在测量功耗的时候，通常是使用Power Monitor去拆分，或者对单一模块进行测量。
今天突然在网上发现一个神奇的工具BatteryHistorian，跟Systrace很像，能很好的展示记录的过程中系统中各模块的耗电状态。

Android电池功耗BatteryHistorian数据分析

准备工作

操作步骤：
adb shell dumpsys batterystats --reset
adb shell dumpsys batterystats --enable full-wake-history

在问题场景复现
adb bugreport > bugreport.txt
adb shell dumpsys batterystats > batterystats.txt

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bugreport.txt

bugreport.txt中记录了从系统中拉出来zip文件名称

/data/user_de/0/com.android.shell/files/bugreports/bugreport-x.zip: 1 file pulled, 0 skipped. 67.9 MB/s (9751279 bytes in 0.137s)
Bug report copied to C:\Users\lenovo\bugreport-x.zip
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接下来就是要使用BatteryHistorian，这个网上有很多教程如何搭建，这边找到了一个公开的网站能更省事一点，如下
Upload Bugreport in BatteryHistorian

模块功能简介

CPU runing: cpu运行的状态 
Kernel only uptime: 只有kernell运行
Userspace wakelock: 用户空间申请的锁 
Screen: 屏幕是否点亮 
Top app: 当前在内存中的应用，按内存占用率排序 
Activity Manager Proc: 活跃的用户进程 
Crashes(logcat): 某个时间点出现crash的应用 
Doze: 是否进入doze模式 
Device active: 和Doze相反 
JobScheduler: 异步作业调度 
SyncManager: 同步操作 
Temp White List: 电量优化白名单 
Phone call: 是否打电话 
GPS: 是否使用GPS 
Network connectivity: 网络连接状态（wifi、mobile是否连接） 
Mobile signal strength: 移动信号强度（great\good\moderate\poor） 
Wifi scan: 是否在扫描wifi信号 
Wifi supplicant: 是否有wifi请求 
Wifi radio: 是否正在通过wifi传输数据 
Wifi signal strength: wifi信号强度 
Wifi running: wifi组件是否在工作(未传输数据) 
Wifi on: 同上 
Audio: 音频子系统? 
Camera: 相机是否在工作 
Video:是否在播放视频 
Foreground process: 前台进程 
Package install: 是否在进行包安装 
Package active: 包管理在工作 
Battery level: 电池当前电量 
Temperature: 电池温度 
Plugged: 连接usb或者充电 
Charging on: 在充电 
Logcat misc: 是否在导出日志
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batterystats.txt

batterystats.txt 中记录的东西会比BatteryHistorian更加详细，列举部分，里面信息还是很全的，充电时的状态，不充电时的状态等等

模块功能简介

uptime: 未待机运行时间,cpu工作时间
realtime: 系统运行时间包含休眠时间
doze模式：延缓推迟后台的动作，off light deep(full)
power-save-off：不在省点状态
device-idle-on:在空闲状态
cell standby:射频待机的耗电量

RESET:Time：执行adb shell dumpsys batterystats --reset的开始时间
Per-PID Stats: 每个进程唤醒工作的时间
Discharge step durations: 每掉一隔电的时间点和设备的状态
Daily stats: 以天为单位展示每掉一隔电的时间点和设备状态
Statistics since last charge: 从上次充电以来的统计详情，包含很多子板块
Battery History: 耗电统计的历史记录，每一条记录以HistoryItem的形式存在
Cellular Statistics：移动数据网络状态和使用情况
Wifi Statistics: WIFI的网络状态和使用情况
Bluetooth: 蓝牙在不同工作状态下的使用情况
Estimated power use (mAh): 近似计算出的各个用户(uid)的耗电量
All kernel wake locks: 内核锁的使用统计
All partial wake locks: 应用锁的使用统计
All wakeup reasons: 所有的唤醒原因
Statistics by uid: 每一个uid的耗电细节
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部分log内容

Battery History (7% used, 323KB used of 4096KB, 560 strings using 65KB):

Per-PID Stats:
  PID 1512 wake time: +3m28s201ms

Discharge step durations:
  #0: +1h29m59s999ms to 61 (screen-off, power-save-off, device-idle-on)


Daily stats:
  Current start time: 2022-06-15-03-43-28
  Next min deadline: 2022-06-16-01-00-00
  Next max deadline: 2022-06-16-03-00-00
  Current daily discharge step durations:
    
  Daily from 2022-06-14-03-52-30 to 2022-06-15-03-43-28:
    Discharge step durations:
      #0: +1h46m27s123ms to 69 (screen-off, power-save-off, device-idle-on)
      #1: +1h43m48s84ms to 70 (screen-off, power-save-off, device-idle-on)
        Discharge total time: 5d 23h 11m 29s 600ms  (from 14 steps)
        Discharge screen off time: 6d 10h 12m 8s 400ms  (from 12 steps)
        Discharge screen off device idle time: 7d 0h 24m 49s 300ms  (from 9 steps)
    Charge step durations:
      #0: +51m12s103ms to 77 (screen-on, power-save-off, device-idle-off)
      #1: +1m29s651ms to 78 (screen-off, power-save-off, device-idle-off)
        Charge total time: 2d 13h 46m 10s 200ms  (from 6 steps)
        Charge screen off time: 2h 29m 25s 100ms  (from 1 steps)
        Charge screen on time: 3d 13h 20m 10s 300ms  (from 1 steps)
    Package changes:
      Update com.android.chrome vers=500509833
      Update com.android.chrome vers=500509833
      Update com.google.android.gms vers=221820039
      Update com.google.android.gms vers=221820039
      
Statistics since last charge:
  System starts: 0, currently on battery: false
  Estimated battery capacity: 4000 mAh
  Min learned battery capacity: 3288 mAh
  Max learned battery capacity: 3288 mAh
  Time on battery: 23h 55m 11s 793ms (99.8%) realtime, 1h 8m 46s 578ms (4.8%) uptime
 Wifi Statistics:
     Wifi kernel active time: 4h 55m 40s 779ms (20.6%)
     WiFi Scan time:  20m 20s 606ms (1.4%)
     WiFi Sleep time:  23h 8m 54s 844ms (96.8%)
     WiFi Idle time:   44m 18s 427ms (3.1%)
     WiFi Rx time:     1m 25s 214ms (0.1%)
     WiFi Tx time:     33s 308ms (0.0%)
     Wifi data received: 43.52MB
     Wifi data sent: 3.34MB
     Wifi packets received: 52277
     Wifi packets sent: 28911
     Wifi states:
       sta 23h 55m 11s 793ms (100.0%)

All kernel wake locks:
Kernel Wake lock PowerManagerService.WakeLocks: 8m 6s 360ms (268 times) realtime

All partial wake locks:
Wake lock u0a225 *job*/com.android.vending/com.google.android.finsky.scheduler.process.backgroundimpl...
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电量估计

电量统计日志
BatteryHistorian中的平均电流计算来源于电池容量的估计值，在batterystats.txt中可以得知Estimated battery capacity: 4000 mAh

frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java 
mEstimatedBatteryCapacityMah = (int) mPowerProfile.getBatteryCapacity();

framework/base/core/java/com/android/internal/os/PowerProfile.java
readPowerValuesFromXml

framework/base/core/res/res/xml/power_profile.xml
<item name="battery.capacity">4000</item>
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最后想说的是GMS版本连接wifi后台google service一直有在运行，造成wifi功耗高，其实不是wifi本身的问题。