修改系统设置默认值：platform/frameworks/base/packages/SettingsProvider/res/values/defaults.xml，将其中的：

false

false

这两项的值都改为 true：

true

true

修改 platform/frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java 中

private void updateStayOnLocked(int dirty) {

if ((dirty & (DIRTY_BATTERY_STATE | DIRTY_SETTINGS)) != 0) {

final boolean wasStayOn = mStayOn;

if (mStayOnWhilePluggedInSetting != 0

&& !isMaximumScreenOffTimeoutFromDeviceAdminEnforcedLocked()) {

mStayOn = mBatteryManagerInternal.isPowered(mStayOnWhilePluggedInSetting);

} else {

mStayOn = false;

}

if (mStayOn != wasStayOn) {

mDirty |= DIRTY_STAY_ON;

}

}

}

改为：

private void updateStayOnLocked(int dirty) {

if ((dirty & (DIRTY_BATTERY_STATE | DIRTY_SETTINGS)) != 0) {

final boolean wasStayOn = mStayOn;

if (mStayOnWhilePluggedInSetting != 0

&& !isMaximumScreenOffTimeoutFromDeviceAdminEnforcedLocked()) {

mStayOn = mBatteryManagerInternal.isPowered(mStayOnWhilePluggedInSetting);

} else {

mStayOn = false;

}

mStayOn = true;

if (mStayOn != wasStayOn) {

mDirty |= DIRTY_STAY_ON;

}

}

}