SDK is not loaded yet解决方法

 部分网友可能会发现，更新了Android 1.5 SDK可能出现，Unknown error: SDK is not loaded yet的提示信息，同时还会有如下

trouble processing "java/awt/font/NumericShaper.class":

Attempt to include a core VM class in something other than a core library.It is likely that you have attempted to include the core library from a desktop virtual machine into an application, which will most assuredly not work. If you really intend to build a core library -- which is only appropriate as part of creating a full virtual machine binary, 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 please be aware that your build will still fail at some point; you will simply be denied the pleasure of reading this helpful error message.

  类似的还可能有 1 error; aborting 以及  Conversion to Dalvik format failed with error 1的错误信息，目前原因在在于引用的JAR Library存在问题，从Android 1.5开始发现Google每次更新SDK时各种问题接种而来，可以尝试下面的方法解决:

  创建一个空的工程类似Hello World，然后在该Project的根目录下面找到 .classpath 文件，覆盖到存在该错误的项目中，.classpath的完整内容为:

  <?xml version="1.0" encoding="UTF-8"?>
<classpath>
 <classpathentry kind="src" path="src"/>
 <classpathentry kind="src" path="gen"/>
 <classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
 <classpathentry kind="output" path="bin"/>
</classpath>