I am copying below a previous message that seems to solve this problem
w/o a full reinstall of the old ver. ( if that's your only problem) -
I am using Helios and it's fine.

{{{---------- Forwarded message ----------
From: Nitin Dahyabhai <nitin.dahyab...@gmail.com>
Date: Jul 9, 2:10 pm
Subject: java.lang.NullPointerException when trying to edit
strings.xml
To: Android Developers


On Jul 2, 5:16 pm, Xavier Ducrohet <x...@android.com> wrote:

> Hello all,

> We've tracked down this issue to a bug in the Eclipse Web tools
> plug-ins which provide the XML models and editors that our plug-ins
> use.

> For reference, Eclipse already has a bug filed for 
> this:https://bugs.eclipse.org/bugs/show_bug.cgi?id=318108

> We will implement a work around as soon as possible.

Until then, go to the XML/XML Files/Editor preference page and turn
off the "Use inferred grammar..." setting.  It should only affect
content assist and possibly some of the Outline view and Design page's
context menu actions.  Or refer to a DTD or XML Schema in the XML
file.  We'll have this corrected in Helios SR1/WTP 3.2.2.

---
Nitin Dahyabhai
Eclipse WTP Source Editing and JSDT
IBM Rational}}}

Hope that helps


On Jul 22, 10:50 am, Doug Gordon <gordo...@gmail.com> wrote:
> Just getting into Android devel, I downloaded and installed the latest
> Eclipse, which is 3.6 (Helios). Now I see that it's recommended to stay
> with 3.5 due to some XML-editing bugs with the ADT or something like that.
>
> So if I want to "revert" to 3.5, in addition to first uninstalling
> Eclipse 3.6, do I have to explicitly uninstall the ADT plug-in? And what
> about the Android SDK -- uninstall (or just delete) that also? I would
> guess it would be cleaner to install the whole tool chain from the top,
> but is that all necessary?
>
>   Doug Gordon
>   GHCS Systems

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