安卓:“方向”和“屏幕布局”有什么区别?

有两个不同的常量具有相同的描述( https://developer.android.com/reference/android/R.attr.html#configChanges )

orientation  0x0080  The screen orientation has changed, that is the user has rotated the device. 
screenLayout  0x0100  The screen orientation has changed, that is the user has rotated the device.

许多资料建议具体说明:

android:configChanges="keyboardHidden|orientation"

但不应该是:

android:configChanges="keyboardHidden|orientation|screenLayout"