I think "soft wrap" might be what you need. It is read-only, i.e. It does not change the characters in the file, it only wraps what you see on the screen.
Intellij> = 14.1.4: As indicated by the looper in the comments, the parameters are under File> Settings> Editor> General - in the Virtual Space subgroup.
Intellij <14.1.4: Look under File> Settings> Editor> Virtual Space . It does not have a default shortcut, but it can be assigned in a layout.
AndroidStudio> = 1.4.1: the options are under File> Settings> Editor> General - under the Softcover subgroup.
You can also right-click on the gutter (the vertical bar where the line number is shown), and select "Use soft wrappers" - thanks Bajal for the comment. 
Shorn Apr 14 '14 at 23:34 2014-04-14 23:34
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