2. 系统Hide Status Bar
frameworks/base/core/res/res/values/dimens.xml
把
3. 系统Hide Navigation Bar
frameworks/base/packages/SystemUI/src/com/android/systemui/
statusbar/phone/PhoneStatusBar.java
在start函数中注释掉 "addNavigationBar();"
4.在Android4.0及以后版本中，可通过以下方法隐藏NavigationBar
View decorView = getWindow().getDecorView();
// Hide both the navigation bar and the status bar.
// SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as
// a general rule, you should design your app to hide the status bar whenever you
// hide the navigation bar.
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(uiOptions);