省电模式下调节背光亮度后重启手机,背光亮度恢复默认。

问题描述: 省电模式下调节背光亮度后重启手机,背光亮度恢复默认。

分析过程:

正常的情况下是只要是进入省电模式都会用一个小于 1 的系数去乘以背景光亮度 screenBrightness ,这

样背景光亮度就会变暗,退出省电模式就会 reset 这个背景光的亮度。

此 bug 是因为在省电模式下重启并没有在 reset 后 set ,而是在 set 的基础上又 set 了一次,如果在省电模

式下反复重启,就会反复 set ,导致屏幕越来越暗。

解决方案:

加一个标记,标记是在省电模式下重启,如果是在省电模式下重启就不用再 set.

diff --git a/services/core/java/com/android/server/power/PowerSaveModeController.javab/services/core/java/com/android/server/power/PowerSaveModeController.java

index b3b7275..7082f01 100644

--- a/services/core/java/com/android/server/power/PowerSaveModeController.java

+++ b/services/core/java/com/android/server/power/PowerSaveModeController.java

@@ -345,10 +345,17 @@ public class PowerSaveModeController extends BroadcastReceiver {

saveConfig(LAST_SCREEN_BRIGHTNESS_MODEL, screenMode);

saveConfig(LAST_SCREEN_BRIGHTNESS, screenBrightness);

-

- int brightness = screenBrightness

+ int brightness;

+ if (SystemProperties.getBoolean("persist.sys.power.save",false)) {

+

brightness = screenBrightness;

+

} else {

+

brightness = screenBrightness

* (getMaxScreenLightPowerSave() - getMinScreenLight())

/ (DEFAULT_MAX_SCREEN_BRIGHTNESS - getMinScreenLight());

+ } + //int brightness = screenBrightness

+ // * (getMaxScreenLightPowerSave() - getMinScreenLight())

+ // / (DEFAULT_MAX_SCREEN_BRIGHTNESS - getMinScreenLight());

if (DEBUG_VALUE)

Log.d(LOG_TAG, "setScreenLight - CurrentscreenMode is " + screenMode

@@ -359,9 +366,11 @@ public class PowerSaveModeController extends BroadcastReceiver {

DEFAULT_SCREEN_BRIGHTNESS_MODE);

Settings.System.putInt(mContext.getContentResolver(),

Settings.System.SCREEN_BRIGHTNESS,

brightness);

+

SystemProperties.set("persist.sys.power.save","true");

}private void resetScreenLight() {

+

SystemProperties.set("persist.sys.power.save","false");

if (DEBUG_PROCESS)

Log.d(LOG_TAG, "resetScreenLight");