[转载]android开发小技巧2（Dx 1 error; aborting）
工程上有红叉，不知道少了什么，但是袋中却没有任何错误，运行程序报错为：
trouble processing "javax/xml/datatype/DatatypeConstants$Field.class":
Ill-advised or mistaken usage of a
core class (java.* or javax.*)
when not building a core
library.
This is often due to inadvertently
including a core library file
in your application's project, when
using an IDE (such as
Eclipse). If you are sure you're not
intentionally defining a
core class, then this is the most
likely explanation of what's
going on.
However, you might actually be trying
to define a class in a core
namespace, the source of which you may
have taken, for example,
from a non-Android virtual machine
project. This will most
assuredly not work. At a minimum, it
jeopardizes the
compatibility of your app with future
versions of the platform.
It is also often of questionable
legality.
If you really intend to build a core
library -- which is only
appropriate as part of creating a full
virtual machine
distribution, as opposed to compiling
an application -- then use
the "--core-library" option to
suppress this error message.
If you go ahead and use
"--core-library" but are in fact
building an application, then be
forewarned that your application
will still fail to build or run, at
some point. Please be
prepared for angry customers who find,
for example, that your
application ceases to function once
they upgrade their operating
system. You will be to blame for this
problem.
If you are legitimately using some
code that happens to be in a
core package, then the easiest safe
alternative you have is to
repackage that code. That is, move the
classes in question into
your own package namespace. This means
that they will never be in
conflict with core system classes.
JarJar is a tool that may help
you in this endeavor. If you find that
you cannot do this, then
that is an indication that the path
you are on will ultimately
lead to pain, suffering, grief, and
lamentation.
控制台：
[2011-07-29 11:02:55 - GalleryView] Dx 1 error; aborting
[2011-07-29 11:02:55 - GalleryView] Conversion to Dalvik format
failed with error 1
其实这个错误很简单，你的jar包在工程里面不止一个，所以删除其他，留一个jar包即可，然后重新运行工程。
