手动调解
在settings /systemUI中调节,settings 中调节也是调用SystemUI中的dialog 框
framework/base/packages/SystemUI/src/com/android/systemui/settings/BrightnessController.java
./frameworks/base/core/java/android/hardware/display/DisplayManager.java
./frameworks/base/core/java/android/hardware/display/DisplayManagerGlobal.java
./frameworks/base/core/java/android/hardware/display/IDisplayManager.aidl
./frameworks/base/services/core/java/com/android/server/display/DisplayManagerService.java
./frameworks/base/services/core/java/com/android/server/display/DisplayPowerController.java
./frameworks/base/services/core/java/com/android/server/display/RampAnimator.java
./frameworks/base/services/core/java/com/android/server/display/DisplayPowerState.java
—PhotonicModulator.java 内部类
./frameworks/base/services/core/java/com/android/server/display/DisplayManagerService.java
./frameworks/base/services/core/java/com/android/server/d
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