This lesson describes how to hide the navigation bar, which was introduced in Android 4.0 (API level 14).
Even though this lesson focuses on hiding the navigation bar, you should design your app to hide the status bar at the same time, as described in Hiding the Status Bar. Hiding the navigation and status bars (while still keeping them readily accessible) lets the content use the entire display space, thereby providing a more immersive user experience.
You can hide the navigation bar using the
SYSTEM_UI_FLAG_HIDE_NAVIGATION flag. This snippet hides both
the navigation bar and the status bar:
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);
Note the following:
onCreate()method and the user presses Home, the system bars will reappear. When the user reopens the activity,
onCreate()won't get called, so the system bars will remain visible. If you want system UI changes to persist as the user navigates in and out of your activity, set UI flags in
setSystemUiVisibility()only has an effect if the view you call it from is visible.
setSystemUiVisibility()to be cleared.
On Android 4.1 and higher, you can set your application's content to appear behind
the navigation bar, so that the content doesn't resize as the navigation bar hides and
shows. To do this, use
You may also need to use
SYSTEM_UI_FLAG_LAYOUT_STABLE to help your app maintain a
When you use this approach, it becomes your responsibility to ensure that critical parts of your app's UI don't end up getting covered by system bars. For more discussion of this topic, see the Hiding the Status Bar lesson.