Android指示灯控制

电池指示灯

frameworks/base/core/res/res/values/config.xml

 <!-- Default value for led color when battery is low on charge -->
<integer name="config_notificationsBatteryLowARGB">0xFFFF0000</integer><!-- Default value for led color when battery is medium charged -->
<integer name="config_notificationsBatteryMediumARGB">0xFFFFFF00</integer><!-- Default value for led color when battery is fully charged -->
<integer name="config_notificationsBatteryFullARGB">0xFF00FF00</integer>

0xAABBCCDD

AA(透明度)

BB(红色)

CC(绿色)

DD(蓝色)

frameworks/base/services/core/java/com/android/server/BatteryService.java

private final class Led {private final Light mBatteryLight;private final int mBatteryLowARGB;private final int mBatteryMediumARGB;private final int mBatteryFullARGB;private final int mBatteryLedOn;private final int mBatteryLedOff;public Led(Context context, LightsManager lights) {mBatteryLight = lights.getLight(LightsManager.LIGHT_ID_BATTERY);mBatteryLowARGB = context.getResources().getInteger(com.android.internal.R.integer.config_notificationsBatteryLowARGB);mBatteryMediumARGB = context.getResources().getInteger(com.android.internal.R.integer.config_notificationsBatteryMediumARGB);mBatteryFullARGB = context.getResources().getInteger(com.android.internal.R.integer.config_notificationsBatteryFullARGB);mBatteryLedOn = context.getResources().getInteger(com.android.internal.R.integer.config_notificationsBatteryLedOn);mBatteryLedOff = context.getResources().getInteger(com.android.internal.R.integer.config_notificationsBatteryLedOff);}/*** Synchronize on BatteryService.*/public void updateLightsLocked() {final int level = mHealthInfo.batteryLevel;final int status = mHealthInfo.batteryStatus;if (level < mLowBatteryWarningLevel) {if (status == BatteryManager.BATTERY_STATUS_CHARGING) {// Solid red when battery is chargingmBatteryLight.setColor(mBatteryLowARGB);} else {// Flash red when battery is low and not chargingmBatteryLight.setFlashing(mBatteryLowARGB, Light.LIGHT_FLASH_TIMED,mBatteryLedOn, mBatteryLedOff);}} else if (status == BatteryManager.BATTERY_STATUS_CHARGING|| status == BatteryManager.BATTERY_STATUS_FULL) {if (status == BatteryManager.BATTERY_STATUS_FULL || level >= 90) {// Solid green when full or charging and nearly fullmBatteryLight.setColor(mBatteryFullARGB);} else {// Solid orange when charging and halfway fullmBatteryLight.setColor(mBatteryMediumARGB);}} else {// No lights if not charging and not lowmBatteryLight.turnOff();}}}

//充电，没充满　红灯

//充电，达到90%的电量　　绿灯

//低电量，没充电　　闪红灯

呼吸灯

应用可以设置呼吸灯的颜色，比如在熄屏状态下，qq收到消息后，手机的绿灯会闪。

frameworks/base/services/core/java/com/android/server/notification/NotificationManagerService.java

 @GuardedBy("mNotificationLock")void updateLightsLocked(){// handle notification lightsNotificationRecord ledNotification = null;while (ledNotification == null && !mLights.isEmpty()) {final String owner = mLights.get(mLights.size() - 1);ledNotification = mNotificationsByKey.get(owner);if (ledNotification == null) {Slog.wtfStack(TAG, "LED Notification does not exist: " + owner);mLights.remove(owner);}}// Don't flash while we are in a call or screen is onif (ledNotification == null || mInCall || mScreenOn) {mNotificationLight.turnOff();} else {NotificationRecord.Light light = ledNotification.getLight();if (light != null && mNotificationPulseEnabled) {// pulse repeatedlymNotificationLight.setFlashing(light.color, Light.LIGHT_FLASH_TIMED,light.onMs, light.offMs);}}}

有时需要固定呼吸灯的颜色，这样所有的呼吸灯颜色都是绿色了。

mNotificationLight.setFlashing(0xff00ff00, Light.LIGHT_FLASH_TIMED,light.onMs, light.offMs);

最终调到这里

frameworks/base/services/core/java/com/android/server/BatteryService.java

        private void setLightLocked(int color, int mode, int onMS, int offMS, int brightnessMode) {if (shouldBeInLowPersistenceMode()) {brightnessMode = BRIGHTNESS_MODE_LOW_PERSISTENCE;} else if (brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE) {brightnessMode = mLastBrightnessMode;}if (!mInitialized || color != mColor || mode != mMode || onMS != mOnMS ||offMS != mOffMS || mBrightnessMode != brightnessMode) {if (DEBUG) Slog.v(TAG, "setLight #" + mId + ": color=#"+ Integer.toHexString(color) + ": brightnessMode=" + brightnessMode);mInitialized = true;mLastColor = mColor;mColor = color;mMode = mode;mOnMS = onMS;mOffMS = offMS;mBrightnessMode = brightnessMode;Trace.traceBegin(Trace.TRACE_TAG_POWER, "setLight(" + mId + ", 0x"+ Integer.toHexString(color) + ")");try {setLight_native(mId, color, mode, onMS, offMS, brightnessMode);} finally {Trace.traceEnd(Trace.TRACE_TAG_POWER);}}}

再往下就是灯的hal层和三色灯(多数pmic有集成)驱动了。

还有一个就是关机充电的指示灯，充电红灯，充满点绿灯，该部分代码在一个可执行程序中。

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