在分析app在测量功耗和亮灭屏的过程中，经常执行dumpsys power来获取PowerManagerService状态。以下是关于dumpsys power请在评论区指出打印部分字段的含义。
POWER MANAGER (dumpsys power)
Power Manager State: Settings power_manager_constants: no_cached_wake_locks=true mDirty=0x0 （mDirty PMS核心参数用于表示当前事件类型的变化) mWakefulness=Awake 当前预期的屏幕状态，Awake 表示唤醒状态 mWakefulnessChanging=falsemWakefulnessChanging 表示上一个参数mWakefulness如果这个参数发生变化，是否会改变true，然后会调用DIsplayManager切换屏幕状态 mIsPowered=true 是否充电，true在充电中表示 mPlugType=2 充电类型 mBatteryLevel=82 当前电量 mBatteryLevelWhenDreamStarted=0 mDockState=0 mStayOn=false 屏幕是否需要长亮 mProximityPositive=false 通话时距离感应传感器(打电话时，手机贴在脸上就会熄屏) mBootCompleted=true 是否开始 mSystemReady=true 系统准备好了吗？ mHalAutoSuspendModeEnabled=false HAL层是否自己进入Suspend模式 mHalInteractiveModeEnabled=true 向HAL当前用户活动状态的层设置，true表示屏幕打开，用户在使用，false表示用户没有使用 mWakeLockSummary=0x25 记录所有锁的类型 mNotifyLongScheduled= 27s645ms mNotifyLongDispatched=-51s118ms mNotifyLongNextCheck=(none) mUserActivitySummary=0x1 用户活动事件标志 mRequestWaitForNegativeProximity=false mSandmanScheduled=false mSandmanSummoned=false mBatteryLevelLow=false 电池是否低电 mLightDeviceIdleMode=false mDeviceIdleMode=false mDeviceIdleWhitelist=[1000, 2000, 10014] 设备在IDLE状态下的app白名单 mDeviceIdleTempWhitelist=[1000] mLastWakeTime=577519 (32358 ms ago) 重要的是，这意味着上次屏幕点亮的事件32358 ms ago 表示距离当前时间，屏幕在32秒前点亮 mLastSleepTime=498525 (111352 ms ago) 11352上次屏幕灭屏时间 ms ago 111秒前的息屏表示 mLastUserActivityTime=577519 (32358 ms ago) 最后一次活动时间，点击、充电等 mLastUserActivityTimeNoChangeLights=64807 (545070 ms ago) 用户最后一次不影响屏幕亮度的事件 mLastInteractivePowerHintTime=577519 (32358 ms ago) mLastScreenBrightnessBoostTime=0 (609877 ms ago) 最后一次自动调整屏幕亮度的时间(即手机从黑暗的地方进入明亮的地方，手机屏幕会自动调整到最大亮度) mScreenBrightnessBoostInProgress=false 是否正在调整屏幕亮度 mDisplayReady=true 显示器准备好了吗？OK mHoldingWakeLockSuspendBlocker=true 是否持有阻止CPU休眠的锁 mHoldingDisplaySuspendBlocker=true 是否显示屏息屏的锁是否持有？
Settings and Configuration: 以下部分是系统的原始配置参数 mDecoupleHalAutoSuspendModeFromDisplayConfig=false mDecoupleHalInteractiveModeFromDisplayConfig=false mWakeUpWhenPluggedOrUnpluggedConfig=true mWakeUpWhenPluggedOrUnpluggedInTheaterModeConfig=false mTheaterModeEnabled=false mSuspendWhenScreenOffDueToProximityConfig=true mDreamsSupportedConfig=true mDreamsEnabledByDefaultConfig=true mDreamsActivatedOnSleepByDefaultConfig=false mDreamsActivatedOnDockByDefaultConfig=true mDreamsEnabledOnBatteryConfig=false mDreamsBatteryLevelMinimumWhenPoweredConfig=-1 mDreamsBatteryLevelMinimumWhenNotPoweredConfig=15 mDreamsBatteryLevelDrainCutoffConfig=5 mDreamsEnabledSetting=true mDreamsActivateOnSleepSetting=false mDreamsActivateOnDockSetting=true mDozeAfterScreenOff=false mMinimumScreenOffTimeoutConfig=10000 mMaximumScreenDimDurationConfig=7000 mMaximumScreenDimRatioConfig=0.20000005 mScreenOffTimeoutSetting=60000 mSleepTimeoutSetting=-1 mMaximumScreenOffTimeoutFromDeviceAdmin=9223372036854775807 (enforced=false) mStayOnWhilePluggedInSetting=0 mScreenBrightnessSetting=0 mScreenBrightnessModeSetting=0 mScreenBrightnessOverrideFromWindowManager=-1 mUserActivityTimeoutOverrideFromWindowManager=-1 mUserInactiveOverrideFromWindowManager=false mDozeScreenStateOverrideFromDreamManager=0 mDrawWakeLockOverrideFromSidekick=false mDozeScreenBrightnessOverrideFromDreamManager=-1 mScreenBrightnessSettingMinimum=10 mScreenBrightnessSettingMaximum=255 mScreenBrightnessSettingDefault=102 mDoubleTapWakeEnabled=false mIsVrModeEnabled=false mForegroundProfile=0
Sleep timeout: -1 ms Screen off timeout: 60000 ms 实现用户设置的手机灭屏(从最后一个用户事件到屏幕完全熄灭，这是60秒) Screen dim duration: 7000 ms 屏幕熄灭前变暗所持续的事件
应用状态信息
UID states (changing=false changed=false):
1000 表示应用的UDI，ACTIVE 表示应用是否处于活动状态，count该应用程序申请的锁的数量state 表示应用程序的运行等级
应用的运行等级可以百度搜索PROCESS_STATE_NONEXISTENT 让我们种状态下的具体运行状态。 UID 1000: ACTIVE count=0 state=0 UID 1001: ACTIVE count=0 state=0 UID 1027: ACTIVE count=0 state=0 UID 1068: ACTIVE count=0 state=0 UID u0a8: INACTIVE count=0 state=18 UID u0a13: INACTIVE count=0 state=18 UID u0a14: INACTIVE count=0 state=9 UID u0a19: INACTIVE count=0 state=18 UID u0a21: ACTIVE count=0 state=18 UID u0a24: ACTIVE count=0 state=0 UID u0a25: ACTIVE count=0 state=4 UID u0a34: INACTIVE count=0 state=18 UID u0a38: INACTIVE count=0 state=18 UID u0a40: INACTIVE count=0 state=18 UID u0a43: INACTIVE count=0 state=18 UID u0a44: ACTIVE count=0 state=5 UID u0a53: ACTIVE count=0 state=13 UID u0a54: ACTIVE count=2 state=2
Looper state:
待处理的handl消息 Looper (PowerManagerService, tid 34) {6ca4820} Message 0: { when=+20s642ms what=1 target=com.android.server.power.PowerManagerService$PowerManagerHandler } Message 1: { when=+27s645ms what=4 target=com.android.server.power.PowerManagerService$PowerManagerHandler } (Total messages: 2, polling=true, quitting=false)
Wake Locks: size=2 应用申请的锁的数量
锁的类型 锁的tag 当前锁所持有的时间 申请锁的app的UID以及PID PARTIAL_WAKE_LOCK 'My_Tag_PARTIAL_WAKE_LOCK' ACQ=-24s518ms (uid=10054 pid=15301) SCREEN_DIM_WAKE_LOCK 'My_Tag_SCREEN_DIM_WAKE_LOCK' ACQ=-24s512ms (uid=10054 pid=15301)
Suspend Blockers: size=4 PowerManagerService.WakeLocks: ref count=1 PowerManagerService.Display: ref count=1 PowerManagerService.Broadcasts: ref count=0 PowerManagerService.WirelessChargerDetector: ref count=0
Display Power: state=ON
Battery saving stats: Battery Saver is currently: OFF Last OFF time: 2020-10-30 09:36:09.545 -6h5m54s767ms 距离上次充满电的时间 Times enabled: 0
Drain stats: Battery saver OFF ON NonDoze NonIntr: 358m 29mAh( 1%) 4.9mAh/h 0m 0mAh( 0%) 0.0mAh/h Intr: 1m 0mAh( 0%) 0.0mAh/h 0m 0mAh( 0%) 0.0mAh/h Deep NonIntr: 0m 0mAh( 0%) 0.0mAh/h 0m 0mAh( 0%) 0.0mAh/h Intr: 0m 0mAh( 0%) 0.0mAh/h 0m 0mAh( 0%) 0.0mAh/h Light NonIntr: 0m 0mAh( 0%) 0.0mAh/h 0m 0mAh( 0%) 0.0mAh/h Intr: 0m 0mAh( 0%) 0.0mAh/h 0m 0mAh( 0%) 0.0mAh/h
Battery saver policy (*NOTE* they only apply when battery saver is ON): Settings: battery_saver_constants value: null Settings: (overlay) value:
mAccessibilityEnabled=false vibration_disabled:config=true vibration_disabled:effective=true animation_disabled=false fullbackup_deferred=true keyvaluebackup_deferred=true firewall_disabled=false datasaver_disabled=true launch_boost_disabled=true adjust_brightness_disabled=true adjust_brightness_factor=0.5 gps_mode=2 force_all_apps_standby=true force_background_check=true optional_sensors_disabled=true aod_disabled=true send_tron_log=false
Interactive File values:
Noninteractive File values:
Battery saver state machine: Enabled=false mLastChangedIntReason=0 mLastChangedStrReason=null mBootCompleted=true mSettingsLoaded=true mBatteryStatusSet=true mBatterySaverSnoozing=false mIsPowered=true mBatteryLevel=82 mIsBatteryLevelLow=false mSettingBatterySaverEnabled=false mSettingBatterySaverEnabledSticky=false mSettingBatterySaverTriggerThreshold=0
Profile power states: size=0
Wireless Charger Detector State: mGravitySensor={Sensor name="Gravity Sensor", vendor="AOSP", version=3, type=9, maxRange=19.6133, resolution=0.0012, power=0.002, minDelay=10000} mPoweredWirelessly=false mAtRest=false mRestX=0.0, mRestY=0.0, mRestZ=0.0 mDetectionInProgress=false mDetectionStartTime=0 (never) mMustUpdateRestPosition=false mTotalSamples=0 mMovingSamples=0 mFirstSampleX=0.0, mFirstSampleY=0.0, mFirstSampleZ=0.0 mLastSampleX=0.0, mLastSampleY=0.0, mLastSampleZ=0.0