Android Studio disable line wrap

In Android Studio 0.4.0 following should help:

Configure > Settings > Editor > Uncheck 'Use soft wraps in editor'

Screenshot from Android Studio 0.4.0 Settings screen

On Mac (Android Studio 3.0):

Preferences -> Editor -> General -> Uncheck 'Use soft wraps in editor'

It's also available under the context menu enter image description here

Related