On a clean installation of Eclipse and the Android Development Tools (ADT), and for a new Android project, when trying to edit the strings.xml file, a java.lang.NullPointerException is thrown.
To fix the problem, edit strings.xml directly, bypassing the GUI, by double clicking the file in the Eclipse workbench, then selecting strings.xml from the tab at the bottom. Then, replace the line that reads:
<resources>
with
<resources xmlns:android="http://schemas.android.com/apk/res/android">
felipe-alfaro.com 
First off, thank you for the tip! I got tired of trying to type a single letter and then acknowledge the error.
Secondly, how and why does this work and will I need to do this with every project that I create?
This was very helpful, thank you! May I second Chris Stahl’s question and ask how this fixed the problem?
Thank you!
How did you find out about this though?
Had the same issue before and I found the fix because I had a sample project that the error didnt happen to and noticed that xmlns attribute. Im guessing the poster noticed it the same way.
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.
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