Would You Like to Turn your Android device into a secondary display for say Editing, well you can now, squint your eyes to a smaller screen….See Details.
@TatWza

The folks behind the app, iDisplay, have an Android version available, which is apparently compatible with all Android smartphones and tablets running Android 2.1 or later, and works in both portrait and landscape modes. It’s also compatible with both Windows and OS X, and it’ll set you back $4.99.
iOS has already had this!