涉及systemUI和settings模块
packages/apps/Settings/res/layout/battery_header.xml
android:visibility="invisible"添加属性不可见
frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/KeyguardIndicationController.java
packages/apps/Settings/src/com/android/settings/fuelgauge/TopLevelBatteryPreferenceController.java
return返回null
