Android studio automatically open's documentation view

I don't know if it is bug or kind of setting, but it is very annoying while typing value i.e. android:layout_gravity="", it opens hints with dropdown, and after a while the documentation view gets opened and hides the dropdown with hints.

I checked that no button is suspended or anything like that. I use Ubuntu 14.04.

Strange, because I've not changed anything with AS from months and there was no such behavior before. There's solution:

Follow the simple steps to remove open Documentation by cursor move :

Android Studio -> File -> Setting -> Editor -> General

Right side of the screen go to Others :

• Uncheck checkBox show quick documentation of mouse move & Apply.

Preferences > Editor > General > CodeCompletion > uncheck Auto popup feature

Note that this functionality has been moved recently. It's now in:

Android Studio -> Preferences -> Editor -> General -> Other.

Uncheck "quick documentation on mouse move".