Android系统屏幕亮度调节Brightness

屏幕亮度Brightness

源码部分

设置-显示-亮度百分比

packages\apps\Settings\src\com\android\settings\display\BrightnessLevelPreferenceController.javaprivate void updatedSummary(Preference preference) {if (preference != null) {preference.setSummary(NumberFormat.getPercentInstance().format(getCurrentBrightness()));}
}private double getCurrentBrightness() {final int value;if (isInVrMode()) {value = convertLinearToGamma(System.getInt(mContentResolver,System.SCREEN_BRIGHTNESS_FOR_VR, mMaxBrightness),mMinVrBrightness, mMaxVrBrightness);} else {value = convertLinearToGamma(Settings.System.getInt(mContentResolver,System.SCREEN_BRIGHTNESS, mMinBrightness),mMinBrightness, mMaxBrightness);}return getPercentage(value, 0, GAMMA_SPACE_MAX);
}private double getPercentage(double value, int min, int max) {if (value > max) {return 1.0;}if (value < min) {return 0.0;}return (value - min) / (max - min);
}

convertLinearToGamma()非线性计算转化

frameworks\base\packages\SettingsLib\src\com\android\settingslib\display\BrightnessUtils.javapublic static final int convertLinearToGamma(int val, int min, int max) {// For some reason, HLG normalizes to the range [0, 12] rather than [0, 1]final float normalizedVal = MathUtils.norm(min, max, val) * 12;final float ret;if (normalizedVal <= 1f) {ret = MathUtils.sqrt(normalizedVal) * R;} else {ret = A * MathUtils.log(normalizedVal - B) + C;}return Math.round(MathUtils.lerp(0, GAMMA_SPACE_MAX, ret));
}

BrightnessDialog及其控制

# BrightnessDialog
frameworks\base\packages\SystemUI\src\com\android\systemui\settings\BrightnessDialog.javafinal ImageView icon = findViewById(R.id.brightness_icon);
final ToggleSliderView slider = findViewById(R.id.brightness_slider);
mBrightnessController = new BrightnessController(this, icon, slider);

# BrightnessDialog控制
frameworks\base\packages\SystemUI\src\com\android\systemui\settings\BrightnessController.java@Override
public void onChanged(ToggleSlider toggleSlider, boolean tracking, boolean automatic,int value, boolean stopTracking) {updateIcon(mAutomatic);if (mExternalChange) return;if (mSliderAnimator != null) {mSliderAnimator.cancel();}final int min;final int max;final int metric;final String setting;if (mIsVrModeEnabled) {metric = MetricsEvent.ACTION_BRIGHTNESS_FOR_VR;min = mMinimumBacklightForVr;max = mMaximumBacklightForVr;setting = Settings.System.SCREEN_BRIGHTNESS_FOR_VR;} else {metric = mAutomatic? MetricsEvent.ACTION_BRIGHTNESS_AUTO: MetricsEvent.ACTION_BRIGHTNESS;min = mMinimumBacklight;max = mMaximumBacklight;setting = Settings.System.SCREEN_BRIGHTNESS;}final int val = convertGammaToLinear(value, min, max);if (stopTracking) {MetricsLogger.action(mContext, metric, val);}setBrightness(val);if (!tracking) {AsyncTask.execute(new Runnable() {public void run() {Settings.System.putIntForUser(mContext.getContentResolver(),setting, val, UserHandle.USER_CURRENT);}});}for (BrightnessStateChangeCallback cb : mChangeCallbacks) {cb.onBrightnessLevelChanged();}
}

private void updateSlider(int val, boolean inVrMode) {final int min;final int max;if (inVrMode) {min = mMinimumBacklightForVr;max = mMaximumBacklightForVr;} else {min = mMinimumBacklight;max = mMaximumBacklight;}if (val == convertGammaToLinear(mControl.getValue(), min, max)) {// If we have more resolution on the slider than we do in the actual setting, then// multiple slider positions will map to the same setting value. Thus, if we see a// setting value here that maps to the current slider position, we don't bother to// calculate the new slider position since it may differ and look like a brightness// change to the user even though it isn't one.return;}final int sliderVal = convertLinearToGamma(val, min, max);animateSliderTo(sliderVal);
}

亮度参数配置

默认亮度、自动亮度开关

frameworks\base\packages\SettingsProvider\res\values\defaults.xml<!-- Default screen brightness, from 0 to 255.  102 is 40%. -->
<integer name="def_screen_brightness">102</integer>
<bool name="def_screen_brightness_automatic_mode">false</bool>

最大亮度、最小亮度

frameworks\base\core\res\res\values\config.xml<!-- Minimum screen brightness setting allowed by the power manager.The user is forbidden from setting the brightness below this level. -->
<integer name="config_screenBrightnessSettingMinimum">10</integer><!-- Maximum screen brightness allowed by the power manager.The user is forbidden from setting the brightness above this level. -->
<integer name="config_screenBrightnessSettingMaximum">255</integer><!-- Default screen brightness setting.Must be in the range specified by minimum and maximum. -->
<integer name="config_screenBrightnessSettingDefault">102</integer>

adb命令控制亮度

查看亮度值

adb shell
$ cd /sys/class/leds/lcd-backlight
$ ls
$ brightness device max_brightness power subsystem trigger uevent
$ cat brightness

# 获取亮度是否为自动获取
C:\Users\Administrator>adb shell settings get system screen_brightness_mode
1
# 获取当前亮度值
C:\Users\Administrator>adb shell settings get system screen_brightness
30
# 更改亮度值（亮度值在0—255之间整数）
C:\Users\Administrator>adb shell settings put system screen_brightness 150

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Android系统屏幕亮度调节Brightness

源码部分

亮度参数配置

adb命令控制亮度

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