Android-Studio to show XML code instead of design

Newer (I guess 2.x+) versions of Android Studio have this option in the main settings:

Open the settings with one of the following actions:

• Press Ctrl+Alt+S.
• On the main menu, choose File | Settings for Windows and Linux or IntelliJ IDEA | Preferences for OS X
• Press Ctrl+Shift+A, type settings and press Enter.

Then navigate to the following sub-menu:

Editor -> Layout Editor -> "Prefer XML editor"

This has been added in the newest release of Android Studio (0.8.12).

Other features of the new release can be found here.