Android XML layout Error

When I used the switch control in Android today, I found a problem that I couldn't get the desired display effect after running it on some machines.

Run graphical layout of eclipse later. The following error is displayed: Missing styles. Is the correct theme chosen for this layout?
Use the theme combo box above the layout to choose a different layout, or fix the theme style references.

Solution: in the upper-right corner of graphical, there is a drop-down button to select theme and select one of holo.

Cause: Because the switch control uses the holo topic, you must add one of the holo topics.