内置的照片库隐藏了屏幕底部的软键（后退、主页等）、时钟和通知区域，但我自己似乎无法在Android 3.1中隐藏它们，即使有：
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
这可能吗？
使用此：http://developer.android.com/reference/android/view/View.html#setSystemUiVisibility（int）
使用这些常量：http://developer.android.com/reference/android/view/View.html#STATUS_BAR_HIDDEN
使用此功能时，如果您自己的UI也随之发生更改（如书本中发生的情况），您将希望使用此功能来驱动这些更改，以便与状态栏保持同步：http://developer.android.com/reference/android/view/View.OnSystemUiVisibilityChangeListener.html
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