系统Hide Status Bar
frameworks/base/core/res/res/values/dimens.xml
把 <dimen name="status_bar_height">25dip</dimen> 修改为<dimen name="status_bar_height">0dip</dimen>
系统Hide Navigation Bar
frameworks/base/core/res/res/values/dimens.xml
把 <dimen name="status_bar_height">25dip</dimen> 修改为<dimen name="status_bar_height">0dip</dimen>