1、设置界面

packages/apps/Settings/src/com/android/settings/display/ScreenTimeoutSettings.java
packages/apps/Settings/res/xml/screen_timeout_settings.xml

12-16 12:13:54.707  7976  7976 D SettingsActivity: Switching to fragment com.android.settings.display.ScreenTimeoutSettings

1.2 属性值

Settings.System.SCREEN_OFF_TIMEOUT

adb shell settings get System screen_off_timeout

packages/apps/Settings/res/values/arrays.xml

    <!-- Display settings.  The delay in inactivity before the screen is turned off. These are shown in a list dialog. --><string-array name="screen_timeout_entries"><item>15 seconds</item><item>30 seconds</item><item>1 minute</item><item>2 minutes</item><item>5 minutes</item><item>10 minutes</item><item>30 minutes</item></string-array><!-- Do not translate. --><string-array name="screen_timeout_values" translatable="false"><!-- Do not translate. --><item>15000</item><!-- Do not translate. --><item>30000</item><!-- Do not translate. --><item>60000</item><!-- Do not translate. --><item>120000</item><!-- Do not translate. --><item>300000</item><!-- Do not translate. --><item>600000</item><!-- Do not translate. --><item>1800000</item></string-array>

1.2.1 默认值

def_screen_off_timeout : frameworks/base/packages/SettingsProvider/res/values/defaults.xml

frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java

    private void loadSystemSettings(SQLiteDatabase db) {SQLiteStatement stmt = null;try {stmt = db.compileStatement("INSERT OR IGNORE INTO system(name,value)"+ " VALUES(?,?);");loadBooleanSetting(stmt, Settings.System.DIM_SCREEN,R.bool.def_dim_screen);loadIntegerSetting(stmt, Settings.System.SCREEN_OFF_TIMEOUT,R.integer.def_screen_off_timeout);// Set default cdma DTMF typeloadSetting(stmt, Settings.System.DTMF_TONE_TYPE_WHEN_DIALING, 0);// Set default hearing aidloadSetting(stmt, Settings.System.HEARING_AID, 0);// Set default tty modeloadSetting(stmt, Settings.System.TTY_MODE, 0);loadIntegerSetting(stmt, Settings.System.SCREEN_BRIGHTNESS,R.integer.def_screen_brightness);loadIntegerSetting(stmt, Settings.System.SCREEN_BRIGHTNESS_FOR_VR,com.android.internal.R.integer.config_screenBrightnessForVrSettingDefault);loadBooleanSetting(stmt, Settings.System.SCREEN_BRIGHTNESS_MODE,R.bool.def_screen_brightness_automatic_mode);loadBooleanSetting(stmt, Settings.System.ACCELEROMETER_ROTATION,R.bool.def_accelerometer_rotation);loadIntegerSetting(stmt, Settings.System.USER_ROTATION, R.integer.def_user_rotation);loadDefaultHapticSettings(stmt);loadBooleanSetting(stmt, Settings.System.NOTIFICATION_LIGHT_PULSE,R.bool.def_notification_pulse);loadUISoundEffectsSettings(stmt);loadIntegerSetting(stmt, Settings.System.POINTER_SPEED,R.integer.def_pointer_speed);/** IMPORTANT: Do not add any more upgrade steps here as the global,* secure, and system settings are no longer stored in a database* but are kept in memory and persisted to XML.** See: SettingsProvider.UpgradeController#onUpgradeLocked*/} finally {if (stmt != null) stmt.close();}}

frameworks/base/packages/SettingsProvider/res/values/defaults.xml

<integer name="def_screen_off_timeout">60000</integer>

1.2.2 最小值限制

frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java

mMinimumScreenOffTimeoutConfig = resources.getInteger(com.android.internal.R.integer.config_minimumScreenOffTimeout);
Math.max(timeout, mMinimumScreenOffTimeoutConfig);

1.3 属性值疑问 Settings.System.SCREEN_OFF_TIMEOUT

在设置屏幕超时代码代码中，最大值可以为“Long.MAX_VALUE”，属性设置Settings.System.putLong(context.getContentResolver(), SCREEN_OFF_TIMEOUT, value);，但是实质最大值只能是Integer.MAX_VALUE（2147483647）；该属性实质在fwk中是Integer保存，获取方式mScreenOffTimeoutSetting = Settings.System.getIntForUser(resolver, Settings.System.SCREEN_OFF_TIMEOUT, DEFAULT_SCREEN_OFF_TIMEOUT, UserHandle.USER_CURRENT);


frameworks/base/packages/SettingsProvider/src/android/provider/settings/validators/SettingsValidators.java 中 NON_NEGATIVE_INTEGER_VALIDATOR 检查非法值

    private Long getMaxScreenTimeout(Context context) {if (context == null) {return Long.MAX_VALUE;}final DevicePolicyManager dpm = context.getSystemService(DevicePolicyManager.class);if (dpm == null) {return Long.MAX_VALUE;}mAdmin = RestrictedLockUtilsInternal.checkIfMaximumTimeToLockIsSet(context);if (mAdmin != null) {return dpm.getMaximumTimeToLock(null /* admin */, UserHandle.myUserId());}return Long.MAX_VALUE;}private String getCurrentSystemScreenTimeout(Context context) {if (context == null) {return Long.toString(FALLBACK_SCREEN_TIMEOUT_VALUE);} else {return Long.toString(Settings.System.getLong(context.getContentResolver(),SCREEN_OFF_TIMEOUT, FALLBACK_SCREEN_TIMEOUT_VALUE));}}private void setCurrentSystemScreenTimeout(Context context, String key) {try {if (context != null) {final long value = Long.parseLong(key);mMetricsFeatureProvider.action(context, SettingsEnums.ACTION_SCREEN_TIMEOUT_CHANGED,(int) value);Settings.System.putLong(context.getContentResolver(), SCREEN_OFF_TIMEOUT, value);}} catch (NumberFormatException e) {Log.e(TAG, "could not persist screen timeout setting", e);}}

2、超时灭屏

2.1 锁定屏幕的超时

更新延时 mLockScreenTimeout 执行 mScreenLockTimeout

frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

mLockScreenTimeout = Settings.System.getIntForUser(resolver,Settings.System.SCREEN_OFF_TIMEOUT, 0, UserHandle.USER_CURRENT);
mHandler.postDelayed(mScreenLockTimeout, mLockScreenTimeout);class ScreenLockTimeout implements Runnable {Bundle options;@Overridepublic void run() {synchronized (this) {if (localLOGV) Log.v(TAG, "mScreenLockTimeout activating keyguard");if (mKeyguardDelegate != null) {mKeyguardDelegate.doKeyguardTimeout(options);}mLockScreenTimerActive = false;mLockNowPending = false;options = null;}}public void setLockOptions(Bundle options) {this.options = options;}}

2.2 屏幕灭屏的超时

updateUserActivitySummaryLocked更新mUserActivitySummary的值，用户活动超时时调用updateUserActivitySummaryLocked，这里获取getScreenOffTimeoutLocked状态更新

frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java

mScreenOffTimeoutSetting = Settings.System.getIntForUser(resolver, Settings.System.SCREEN_OFF_TIMEOUT, DEFAULT_SCREEN_OFF_TIMEOUT, UserHandle.USER_CURRENT);@GuardedBy("mLock")private long getScreenOffTimeoutLocked(long sleepTimeout, long attentiveTimeout) {long timeout = mScreenOffTimeoutSetting;if (isMaximumScreenOffTimeoutFromDeviceAdminEnforcedLocked()) {timeout = Math.min(timeout, mMaximumScreenOffTimeoutFromDeviceAdmin);}if (mUserActivityTimeoutOverrideFromWindowManager >= 0) {timeout = Math.min(timeout, mUserActivityTimeoutOverrideFromWindowManager);}if (sleepTimeout >= 0) {timeout = Math.min(timeout, sleepTimeout);}if (attentiveTimeout >= 0) {timeout = Math.min(timeout, attentiveTimeout);}return Math.max(timeout, mMinimumScreenOffTimeoutConfig);}private void handleUserActivityTimeout() { // runs on handler threadsynchronized (mLock) {if (DEBUG_SPEW) {Slog.d(TAG, "handleUserActivityTimeout");}mDirty |= DIRTY_USER_ACTIVITY;updatePowerStateLocked();}}/*** Updates the value of mUserActivitySummary to summarize the user requested* state of the system such as whether the screen should be bright or dim.* Note that user activity is ignored when the system is asleep.** This function must have no other side-effects.*/@GuardedBy("mLock")private void updateUserActivitySummaryLocked(long now, int dirty) {// Update the status of the user activity timeout timer.if ((dirty & (DIRTY_DISPLAY_GROUP_WAKEFULNESS | DIRTY_WAKE_LOCKS | DIRTY_USER_ACTIVITY| DIRTY_WAKEFULNESS | DIRTY_SETTINGS | DIRTY_ATTENTIVE)) == 0) {return;}mHandler.removeMessages(MSG_USER_ACTIVITY_TIMEOUT);final long attentiveTimeout = getAttentiveTimeoutLocked();final long sleepTimeout = getSleepTimeoutLocked(attentiveTimeout);long screenOffTimeout = getScreenOffTimeoutLocked(sleepTimeout,attentiveTimeout);final long screenDimDuration = getScreenDimDurationLocked(screenOffTimeout);screenOffTimeout =getScreenOffTimeoutWithFaceDownLocked(screenOffTimeout, screenDimDuration);final boolean userInactiveOverride = mUserInactiveOverrideFromWindowManager;long nextTimeout = -1;boolean hasUserActivitySummary = false;for (int idx = 0; idx < mPowerGroups.size(); idx++) {int groupUserActivitySummary = 0;long groupNextTimeout = 0;final PowerGroup powerGroup = mPowerGroups.valueAt(idx);final int wakefulness = powerGroup.getWakefulnessLocked();if (wakefulness != WAKEFULNESS_ASLEEP) {final long lastUserActivityTime = powerGroup.getLastUserActivityTimeLocked();final long lastUserActivityTimeNoChangeLights =powerGroup.getLastUserActivityTimeNoChangeLightsLocked();if (lastUserActivityTime >= powerGroup.getLastWakeTimeLocked()) {groupNextTimeout = lastUserActivityTime + screenOffTimeout - screenDimDuration;if (now < groupNextTimeout) {groupUserActivitySummary = USER_ACTIVITY_SCREEN_BRIGHT;} else {groupNextTimeout = lastUserActivityTime + screenOffTimeout;if (now < groupNextTimeout) {groupUserActivitySummary = USER_ACTIVITY_SCREEN_DIM;}}}if (groupUserActivitySummary == 0 && lastUserActivityTimeNoChangeLights>= powerGroup.getLastWakeTimeLocked()) {groupNextTimeout = lastUserActivityTimeNoChangeLights + screenOffTimeout;if (now < groupNextTimeout) {if (powerGroup.isPolicyBrightLocked() || powerGroup.isPolicyVrLocked()) {groupUserActivitySummary = USER_ACTIVITY_SCREEN_BRIGHT;} else if (powerGroup.isPolicyDimLocked()) {groupUserActivitySummary = USER_ACTIVITY_SCREEN_DIM;}}}if (groupUserActivitySummary == 0) {if (sleepTimeout >= 0) {final long anyUserActivity = Math.max(lastUserActivityTime,lastUserActivityTimeNoChangeLights);if (anyUserActivity >= powerGroup.getLastWakeTimeLocked()) {groupNextTimeout = anyUserActivity + sleepTimeout;if (now < groupNextTimeout) {groupUserActivitySummary = USER_ACTIVITY_SCREEN_DREAM;}}} else {groupUserActivitySummary = USER_ACTIVITY_SCREEN_DREAM;groupNextTimeout = -1;}}if (groupUserActivitySummary != USER_ACTIVITY_SCREEN_DREAM&& userInactiveOverride) {if ((groupUserActivitySummary &(USER_ACTIVITY_SCREEN_BRIGHT | USER_ACTIVITY_SCREEN_DIM)) != 0) {// Device is being kept awake by recent user activityif (mOverriddenTimeout == -1) {// Save when the next timeout would have occurredmOverriddenTimeout = groupNextTimeout;}}groupUserActivitySummary = USER_ACTIVITY_SCREEN_DREAM;groupNextTimeout = -1;}if ((groupUserActivitySummary & USER_ACTIVITY_SCREEN_BRIGHT) != 0&& (powerGroup.getWakeLockSummaryLocked()& WAKE_LOCK_STAY_AWAKE) == 0) {groupNextTimeout = mAttentionDetector.updateUserActivity(groupNextTimeout,screenDimDuration);}if (isAttentiveTimeoutExpired(powerGroup, now)) {groupUserActivitySummary = 0;groupNextTimeout = -1;}hasUserActivitySummary |= groupUserActivitySummary != 0;if (nextTimeout == -1) {nextTimeout = groupNextTimeout;} else if (groupNextTimeout != -1) {nextTimeout = Math.min(nextTimeout, groupNextTimeout);}}powerGroup.setUserActivitySummaryLocked(groupUserActivitySummary);if (DEBUG_SPEW) {Slog.d(TAG, "updateUserActivitySummaryLocked: groupId=" + powerGroup.getGroupId()+ ", mWakefulness=" + wakefulnessToString(wakefulness)+ ", mUserActivitySummary=0x" + Integer.toHexString(groupUserActivitySummary)+ ", nextTimeout=" + TimeUtils.formatUptime(groupNextTimeout));}}final long nextProfileTimeout = getNextProfileTimeoutLocked(now);if (nextProfileTimeout > 0) {nextTimeout = Math.min(nextTimeout, nextProfileTimeout);}if (hasUserActivitySummary && nextTimeout >= 0) {scheduleUserInactivityTimeout(nextTimeout);}}private void scheduleUserInactivityTimeout(long timeMs) {final Message msg = mHandler.obtainMessage(MSG_USER_ACTIVITY_TIMEOUT);msg.setAsynchronous(true);mHandler.sendMessageAtTime(msg, timeMs);}

3、永不休眠

• 1. 在 PowerManagerService 和 PhoneWindowManager 处理
• 2. 直接配置 Settings.System.SCREEN_OFF_TIMEOUT 为Integer.MAX_VALUE（ 2147483647 = 24.855 天 一般没有这么长时间亮屏待机 ），设置更长时间替换 Settings.System.SCREEN_OFF_TIMEOUT属性 VALIDATORS.put(System.SCREEN_OFF_TIMEOUT, NON_NEGATIVE_INTEGER_VALIDATOR) 中NON_NEGATIVE_INTEGER_VALIDATOR检测为NONE_NEGATIVE_LONG_VALIDATOR

* 关键日志

SettingsActivity:|SubSettings: Launching fragment|start u|ScreenTimeout:|sysui_multi_action: \[757,1754|screen_toggled:|sysui_multi_action:.*screen_timeout|power_screen_state:|PowerManagerService: Waking up|PowerManagerService: Going to sleep

sysui_multi_action: [757,1754,758,4,759,15000]
sysui_multi_action: [757,1754,758,4,759,30000]
sysui_multi_action: [757,1754,758,4,759,60000]
sysui_multi_action: [757,1754,758,4,759,120000]
sysui_multi_action: [757,1754,758,4,759,300000]
sysui_multi_action: [757,1754,758,4,759,600000]
sysui_multi_action: [757,1754,758,4,759,1800000]

12-17 07:13:37.536   645   678 I ActivityTaskManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000100 cmp=com.google.android.apps.nexuslauncher/.NexusLauncherActivity (has extras)} from uid 0
12-17 07:13:40.128   645  2427 I ActivityTaskManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.android.settings/.Settings bnds=[581,351][858,771]} from uid 10149
12-17 07:13:46.309   645  2510 I ActivityTaskManager: START u0 {act=android.intent.action.MAIN cmp=com.android.settings/.SubSettings (has extras)} from uid 1000
12-17 07:13:46.408  7976  7976 D SettingsActivity: Switching to fragment com.android.settings.DisplaySettings
12-17 07:13:46.409  7976  7976 D SubSettings: Launching fragment com.android.settings.DisplaySettings
12-17 07:13:48.942  7976  7976 I sysui_multi_action: [757,830,758,4,833,0,854,screen_timeout,1089,0]
12-17 07:13:48.948   645  1716 I ActivityTaskManager: START u0 {act=android.intent.action.MAIN cmp=com.android.settings/.SubSettings (has extras)} from uid 1000
12-17 07:13:49.036  7976  7976 D SettingsActivity: Switching to fragment com.android.settings.display.ScreenTimeoutSettings
12-17 07:13:49.037  7976  7976 D SubSettings: Launching fragment com.android.settings.display.ScreenTimeoutSettings
12-17 07:13:50.690  7976  7976 I sysui_multi_action: [757,1754,758,4,759,15000]
12-17 07:13:52.884  7976  7976 I sysui_multi_action: [757,1754,758,4,759,30000]
12-17 07:13:54.152  7976  7976 I sysui_multi_action: [757,1754,758,4,759,60000]
12-17 07:13:55.559  7976  7976 I sysui_multi_action: [757,1754,758,4,759,120000]
12-17 07:13:57.041  7976  7976 I sysui_multi_action: [757,1754,758,4,759,300000]
12-17 07:13:58.400  7976  7976 I sysui_multi_action: [757,1754,758,4,759,600000]
12-17 07:13:59.653  7976  7976 I sysui_multi_action: [757,1754,758,4,759,1800000]
12-17 07:14:01.446  7976  7976 I sysui_multi_action: [757,1754,758,4,759,15000]
12-17 07:14:16.400   645   708 I PowerManagerService: Going to sleep due to timeout (uid 1000)...
12-17 07:14:17.032   645   645 I power_screen_state: [0,3,0,0,628]
12-17 07:14:17.032   645   645 I screen_toggled: 0
12-17 07:14:17.032   645   645 I sysui_multi_action: [757,804,799,screen_timeout,801,15,802,1]
12-17 07:14:28.765   645   793 I PowerManagerService: Waking up from Asleep (uid=1000, reason=WAKE_REASON_POWER_BUTTON, details=android.policy:POWER)...
12-17 07:14:28.770   645   645 I screen_toggled: 1
12-17 07:14:28.905   645   645 I power_screen_state: [1,0,0,0,110]