Analysis of attributes in Android: visibility 3 in Android

In Android, the visibility of controls or layout Android: visibility is 3, for example, view. Visible, view. unvisible, and view. Gone.

View. Visible is obviously visible, but it occupies space. That is to say, if the Android: visibility of the control

If it is set to view. unvisible, although the control is hidden, it still occupies the position of its layout on the screen, which is different from the meaning in C. While view. Gone

This control is invisible and does not occupy space in the system layout.