2)


# ---------------------------
# NotificationManagerService.java
# ---------------------------
# when a NotificationManager.notify is called. status: 0=post, 1=update, 2=ignored
2750 notification_enqueue (uid|1|5),(pid|1|5),(pkg|3),(id|1|5),(tag|3),(userid|1|5),(notification|3),(status|1)
# when someone tries to cancel a notification, the notification manager sometimes
# calls this with flags too
2751 notification_cancel (uid|1|5),(pid|1|5),(pkg|3),(id|1|5),(tag|3),(userid|1|5),(required_flags|1),(forbidden_flags|1),(reason|1|5),(listener|3)
# when someone tries to cancel all of the notifications for a particular package
2752 notification_cancel_all (uid|1|5),(pid|1|5),(pkg|3),(userid|1|5),(required_flags|1),(forbidden_flags|1),(reason|1|5),(listener|3)
# when the notification panel is shown
# Note: New tag range starts here since 2753+ have been used below.
27500 notification_panel_revealed (items|1)
# when the notification panel is hidden
27501 notification_panel_hidden
# when notifications are newly displayed on screen, or disappear from screen
27510 notification_visibility_changed (newlyVisibleKeys|3),(noLongerVisibleKeys|3)
# when notifications are expanded, or contracted
27511 notification_expansion (key|3),(user_action|1),(expanded|1),(lifespan|1),(freshness|1),(exposure|1)
# when a notification has been clicked
27520 notification_clicked (key|3),(lifespan|1),(freshness|1),(exposure|1),(rank|1),(count|1)
# when a notification action button has been clicked
27521 notification_action_clicked (key|3),(action_index|1),(lifespan|1),(freshness|1),(exposure|1),(rank|1),(count|1)
# when a notification has been canceled
27530 notification_canceled (key|3),(reason|1),(lifespan|1),(freshness|1),(exposure|1),(rank|1),(count|1),(listener|3)
# replaces 27510 with a row per notification
27531 notification_visibility (key|3),(visibile|1),(lifespan|1),(freshness|1),(exposure|1),(rank|1)
# a notification emited noise, vibration, or light
27532 notification_alert (key|3),(buzz|1),(beep|1),(blink|1)
# a notification was added to a autogroup
27533 notification_autogrouped (key|3)
# notification was removed from an autogroup
275534 notification_unautogrouped (key|3)
# when a notification is adjusted via assistant
27535 notification_adjusted (key|3),(adjustment_type|3),(new_value|3)

# ---------------------------
# Watchdog.java
# ---------------------------
2802 watchdog (Service|3)
2803 watchdog_proc_pss (Process|3),(Pid|1|5),(Pss|1|2)
2804 watchdog_soft_reset (Process|3),(Pid|1|5),(MaxPss|1|2),(Pss|1|2),(Skip|3)
2805 watchdog_hard_reset (Process|3),(Pid|1|5),(MaxPss|1|2),(Pss|1|2)
2806 watchdog_pss_stats (EmptyPss|1|2),(EmptyCount|1|1),(BackgroundPss|1|2),(BackgroundCount|1|1),(ServicePss|1|2),(ServiceCount|1|1),(VisiblePss|1|2),(VisibleCount|1|1),(ForegroundPss|1|2),(ForegroundCount|1|1),(NoPssCount|1|1)
2807 watchdog_proc_stats (DeathsInOne|1|1),(DeathsInTwo|1|1),(DeathsInThree|1|1),(DeathsInFour|1|1),(DeathsInFive|1|1)
2808 watchdog_scheduled_reboot (Now|2|1),(Interval|1|3),(StartTime|1|3),(Window|1|3),(Skip|3)
2809 watchdog_meminfo (MemFree|1|2),(Buffers|1|2),(Cached|1|2),(Active|1|2),(Inactive|1|2),(AnonPages|1|2),(Mapped|1|2),(Slab|1|2),(SReclaimable|1|2),(SUnreclaim|1|2),(PageTables|1|2)
2810 watchdog_vmstat (runtime|2|3),(pgfree|1|1),(pgactivate|1|1),(pgdeactivate|1|1),(pgfault|1|1),(pgmajfault|1|1)
2811 watchdog_requested_reboot (NoWait|1|1),(ScheduleInterval|1|3),(RecheckInterval|1|3),(StartTime|1|3),(Window|1|3),(MinScreenOff|1|3),(MinNextAlarm|1|3)

# ---------------------------
# RescueParty.java
# ---------------------------
2900 rescue_note (uid|1),(count|1),(window|2)
2901 rescue_level (level|1),(trigger_uid|1)
2902 rescue_success (level|1)
2903 rescue_failure (level|1),(msg|3)

# ---------------------------
# BackupManagerService.java
# ---------------------------
2820 backup_data_changed (Package|3)
2821 backup_start (Transport|3)
2822 backup_transport_failure (Package|3)
2823 backup_agent_failure (Package|3),(Message|3)
2824 backup_package (Package|3),(Size|1|2)
2825 backup_success (Packages|1|1),(Time|1|3)
2826 backup_reset (Transport|3)
2827 backup_initialize
2828 backup_requested (Total|1|1),(Key-Value|1|1),(Full|1|1)
2829 backup_quota_exceeded (Package|3)
2830 restore_start (Transport|3),(Source|2|5)
2831 restore_transport_failure
2832 restore_agent_failure (Package|3),(Message|3)
2833 restore_package (Package|3),(Size|1|2)
2834 restore_success (Packages|1|1),(Time|1|3)

2840 full_backup_package (Package|3)
2841 full_backup_agent_failure (Package|3),(Message|3)
2842 full_backup_transport_failure
2843 full_backup_success (Package|3)
2844 full_restore_package (Package|3)
2845 full_backup_quota_exceeded (Package|3)
2846 full_backup_cancelled (Package|3),(Message|3)

2850 backup_transport_lifecycle (Transport|3),(Bound|1|1)
2851 backup_transport_connection (Transport|3),(Connected|1|1)


# ---------------------------
# SystemServer.java
# ---------------------------
# SystemServer.run() starts:
3010 boot_progress_system_run (time|2|3)
3011 system_server_start (start_count|1),(uptime|2|3),(elapse_time|2|3)

# ---------------------------
# PackageManagerService.java
# ---------------------------
# Package Manager starts:
3060 boot_progress_pms_start (time|2|3)
# Package Manager .apk scan starts:
3070 boot_progress_pms_system_scan_start (time|2|3)
# Package Manager .apk scan starts:
3080 boot_progress_pms_data_scan_start (time|2|3)
# Package Manager .apk scan ends:
3090 boot_progress_pms_scan_end (time|2|3)
# Package Manager ready:
3100 boot_progress_pms_ready (time|2|3)
# + check activity_launch_time for Home app
# Value of "unknown sources" setting at app install time
3110 unknown_sources_enabled (value|1)
# Package Manager critical info
3120 pm_critical_info (msg|3)
# Disk usage stats for verifying quota correctness
3121 pm_package_stats (manual_time|2|3),(quota_time|2|3),(manual_data|2|2),(quota_data|2|2),(manual_cache|2|2),(quota_cache|2|2)
# Snapshot statistics
3130 pm_snapshot_stats (build_count|1|1),(reuse_count|1|1),(big_builds|1|1),(short_lived|1|1),(max_build_time|1|3),(cumm_build_time|2|3)
# Snapshot rebuild instance
3131 pm_snapshot_rebuild (build_time|1|3),(lifetime|1|3)

# ---------------------------
# InputMethodManagerService.java
# ---------------------------
# Re-connecting to input method service because we haven't received its interface
32000 imf_force_reconnect_ime (IME|4),(Time Since Connect|2|3),(Showing|1|1)


# ---------------------------
# WallpaperManagerService.java
# ---------------------------
33000 wp_wallpaper_crashed (component|3)

# ---------------------------
# Device idle
# ---------------------------
34000 device_idle (state|1|5), (reason|3)
34001 device_idle_step
34002 device_idle_wake_from_idle (is_idle|1|5), (reason|3)
34003 device_idle_on_start
34004 device_idle_on_phase (what|3)
34005 device_idle_on_complete
34006 device_idle_off_start (reason|3)
34007 device_idle_off_phase (what|3)
34008 device_idle_off_complete
34009 device_idle_light (state|1|5), (reason|3)
34010 device_idle_light_step

# ---------------------------
# DisplayManagerService.java
# ---------------------------
# Auto-brightness adjustments by the user.
35000 auto_brightness_adj (old_lux|5),(old_brightness|5),(new_lux|5),(new_brightness|5)

# ---------------------------
# ConnectivityService.java
# ---------------------------
# Connectivity state changed
50020 connectivity_state_changed (type|1),(subtype|1),(state|1)


# ---------------------------
# NetworkStatsService.java
# ---------------------------
51100 netstats_mobile_sample (dev_rx_bytes|2|2),(dev_tx_bytes|2|2),(dev_rx_pkts|2|1),(dev_tx_pkts|2|1),(xt_rx_bytes|2|2),(xt_tx_bytes|2|2),(xt_rx_pkts|2|1),(xt_tx_pkts|2|1),(uid_rx_bytes|2|2),(uid_tx_bytes|2|2),(uid_rx_pkts|2|1),(uid_tx_pkts|2|1),(trusted_time|2|3)
51101 netstats_wifi_sample (dev_rx_bytes|2|2),(dev_tx_bytes|2|2),(dev_rx_pkts|2|1),(dev_tx_pkts|2|1),(xt_rx_bytes|2|2),(xt_tx_bytes|2|2),(xt_rx_pkts|2|1),(xt_tx_pkts|2|1),(uid_rx_bytes|2|2),(uid_tx_bytes|2|2),(uid_rx_pkts|2|1),(uid_tx_pkts|2|1),(trusted_time|2|3)


# ---------------------------
# LockdownVpnTracker.java
# ---------------------------
51200 lockdown_vpn_connecting (egress_net|1)
51201 lockdown_vpn_connected (egress_net|1)
51202 lockdown_vpn_error (egress_net|1)

# ---------------------------
# ConfigUpdateInstallReceiver.java
# ---------------------------
51300 config_install_failed (dir|3)

# ---------------------------
# IntentFirewall.java
# ---------------------------
51400 ifw_intent_matched (Intent Type|1|5),(Component Name|3),(Caller Uid|1|5),(Caller Pkg Count|1|1),(Caller Pkgs|3),(Action|3),(MIME Type|3),(URI|3),(Flags|1|5)

# ---------------------------
# IdleMaintenanceService.java
# ---------------------------
51500 idle_maintenance_window_start (time|2|3), (lastUserActivity|2|3), (batteryLevel|1|6), (batteryCharging|1|5)
51501 idle_maintenance_window_finish (time|2|3), (lastUserActivity|2|3), (batteryLevel|1|6), (batteryCharging|1|5)

# ---------------------------
# StorageManagerService.java
# ---------------------------
2755 fstrim_start (time|2|3)
2756 fstrim_finish (time|2|3)

# ---------------------------
# Job scheduler
# ---------------------------
8000 job_deferred_execution (time|2|3)

# AudioService.java
# ---------------------------
40000 volume_changed (stream|1), (prev_level|1), (level|1), (max_level|1), (caller|3)
40001 stream_devices_changed (stream|1), (prev_devices|1), (devices|1)

# ---------------------------
# GestureLauncherService.java
# ---------------------------
40100 camera_gesture_triggered (gesture_on_time|2|3), (sensor1_on_time|2|3), (sensor2_on_time|2|3), (event_extra|1|1)

# ---------------------------
# timezone/RulesManagerService.java
# ---------------------------
51600 timezone_trigger_check (token|3)
51610 timezone_request_install (token|3)
51611 timezone_install_started (token|3)
51612 timezone_install_complete (token|3), (result|1)
51620 timezone_request_uninstall (token|3)
51621 timezone_uninstall_started (token|3)
51622 timezone_uninstall_complete (token|3), (result|1)
51630 timezone_request_nothing (token|3)
51631 timezone_nothing_complete (token|3)

这个是有关系统server的log信息，里面每行都有详细解释。包含了很多服务的状态。

systemui

位置：/frameworks/base/packages/SystemUI/src/com/android/systemui/EventLogTags.logtags

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# See system/core/logcat/event.logtags for a description of the format of this file.

option java_package com.android.systemui;

# ---------------------------
# PhoneStatusBar.java
# ---------------------------
36000 sysui_statusbar_touch (type|1),(x|1),(y|1),(disable1|1),(disable2|1)
36001 sysui_heads_up_status (key|3),(visible|1)
36002 sysui_fullscreen_notification (key|3)
36003 sysui_heads_up_escalation (key|3)
# sysui_status_bar_state: Logged whenever the status bar / keyguard state changes
## state: 0: SHADE, 1: KEYGUARD, 2: SHADE_LOCKED
## keyguardShowing: 1: Keyguard shown to the user (or keyguardOccluded)
## keyguardOccluded: 1: Keyguard active, but another activity is occluding it
## bouncerShowing: 1: Bouncer currently shown to the user
## secure: 1: The user has set up a secure unlock method (PIN, password, etc.)
## currentlyInsecure: 1: No secure unlock method set up (!secure), or trusted environment (TrustManager)
36004 sysui_status_bar_state (state|1),(keyguardShowing|1),(keyguardOccluded|1),(bouncerShowing|1),(secure|1),(currentlyInsecure|1)

# ---------------------------
# PhoneStatusBarView.java
# ---------------------------
36010 sysui_panelbar_touch (type|1),(x|1),(y|1),(enabled|1)

# ---------------------------
# NotificationPanelView.java
# ---------------------------
36020 sysui_notificationpanel_touch (type|1),(x|1),(y|1)
## type: 1: SWIPE_UP_UNLOCK           Swiped up to dismiss the lockscreen.
##       2: SWIPE_DOWN_FULL_SHADE     Swiped down to enter full shade.
##       3: TAP_UNLOCK_HINT           Tapped in empty area, causes unlock hint.
##       4: SWIPE_CAMERA              Swiped the camera icon, launches.
##       5: SWIPE_DIALER              Swiped the dialer icon, launches.
##       6: TAP_LOCK                  Tapped the (unlocked) lock icon, locks the device.
##       7: TAP_NOTIFICATION_ACTIVATE Tapped a lockscreen notification, causes "tap again" hint.
##                                    Note: Second tap logged as notification_clicked.
36021 sysui_lockscreen_gesture (type|1),(lengthDp|1),(velocityDp|1)

# ---------------------------
# SettingsPanelView.java
# ---------------------------
36030 sysui_quickpanel_touch (type|1),(x|1),(y|1)

# ---------------------------
# PanelHolder.java
# ---------------------------
36040 sysui_panelholder_touch (type|1),(x|1),(y|1)

# ---------------------------
# SearchPanelView.java
# ---------------------------
36050 sysui_searchpanel_touch (type|1),(x|1),(y|1)

# ---------------------------
# Recents.java, RecentsSystemUser.java
# ---------------------------
## type: 1: USER_BIND_SERVICE        Secondary user tries binding to the system sysui service
##       2: USER_SYSTEM_BOUND        Secondary user is bound to the system sysui service
##       3: USER_SYSTEM_UNBOUND      Secondary user loses connection after system sysui has died
##       4: SYSTEM_REGISTER_USER     System sysui registers user's callbacks
##       5: SYSTEM_UNREGISTER_USER   System sysui unregisters user's callbacks (after death)
36060 sysui_recents_connection (type|1),(user|1)

vm

位置：/frameworks/base/services/core/java/com/android/server/wm/EventLogTags.logtags

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# See system/core/logcat/event.logtags for a description of the format of this file.

option java_package com.android.server.wm

# 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 wm_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 wm_task_to_front (User|1|5),(Task|1|5)
# An existing activity is being given a new intent:
30003 wm_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 wm_create_task (User|1|5),(Task ID|1|5)
# A new activity is being created in an existing task:
30005 wm_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 wm_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 wm_resume_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3)

# Activity launch time
30009 wm_activity_launch_time (User|1|5),(Token|1|5),(Component Name|3),(time|2|3)

# The Activity Manager failed to pause the given activity.
30012 wm_failed_to_pause (User|1|5),(Token|1|5),(Wanting to pause|3),(Currently pausing|3)
# Attempting to pause the current activity
30013 wm_pause_activity (User|1|5),(Token|1|5),(Component Name|3),(User Leaving|3),(Reason|3)
# Application process has been started

# An activity is being destroyed:
30018 wm_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 wm_relaunch_resume_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3)
# An activity has been relaunched:
30020 wm_relaunch_activity (User|1|5),(Token|1|5),(Task ID|1|5),(Component Name|3)

# Activity set to resumed
30043 wm_set_resumed_activity (User|1|5),(Component Name|3),(Reason|3)

# Root task focus
30044 wm_focused_root_task (User|1|5),(Display Id|1|5),(Focused Root Task Id|1|5),(Last Focused Root Task Id|1|5),(Reason|3)

# Attempting to stop an activity
30048 wm_stop_activity (User|1|5),(Token|1|5),(Component Name|3)

# The task is being removed from its parent task
30061 wm_remove_task (Task ID|1|5), (Root Task ID|1|5)

# An activity been add into stopping list
30066 wm_add_to_stopping (User|1|5),(Token|1|5),(Component Name|3),(Reason|3)

# Keyguard status changed
30067 wm_set_keyguard_shown (Display Id|1|5),(keyguardShowing|1),(aodShowing|1),(keyguardGoingAway|1),(Reason|3)

# Out of memory for surfaces.
31000 wm_no_surface_memory (Window|3),(PID|1|5),(Operation|3)
# Task created.
31001 wm_task_created (TaskId|1|5),(RootTaskId|1|5)
# Task moved to top (1) or bottom (0).
31002 wm_task_moved (TaskId|1|5),(ToTop|1),(Index|1)
# Task removed with source explanation.
31003 wm_task_removed (TaskId|1|5),(Reason|3)
# bootanim finished:
31007 wm_boot_animation_done (time|2|3)

# Request surface flinger to show / hide the wallpaper surface.
33001 wm_wallpaper_surface (Display Id|1|5),(Visible|1),(Target|3)

这个是server端窗口状态的log信息。

由于ANR涉及应用端，系统端，涉及UI，流程，代码逻辑，窗口切换，Input事件分发，系统绘制等各个方面，因此要分析ANR就需要了解应用端流程，以及系统流程，因此学习上面这些log对应的内容也是非常重要的，熟练了解这些内容后，对于我们分析ANR或者其他问题都是非常有帮助的。

当然，要记住这么多log还是有难度的，主要是理解，看到能知道什么含义，如果不熟悉，那知道怎么查找也是有帮助的。

本章我个人解释的东西比较少，主要是里面都有注释和含义，基本都能看懂，更详细的需要去看源码，查看源码中代码流程。