我是 libgdx 的新手。刚尝试运行libgdx示例我收到奇怪的错误，它说：
[2013-03-22 12:08:35 - ObjLoaderUsingLibGdx] Dx 1 error; aborting
[2013-03-22 12:08:35 - ObjLoaderUsingLibGdx] Conversion to Dalvik format failed with error 1
[2013-03-22 12:10:59 - ObjLoaderUsingLibGdx] Dx
trouble processing "java/io/BufferedInputStream.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.
我不知道我按照本教程入门的问题是什么。有人可以指出这个错误是怎么回事。这个错误的根源是什么我无法理解按照那里的所有步骤导入所有lib并构建路径