When a view root adopts a view, it becomes the owner of the view and any view hierarchy under it. The adopted view hierarchy appears on the display device associated with the view root. (This is a simplified explanation. Actually, the adopted view is initially marked "invalid" and the View System eventually requests that it refresh itself. See "Drawing by invalidation" on page 83 for details.)
When the view root orphans the view (or when the view root itself is deleted), the view and any hierarchy under it disappear from the display device. Figure 20 and Figure 21
illustrate the relationship between a view hierarchy, a view root, and a display device.
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