and5.1PowerManagerService深入分析（一） PMS的初始化以及低功耗模式
之前已经分析过PMS了，但是不是非常详细。
现在准备详细的分析下PMS。
一、构造函数
先看下构造函数：
public PowerManagerService(Context context) {
super(context);
mContext = context;
mHandlerThread = new ServiceThread(TAG,
Process.THREAD_PRIORITY_DISPLAY, false /*allowIo*/);
mHandlerThread.start();
mHandler = new PowerManagerHandler(mHandlerThread.getLooper());//新建一个handler，并且handler的线程也是新建的
synchronized (mLock) {
mWakeLockSuspendBlocker = createSuspendBlockerLocked("PowerManagerService.WakeLocks");//通过JNI调用底层的wakelock函数
mDisplaySuspendBlocker = createSuspendBlockerLocked("PowerManagerService.Display");
mDisplaySuspendBlocker.acquire();//持锁
mHoldingDisplaySuspendBlocker = true;
mHalAutoSuspendModeEnabled = false;
mHalInteractiveModeEnabled = true;
mWakefulness = WAKEFULNESS_AWAKE;//mWakefulness 初始状态
nativeInit();
nativeSetAutoSuspend(false);
nativeSetInteractive(true);
}
}先看下createSuspendBlockerLocked函数
private SuspendBlocker createSuspendBlockerLocked(String name) {
SuspendBlocker suspendBlocker = new SuspendBlockerImpl(name);
mSuspendBlockers.add(suspendBlocker);
return suspendBlocker;
}再看下SuspendBlockerImpl 函数，其中acquire，是通过JNI
private final class SuspendBlockerImpl implements SuspendBlocker {
private final String mName;
private final String mTraceName;
private int mReferenceCount;
public SuspendBlockerImpl(String name) {
mName = name;
mTraceName = "SuspendBlocker (" + name + ")";
}
@Override
protected void finalize() throws Throwable {
try {
if (mReferenceCount != 0) {
Slog.wtf(TAG, "Suspend blocker \"" + mName
+ "\" was finalized without being released!");
mReferenceCount = 0;
nativeReleaseSuspendBlocker(mName);
Trace.asyncTraceEnd(Trace.TRACE_TAG_POWER, mTraceName, 0);
}
} finally {
super.finalize();
}
}
@Override
public void acquire() {
synchronized (this) {
mReferenceCount += 1;
if (mReferenceCount == 1) {
if (DEBUG_SPEW) {
Slog.d(TAG, "Acquiring suspend blocker \"" + mName + "\".");
}
Trace.asyncTraceBegin(Trace.TRACE_TAG_POWER, mTraceName, 0);
nativeAcquireSuspendBlocker(mName);
}
}
}static void nativeAcquireSuspendBlocker(JNIEnv *env, jclass clazz, jstring nameStr) {
ScopedUtfChars name(env, nameStr);
acquire_wake_lock(PARTIAL_WAKE_LOCK, name.c_str());
}nativeInit也类似初始的时候写入cpu节点值。我们先看下jni
static void nativeInit(JNIEnv* env, jobject obj) {
gPowerManagerServiceObj = env->NewGlobalRef(obj);
status_t err = hw_get_module(POWER_HARDWARE_MODULE_ID,
(hw_module_t const**)&gPowerModule);
if (!err) {
gPowerModule->init(gPowerModule);
} else {
ALOGE("Couldn't load %s module (%s)", POWER_HARDWARE_MODULE_ID, strerror(-err));
}
}我们再看下power module的初始化：
struct lc_power_module HAL_MODULE_INFO_SYM = {
base: {
common: {
tag: HARDWARE_MODULE_TAG,
module_api_version: POWER_MODULE_API_VERSION_0_2,
hal_api_version: HARDWARE_HAL_API_VERSION,
id: POWER_HARDWARE_MODULE_ID,
name: "LC Power HAL",
author: "Leadcore Technology Co.,Ltd",
methods: &power_module_methods,
},
init: power_init,
setInteractive: lc_power_set_interactive,
powerHint: lc_power_hint,
},
..........
};
init函数对应power_init函数
static void power_init(struct power_module *module)
{
ALOGV("%s", __func__);
power_init_internal(module);
}power_init函数又调用了power_init_internal函数
void power_init_internal(struct power_module *module)
{
char buf[MAX_LENGTH];
int len = 0;
struct lc_power_module *lc = (struct lc_power_module *) module;
if (lc->power_lc_inited) {
ALOGD_IF(lc->log_hint, "Power HAL is inited!");
return;
}
char property[PROPERTY_VALUE_MAX];
if(property_get("debug.power.loghint", property, "0") > 0) {
if(atoi(property) == 1) {
lc->log_hint = 1;
ALOGI("enable power hint log!");
}
}
len = sizeof(buf);
sysfs_read("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq", buf, &len);
buf[len-1] = '\0';
ALOGD_IF(lc->log_hint, "cpuinfo_max_freq %s readlen=%d", buf, len);
if (atoi(buf) != 0) {
lc->cpu_max_freq = atoi(buf);
}
if(system("set_middle_performance.sh"))
{
ALOGW("failed to run shell script!");
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/timer_rate",
"40000");
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/timer_slack",
"50000");
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/min_sample_time",
"40000");
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/above_hispeed_delay",
"1");
}
if(lc->cpu_max_freq == 1599000) {
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/hispeed_freq",
HISPEED_FREQ_1_6);
} else if(lc->cpu_max_freq == 1807000) {
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/hispeed_freq",
HISPEED_FREQ_1_8);
} else if(lc->cpu_max_freq == 1495000) {
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/hispeed_freq",
HISPEED_FREQ_1_5);
} else {
ALOGW("unknown cpu frequency %d", lc->cpu_max_freq);
}
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/boostpulse_duration",
BOOSTPULSE_DURATION);
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/io_is_busy", "1");
sysfs_write("/sys/module/comip_hotplug/parameters/load_h0", "15");
sysfs_write("/sys/module/comip_hotplug/parameters/load_h1", "30");
sysfs_write("/sys/module/comip_hotplug/parameters/load_h2", "55");
sysfs_write("/sys/module/comip_hotplug/parameters/load_l1", "15");
sysfs_write("/sys/module/comip_hotplug/parameters/load_l2", "28");
sysfs_write("/sys/module/comip_hotplug/parameters/load_l3", "50");
sysfs_write("/sys/devices/platform/comip-hotplug/hotplug/boost_duration",
BOOSTPULSE_DURATION_HOTPLUG); //boost duration 1s
lasthint = 0;
activity_hint = 0;
camera_hint = 0;
ALOGD_IF(lc->log_hint, "%s done\n", __func__);
}
nativeSetInteractive也是通过JNI，最后调到这里，当然各个hardware都有自己的实现方式。这个函数里面只是在cpu的节点里面写入一些值。
static void lc_power_set_interactive(struct power_module *module, int on)
{
char buf[100];
int len;
/*
* Lower maximum frequency when screen is off. CPU 0 and 1 share a
* cpufreq policy.
*/
//sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq",
// on ? "1599000" : "799500");
if(on) {
len = sizeof(buf);
sysfs_read("/sys/devices/platform/mali.0/perf_level", buf, &len);
buf[len-1] = '\0';
ALOGD_IF(log_hint, "interactive on gpu pref_level %s\n", buf);
if(atoi(buf) == 2) {
system("set_middle_performance.sh");
} else if(atoi(buf) == 3) {
system("set_high_performance.sh");
}
} else {
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/timer_rate",
"60000");
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/timer_slack",
"50000");
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/min_sample_time",
"1");
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/interactive/above_hispeed_delay",
"1");
}
ALOGD("power_set_interactive: %d done\n", on);
}二、onStart函数
下面是走onStart函数，将BinderService和localServicepublish出去，同时将自己和handler加入watchdog中。
@Override
public void onStart() {
publishBinderService(Context.POWER_SERVICE, new BinderService());
publishLocalService(PowerManagerInternal.class, new LocalService());
Watchdog.getInstance().addMonitor(this);
Watchdog.getInstance().addThread(mHandler);
}三、systemReady函数
下面走的是systemReady函数
public void systemReady(IAppOpsService appOps) {
synchronized (mLock) {
mSystemReady = true;//成员变量置位
mAppOps = appOps;
mDreamManager = getLocalService(DreamManagerInternal.class);
mDisplayManagerInternal = getLocalService(DisplayManagerInternal.class);
mPolicy = getLocalService(WindowManagerPolicy.class);
mBatteryManagerInternal = getLocalService(BatteryManagerInternal.class);
PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
mScreenBrightnessSettingMinimum = pm.getMinimumScreenBrightnessSetting();
mScreenBrightnessSettingMaximum = pm.getMaximumScreenBrightnessSetting();
mScreenBrightnessSettingDefault = pm.getDefaultScreenBrightnessSetting();
SensorManager sensorManager = new SystemSensorManager(mContext, mHandler.getLooper());
// The notifier runs on the system server's main looper so as not to interfere
// with the animations and other critical functions of the power manager.
mBatteryStats = BatteryStatsService.getService();
mNotifier = new Notifier(Looper.getMainLooper(), mContext, mBatteryStats,
mAppOps, createSuspendBlockerLocked("PowerManagerService.Broadcasts"),
mPolicy);
mWirelessChargerDetector = new WirelessChargerDetector(sensorManager,
createSuspendBlockerLocked("PowerManagerService.WirelessChargerDetector"),
mHandler);
mSettingsObserver = new SettingsObserver(mHandler);
mLightsManager = getLocalService(LightsManager.class);
mAttentionLight = mLightsManager.getLight(LightsManager.LIGHT_ID_ATTENTION);
// Initialize display power management.
mDisplayManagerInternal.initPowerManagement(
mDisplayPowerCallbacks, mHandler, sensorManager);
// Register for broadcasts from other components of the system.
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_BATTERY_CHANGED);
filter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);
mContext.registerReceiver(new BatteryReceiver(), filter, null, mHandler);//接受电池变化的广播
filter = new IntentFilter();
filter.addAction(Intent.ACTION_DREAMING_STARTED);
filter.addAction(Intent.ACTION_DREAMING_STOPPED);
mContext.registerReceiver(new DreamReceiver(), filter, null, mHandler);//接受做梦结束或者开始的广播
filter = new IntentFilter();
filter.addAction(Intent.ACTION_USER_SWITCHED);
mContext.registerReceiver(new UserSwitchedReceiver(), filter, null, mHandler);//用户切换的广播
filter = new IntentFilter();
filter.addAction(Intent.ACTION_DOCK_EVENT);
mContext.registerReceiver(new DockReceiver(), filter, null, mHandler);
// Register for settings changes.
final ContentResolver resolver = mContext.getContentResolver();
resolver.registerContentObserver(Settings.Secure.getUriFor(//这个是注册每个Settings数据库中值的一个观察者，一旦值有变就会调用mSettingsObserver
Settings.Secure.SCREENSAVER_ENABLED),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Secure.getUriFor(
Settings.Secure.SCREENSAVER_ACTIVATE_ON_SLEEP),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Secure.getUriFor(
Settings.Secure.SCREENSAVER_ACTIVATE_ON_DOCK),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.System.getUriFor(
Settings.System.SCREEN_OFF_TIMEOUT),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Secure.getUriFor(
Settings.Secure.SLEEP_TIMEOUT),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Global.getUriFor(
Settings.Global.STAY_ON_WHILE_PLUGGED_IN),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.System.getUriFor(
Settings.System.SCREEN_BRIGHTNESS),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.System.getUriFor(
Settings.System.SCREEN_BRIGHTNESS_MODE),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.System.getUriFor(
Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Global.getUriFor(
Settings.Global.LOW_POWER_MODE),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Global.getUriFor(
Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Global.getUriFor(
Settings.Global.THEATER_MODE_ON),
false, mSettingsObserver, UserHandle.USER_ALL);
// Go.
readConfigurationLocked();
updateSettingsLocked();
mDirty |= DIRTY_BATTERY_STATE;
updatePowerStateLocked();
}
}接受电池变化的广播
private final class BatteryReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
synchronized (mLock) {
handleBatteryStateChangedLocked();
}
}
} private void handleBatteryStateChangedLocked() {
mDirty |= DIRTY_BATTERY_STATE;
updatePowerStateLocked();
} private final class DreamReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
synchronized (mLock) {
scheduleSandmanLocked();
}
}
} private void scheduleSandmanLocked() {
if (!mSandmanScheduled) {
mSandmanScheduled = true;
Message msg = mHandler.obtainMessage(MSG_SANDMAN);
msg.setAsynchronous(true);
mHandler.sendMessage(msg);//通过发送消息
}
} @Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_USER_ACTIVITY_TIMEOUT:
handleUserActivityTimeout();
break;
case MSG_SANDMAN:
handleSandman();//这个函数是对做梦的处理，后面详细分析
break;
case MSG_SCREEN_BRIGHTNESS_BOOST_TIMEOUT:
handleScreenBrightnessBoostTimeout();
break;
}
}mSettingsObserver对Setting数据库中的一些变量进行观察，一旦变化就调这个onChange这个函数。在上面的SystemReady中已经注册了各个变量的观察。
private final class SettingsObserver extends ContentObserver {
public SettingsObserver(Handler handler) {
super(handler);
}
@Override
public void onChange(boolean selfChange, Uri uri) {
synchronized (mLock) {
handleSettingsChangedLocked();
}
}
} private void handleSettingsChangedLocked() {
updateSettingsLocked();//更新各个设置参数
updatePowerStateLocked();//更新power状态，后面详细分析
} private void updateSettingsLocked() {
final ContentResolver resolver = mContext.getContentResolver();
mDreamsEnabledSetting = (Settings.Secure.getIntForUser(resolver,
Settings.Secure.SCREENSAVER_ENABLED,
mDreamsEnabledByDefaultConfig ? 1 : 0,
UserHandle.USER_CURRENT) != 0);
mDreamsActivateOnSleepSetting = (Settings.Secure.getIntForUser(resolver,
Settings.Secure.SCREENSAVER_ACTIVATE_ON_SLEEP,
mDreamsActivatedOnSleepByDefaultConfig ? 1 : 0,
UserHandle.USER_CURRENT) != 0);
mDreamsActivateOnDockSetting = (Settings.Secure.getIntForUser(resolver,
Settings.Secure.SCREENSAVER_ACTIVATE_ON_DOCK,
mDreamsActivatedOnDockByDefaultConfig ? 1 : 0,
UserHandle.USER_CURRENT) != 0);
mScreenOffTimeoutSetting = Settings.System.getIntForUser(resolver,
Settings.System.SCREEN_OFF_TIMEOUT, DEFAULT_SCREEN_OFF_TIMEOUT,//屏幕自动灭屏的一个timeout
UserHandle.USER_CURRENT);
mSleepTimeoutSetting = Settings.Secure.getIntForUser(resolver,
Settings.Secure.SLEEP_TIMEOUT, DEFAULT_SLEEP_TIMEOUT,
UserHandle.USER_CURRENT);
mStayOnWhilePluggedInSetting = Settings.Global.getInt(resolver,
Settings.Global.STAY_ON_WHILE_PLUGGED_IN, BatteryManager.BATTERY_PLUGGED_AC);
mTheaterModeEnabled = Settings.Global.getInt(mContext.getContentResolver(),
Settings.Global.THEATER_MODE_ON, 0) == 1;
final int oldScreenBrightnessSetting = mScreenBrightnessSetting;
mScreenBrightnessSetting = Settings.System.getIntForUser(resolver,
Settings.System.SCREEN_BRIGHTNESS, mScreenBrightnessSettingDefault,
UserHandle.USER_CURRENT);
if (oldScreenBrightnessSetting != mScreenBrightnessSetting) {
mTemporaryScreenBrightnessSettingOverride = -1;
}
final float oldScreenAutoBrightnessAdjustmentSetting =
mScreenAutoBrightnessAdjustmentSetting;
mScreenAutoBrightnessAdjustmentSetting = Settings.System.getFloatForUser(resolver,
Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ, 0.0f,
UserHandle.USER_CURRENT);
if (oldScreenAutoBrightnessAdjustmentSetting != mScreenAutoBrightnessAdjustmentSetting) {
mTemporaryScreenAutoBrightnessAdjustmentSettingOverride = Float.NaN;
}
mScreenBrightnessModeSetting = Settings.System.getIntForUser(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL, UserHandle.USER_CURRENT);
final boolean lowPowerModeEnabled = Settings.Global.getInt(resolver,
Settings.Global.LOW_POWER_MODE, 0) != 0;//低功耗模式
final boolean autoLowPowerModeConfigured = Settings.Global.getInt(resolver,//低功耗自动模式
Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL, 0) != 0;
if (lowPowerModeEnabled != mLowPowerModeSetting//两种模式其中一个改变了就调用updateLowPowerModeLocked函数
|| autoLowPowerModeConfigured != mAutoLowPowerModeConfigured) {
mLowPowerModeSetting = lowPowerModeEnabled;
mAutoLowPowerModeConfigured = autoLowPowerModeConfigured;
updateLowPowerModeLocked();
}
mDirty |= DIRTY_SETTINGS;//Dirty的DIRTY_SETTINGS改变了
}
四、省电模式
下面分析下updateLowPowerModeLocked函数
void updateLowPowerModeLocked() {
if (mIsPowered && mLowPowerModeSetting) {//如果当前插着电源，并且mLowPowerModeSetting为true。也是不能开启低功耗的，将其改为fasle，存入setting
if (DEBUG_SPEW) {
Slog.d(TAG, "updateLowPowerModeLocked: powered, turning setting off");
}
// Turn setting off if powered
Settings.Global.putInt(mContext.getContentResolver(),
Settings.Global.LOW_POWER_MODE, 0);
mLowPowerModeSetting = false;
}
final boolean autoLowPowerModeEnabled = !mIsPowered && mAutoLowPowerModeConfigured//自动模式开启需要四个。没有充电、开启自动配置、mAutoLowPowerModeSnoozing为false、低电量
&& !mAutoLowPowerModeSnoozing && mBatteryLevelLow;
final boolean lowPowerModeEnabled = mLowPowerModeSetting || autoLowPowerModeEnabled;//主动的低电量模式只要开启，不在充电就可以了；主动模式和自动模式两者满足其一，就开启低电量模式
if (mLowPowerModeEnabled != lowPowerModeEnabled) {
mLowPowerModeEnabled = lowPowerModeEnabled;
powerHintInternal(POWER_HINT_LOW_POWER, lowPowerModeEnabled ? 1 : 0);//将低功耗模式，以及是否开启通过JNI，到hardware的power模块，但是我们hardware的power模块好像还不支持低功耗模式
BackgroundThread.getHandler().post(new Runnable() {//在消息线程里面处理
@Override
public void run() {
Intent intent = new Intent(PowerManager.ACTION_POWER_SAVE_MODE_CHANGING)//发送正在处理低功耗的广播
.putExtra(PowerManager.EXTRA_POWER_SAVE_MODE, mLowPowerModeEnabled)
.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
mContext.sendBroadcast(intent);
ArrayList listeners;
synchronized (mLock) {
listeners = new ArrayList(
mLowPowerModeListeners);
}
for (int i=0; i 通过binder接口setPowerSaveMode设置低功耗模式
@Override // Binder call
public boolean setPowerSaveMode(boolean mode) {
mContext.enforceCallingOrSelfPermission(
android.Manifest.permission.DEVICE_POWER, null);
final long ident = Binder.clearCallingIdentity();
try {
return setLowPowerModeInternal(mode);
} finally {
Binder.restoreCallingIdentity(ident);
}
}setLowPowerModeInternal函数，如果在充电直接返回
private boolean setLowPowerModeInternal(boolean mode) {
synchronized (mLock) {
if (DEBUG) Slog.d(TAG, "setLowPowerModeInternal " + mode + " mIsPowered=" + mIsPowered);
if (mIsPowered) {
return false;
}
Settings.Global.putInt(mContext.getContentResolver(),//将手动模式保存
Settings.Global.LOW_POWER_MODE, mode ? 1 : 0);
mLowPowerModeSetting = mode;
if (mAutoLowPowerModeConfigured && mBatteryLevelLow) {//如果自动模式开启，并且低电量的时候
if (mode && mAutoLowPowerModeSnoozing) {
if (DEBUG_SPEW) {
Slog.d(TAG, "setLowPowerModeInternal: clearing low power mode snooze");
}
mAutoLowPowerModeSnoozing = false; //这个参数为false，是自动低功耗模式开启的必要条件
} else if (!mode && !mAutoLowPowerModeSnoozing) {
if (DEBUG_SPEW) {
Slog.d(TAG, "setLowPowerModeInternal: snoozing low power mode");
}
mAutoLowPowerModeSnoozing = true;
}
}
updateLowPowerModeLocked();//更新低功耗模式
return true;
}
}低功耗模式可以通过setPowerSaveMode接口设置，也可以通过Setting中的数据库监听来设置。
而当省电模式改变时，又有两种模式通知，一种是发广播，另一种的通知回调。上面在updateLowPowerModeLocked已经有描述。
注册回调的接口
@Override
public void registerLowPowerModeObserver(LowPowerModeListener listener) {
synchronized (mLock) {
mLowPowerModeListeners.add(listener);
}
}下面我们来看看到底会通知那些服务或者应用。
1.回调通知
在NetworkPolicyManagerService会监听，进入省电模式后，网络切断。
BatteryStatsService、VibratorService、WindowManagerService(不放动画)也会处理。
2.广播通知
而广播的是GpsLocationProvider(关闭Gps)，PowerUI(显示通知栏等)、声音处理等。
五、继续systemReady函数
继续分析systemReady函数:
readConfigurationLocked();//读取资源中的配置信息
updateSettingsLocked();
mDirty |= DIRTY_BATTERY_STATE;//修改mDirty 状态
updatePowerStateLocked();//更新power状态
}
}readConfigurationLocked函数
private void readConfigurationLocked() {
final Resources resources = mContext.getResources();
mDecoupleHalAutoSuspendModeFromDisplayConfig = resources.getBoolean(
com.android.internal.R.bool.config_powerDecoupleAutoSuspendModeFromDisplay);
mDecoupleHalInteractiveModeFromDisplayConfig = resources.getBoolean(
com.android.internal.R.bool.config_powerDecoupleInteractiveModeFromDisplay);
mWakeUpWhenPluggedOrUnpluggedConfig = resources.getBoolean(
com.android.internal.R.bool.config_unplugTurnsOnScreen);
mWakeUpWhenPluggedOrUnpluggedInTheaterModeConfig = resources.getBoolean(
com.android.internal.R.bool.config_allowTheaterModeWakeFromUnplug);
mSuspendWhenScreenOffDueToProximityConfig = resources.getBoolean(
com.android.internal.R.bool.config_suspendWhenScreenOffDueToProximity);
mDreamsSupportedConfig = resources.getBoolean(
com.android.internal.R.bool.config_dreamsSupported);
mDreamsEnabledByDefaultConfig = resources.getBoolean(
com.android.internal.R.bool.config_dreamsEnabledByDefault);
mDreamsActivatedOnSleepByDefaultConfig = resources.getBoolean(
com.android.internal.R.bool.config_dreamsActivatedOnSleepByDefault);
mDreamsActivatedOnDockByDefaultConfig = resources.getBoolean(
com.android.internal.R.bool.config_dreamsActivatedOnDockByDefault);
mDreamsEnabledOnBatteryConfig = resources.getBoolean(
com.android.internal.R.bool.config_dreamsEnabledOnBattery);
mDreamsBatteryLevelMinimumWhenPoweredConfig = resources.getInteger(
com.android.internal.R.integer.config_dreamsBatteryLevelMinimumWhenPowered);
mDreamsBatteryLevelMinimumWhenNotPoweredConfig = resources.getInteger(
com.android.internal.R.integer.config_dreamsBatteryLevelMinimumWhenNotPowered);
mDreamsBatteryLevelDrainCutoffConfig = resources.getInteger(
com.android.internal.R.integer.config_dreamsBatteryLevelDrainCutoff);
mDozeAfterScreenOffConfig = resources.getBoolean(
com.android.internal.R.bool.config_dozeAfterScreenOff);
mMinimumScreenOffTimeoutConfig = resources.getInteger(
com.android.internal.R.integer.config_minimumScreenOffTimeout);
mMaximumScreenDimDurationConfig = resources.getInteger(
com.android.internal.R.integer.config_maximumScreenDimDuration);
mMaximumScreenDimRatioConfig = resources.getFraction(
com.android.internal.R.fraction.config_maximumScreenDimRatio, 1, 1);
}