屏幕关闭原因以及p-sensor

按下电源按键后屏幕关闭的log如下：
D/WindowManager( 250): interceptKeyTq keycode=26 screenIsOn=true keyguardActive=false
I/power ( 250): *** set_screen_state 0
D/SurfaceFlinger( 87): About to give-up screen, flinger = 0x1671960
E/libEGL ( 87): validate_display:188 error 3008 (EGL_BAD_DISPLAY)
I/PowerManagerService( 250): setScreenState: screen_state=false mPartialCount=0err=0
D/Sensors ( 250): PlsSensor::enable en=0; newState=0; what=0; mEnabled=1
D/Sensors ( 250): PlsSensor::enable what=0; flags=0; err=0
D/Sensors ( 250): PlsSensor::mEnabled=0x0
V/PowerManagerService( 250): unregisterListener mLightListenerKB
D/KeyguardViewMediator( 250): onScreenTurnedOff(2)
D/KeyguardViewMediator( 250): onScreenTurnedOff : doKeyguardLocked is run !
D/KeyguardViewMediator( 250): doKeyguard: showing the lock screen
D/KeyguardViewMediator( 250): showLocked
I/PowerManagerService( 250): mLocks 01sleep_broadcast
D/PowerManagerService( 250): acquireWakeLock flags=0x1 tag=sleep_broadcast
D/PowerManagerService( 250): acquireWakeLock flags=0x1 tag=show keyguard
I/WindowManager( 250): PhoneWindowManager screenTurnedOff is run and why =2

打电话时p-sensor被遮挡后屏幕关闭的log如下：
D/Sensors ( 250): PlsSensor: mPendingEvents[Proximity].distance = 0.000000
I/power ( 250): *** set_screen_state 0
I/PowerManagerService( 250): setScreenState: screen_state=false mPartialCount=2err=0
I/PowerManagerService( 250): mLocks 032MsmsPhoneApp
I/PowerManagerService( 250): mLocks 11EmergencyCallHelper
I/PowerManagerService( 250): mLocks 21GSM
I/PowerManagerService( 250): mLocks 3268435482MsmsPhoneApp
D/SurfaceFlinger( 87): About to give-up screen, flinger = 0x1671960
E/libEGL ( 87): validate_display:188 error 3008 (EGL_BAD_DISPLAY)
D/Sensors ( 250): PlsSensor::enable en=0; newState=0; what=0; mEnabled=3
D/Sensors ( 250): PlsSensor::enable what=0; flags=0; err=0
D/Sensors ( 250): PlsSensor::mEnabled=0x2
V/PowerManagerService( 250): unregisterListener mLightListenerKB
I/PowerManagerService( 250): mLocks 032MsmsPhoneApp
I/PowerManagerService( 250): mLocks 11EmergencyCallHelper
I/PowerManagerService( 250): mLocks 21GSM
I/PowerManagerService( 250): mLocks 3268435482MsmsPhoneApp
D/KeyguardViewMediator( 250): onScreenTurnedOff(4)
D/PowerManagerService( 250): acquireWakeLock flags=0x1 tag=sleep_broadcast
I/WindowManager( 250): PhoneWindowManager screenTurnedOff is run and why =4

我们可以看到每次屏幕关闭都会调用到D/KeyguardViewMediator( 250): onScreenTurnedOff(*)
根据这里的参数，我们便可以知道每次屏幕关闭时是基于什么原因
以下是每个数字的含义
~/mywork/403-sync/frameworks/base/core/java/android/view/WindowManagerPolicy.java
416 // NOTE: screen off reasons are in order of significance, with more
417 // important ones lower than less important ones.
418
419 /** Screen turned off because of a device admin */
420 public final int OFF_BECAUSE_OF_ADMIN = 1;
421 /** Screen turned off because of power button */
422 public final int OFF_BECAUSE_OF_USER = 2;
423 /** Screen turned off because of timeout */
424 public final int OFF_BECAUSE_OF_TIMEOUT = 3;
425 /** Screen turned off because of proximity sensor */
426 public final int OFF_BECAUSE_OF_PROX_SENSOR = 4;
427

打电话时p-sensor的遮挡移除后屏幕点亮的log如下：
D/Sensors ( 250): PlsSensor: mPendingEvents[Proximity].distance = 1.000000
I/power ( 250): *** set_screen_state 1
I/PowerManagerService( 250): setScreenState: screen_state=true mPartialCount=2err=0
I/PowerManagerService( 250): mLocks 032MsmsPhoneApp
I/PowerManagerService( 250): mLocks 11EmergencyCallHelper
I/PowerManagerService( 250): mLocks 21GSM
I/PowerManagerService( 250): mLocks 3268435482MsmsPhoneApp
D/Sensors ( 250): PlsSensor::enable en=1; newState=1; what=0; mEnabled=2
D/Sensors ( 250): PlsSensor::enable what=0; flags=1; err=0
D/Sensors ( 250): PlsSensor::mEnabled=0x3
V/PowerManagerService( 250): registerListener mLightListenerKB
I/PowerManagerService( 250): mLocks 032MsmsPhoneApp
I/PowerManagerService( 250): mLocks 11EmergencyCallHelper
I/PowerManagerService( 250): mLocks 21GSM
I/PowerManagerService( 250): mLocks 3268435482MsmsPhoneApp
D/KeyguardViewMediator( 250): onScreenTurnedOn, seq = 2
D/KeyguardViewMediator( 250): notifyScreenOnLocked
D/KeyguardViewMediator( 250): handleNotifyScreenOn
D/PowerManagerService( 250): acquireWakeLock flags=0x1 tag=sleep_broadcast
I/WindowManager( 250): No lock screen!
D/InCallScreen( 603): onResume()...
D/InCallUiState( 603): dumpState():
D/InCallUiState( 603): - showDialpad: false
D/InCallUiState( 603): - pending call status code: none
D/InCallUiState( 603): - progressIndication: NONE
D/InCallUiState( 603): - provider overlay: none
D/InCallUiState( 603): - latestActiveCallOrigin: com.android.contacts.activities.DialtactsActivity
D/PhoneApp( 603): setIgnoreTouchUserActivity(true)...
D/NotificationMgr( 603): updateStatusBar: state = 0x50000
D/NotificationMgr( 603): updateInCallNotification(allowFullScreenIntent = false)...
D/TD ( 603): VideoCT: IDLE CT: OFFHOOK
D/TD ( 603): VideoCT: IDLE CT: OFFHOOK
D/TD ( 603): VideoCT: IDLE CT: IDLE

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